CN106026641A - Step-down DC conversion circuit, transformer and conversion method - Google Patents
Step-down DC conversion circuit, transformer and conversion method Download PDFInfo
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- CN106026641A CN106026641A CN201610493499.3A CN201610493499A CN106026641A CN 106026641 A CN106026641 A CN 106026641A CN 201610493499 A CN201610493499 A CN 201610493499A CN 106026641 A CN106026641 A CN 106026641A
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- electric capacity
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- inductance
- afterflow
- energy storage
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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
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The invention provides a step-down DC conversion circuit, a transformer and a conversion method. The step-down DC conversion circuit comprises an energy storage and free-wheeling unit which is used for performing energy storage and free-wheeling on input voltage; a power supply unit which supplies power to an external load through storage energy; a charging unit which is used for charging the energy storage and free-wheeling unit and the power supply unit so that the energy storage and free-wheeling unit and the power supply unit are enabled to store energy; and a free-wheeling unit which is used for enabling the energy storage and free-wheeling unit to perform free-wheeling on the charging unit and stopping charging the power supply unit when the energy storage and free-wheeling unit performs free-wheeling so as to reduce output voltage for power supply to the external load. A filter inductor performs free-wheeling on the input power supply rather than perform free-wheeling on an output end electrolytic capacitor so that output DC voltage is lower under the same high duty cycle, and the step-down DC conversion circuit is suitable for the application occasion of a high-voltage input-low-voltage output step-down DC-DC converter.
Description
Technical field
The present invention relates to Technics of Power Electronic Conversion technical field, particularly relate to DC transfer circuit technical field, be specially one fall
Die mould DC transfer circuit, transformator and alternative approach.
Background technology
For traditional buck DC-DC converter, only one power device being operated on off state.When power device touches
When sending out conducting, input power is that filter inductance charging is powered with electrochemical capacitor, and electrochemical capacitor is load supplying simultaneously.Work as power device
When part does not triggers shutoff, the sense up voltage of filter inductance is powered for electrochemical capacitor together with input voltage, filter inductance afterflow, with
Time electrochemical capacitor be load supplying.According to this circuit topology and modulation strategy, when electric current continuous conduction mode, output voltage
With input voltage ratio equal to dutycycle.When the output voltage is low, dutycycle is relatively low.Now power device there will be conducting
Imperfect situation, has just turned on and has just turned off so that power device heating is heavier, reduces the service life of power device.
The application scenario of high input voltage-low-voltage output includes underground engines working power and various distributed power source.In order to adapt to
The application of high input voltage-low-voltage output, needs to improve traditional buck DC-DC converter topological sum modulation algorithm.Typically
For, circuit topology changes the change meaning modulation algorithm.Through the buck DC-DC of high input voltage-low pressure output is become
Exchanger art prior art and the retrieval of correlation technique, find mainly there is following representative document:
Tian Guotao. the research of the PWM Square-type inverter power supply of wide-range voltage output can be realized. South China Science & Engineering University, Shuo Shixue
Degree thesis whole-length, 2004；Wu Jian. the research of plasma cutting high-performance electric origin system. Nanjing Aero-Space University, master's degree opinion
Literary composition, 2010.The former proposes the PWM Square-type transformation topology of a kind of wide-range voltage output, and the latter proposes a kind of employing and drops
Pressure transformer and the electric source topology of single-stage BUCK DC-DC converter.Prior art to buck DC-DC converter field
And find after correlation technique analysis, compare shortage and adapt to high input voltage-low pressure output DC-DC converter topology.Current stage
Need to release and adapt to high input voltage-low pressure output DC-DC converter topology, and simple in construction, multiple functional and with low cost.
Summary of the invention
The shortcoming of prior art in view of the above, it is an object of the invention to provide a kind of step-down type dc translation circuit, transformation
Device and alternative approach, be used for solving DC transfer circuit of the prior art and lack high input voltage, low pressure output problem.
For achieving the above object, the present invention provides a kind of step-down type dc translation circuit, and described step-down type dc translation circuit includes:
Energy storage afterflow unit, for carrying out energy storage and afterflow to input voltage；Power supply unit, is connected with described energy storage afterflow unit, logical
Crossing energy storage is that external loading is powered；Charhing unit, respectively with input power, described energy storage afterflow unit and said supply unit
It is connected, for described energy storage afterflow unit and said supply unit be charged so that described energy storage afterflow unit and described power supply
Unit carries out energy storage；Afterflow unit, is used for making described energy storage afterflow unit carry out afterflow and in described energy storage to described charhing unit
Stop when afterflow unit carries out afterflow charging for power supply unit to be reduced to the output voltage that described external loading is powered.
