CN100380796C - Switching type power switching circuit and saturable transformer - Google Patents
Switching type power switching circuit and saturable transformer Download PDFInfo
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- CN100380796C CN100380796C CNB2003101181203A CN200310118120A CN100380796C CN 100380796 C CN100380796 C CN 100380796C CN B2003101181203 A CNB2003101181203 A CN B2003101181203A CN 200310118120 A CN200310118120 A CN 200310118120A CN 100380796 C CN100380796 C CN 100380796C
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Abstract
The present invention relates to a change-over power supply converting circuit. When electric power is changed over and supplied, the end-point potential is zero potential before a change-over switch is conducted by the saturation effect of a saturable reactor. The change-over power supply converting circuit comprises a saturable load module, a first change-over induction coil module and a second change-over induction coil module, wherein the saturable load module is composed of a load and a saturable reactor, the first change-over induction coil module is connected to the saturable load module and a first potential, and the second change-over induction coil module is coupled with the magnetic force of the first change-over induction coil module and is connected to the first change-over induction coil module and a second potential; the first change-over induction coil module and the second change-over induction coil module are utilized to change over the power supply. The saturation effect of the saturable reactor makes the end-point potential of the saturable reactor drop before change over, which causes the end-point potential of the change-over switch to return to zero. The present invention also provides another change-over power supply converting circuit and a saturable transformer.
Description
Technical field
The present invention relates to a kind of switched-mode power supply change-over circuit and transformer, particularly relate to a kind ofly when doing supply of electric power and switch by switch, switched-mode power supply change-over circuit and the saturable formula transformer that current potential is a zero potential got in the friendship of its switch.
Background technology
For high efficiency switch type power converter, zero voltage switching is a very important loop technique, because switch type power converter, its switch whole load current that need circulate when switching, so the switch high handoff loss that will bear very high switching stress (switching stress) and be directly proportional with switching frequency.
At a high speed switch caused di/dt (current changing rate) in addition and dv/dt (voltage change ratio) can cause serious electromagnetic interference (EMI).
For the volume that reduces transducer and weight to improve its power density, must improve its switching frequency, this will make the shortcoming of switch type converter worsen more.Therefore be zero just can improve above-mentioned shortcoming if can make voltage that switch switches snap switch.Therefore, how to reduce switch type converter handoff loss, switch stress and electromagnetic interference (EMI) real by the user concern.
Known zero voltage switching has use soft hand-off (soft-switching techniques), as resonance type converter or half resonance type converter, the common oscillating circuit of forming by resonance inductor and resonant capacitor, produce the two-end-point of a zero potential, make that the diverter switch terminal voltage of diverter switch before dropping into load electric is zero potential in diverter switch.
See also Figure 1A, this figure is the buck resonant vibration converter of known zero voltage switching, and this type of transducer utilizes the resonant capacitor with switch in parallel, produces zero potential and makes switch can make zero voltage switching.
Though above-mentioned soft hand-off can reduce the handoff loss that diverter switch is produced because of zero voltage switching when switching, but oscillating circuit but brings a large amount of mesh current (tank current), these mesh currents will produce conduction loss in circuit, and this conduction loss will have a strong impact on the supply and the transmission of electric power, make the conversion efficiency of power supply reduce.
Summary of the invention
In view of this, the invention provides a kind of switched-mode power supply change-over circuit, it not only can be simplified circuit and produce zero voltage switching reduction handoff loss, can also reduce the generation of mesh current, reduces conduction loss greatly.
For achieving the above object, the invention provides a kind of switched-mode power supply change-over circuit, comprising:
One saturable formula load component, it is made up of a load and a saturable formula reactor;
One first suitching type inductance coil assembly is connected in series one first coil by one first switch and forms, and it is connected in this saturable formula load component and one first current potential;
One second suitching type inductance coil assembly is connected in series one second coil by a second switch and forms, and it is connected in this first suitching type inductance coil assembly and one second current potential;
Wherein, the mutual magnetic force coupling of this first coil and second coil, this first current potential and second current potential magnetize to this first coil and this second coil when this first switch and the common conducting of second switch, the magnetic energy of this first coil and this second coil transfers to this saturable formula load component when this first switch and this second switch are alternately opened a way, and behind certain hour, this saturable formula reactor makes that by its saturation effect the switch end points current potential of this open circuit is zero, the conducting at this moment of the switch of this open circuit.
