CN101494415A - Switching type power supply apparatus and method for improving light load efficiency - Google Patents
Switching type power supply apparatus and method for improving light load efficiency Download PDFInfo
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- CN101494415A CN101494415A CN 200810001461 CN200810001461A CN101494415A CN 101494415 A CN101494415 A CN 101494415A CN 200810001461 CN200810001461 CN 200810001461 CN 200810001461 A CN200810001461 A CN 200810001461A CN 101494415 A CN101494415 A CN 101494415A
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Abstract
The invention provides a switching power supply and a method thereof for improving the light load efficiency. The switching power supply which can be operated in a first mode and in a second mode comprises a first output stage outputting a first phasing current to the output of the switching power supply by a first coupling inductance according to a first control signal and a second output stage outputting a second phasing current to the output of the switching power supply by a second coupling inductance according to a second control signal. After the switching power supply enters the second mode, the values of the first coupling inductance and the second coupling inductance are increased or the phase difference between the first signal and the second control signal is reduced to improve the light load efficiency of the switching power supply.
Description
Technical field
The present invention relates to a kind of switched power supply, specifically, is a kind of switched power supply and method thereof of improving light load effect.
Background technology
Since coupling inductance can reduce phase current ripple, reduce inductor size and power switch electric current pressure, therefore in some heterogeneous switched power supplies, use coupling inductance to replace non-coupling inductance.Fig. 1 is the known two-phase step-down switched power supply 10 with coupling inductance, wherein output stage 12 comprises that transistor 122 and 124 is connected between voltage Vin and the earth terminal GND, the switching of control signal V11 and V12 oxide- semiconductor control transistors 122 and 124 and produce phase current I1 through the output of coupling inductance L1 to switched power supply 10, output stage 14 comprises that transistor 142 and 144 is connected between electric Vin and the earth terminal GND, the switching of control signal V21 and V22 oxide- semiconductor control transistors 142 and 144 and produce phase current I2 through the output of coupling inductance L2 to switched power supply 10, charging produces voltage Vo to load R to capacitor C o in conjunction with producing electric current I o for phase current I1 and I2, wherein have coupling effect between coupling inductance L1 and the L2, M is the phase mutual inductance value (mutual inductance) of coupling inductance L1 and L2.When load R was heavy duty, power supply unit 10 operated in continuous conduction mode (Continuous Conduction Mode; CCM), when load R was underloading, power supply unit 10 operated in DCM (Discontinuous Conduction Mode; DCM).
Has aforesaid advantage though have the power supply unit 10 of coupling inductance, but, also produce more light load effect problem, and the basic reason of this problem is that the power supply unit with coupling inductance has two kinds of DCM, at this it is called DCM I and DCM II.The oscillogram of phase current I1 and I2 and control signal V11 and V21 when power supply unit 10 operates in DCM I in Fig. 2 displayed map 1, wherein waveform 20 is control signal V11, and waveform 22 is control signal V21, and waveform 24 is phase current I1, and waveform 26 is phase current I2.The oscillogram of phase current I1 and I2 and control signal V11 and V21 when power supply unit 10 operates in DCM II in Fig. 3 displayed map 1, wherein waveform 30 is control signal V11, waveform 32 is control signal V21, waveform 34 is phase current I1, waveform 36 is phase current I2, waveform 38 is phase current I1, and waveform 39 is phase current I2.After load R transfers underloading to by heavy duty, load current on the load R will descend gradually, therefore power supply unit 10 will enter DCMI by CCM, with reference to Fig. 2, when time t0, control signal V11 transfers high levle to, thus phase current I1 rising, when time t1, control signal V11 transfers low level to, so phase current I1 begins to descend, when time t2, control signal V21 transfers high levle to, so phase current I2 rises, because the coupling effect between inductance L 1 and the L2, so phase current I1 will be driven and rise and little sharp wave (littlespike) occur, when time t3, control signal V21 transfers low level to, so phase current I1 descends once more, when time t4, phase current I1 reduces to 0 point.When load current further descends, power supply unit 10 will enter DCM II, with reference to Fig. 3, when time T 0, control signal V11 transfers high levle to, thus phase current I1 rising, when time T 1, control signal V11 transfers low level to, so phase current I1 begins to descend, when time T 2, phase current I1 is reduced to 0 point, then when time T 3, control signal V21 transfers high levle to, and is same, because the coupling effect between inductance L 1 and the L2, phase current I1 is driven rising and little sharp wave occurred, when time T 4, control signal V21 transfers low level to, so phase current I1 descends, when time T 5, phase current I1 reduces to 0 point once more.By the waveform of Fig. 2 and Fig. 3 as can be seen, the main difference of DCM I and DCM II is, phase current I1 among the DCM I only touches at 0 once in each cycle of control signal V11, and the phase current I1 among the DCM II touches 0 secondary in each cycle of control signal V11.