In one embodiment of the invention, described energy storage afterflow unit includes inductance；Said supply unit includes the first electric capacity.
In one embodiment of the invention, described charhing unit includes the first field-effect transistor, the second field-effect transistor, the second electricity
Hold and the 3rd electric capacity；Described second electric capacity is connected with input power after described 3rd capacitances in series, wherein, and described second electric capacity
Negative pole be connected with the positive pole of described 3rd electric capacity；The negative pole of described 3rd electric capacity forms input cathode；Described second electric capacity
Positive pole is connected with the source electrode of described first field-effect transistor and forms input anode, and the positive pole of the most described second electric capacity is with described
First end of inductance is connected；The positive pole of described 3rd electric capacity and the drain electrode of described first field effect transistor and the second end of described inductance
It is connected；First end of described inductance also source electrode with described second field-effect transistor is connected；The drain electrode of described second field-effect transistor
It is connected with the positive pole of described first electric capacity and forms output head anode；The negative pole of described first electric capacity forms negative pole of output end.
In one embodiment of the invention, described charhing unit charging time, described second effect of described first field-effect transistor
Transistor is conducting state；Voltage after described second electric capacity and the 3rd capacitances in series superposition puts on the first end of described inductance
Positive pole with described first electric capacity；The voltage of described 3rd electric capacity puts on the second end of described inductance；Described inductance and described
One electric capacity charging energy-storing, the induced potential direction of described inductance is that the second end is to the first end.
In one embodiment of the invention, described afterflow unit includes the first diode, the second diode, described first effect crystalline substance
Body pipe, described second field-effect transistor and described second electric capacity；Described first diode is connected to the positive pole of described second electric capacity
And on the circuit between the first end of described inductance；Described second diode is connected to the positive pole of described 3rd electric capacity and described inductance
The second end between circuit on.
In one embodiment of the invention, described afterflow unit when afterflow, described second effect of described first field-effect transistor
Transistor is off state；The free wheeling path of described continuous electric unit is: electric current by the first end of described inductance successively through described
One diode stream, described second electric capacity, described second diode flows back to the second end of described inductance.
In one embodiment of the invention, described inductance is filter inductance.
In one embodiment of the invention, described first electric capacity, described second electric capacity and described 3rd electric capacity are electrochemical capacitor.
In one embodiment of the invention, described first field-effect transistor and described second one two pole of the equal inverse parallel of field-effect transistor
Pipe.
For achieving the above object, the present invention also provides for a kind of step-down type dc changer, described step-down type dc changer include as
Upper described step-down type dc translation circuit.
For achieving the above object, the present invention also provides for a kind of step-down type dc alternative approach, is applied to include inductance, electric capacity, fills
The step-down type dc translation circuit of electric unit and afterflow unit, described step-down type dc alternative approach includes: single by described charging
Described inductance and described electric capacity are charged by unit so that described inductance and described electric capacity carry out energy storage, reduce output voltage, and by
Described electric capacity is that external loading is powered by energy storage；By afterflow unit make described inductance to described charhing unit carry out afterflow and
Described inductance carries out stopping during afterflow charging for described first electric capacity to be reduced to the output voltage that described external loading is powered.
As it has been described above, a kind of step-down type dc translation circuit, transformator and the alternative approach of the present invention, there is following useful effect
Really:
1, in the present invention, filter inductance is to input power afterflow rather than to outfan electrochemical capacitor afterflow, during same high duty ratio,
Output DC voltage is lower, is suitable for the buck DC-DC converter application scenario of high input voltage-low pressure output.
2, the present invention is capable of from input to outfan decompression transformation, can be anti-with degree of depth blood pressure lowering in the case of dutycycle is relatively big
When only output voltage is relatively low, dutycycle is too small causes invalid driving and the excessive problem of switching loss.
3, the function of each components and parts of the abundant multiplexing of the present invention, has circuit structure simple, uses number of devices few, controls easily,
The lower-cost advantage of power circuit.