For achieving the above object, the present invention also provides a kind of switched-mode power supply change-over circuit, comprising:
One transformer comprises one first primary coil, one second primary coil and a level coil, and this secondary coil and connect a load;
One saturable formula reactor, it is parallel to the arbitrary coil of this transformer or the tandem compound of described coil;
The combination of one first suitching type primary coil is connected in series this first primary coil by one first switch and forms;
The combination of one second suitching type primary coil is connected in series this second primary coil by a second switch and forms;
Wherein, this combination of first suitching type primary coil and this second suitching type primary coil combined serial, and its contact is connected to a reactor and another contact of this reactor is connected in one first current potential, and this first suitching type primary coil combination then is connected in a reference potential with another end points of this first suitching type primary coil combined serial; This first primary coil and this second primary coil constitute equivalent short circuit because of mutual inductance when first switch and the common conducting of second switch, this first current potential thereby be able to this reactor is magnetized, the magnetic energy of this reactor transfers to this first primary coil and this second primary coil when this first switch and this second switch are alternately opened a way, and behind certain hour, this saturable formula reactor makes that by its saturation effect the end points current potential of this open switch is zero, the conducting at this moment of this open switch.
For achieving the above object, the present invention also provides a kind of saturable formula transformer, its magnetic core comprises a magnetic flux path, and wherein one section basal area is less than the basal area of other parts, this section magnetic core thereby be able to quite entering the magnetic saturation state ahead of time under the magnetic flux than other parts magnetic core.
Description of drawings
Figure 1A is the buck resonant vibration converter of known zero voltage switching;
Figure 1B is known transformer magnetic core stereogram;
Fig. 2 is the switched-mode power supply change-over circuit figure of first embodiment of the invention;
Fig. 3 is an operation waveform schematic diagram of the present invention;
Fig. 4 is another switched-mode power supply change-over circuit figure of first embodiment of the invention;
Fig. 5 is the another switched-mode power supply change-over circuit figure of first embodiment of the invention;
Fig. 6 is one the switched-mode power supply change-over circuit figure again of first embodiment of the invention;
Fig. 7 is the switched-mode power supply change-over circuit figure of second embodiment of the invention;
Fig. 8 is the switched-mode power supply change-over circuit figure of third embodiment of the invention;
Fig. 9 is another switched-mode power supply change-over circuit figure of third embodiment of the invention;
Figure 10 is a saturable formula transformer magnetic core stereogram of the present invention.
Wherein, description of reference numerals is as follows:
11 first suitching type inductance coil assemblies
13 second suitching type inductance coil assemblies
15 saturable formula load components
The V1 first current potential V2 second current potential
GND reference potential S1 first switch
S2 second switch L1 main inductance coil
The L1a first coil L1b second coil
L2 saturable formula reactor D1 first diode
The D2 second diode C3 the 3rd capacitor
C4 the 4th capacitor R1 load
I1 first electric current I 2 second electric currents
I3 the 3rd electric current I 4 the 4th electric current
I5 the 5th electric current V3 intermediate ends point voltage
12 first end points, 14 second end points
The T1 first transformer I6 secondary current
The T2 first saturable formula transformer 17 connects output point altogether
21 first end points, 22 second end points
23 the 3rd end points 24 the 4th end points
The C1 first capacitor C2 second capacitor
The T3 second transformer T4 second saturable formula transformer
32 first end points, 34 second end points
36 centre tap end points, 38 commutation circuits
L3 reactor C5 the 5th capacitor
42 shoulder posts are to 44 magnetic flux paths
Basal area in the middle of the 45 center pillar A0
The basal area of Ae magnetic flux path
Embodiment