I1 becomes negative value for fear of phase current, therefore when phase current I1 is reduced to 0, transistor 124 will be closed (turn off), but in DCM II, transistor 124 will be imitated the sharp wave that is caused because of coupling and be carried out once extra ON/OFF action again after closing, this will cause extra energy loss, if force transistor 124 not carry out this extra action, also will reduce usefulness because of parasitic diode (bodydiode) conducting loss.No matter whether transistor 124 carry out extra action, all the power supply unit than no coupling inductance is low to have the usefulness of power supply unit 10 of coupling inductance.
The paper that Virginia Polytechnics (Virginia Tech) delivers on APEC in 2007 " The light load issue of coupled inductor laptop voltage regulatorsand its solutions " has proposed two kinds of methods and has avoided switched power supply to enter DCMII.First method system destroys coupling circuit (coupled loop), Fig. 4 Display Realization is destroyed the example of coupling circuit, in switched power supply 40, output stage 42 and 44 provides phase current i1 and i2 through inductance L 3 and the L4 output Vo to power supply unit 40 respectively, inductance L 3 has first siding ring 402 and second siding ring 404, wherein first siding ring 402 is connected between the output Vo of output stage 42 and power supply unit 40, inductance L 4 also has first siding ring 406 and secondary side line 408, wherein first siding ring 406 is connected between the output Vo of output stage 44 and power supply unit 40, whether switch Qx control second siding ring 404 and 408 connects, when heavy duty, switch Qx opens (turn on), have coupling effect between inductance L 3 and the L4 this moment, when power supply unit 40 during near DCM II, switch Qx closes (turn off), and coupling effect will disappear this moment, and the little sharp wave that produces because of coupling effect also will disappear.
The second method that Virginia Polytechnics proposes is synchronous all phase places, with reference to Fig. 3, concerning coupling effect, phase difference between control signal V11 and the V21 is necessary, therefore, when not having phase difference between control signal V11 and the V21, coupling effect will disappear, and little sharp wave and DCMII also will disappear.The purpose of these two kinds of methods all is to remove coupling effect, and difference only is to utilize magnet assembly or control method to reach and removes action, has not had coupling effect will not have little sharp wave, also has no chance to take place DCM II.Yet, removed coupling effect, also will make the advantage of coupling effect disappear.
Therefore known switched power supply exists above-mentioned all inconvenience and problem.
Summary of the invention
Purpose of the present invention is to propose a kind of switched power supply and method thereof of improving light load effect.
For achieving the above object, technical solution of the present invention is:
A kind of switched power supply that improves light load effect, it may operate in first pattern and second pattern, comprises nonlinear first inductance, nonlinear second inductance, one first output stage and one second output stage is characterized in that:
Described nonlinear first inductance, during described power supply unit operates in described first pattern, described first inductance has one first inductance value, and after described power supply unit entered described second pattern, described first inductance had second inductance value greater than described first inductance value;
Described nonlinear second inductance, and has coupling effect between described first inductance, during described power supply unit operates in described first pattern, described second inductance has one the 3rd inductance value, after described power supply unit entered described second pattern, described second inductance had the 4th inductance value greater than described the 3rd inductance value;
Described first output stage is exported one first phase current through the output of described first nonlinear inductance to described switched power supply; And
Described second output stage is exported one second phase current through the output of described second nonlinear inductance to described switched power supply.