Accompanying drawing explanation
Fig. 1 is shown as the theory diagram of the step-down type dc translation circuit of the present invention.
Fig. 2 is shown as the structural representation of the step-down type dc translation circuit of the present invention.
Element numbers explanation
100 step-down type dc translation circuits
101 energy storage afterflow unit
102 power supply units
103 charhing units
104 afterflow unit
Detailed description of the invention
Below by way of specific instantiation, embodiments of the present invention being described, those skilled in the art can be by disclosed by this specification
Content understand other advantages and effect of the present invention easily.The present invention can also be added by the most different detailed description of the invention
To implement or application, the every details in this specification can also be based on different viewpoints and application, in the essence without departing from the present invention
Various modification or change is carried out under god.
The purpose of the present embodiment is to provide a kind of step-down type dc translation circuit, transformator and alternative approach, is used for solving
Certainly DC transfer circuit of the prior art lacks high input voltage, low pressure output problem.The present embodiment described in detail below
A kind of step-down type dc translation circuit, transformator and the principle of alternative approach and embodiment, make those skilled in the art not
Creative work is needed i.e. to be appreciated that a kind of step-down type dc translation circuit, transformator and the alternative approach of the present embodiment.
The present embodiment provides a kind of step-down type dc translation circuit, and a kind of filter inductance energy storage is to the voltage-dropping type of power supply afterflow
DC-DC conversion circuit, for be from left to right buck single to DC-DC conversion circuit, among a switch periods, exist
Charging process and afterflow process, can be applicable to be distributed DC generation field.Specifically, as it is shown in figure 1, described step-down type dc
Translation circuit 100 includes: energy storage afterflow unit 101, power supply unit 102, charhing unit 103 and afterflow unit 104.In
In the present embodiment, described energy storage afterflow unit 101 is for carrying out energy storage and afterflow to input voltage.Wherein, described energy storage afterflow
Unit 101 is filter inductance.Said supply unit 102 is connected with described energy storage afterflow unit 101, is outside negative by energy storage
Carry power supply.Charhing unit 103 is in order to complete from input to outfan the charging process (to output capacitor), afterflow unit
104 in order to complete the afterflow process of energy storage afterflow unit 101, and when power device does not works, output end voltage is less than input
Voltage.
In the present embodiment, described charhing unit 103 respectively with input power (such as input voltage 400V, output voltage 24V,
Specified transform power is 2.5kW), described energy storage afterflow unit 101 and said supply unit 102 are connected, for described
Energy storage afterflow unit 101 and said supply unit 102 are charged so that described energy storage afterflow unit 101 and said supply unit
102 carry out energy storage.
As in figure 2 it is shown, in the present embodiment, described energy storage afterflow unit 101 includes inductance L1；Said supply unit 102 is wrapped
Include the first electric capacity E1.Described charhing unit 103 includes the first field-effect transistor S1, the second field-effect transistor S2, the second electric capacity
E2 and the 3rd electric capacity E3.Described first field-effect transistor S1 and described second one diode of the equal inverse parallel of field-effect transistor S2.
Described first field-effect transistor S1 anti-paralleled diode FWD1, described second field-effect transistor S2 anti-paralleled diode FWD2.
Specifically, with input power (U after described second electric capacity E2 and described 3rd electric capacity E3 connects0+U1) be connected, wherein,
The negative pole of described second electric capacity E2 is connected with the positive pole of described 3rd electric capacity E3；The negative pole of described 3rd electric capacity E3 forms input
End negative pole N1；The positive pole of described second electric capacity E2 is connected with the source electrode of described first field-effect transistor S1 and forms input anode
P1, the positive pole of the most described second electric capacity E2 is connected with first end of described inductance L1；The positive pole of described 3rd electric capacity E3 with
The drain electrode of described first field effect transistor S1 and second end of described inductance L1 are connected；First end of described inductance L1 also with institute
The source electrode stating the second field-effect transistor S2 is connected；The drain electrode of described second field-effect transistor S2 is with described first electric capacity E1 just
Extremely it is connected and forms output head anode P2；The negative pole of described first electric capacity E1 forms negative pole of output end N2.
Wherein, in the present embodiment, described first electric capacity E1, described second electric capacity E2 and described 3rd electric capacity E3 are electricity
Solve electric capacity.