See also Fig. 2, it is the switched-mode power supply change-over circuit figure of first embodiment of the invention.Wherein the first suitching type inductance coil assembly 11 is made up of first switch S, 1 serial connection, the first coil L1a, the second suitching type inductance coil assembly 13 is connected in series the second coil L1b by second switch S2 and forms, saturable formula load component 15, form with saturable formula reactor L2 via rectification circuit 18 by load R1, the wherein first coil L1a and second coil L1b magnetic force coupling, form main inductance coil L1, and end points 16 in the middle of main inductance coil L1 middle part is provided with, therefore end points 16 is divided into the first coil L1a and the second coil L1b with main inductance coil L1 in the middle of, another end points of the first coil L1a is first end points 12 of main inductance coil L1, another end points of the second coil L1b is second end points 14 of main inductance coil L1, first end points 12 is connected in an end of first switch S 1 and second end points 14 is connected in the end of second switch S2, and the other end of first switch S 1 then is connected to the first current potential V1, the other end of second switch S2 then is connected to the second current potential V2, and the middle end points 16 of main inductance coil L1 is connected to the end of saturable formula reactor L2, the saturable formula reactor L2 other end then is connected in reference potential GND, this rectification circuit 18 is connected to saturable formula reactor L2 two ends with the required electric power of power source conversion supply load R1, and wherein this rectification circuit 18 is by the first diode D1, the second diode D2, the 3rd capacitor C3 and the 4th capacitor C4 form.
See also Fig. 3, this figure is an operation waveform schematic diagram of the present invention, please again in conjunction with the switched-mode power supply change-over circuit figure of Fig. 2 first embodiment of the invention, wherein this longitudinal axis is for being respectively S1, S2, I1, I2, I3, V3, I5, the operation waveform axle of I6 and I4, transverse axis is a time shaft, when time during from t1 to t2, first switch S 1 is that closed circuit state (ON) and second switch are open-circuit condition (OFF), this moment, the first coil L1a accepted the electric power of being supplied from the first current potential V1, produce first electric current I 1, because second switch S2 is that open-circuit condition (OFF) is so second electric current I 2 is zero, first electric current I 1 flows out via middle end points 16, form the 3rd electric current I 3, so the 5th electric current of saturable formula reactor L2 is almost nil because the characteristic that saturable formula reactor L2 has the repulsion electric current to be increased is suddenly flowed through, therefore the 3rd electric current I 3 almost flows to rectification circuit 18 totally and forms the 4th electric current I 4, after rectification circuit 18 rectifications, the electric power that supply load R1 is required, in the middle of this moment voltage V3 and the first current potential V1 and the first coil L1a of end points 16 return the voltage of speeding with equate and first electric current I 1, the 3rd electric current I 3 and the 4th electric current I 4 are also almost equal.
When time during from t2 to t2+, first switch S 1 still is a closed circuit state (ON), this moment first electric current I 1, second electric current I 2 and the 3rd electric current I 3 still remain unchanged, because this moment, saturable formula reactor L2 entered saturation condition, therefore the 3rd electric current I 3 will almost flow to saturable formula reactor L2 totally, so the 5th electric current I 5 this moment the 3rd electric current I 3 no better than, and the 4th electric current I 4 is zero, because saturable formula reactor L2 enters saturation condition, so its two terminal potential, the voltage V3 of end points 16 falls after rise toward reference potential GND promptly, because of first end points 12 of main inductance coil L1 still is in the first current potential V1, second end points 14 will be responded to a reverse voltage, and its value tends to the second current potential V2 with the falling of middle end points 16 voltages.The end-point voltage of second switch S2 makes zero when time t2+, and second switch S2 conducting at this moment reaches the purpose that zero potential is switched.When time during from t3 to t4, first switch S 1 is that open-circuit condition (OFF) and second switch are closed circuit state (ON), this moment, the second coil L1b accepted the electric power of being supplied from the second current potential V2, produce second electric current I 2, because first switch S 1 is that open-circuit condition (OFF) is so first electric current I 1 is zero, end points 16 formed the 3rd electric current I 3 in the middle of second electric current I 2 flow through, and it is opposite with the current flowing direction of the 3rd electric current I 3, saturable formula reactor L2 will restore to the original state rapidly this moment, and repelling electric current increases suddenly, making the 5th electric current fall is zero, therefore the 3rd electric current I 3 rectification circuit 18 of almost totally flowing through forms the 4th electric current I 4, after rectification circuit 18 rectifications, the electric power that supply load R1 is required, voltage V3 and the returning of the second current potential V2 and the second coil L2b of the end points 16 voltage sum of speeding equates in the middle of this moment, and second electric current I 2, the 3rd electric current I 3 and the 4th electric current I 4 are also almost equal.