Switched power supply of the present invention can also be further achieved by the following technical measures.
Aforesaid switched power supply, wherein said first inductance comprises a solenoid, it has described first inductance value when the magnetic saturation state, have described second inductance value when non-magnetic saturation state.
Aforesaid switched power supply, wherein said second inductance comprises a solenoid, it has described the 3rd inductance value when the magnetic saturation state, have described the 4th inductance value when non-magnetic saturation state.
Aforesaid switched power supply, wherein said first inductance comprises:
One the 3rd inductance has described first inductance value;
One the 4th inductance has described second inductance value; And
One switches circuit, determines described first phase current by described the 3rd inductance or the 4th inductance.
Aforesaid switched power supply, wherein said second inductance comprises:
One the 3rd inductance has described the 3rd inductance value;
One the 4th inductance has described the 4th inductance value; And
One switches circuit, determines described second phase current by described the 3rd inductance or the 4th inductance.
A kind of method of improving the switched power supply light load effect, described switched power supply may operate in first pattern and second pattern, described switched power supply comprises one first phase current through the output of one first coupling inductance to described switched power supply, and one second phase current through one second coupling inductance to the output of described switched power supply, have coupling effect between described first and second coupling inductance, described method comprises the following steps:
First step: after described switched power supply enters described second pattern by described first pattern, described first coupling inductance is changed into one second inductance value by one first inductance value, described second inductance value is greater than described first inductance value;
Second step: after described switched power supply enters described second pattern by described first pattern, described second coupling inductance is changed into one the 4th inductance value by one the 3rd inductance value, described the 4th inductance value is greater than described the 3rd inductance value.
The aforesaid method of improving the switched power supply light load effect, wherein said first coupling inductance comprises a solenoid.
The aforesaid method of improving the switched power supply light load effect wherein more comprises the value that changes described first coupling inductance by the saturated phenomenon of described solenoid.
The aforesaid method of improving the switched power supply light load effect, wherein said second coupling inductance comprises a solenoid.
The aforesaid method of improving the switched power supply light load effect wherein more comprises the value that changes described second coupling inductance by the saturated phenomenon of described solenoid.
The aforesaid method of improving the switched power supply light load effect, wherein said first coupling inductance comprise that one first inductance has described first inductance value and one second inductance has described second inductance value.
The aforesaid method of improving the switched power supply light load effect, wherein the step that described first coupling inductance is changed into one second inductance value by one first inductance value comprises described first phase current is switched to described second inductance by described first inductance.
The aforesaid method of improving the switched power supply light load effect, wherein said second coupling inductance comprise that one first inductance has described the 3rd inductance value and one second inductance has described the 4th inductance value.
The aforesaid method of improving the switched power supply light load effect, wherein the step that described second coupling inductance is changed into one the 4th inductance value by one the 3rd inductance value comprises described second phase current is switched to described second inductance by described first inductance.
A kind of switched power supply that improves light load effect, it may operate in first pattern and second pattern, comprises one first coupling inductance, one second coupling inductance, one first output stage, one second output stage and a phase difference adjuster is characterized in that:
Has coupling effect between described first coupling inductance and described second coupling inductance;
Described one first output stage is exported one first phase current through the output of described first coupling inductance to described switched power supply according to one first control signal;
Described second output stage is exported one second phase current through the output of described second coupling inductance to described switched power supply according to one second control signal; And
Described phase difference adjuster is adjusted the phase difference between described first and second control signal.
Aforesaid switched power supply, wherein said phase difference adjuster comprise choose in the 3rd control signal of a multiplexer by a plurality of outs of phase one of them as described second control signal to change described phase difference.
Aforesaid switched power supply, wherein said phase difference adjuster comprise that one postpones cell element in order to postpone described second control signal to change described phase difference.
Aforesaid switched power supply, wherein said phase difference is greater than 0.
Aforesaid switched power supply, wherein said phase difference adjuster reduce described phase difference after described switched power supply enters described second pattern by described first pattern.