In one embodiment of the invention, described charhing unit 103 when charging, described the of described first field-effect transistor S1
Two field-effect transistor S2 are conducting state；Voltage after described second electric capacity E2 and the 3rd electric capacity E3 overlapped in series puts on
First end of described inductance L1 and the positive pole of described first electric capacity E1；The voltage of described 3rd electric capacity E3 puts on described inductance
Second end of L1；Described inductance L1 and described first electric capacity E1 charging energy-storing, the induced potential direction of described inductance L1 is
Two ends are to the first end.
Specifically, in described charhing unit 103, the first field-effect transistor S1 and the second field-effect transistor S2 triggers simultaneously and leads
Logical, after the terminal voltage overlapped in series of the second electric capacity E2 and the 3rd electric capacity E3, it is applied to filter inductance L1's as input voltage
First end, the terminal voltage of the 3rd electric capacity E3 is applied to the second end of filter inductance, now filtered electrical as output DC voltage simultaneously
Inducing current rises, and slope is (U0+U1-U2)/L, and U0+U1 is input voltage, and U2 is output voltage, the sense of filter inductance
Up voltage direction is left positive right negative, and wherein, L is the inductance value of filter inductance, and filter inductance stores energy, is the first electric capacity simultaneously
E1 charges, and is load supplying after the first electric capacity E1 charging.
In the present embodiment, described afterflow unit 104 be used for making described inductance L1 to described charhing unit 103 carry out afterflow and
The output electricity powered for described first electric capacity E1 charging is stopped being reduced to described external loading when described inductance L1 carries out afterflow
Pressure.
Specifically, as in figure 2 it is shown, in the present embodiment, described afterflow unit 104 includes the first diode D1, the two or two pole
Pipe D2, described first field-effect transistor S1, described second field-effect transistor S2 and described second electric capacity E2；Described first
Diode D1 is connected on the circuit between positive pole and first end of described inductance L1 of described second electric capacity E2；Described second
Diode D2 is connected on the circuit between positive pole and second end of described inductance L1 of described 3rd electric capacity E3.
In one embodiment of the invention, described afterflow unit 104 when afterflow, described the of described first field-effect transistor S1
Two field-effect transistor S2 are off state；Filter inductance enters freewheeling state, and electric current presents downward trend, feels up voltage direction
Just bearing the right side for a left side, the free wheeling path of described continuous electric unit is: electric current by first end of described inductance L1 successively through described one or two pole
Pipe D1 flows, and described second electric capacity E2, described second diode D2 flow back to second end of described inductance L1.
It can be seen that among a switch periods, only in charging process, the first electric capacity E1 for load supplying just obtains energy
Amount, energy is from input power.In afterflow process, the energy storage of filter inductance can be wholly or partially transferred to the second electric capacity E2, because of
This is it may be concluded that when identical dutycycle, the output voltage of the present embodiment is less than conventional buck DC-DC conversion circuit.
The present invention is capable of, from input to outfan decompression transformation, to prevent output with degree of depth blood pressure lowering in the case of dutycycle is relatively big
When voltage is relatively low, dutycycle is too small causes invalid driving and the excessive problem of switching loss.
In the present embodiment, parameter refers to choose as follows: filter inductance (L1): 500 μ H, plug-in unit, installs at plate；Electrolysis
Electric capacity (E1, E2): 450V, 2200 μ F, plug-in unit；Electrochemical capacitor (E3): 47V, 6800 μ F, plug-in unit；Power two
Pole pipe (D1, D2): 600V, 20A/100 DEG C, is less than 25ns reverse recovery time；Power MOSFET (S1 Yu FWD1,
S2 and FWD2): 500V, 20A/100 DEG C, it is less than 25ns recovery time.
The present embodiment also provides for a kind of step-down type dc changer, and described step-down type dc changer includes voltage-dropping type as above
DC transfer circuit 100.Above-mentioned described step-down type dc translation circuit 100 is described in detail, the most superfluous at this
State.
The present embodiment also provides for a kind of step-down type dc alternative approach, is applied to include inductance 101, electric capacity, charhing unit 103
With the above-mentioned step-down type dc translation circuit 100 of afterflow unit 104, described step-down type dc alternative approach comprises the steps:
Step S1, is charged so that described inductance 101 by described charhing unit 103 to described inductance 101 and described electric capacity
Carry out energy storage with described electric capacity, reduce output voltage, and be that external loading is powered by described electric capacity by energy storage.