When time during from t4 to t4+, second switch S2 still is a closed circuit state (ON), this moment first electric current I 1, second electric current I 2 and the 3rd electric current I 3 still remain unchanged, because this moment, saturable formula reactor L2 entered saturation condition once again, therefore the 3rd electric current I 3 is with the saturable formula reactor L2 that almost flow through totally, so the 5th electric current I 5 this moment the 3rd electric current I 3 no better than, and the 4th electric current I 4 is zero, because saturable formula reactor L2 enters saturation condition, so its two terminal potential, the voltage V3 of end points 16 falls after rise toward reference potential GND promptly, because of second end points 14 of main inductance coil L1 still is in the second current potential V2, first end points 12 will be responded to a reverse voltage, and its value tends to the first current potential V1 with the falling of middle end points 16 voltages.The end-point voltage of first switch S 1 makes zero when time t4+, and first switch S 1 conducting at this moment reaches the purpose that zero potential is switched.
According to above-mentioned, when first switch S 1 closed circuit (ON) and second switch S2 open circuit (OFF), the required electric power of load R1 is by the energy supply of speeding of returning of the first current potential V1 and the first coil L1a, when first switch S, 1 open circuit (OFF) and second switch S2 closed circuit (ON), the required electric power of load R1 is by the energy supply of speeding of returning of the second current potential V2 and the second coil L1b, its two ends are zero potential when saturated when saturable formula reactor L2 enters, control first switch S 1 and second switch S2 while closed circuit (ON), main inductance coil L1 is able to from the first current potential V1 and the second current potential V2 makeup energy, finish up to change action, and when the voltage V3 of middle end points 16 falls after rise toward reference potential GND because of saturable formula reactor L2 saturated, the switch terminals point voltage of open circuit is revert to zero potential, to finish the zero voltage switching of switch, because the zero voltage switching of switch, and then the handoff loss when reducing switch and switching.
See also Fig. 4, this figure is another switched-mode power supply change-over circuit figure of first embodiment of the invention, according to Fig. 2, between saturable formula reactor L2 and rectification circuit 18 and meet the first transformer T1, the safe insulation of circuit can be provided by the insulation characterisitic of the first transformer T1 primary coil and secondary coil, this moment, the 4th electric current I 4 was flowed through the primary coil of the first transformer T1 simultaneously in secondary coil inductive secondary electric current I 6, this secondary current I6 and the 4th electric current I 4 its ratios are coil turn ratio N, and the required electric power of rectifier 18 offered load R1 of flowing through, its operation waveform schematic diagram is shown in Figure 3.
See also Fig. 5, this figure is the another switched-mode power supply change-over circuit figure of first embodiment of the invention, cooperate Fig. 4, wherein saturable formula reactor L2 can be replaced by the first saturable formula transformer T2 with being connected of the first transformer T1, and its operation waveform schematic diagram as shown in Figure 3.
See also Fig. 6, this figure is a suitching type power-switching circuit figure again of first embodiment of the invention, cooperate Fig. 2, the position of switch and coil gets in first and second suitching type inductance coil assembly by exchanging, wherein the end points of the first coil L1a is first end points 21 and second end points 22, the end points of the second coil L1b is the 3rd end points 23 and the 4th end points 24, and first end points 21 is connected in the first current potential V1, the 3rd end points 23 is connected in the second current potential V2, second end points 22 is connected to an end of first switch S 1, the 4th end points 24 is connected to the end of second switch S2, and first switch S 1 is connected with the other end of second switch S2 to form and connects output point 17 altogether and be connected with the end of saturable formula reactor L2.
Please continue to consult Fig. 6, the change action of its switch is identical with the switched-mode power supply change-over circuit of the operation waveform of circuit and Fig. 2 first embodiment of the invention.