A kind of method of improving the switched power supply light load effect, described switched power supply may operate in first pattern and second pattern, comprise one first output stage according to one first control signal export one first phase current through one first coupling inductance to the output of described switched power supply and, one second output stage is exported one second phase current through the output of one second coupling inductance to described switched power supply according to one second control signal, have coupling effect between described first and second inductance, described method comprises the following steps:
First step: during described switched power supply operates in described first pattern, regulate described first and second control signal, make to have one first phase difference between it;
Second step: when described switched power supply enters described second pattern, regulate described first and second control signal, make to have one second phase difference between it, described second phase difference is less than described first phase difference.
The aforesaid method of improving the switched power supply light load effect, wherein regulate described first and second control signal, the step that has one second phase difference between it is comprised by choosing one of them as described second control signal in a plurality of the 3rd control signals with out of phase.
The aforesaid method of improving the switched power supply light load effect is wherein regulated described first and second control signal, the step that has one second phase difference between it is comprised postpone described second control signal.
After adopting technique scheme, the switched power supply that improves light load effect of the present invention, use has the different induction value and uses the adjustable phase of heterogeneous switched power supply poor when high/low current status, have the advantage of the light load effect that improves switched power supply.
Description of drawings
Fig. 1 is the known two-phase step-down switched power supply with coupling inductance;
The oscillogram of phase current I1 and I2 and control signal V11 and V21 when power supply unit operates in DCM I in Fig. 2 displayed map 1;
The oscillogram of phase current I1 and I2 and control signal V11 and V21 when power supply unit operates in DCM II in Fig. 3 displayed map 1;
Fig. 4 Display Realization is destroyed the example of coupling circuit;
Fig. 5 shows two-phase switched power supply of the present invention;
Fig. 6 shows two kinds of inductance value of nonlinear inductance;
Fig. 7 shows the embodiment of nonlinear inductance of the present invention;
Fig. 8 shows the embodiment of first kind of realization of the present invention " adjustable phase techniques ";
Fig. 9 is presented under the normal running voltage on the output of each output stage among Fig. 8;
Figure 10 shows the another kind of embodiment that realizes " adjustable phase techniques " of the present invention; And
Figure 11 shows the waveform of each signal among Figure 10.
Embodiment
The present invention proposes two kinds of methods " nonlinear inductance technology (non-linear inductance techniques) " that are different from Virginia Polytechnics and reaches " adjustable phase difference technology (adjustable phase difference techniques) "." nonlinear inductance technology " is that use has a different induction value when high/low current status inductance reaches preferable light load effect, and " adjustable phase difference technology " is to use the advantage of the adjustable phase difference of heterogeneous switched power supply to reach identical target.These two kinds of methods have different application, but the both is in order to improve light load effect.These two kinds of principles that method relied on avoid phase current I1 and I2 to reduce to 0 exactly before control signal V11 and V21 transfer high levle to, therefore are expanded to littler in order to the minimum current of keeping DCM I, so light load effect is enhanced.The method of Virginia Polytechnics system eliminates the possibility of DCM II fully, but method of the present invention then is to allow into the chance of DCM II reduce to minimum.