Described charhing unit 103 includes the first field-effect transistor S1, the second field-effect transistor S2, the second electric capacity E2 and the 3rd electricity
Hold E3.Described first field-effect transistor S1 and described second one diode of the equal inverse parallel of field-effect transistor S2.
In described charhing unit 103, the first field-effect transistor S1 and the second field-effect transistor S2 triggering and conducting simultaneously, second
After the terminal voltage overlapped in series of electric capacity E2 and the 3rd electric capacity E3, it is applied to the first end of filter inductance 101 as input voltage,
The terminal voltage of the 3rd electric capacity E3 is applied to the second end of filter inductance as output DC voltage simultaneously, now on filter inductance electric current
Rising, slope is (U0+U1-U2)/L, and sense up voltage direction is left positive right negative, and wherein, L is the inductance value of filter inductance, filtering
Inductance stores energy, is the first electric capacity E1 charging simultaneously, and the first electric capacity E1 is charged as load supplying.
Step S2, makes described inductance 101 carry out afterflow and at described inductance to described charhing unit 103 by afterflow unit 104
101 carry out stopping during afterflow charging for described first electric capacity E1 to be reduced to the output voltage that described external loading is powered.
Described afterflow unit 104 includes the first diode D1, the second diode D2, and described first field-effect transistor S1 is described
Second field-effect transistor S2 and described second electric capacity E2；Described first diode D1 is connected to the sun of described second electric capacity E2
On circuit between pole and the first end of described inductance 101；Described second diode D2 is connected to the positive pole of described 3rd electric capacity
And on the circuit between the second end of described inductance 101.
In one embodiment of the invention, described afterflow unit 104 when afterflow, described the of described first field-effect transistor S1
Two field-effect transistor S2 are off state；Filter inductance enters freewheeling state, and electric current presents downward trend, feels up voltage direction
Just bearing the right side for a left side, the free wheeling path of described continuous electric unit is: electric current by the first end of described inductance 101 successively through the described 1st
Pole pipe D1 flows, and described second electric capacity E2, described second diode D2 flow back to the second end of described inductance 101.
It can be seen that among a switch periods, only in charging process, the first electric capacity E1 for load supplying just obtains energy
Amount, energy is from input power.In afterflow process, the energy storage of filter inductance can be wholly or partially transferred to the second electric capacity E2, because of
This is it may be concluded that when identical dutycycle, the output voltage of the present embodiment is less than conventional buck DC-DC conversion circuit.
In sum, in the present invention, filter inductance is to input power afterflow rather than to outfan electrochemical capacitor afterflow, the highest
During dutycycle, output DC voltage is lower, is suitable for the buck DC-DC converter application scenario of high input voltage-low pressure output；
The present invention is capable of, from input to outfan decompression transformation, to prevent output with degree of depth blood pressure lowering in the case of dutycycle is relatively big
When voltage is relatively low, dutycycle is too small causes invalid driving and the excessive problem of switching loss；The each components and parts of the abundant multiplexing of the present invention
Function, has circuit structure simple, uses number of devices few, controls easily, the lower-cost advantage of power circuit.So,
The present invention effectively overcomes various shortcoming of the prior art and has high industrial utilization.
The principle of above-described embodiment only illustrative present invention and effect thereof, not for limiting the present invention.Any it is familiar with this skill
Above-described embodiment all can be modified under the spirit and the scope of the present invention or change by the personage of art.Therefore, such as
All that in art, tool usually intellectual is completed under without departing from disclosed spirit and technological thought etc.
Effect is modified or changes, and must be contained by the claim of the present invention.
Claims (11)
1. a step-down type dc translation circuit, it is characterised in that: described step-down type dc translation circuit includes:
Energy storage afterflow unit, for carrying out energy storage and afterflow to input voltage；
Power supply unit, is connected with described energy storage afterflow unit, is that external loading is powered by energy storage；
Charhing unit, respectively with input power, described energy storage afterflow unit and said supply unit are connected, for described
Energy storage afterflow unit and said supply unit are charged so that described energy storage afterflow unit and said supply unit carry out energy storage；
Afterflow unit, is used for making described energy storage afterflow unit carry out afterflow and at described energy storage afterflow unit to described charhing unit
Stop when carrying out afterflow charging for power supply unit to be reduced to the output voltage that described external loading is powered.