See also Fig. 7, this figure is the switched-mode power supply change-over circuit figure of second embodiment of the invention, its another switched-mode power supply change-over circuit figure according to Fig. 4 first embodiment of the invention changes and forms, wherein the first suitching type inductance coil assembly 11 is made up of first switch S, 1 serial connection, the first coil L1a, the second suitching type inductance coil assembly 13 is connected in series the second coil L1b by second switch S2 and forms, saturable formula load component 15 is by load R1 and rectification circuit 18, transformer T1 and saturable formula reactor L2 form, wherein the first coil L1a and the second coil L1b form main inductance coil L1, end points 16 is divided into the first coil L1a and the second coil L1b with main inductance coil L1 in the middle of it, another end points of the first coil L1a is first end points 12 of main inductance coil L1, another end points of the second coil L1b is second end points 14 of main inductance coil L1, first end points 12 is connected in an end of first switch S 1 and second end points 14 is connected in the end of second switch S2, and the other end of first switch S 1 then is connected to the first current potential V1, the other end of second switch S2 then is connected to reference potential GND, and the middle end points 16 of main inductance coil L1 is connected to the end points of saturable formula reactor L2, and circuit only needs one first current potential V1 and has increased by the first capacitor C1 and the second capacitor C2, the first capacitor C1 one end is connected in the first current potential V1, the other end is connected in another end points of the second capacitor C2 and saturable formula reactor L2, the other end of the second capacitor C2 is connected in reference potential GND and second switch S2, in above-mentioned, do the switching of supply of electric power with this first suitching type inductance coil assembly 11 and this second suitching type inductance coil assembly 13, by the saturation effect of this saturable formula reactor L2, make preceding its end points current potential of diverter switch conducting make zero.
Please continue to consult Fig. 7, earlier first capacitor C 1 and second capacitor C 2 are charged by the first current potential V1, again via of the switching of first switch S 1 with second switch S2, make win capacitor C 1 and the stored voltage energy of second capacitor C 2, provide required electric power via the first transformer T1 and 18 couples of load R1 of rectifier respectively, wherein its two terminal potential becomes zero when saturable formula reactor L2 reaches capacity, control first switch S 1 and second switch S2 while closed circuit (ON) this moment, because saturable formula reactor L2 produces saturation effect, therefore before switch switches, can be because saturable formula reactor L2 two terminal potentials become zero, make its two ends form zero potential, reaching zero potential hands over more, because the zero voltage switching of switch, and then the handoff loss when reducing switch and switching, wherein saturable formula reactor L2 can be replaced by the first saturable formula transformer T2 with being connected of the first transformer T1.Its operation waveform schematic diagram as shown in Figure 3.
See also Fig. 8, this figure is the switched-mode power supply change-over circuit figure of third embodiment of the invention, wherein the second transformer T3 comprises first primary coil and second primary coil, and be connected with the external world by first end points 32, second end points 34 and centre tap end points 36, and its secondary coil is connected to rectification circuit 18; Saturable formula reactor L2 is connected in first end points 32 and second end points 34; Load R1 is connected in this rectification circuit 18; Commutation circuit 38 is connected in first end points 32 and second end points 34, and wherein first switch S, 1 serial connection, first primary coil is formed the combination of one first suitching type primary coil, and second switch S2 is connected in series second primary coil and forms the combination of one second suitching type primary coil; Reactor L3, the one end is connected in centre tap end points 36, and the other end is connected in the first current potential V1; And a reference potential GND, be a zero potential.
In above-mentioned, do the switching of supply of electric power with this commutation circuit 38, saturation effect by saturable formula reactor L2 makes its two ends form zero potential, make that this first end points 32 is a zero potential with this second end points 34 when switching, wherein commutation circuit 38 is made up of with second switch S2 first switch S 1, the one end is connected in series with this first end points 32, this second end points 34 respectively, and its other end then is connected in this reference potential GND jointly.