Below will reach " adjustable phase difference technology " two kinds of methods and do detailed explanation " nonlinear inductance technology " of the present invention:
(1) nonlinear inductance technology
Fig. 5 shows two-phase switched power supply 50 of the present invention, wherein output stage 52 has power switch SW1 and SW2 is connected between input voltage vin and the earth terminal GND, the switching of control signal V11 and V12 difference control switch SW1 and SW2 is to produce phase current I1 through the output Vo of nonlinear inductance 56 to power supply unit 50, output stage 54 has switch SW 3 and SW4 is connected between input voltage vin and the earth terminal GND, control signal V21 and V22 respectively control switch SW3 and SW4 switching with produce phase current I2 through nonlinear inductance 58 to output Vo, charging produces output voltage V o to load R to capacitor C o in conjunction with producing electric current I o for phase current I1 and I2, has coupling effect between the nonlinear inductance 56 and 58.Fig. 6 shows two kinds of inductance value of nonlinear inductance, and when heavy duty, nonlinear inductance 56 and 58 has less inductance value L
sHelp to obtain good instantaneous ability, this is very important at normal manipulation mode, normal manipulation mode CCM just wherein, and when underloading, nonlinear inductance 56 and 58 has bigger inductance value L
LDuring DCM II, to reduce the slope of phase current I1 and I2, shown in the waveform 38 and 39 of Fig. 3, thereby postpone zero contact point (zero touching point) of phase current I1 and I2, and needing only before control signal V11 and V21 transfer high levle to does not have zero contact point, and DCM II will can not take place.Figure 6 shows that the inductance value under the perfect condition changes, in fact, when underloading, nonlinear inductance 56 and 58 inductance value possibly can't maintain L always
L, therefore, may comprise two kinds of inductance value L at the operating time of control signal V11 and V21 Ton
LAnd L
S, for example, during time T on1, nonlinear inductance 56 and 58 inductance value are L
L, during time T on1, nonlinear inductance 56 and 58 inductance value are L
s, as shown in Figure 3, if when knowing the accurate position of the minimum current of DCM I, can utilize formula 1 to calculate and avoid phase current before control signal transfers high levle to, to contact 0 inductance value L
L
Wherein, f
sSwitching frequency for power switch.
(2) adjustable phase difference technology
Waveform 30,32,34 and 36 by Fig. 3 can be found out, if the phase difference of control signal V11 and V21 is reduced, can successfully reduce the minimum current of DCMI, that is to say DCM II more difficult to get access.Behind the minimum electricity of decision DCM I, can calculate the phase difference of most critical, notice that phase difference can not equally be eliminated coupling effect with known techniques avoiding for 0, so can get following formula:
Wherein, d is a phase difference, and Ton is the operating time of control signal V11 and V21, and L is the inductance value of inductance L 1 and L2.According to formula 2 can push away phase difference
(2 * fs) time, wherein fs is a switching frequency, can the reserve part coupling effect in 0＜d＜1/, if phase difference is 180 when spending, promptly (2 * fs) time, phase current ripple slip will be best to d=1/, though other phase difference can reduce the current ripple slip, do not eliminate fully.The method that realizes " adjustable phase difference technology " has a lot, proposes two methods as an illustration at this.
Fig. 8 shows the four phase switched power supplies 60 of irregular phase place of the present invention (scrambling the phases), wherein output stage 606 produces phase current I1 through the output Vo of inductance L 1 to power supply unit 60 according to control signal PWM1, multiplexer 602 by choose among control signal PWM2 and the PWM3 one of them give output stage 608 with produce phase current I3 through inductance L 3 to output Vo, multiplexer 604 by choose among control signal PWM2 and the PWM3 one of them give output stage 610 with produce phase current I2 through inductance L 2 to defeated mountain Vo, output stage 612 according to control signal PWM4 produce phase current I4 through inductance L 4 to exporting Vo.In this embodiment, has coupling effect between inductance L 1 and the L3, have coupling effect between inductance L 2 and the L4, but this is to change in other embodiments that for example United States Patent (USP) the 6th, 545, the coupling circuit in No. 450.Fig. 9 is presented under the normal running voltage on the output of each output stage among Fig. 8, wherein waveform 70 is the voltage on the output Phase4 of output stage 612, waveform 72 is the voltage on the output Phase3 of output stage 608, waveform 74 is the voltage on the output Phase2 of output stage 610, and waveform 76 is the voltage on the output Phase1 of output stage 606.With reference to Fig. 8 and Fig. 9, under normal operation, multiplexer 602 is chosen control signal PWM3 and is given output stage 608, multiplexer 604 is chosen control signal PWM2 and is given output stage 610, waveform by Fig. 9 can be learnt, phase difference between control signal PWM1 and the PWM2 is 90 degree, and the phase difference between control signal PWM1 and the PWM3 is 180 degree, therefore, when power supply unit 60 enters DCM II, multiplexer 602 will be chosen control signal PWM2 and give output stage, make the phase difference between output Phasel and the Phase3 become 90 degree by 180 degree, and then allow the voltage on the output Phase3 before phase current I1 reduces to 0, transfer high levle to, to avoid 0 secondary of phase current I1 contact, same, multiplexer 604 is chosen control signal PWM3 and is given output stage 610 when power supply unit 60 enters DCM II, make the phase difference between output Phase2 and the Phase4 also become 90 degree by 180 degree, allow the voltage on the output Phase4 before phase current I2 reduces to 0, transfer high levle to, to avoid 0 secondary of phase current I2 contact.In other embodiments, multiplexer 602 and 604 also can be placed on output stage 606 and 612, output stage 606 and 608 or output stage 610 and 612 before.In heterogeneous switched power supply, also be suitable for irregular phase place.