Step-down type dc translation circuit the most according to claim 1, it is characterised in that: described energy storage afterflow unit includes inductance；
Said supply unit includes the first electric capacity.
Step-down type dc translation circuit the most according to claim 2, it is characterised in that: described charhing unit includes first effect crystalline substance
Body pipe, the second field-effect transistor, the second electric capacity and the 3rd electric capacity；With defeated after described second electric capacity and described 3rd capacitances in series
Entering power supply to be connected, wherein, the negative pole of described second electric capacity is connected with the positive pole of described 3rd electric capacity；Bearing of described 3rd electric capacity
Pole forms input cathode；The positive pole of described second electric capacity is connected with the source electrode of described first field-effect transistor and forms input
Positive pole, the positive pole of the most described second electric capacity is connected with the first end of described inductance；The positive pole of described 3rd electric capacity and described the
The drain electrode of one field effect transistor and the second end of described inductance are connected；First end of described inductance also imitates crystal with described second
The source electrode of pipe is connected；The drain electrode of described second field-effect transistor is connected with the positive pole of described first electric capacity and forms output and rectifies
Pole；The negative pole of described first electric capacity forms negative pole of output end.
Step-down type dc translation circuit the most according to claim 3, it is characterised in that: described charhing unit is when charging, described
Described second field-effect transistor of the first field-effect transistor is conducting state；Described second electric capacity and the 3rd capacitances in series superposition
After voltage put on the first end and the positive pole of described first electric capacity of described inductance；The voltage of described 3rd electric capacity puts on institute
State the second end of inductance；Described inductance and described first electric capacity charging energy-storing, the induced potential direction of described inductance is the second end
To the first end.
Step-down type dc translation circuit the most according to claim 3, it is characterised in that: described afterflow unit includes the first diode,
Second diode, described first field-effect transistor, described second field-effect transistor and described second electric capacity；Described first
Diode is connected on the circuit between positive pole and first end of described inductance of described second electric capacity；Described second diode is even
It is connected on the circuit between positive pole and second end of described inductance of described 3rd electric capacity.
Step-down type dc translation circuit the most according to claim 5, it is characterised in that: described afterflow unit is when afterflow, described
Described second field-effect transistor of the first field-effect transistor is off state；The free wheeling path of described continuous electric unit is: electric current
By the first end of described inductance successively through described first diode stream, described second electric capacity, described second diode flows back to described
Second end of inductance.
7. according to the step-down type dc translation circuit described in claim 2～6 any claim, it is characterised in that: described inductance is filter
Ripple inductance.
8. according to the step-down type dc translation circuit described in claim 3～6 any claim, it is characterised in that: described first electric capacity,
Described second electric capacity and described 3rd electric capacity are electrochemical capacitor.
9. according to the step-down type dc translation circuit described in claim 3～6 any claim, it is characterised in that: described first effect
Transistor and described second one diode of the equal inverse parallel of field-effect transistor.
10. a step-down type dc changer, it is characterised in that: described step-down type dc changer includes that claim 1 to right such as is wanted
Seek the step-down type dc translation circuit described in 9 any claim.
11. 1 kinds of step-down type dc alternative approachs, it is characterised in that: it is applied to include inductance, electric capacity, charhing unit and afterflow unit
Step-down type dc translation circuit, described step-down type dc alternative approach includes:
Described inductance and described electric capacity are charged so that described inductance and described electric capacity store up by described charhing unit
Can, reduce output voltage, and be that external loading is powered by described electric capacity by energy storage；
By afterflow unit make described inductance to described charhing unit carry out afterflow and when described inductance carries out afterflow stop be
Described first electric capacity charges to be reduced to the output voltage that described external loading is powered.
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| CN201610493499.3A CN106026641B (en) | 2016-06-29 | 2016-06-29 | A kind of step-down type dc translation circuit, transformer and transform method |
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| CN106026641B CN106026641B (en) | 2019-04-16 |
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| CN106026641B (en) | 2019-04-16 |
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Address after: Room 1101-163, 323 Guoding Road, Yangpu District, Shanghai 200433 Patentee after: Shanghai Rujing Intelligent Control Technology Co.,Ltd. Address before: Room 1101-163, 323 Guoding Road, Yangpu District, Shanghai 200433 Patentee before: RUKING EMERSON CLIMATE TECHNOLOGIES (SHANGHAI) Co.,Ltd. |