Please continue to consult Fig. 8, when first switch S 1 closed circuit (ON), the first current potential V1 can provide electric power, be sent to rectifier 18 through the second transformer T3 and arrive load R1 again, its two terminal potential falls after rise when saturable formula reactor L2 is saturated, and then makes that the end points current potential of second switch S2 is a zero potential, can make this moment second switch S2 closed circuit (ON) to form the zero voltage switching of switch, because the zero voltage switching of switch, and then the handoff loss when reducing switch and switching.Wherein saturable formula reactor L2 can be replaced by the second saturable formula transformer T4 with being connected of the second transformer T3, and its operation waveform schematic diagram as shown in Figure 3.
See also Fig. 9, this figure is another switched-mode power supply change-over circuit figure of third embodiment of the invention, can change according to the switched-mode power supply change-over circuit figure of Fig. 8 third embodiment of the invention and get, wherein between the arbitrary coil of the second transformer T3 or described coil tandem compound and meet the 5th capacitor C5, and the rectification circuit that the secondary coil of the second transformer T3 connects in Fig. 8 omits, change over and connect AC load R2, wherein the 5th capacitor C5 can be parasitic capacitance, produced by the coiling electric capacity in other peripheral circuit or the second transformer T3, the 5th capacitor C5 can with the magnetic strength resonance of the second transformer T3, switching cycle with tuning change-over circuit, this circuit provides alternating electromotive force to use to AC load R2 by the first current potential V1 via the second transformer T3, and because the saturation effect of saturable formula reactor L2, first end points 32 and second end points 34 produce the zero potentials friendship more when making the switch switching, and then the handoff loss when reducing switch and switching, and when switch switches, the electric current of C5 because the electric current of saturation effect resonant groove path this moment is flowed through, can significantly be replaced by the saturation current in the saturable reactor L2, and reduce the mesh current of transformer induction coil of flowing through, thereby can effectively reduce the conduction loss that switch is produced between switching cycle.Its operation waveform schematic diagram as shown in Figure 3.
See also Figure 1B, this figure is known transformer magnetic core stereogram, wherein the basal area of magnetic flux path 44 is Ae, magnetic flux can pass through magnetic flux path 44 when transformer is switched on, and produce galvanomagnetic effect and output voltage, when magnetic flux was too high, saturation effect can take place in magnetic flux path 44, this saturation effect can any part take place on magnetic flux path 44 at random, makes transformer produce the not normal fault of action.
See also Figure 10, this figure is a saturable formula transformer magnetic core stereogram of the present invention, and comprising: lateral column is to 40; The shoulder post is to 42, and its two ends are linked to this lateral column respectively to 40 two ends; Center pillar 45, its two ends are linked to this lateral column to 40 via the shoulder post to 42.The basal area Ae that wherein reduces center pillar 45 centre forms the middle basal area A0 that a length is 1g, and middle basal area A0 is less than the two ends basal area, magnetic flux can pass through magnetic flux path 44 when transformer is switched on, and produce galvanomagnetic effect and output voltage, when magnetic flux is too high, saturation effect partly can take place earlier in middle basal area A0, and form the characteristic of a saturable formula reactance, because saturation effect partly can take place earlier in middle basal area A0, therefore so the two ends of magnetic flux path 44 do not have and saturatedly can continue operate as normal and can not produce the not normal fault of action, so saturable formula transformer magnetic core can be used as above-mentioned saturable formula transformer.
In sum, switched-mode power supply change-over circuit of the present invention can be by the saturation effect of saturable formula reactor, make that the switch end points is a zero potential when switching, and then the handoff loss when reducing switch and switching, and because the saturation effect of saturable formula reactor can effectively reduce the conduction loss that switch is produced between switching cycle.
But the above; only be the detailed description of the specific embodiment of one of the best of the present invention and graphic; all closing in the embodiment of claims spirit of the present invention variation similar with it; all should be contained in the category of the present invention; any those of ordinary skill of being familiar with this technology in the field of the invention, can think easily and variation or modify all can be encompassed within the claimed scope of claims of the present invention.