Figure 10 shows the another kind of embodiment that realizes " adjustable phase techniques " of the present invention, in two-phase switched power supply 80, clock pulse generator 802 provides clock pulse CK1 and CK2, postpone cell element 804 and 806 and postpone clock pulse CK1 and CK2 generation clock pulse CK1d and CK2d respectively, sawtooth generator 808 produces sawtooth signal RMP1 and RMP2 according to clock pulse CK1d and CK2d, error amplifier 810 produces error signal Vc according to the output voltage V o and a reference voltage Vref of power supply unit 80, comparator 812 comparison error signal Vc and sawtooth signal RMP1 produce control signal PWM1 to output stage 816, comparator 814 comparison error signal Vc and sawtooth signal RMP2 produce control signal PWM2 to output stage 818, output stage 816 and 818 produces phase current I1 and I2 respectively through inductance L 1 and the L2 output Vo to power supply unit 80 according to control signal PWM1 and PWM2 respectively, wherein have coupling effect between inductance L 1 and the L2, postponing cell element 804 and 806 can be analog circuit or digital circuit.
Figure 11 shows the waveform of each signal among Figure 10, wherein waveform 82 is clock pulse CK1d, and waveform 83 is clock pulse CK2d, and waveform 84 is clock pulse CK2d, waveform 86 is sawtooth signal RMP1, waveform 88 is error signal Vc, and waveform 89 is sawtooth signal RMP2, and waveform 90 is sawtooth signal RMP2, waveform 92 is error signal Vc, waveform 94 is control signal PWM1, and waveform 95 is control signal PWM2, and waveform 96 is control signal PWM2.With reference to Figure 10 and Figure 11, during CCM and DCM I, clock pulse generator 802 provides the clock pulse CK1 and the CK2 of the non-overlapping of a pair of ideal, the phase difference that has 180 degree between the two, during this period, postpone the time of delay that cell element 804 and 806 provides phase, so clock pulse CK1d and CK2d still have the phase difference of 180 degree, shown in waveform 82 and 84, sawtooth generator 808 is to produce sawtooth waveforms RMP1 and RMP2 according to clock pulse CK1d and CK2d again, shown in waveform 86 and 90, so control signal PWM1 and PWM2 also have the phase differences of 180 degree, shown in waveform 94 and 96.
When power supply unit 80 enters DCM II, phase adjustment signal ph_adj provides to postponing cell element 806, after receiving signal ph_adj, postpone cell element 806 and shorten time of delay, therefore two delay cell elements 804 and 806 have different time of delay now, so clock pulse CK2d will move forward, shown in ripple 83, then sawtooth signal RMP2 and control signal PWM2 are also to reach, shown in waveform 89 and 95, make control signal PWM2 before phase current I1 reduces to 0, transfer high levle to, to avoid 0 secondary of phase current I1 contact.
In other embodiments, can not provide zero-lag before receiving phase adjustment signal ph_adj if postpone cell element 806, postponing cell element 804 can remove.
The method that is different from Virginia Polytechnics, the coupling effect of using power supply unit of the present invention still exists, and therefore has all advantages of coupling effect, and for example, little phase current ripple is so have usefulness preferably.Moreover, when the number of phases greater than 2 the time, two kinds of methods of the present invention stand good.
Above embodiment is only for the usefulness that the present invention is described, but not limitation of the present invention, person skilled in the relevant technique under the situation that does not break away from the spirit and scope of the present invention, can also be made various conversion or variation.Therefore, all technical schemes that are equal to also should belong to category of the present invention, should be limited by each claim.