Claims (9)
1. switched-mode power supply change-over circuit comprises:
One saturable formula load component, it is made up of a load and a saturable formula reactor;
One first suitching type inductance coil assembly is connected in series one first coil by one first switch and forms, and it is connected in this saturable formula load component and one first current potential;
One second suitching type inductance coil assembly is connected in series one second coil by a second switch and forms, and it is connected in this first suitching type inductance coil assembly and one second current potential;
Wherein, the mutual magnetic force coupling of this first coil and second coil, this first current potential and second current potential magnetize to this first coil and this second coil when this first switch and the common conducting of second switch, the magnetic energy of this first coil and this second coil transfers to this saturable formula load component when this first switch and this second switch are alternately opened a way, and behind certain hour, this saturable formula reactor makes that by its saturation effect the switch end points current potential of this open circuit is zero, the conducting at this moment of the switch of this open circuit.
2. switched-mode power supply change-over circuit as claimed in claim 1, wherein this first coil and this second coil are made up of a main inductance coil.
3. switched-mode power supply change-over circuit as claimed in claim 1, wherein this load connects through a rectification circuit.
4. switched-mode power supply change-over circuit as claimed in claim 1, wherein this load or this saturable formula load component connect through a transformer.
5. switched-mode power supply change-over circuit as claimed in claim 4, wherein this saturable formula reactor and this transformer can be replaced by a saturable formula transformer and replace.
6. switched-mode power supply change-over circuit comprises:
One transformer comprises one first primary coil, one second primary coil and a level coil, and this secondary coil and connect a load;
One saturable formula reactor, it is parallel to the tandem compound between a plurality of arbitrary coil of arbitrary coil of this transformer or this transformer;
The combination of one first suitching type primary coil is connected in series this first primary coil by one first switch and forms;
The combination of one second suitching type primary coil is connected in series this second primary coil by a second switch and forms;
Wherein, this combination of first suitching type primary coil and this second suitching type primary coil combined serial, and its contact is connected to a reactor and another contact of this reactor is connected in one first current potential, and another end points of this first suitching type primary coil combination and this second suitching type primary coil combined serial then is connected in a reference potential; This first primary coil and this second primary coil constitute equivalent short circuit because of mutual inductance when first switch and the common conducting of second switch, this first current potential thereby be able to this reactor is magnetized, the magnetic energy of this reactor transfers to this first primary coil and this second primary coil when this first switch and this second switch are alternately opened a way, and behind certain hour, this saturable formula reactor makes that by its saturation effect the end points current potential of this open switch is zero, the conducting at this moment of this open switch.
7. switched-mode power supply change-over circuit as claimed in claim 6 wherein is connected a rectification circuit between the secondary coil of this transformer and this load.
8. switched-mode power supply change-over circuit as claimed in claim 6 wherein also has a capacitor to be connected to tandem compound between a plurality of arbitrary coil of arbitrary coil of this transformer or this transformer.
9. switched-mode power supply change-over circuit as claimed in claim 6, wherein this saturable formula reactor and this transformer can be replaced by a saturable formula transformer and replace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101181203A CN100380796C (en) | 2003-11-25 | 2003-11-25 | Switching type power switching circuit and saturable transformer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101181203A CN100380796C (en) | 2003-11-25 | 2003-11-25 | Switching type power switching circuit and saturable transformer |
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| Publication Number | Publication Date |
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| CN1622439A CN1622439A (en) | 2005-06-01 |
| CN100380796C true CN100380796C (en) | 2008-04-09 |
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| CNB2003101181203A Expired - Fee Related CN100380796C (en) | 2003-11-25 | 2003-11-25 | Switching type power switching circuit and saturable transformer |
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|---|---|---|---|---|
| CN87104538A (en) * | 1986-07-01 | 1988-02-24 | 迈格普尔斯公司 | A kind of silicon controlled rectifier (SCR) starting that has improved and remove circuit arrangement |
| US5942134A (en) * | 1996-05-29 | 1999-08-24 | Robert Bosch Gmbh | Frequency-changing welding arrangement |
| CN1295376A (en) * | 1999-10-21 | 2001-05-16 | 索尼株式会社 | Switching power system |
| JP2002315334A (en) * | 2001-04-17 | 2002-10-25 | Sony Corp | Switching power supply circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1622439A (en) | 2005-06-01 |
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