Claims (22)
1. switched power supply that improves light load effect, it may operate in first pattern and second pattern, comprises nonlinear first inductance, nonlinear second inductance, one first output stage and one second output stage is characterized in that:
Described nonlinear first inductance, during described power supply unit operates in described first pattern, described first inductance has one first inductance value, and after described power supply unit entered described second pattern, described first inductance had second inductance value greater than described first inductance value;
Described nonlinear second inductance, and has coupling effect between described first inductance, during described power supply unit operates in described first pattern, described second inductance has one the 3rd inductance value, after described power supply unit entered described second pattern, described second inductance had the 4th inductance value greater than described the 3rd inductance value;
Described first output stage is exported one first phase current through the output of described first nonlinear inductance to described switched power supply; And
Described second output stage is exported one second phase current through the output of described second nonlinear inductance to described switched power supply.
2. switched power supply as claimed in claim 1 is characterized in that: described first inductance comprises a solenoid, and it has described first inductance value when the magnetic saturation state, has described second inductance value when non-magnetic saturation state.
3. switched power supply as claimed in claim 1 is characterized in that: described second inductance comprises a solenoid, and it has described the 3rd inductance value when the magnetic saturation state, has described the 4th inductance value when non-magnetic saturation state.
4. switched power supply as claimed in claim 1 is characterized in that: described first inductance comprises:
One the 3rd inductance has described first inductance value;
One the 4th inductance has described second inductance value; And
One switches circuit, determines described first phase current by described the 3rd inductance or the 4th inductance.
5. switched power supply as claimed in claim 1 is characterized in that: described second inductance comprises:
One the 3rd inductance has described the 3rd inductance value;
One the 4th inductance has described the 4th inductance value; And
One switches circuit, determines described second phase current by described the 3rd inductance or the 4th inductance.
6. method of improving the switched power supply light load effect, described switched power supply may operate in first pattern and second pattern, described switched power supply comprises one first phase current through the output of one first coupling inductance to described switched power supply, and one second phase current through one second coupling inductance to the output of described switched power supply, have coupling effect between described first and second coupling inductance, described method comprises the following steps:
First step: after described switched power supply enters described second pattern by described first pattern, described first coupling inductance is changed into one second inductance value by one first inductance value, described second inductance value is greater than described first inductance value;
Second step: after described switched power supply enters described second pattern by described first pattern, described second coupling inductance is changed into one the 4th inductance value by one the 3rd inductance value, described the 4th inductance value is greater than described the 3rd inductance value.
7. method as claimed in claim 6 is characterized in that: described first coupling inductance comprises a solenoid.
8. method as claimed in claim 7 is characterized in that: more comprise the value that changes described first coupling inductance by the saturated phenomenon of described solenoid.
9. method as claimed in claim 6 is characterized in that: described second coupling inductance comprises a solenoid.
10. method as claimed in claim 9 is characterized in that: more comprise the value that changes described second coupling inductance by the saturated phenomenon of described solenoid.
11. method as claimed in claim 6 is characterized in that: first coupling inductance comprises that one first inductance has described first inductance value and one second inductance has described second inductance value.
12. method as claimed in claim 11 is characterized in that: the step that described first coupling inductance is changed into one second inductance value by one first inductance value comprises described first phase current is switched to described second inductance by described first inductance.
13. method as claimed in claim 6 is characterized in that: described second coupling inductance comprises that one first inductance has described the 3rd inductance value and one second inductance has described the 4th inductance value.
14. method as claimed in claim 13 is characterized in that: the step that described second coupling inductance is changed into one the 4th inductance value by one the 3rd inductance value comprises described second phase current is switched to described second inductance by described first inductance.
15. a switched power supply that improves light load effect, it may operate in first pattern and second pattern, comprises one first coupling inductance, one second coupling inductance, and one first output stage, one second output stage and a phase difference adjuster is characterized in that:
Has coupling effect between described first coupling inductance and described second coupling inductance;
Described one first output stage is exported one first phase current through the output of described first coupling inductance to described switched power supply according to one first control signal;
Described second output stage is exported one second phase current through the output of described second coupling inductance to described switched power supply according to one second control signal; And
Described phase difference adjuster is adjusted the phase difference between described first and second control signal.
16. switched power supply as claimed in claim 15 is characterized in that: described phase difference adjuster comprise choose in the 3rd control signal of a multiplexer by a plurality of outs of phase one of them as described second control signal to change described phase difference.
17. switched power supply as claimed in claim 15 is characterized in that: described phase difference adjuster comprises that one postpones cell element in order to postpone described second control signal to change described phase difference.
18. switched power supply as claimed in claim 15 is characterized in that: described phase difference is greater than 0.
19. switched power supply as claimed in claim 15 is characterized in that: described phase difference adjuster reduces described phase difference after described switched power supply enters described second pattern by described first pattern.
20. method of improving the switched power supply light load effect, described switched power supply may operate in first pattern and second pattern, comprise one first output stage according to one first control signal export one first phase current through one first coupling inductance to the output of described switched power supply and, one second output stage is exported one second phase current through the output of one second coupling inductance to described switched power supply according to one second control signal, have coupling effect between described first and second inductance, described method comprises the following steps:
First step: during described switched power supply operates in described first pattern, regulate described first and second control signal, make to have one first phase difference between it;
Second step: when described switched power supply enters described second pattern, regulate described first and second control signal, make to have one second phase difference between it, described second phase difference is less than described first phase difference.
21. method as claimed in claim 20, it is characterized in that: regulate described first and second control signal, the step that has one second phase difference between it is comprised by choosing one of them as described second control signal in a plurality of the 3rd control signals with out of phase.
22. method as claimed in claim 20 is characterized in that: regulate described first and second control signal, the step that has one second phase difference between it is comprised postpone described second control signal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200810001461 CN101494415B (en) | 2008-01-21 | 2008-01-21 | Switching type power supply apparatus and method for improving light load efficiency |
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| CN 200810001461 CN101494415B (en) | 2008-01-21 | 2008-01-21 | Switching type power supply apparatus and method for improving light load efficiency |
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| CN101494415A true CN101494415A (en) | 2009-07-29 |
| CN101494415B CN101494415B (en) | 2013-04-17 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106469992A (en) * | 2015-08-05 | 2017-03-01 | 艾默生网络能源有限公司 | One kind prevents the magnetically saturated control method of mutual reactor and device |
| CN111446951A (en) * | 2020-05-12 | 2020-07-24 | 杰华特微电子（杭州）有限公司 | Multiphase switching circuit |
| CN113498575A (en) * | 2020-02-05 | 2021-10-12 | 华为技术有限公司 | Switch power supply |
| CN117118222A (en) * | 2023-04-28 | 2023-11-24 | 荣耀终端有限公司 | Step-down voltage conversion circuit and electronic device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100477459C (en) * | 2005-11-15 | 2009-04-08 | 华硕电脑股份有限公司 | Boosting type converter |
| EP1835604A1 (en) * | 2006-03-16 | 2007-09-19 | STMicroelectronics S.r.l. | Magnetic core for a coupled multi coil filter inductor |
-
2008
- 2008-01-21 CN CN 200810001461 patent/CN101494415B/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106469992A (en) * | 2015-08-05 | 2017-03-01 | 艾默生网络能源有限公司 | One kind prevents the magnetically saturated control method of mutual reactor and device |
| CN106469992B (en) * | 2015-08-05 | 2018-10-02 | 维谛技术有限公司 | One kind preventing the magnetically saturated control method of mutual reactor and device |
| CN113498575A (en) * | 2020-02-05 | 2021-10-12 | 华为技术有限公司 | Switch power supply |
| CN111446951A (en) * | 2020-05-12 | 2020-07-24 | 杰华特微电子（杭州）有限公司 | Multiphase switching circuit |
| CN117118222A (en) * | 2023-04-28 | 2023-11-24 | 荣耀终端有限公司 | Step-down voltage conversion circuit and electronic device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101494415B (en) | 2013-04-17 |
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