CN101989818A - Two-stage switching type power conversion circuit - Google Patents
Two-stage switching type power conversion circuit Download PDFInfo
- Publication number
- CN101989818A CN101989818A CN2009101657113A CN200910165711A CN101989818A CN 101989818 A CN101989818 A CN 101989818A CN 2009101657113 A CN2009101657113 A CN 2009101657113A CN 200910165711 A CN200910165711 A CN 200910165711A CN 101989818 A CN101989818 A CN 101989818A
- Authority
- CN
- China
- Prior art keywords
- circuit
- switch
- power
- power consumption
- voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Dc-Dc Converters (AREA)
Abstract
A two-stage switching power conversion circuit for receiving an input voltage to generate an output voltage or an output current, comprising: the first stage power supply circuit comprises a first switch circuit, and the first switch circuit is switched on or switched off to generate bus voltage; the bus capacitor is connected to the power bus; the second-stage power supply circuit comprises a second switch circuit, a first capacitor and a second capacitor, wherein the second switch circuit is used for receiving the bus voltage and generating output voltage or output current to the load circuit through the on and off of the second switch circuit; and the power supply control unit is used for respectively controlling the first switch circuit and the second switch circuit to operate, controlling the voltage value of the bus voltage to dynamically change along with the power consumption of the load circuit, and controlling the second-stage power supply circuit to selectively change the operation mode of the second switch circuit according to the power consumption of the load circuit. The invention will not be interrupted or abnormal immediately when the input voltage is interrupted or abnormal, and has high operation efficiency when the electronic product has lower power consumption.
Description
Technical field
The present invention relates to a kind of power-switching circuit, relate in particular to a kind of two-stage switching power supply conversion circuit.
Background technology
In recent years along with the progress of science and technology, electronic product with difference in functionality of all kinds is developed out gradually, these electronic products with difference in functionality of all kinds have not only satisfied people's various different demands, more incorporate everyone daily life, and it is more convenient to make people live.
The electronic product of these difference in functionalitys of all kinds is made up of various electronic component, and the required supply voltage of each electronic component is not quite similar, because the AC power that electric power system now provides also is not suitable for directly offering the electronic product use.In order to provide suitable voltage to each electronic component, make its normal operation, these electronic products need be by power-switching circuit with AC power, and for example general civil power is converted to suitable voltage and uses for each electronic component.
Power-switching circuit is according to the difference of its circuit framework, can divide into two kinds of linear formula and exchange type power conversion circuits roughly approximately, simple linear formula power-switching circuit is made up of transformer, diode rectifier and capacitive filter, its advantage is that circuit is simple and cost is low, but because of using bigger transformer and conversion efficiency low, so can't use in the electronic product of or long-time use less at volume.Compared to linear formula power-switching circuit, exchange type power conversion circuit has high conversion rate and smaller volume, and therefore, the electronic product of use or miniaturization can use exchange type power conversion circuit mostly for a long time.
The tradition two-stage switching power supply conversion circuit is produced the bus voltage of fixed voltage value by first order power circuit, produce the output voltage of load voltage value again by second level power circuit reception bus voltage, use to electronic product with the output voltage that load voltage value is provided.When the AC interruptions of input or take place when unusual, the output voltage of traditional two-stage switching power supply conversion circuit can be influenced and interrupt or take place unusual, can't be maintained rated value, and simultaneously, output voltage more can change along with the power consumption of electronic product.When the power consumption of electronic product bigger, and the AC interruptions of input or take place when unusual, voltage difference is relatively large and can descend rapidly along with the increase of time between the magnitude of voltage of output voltage and the load voltage value, and the power consumption of electronic product is big more, and the magnitude of voltage decrease speed of output voltage is fast more.In addition, the second level power circuit of tradition two-stage switching power supply conversion circuit is according to the operational mode of specified output electric weight design second level power circuit, for example PWM pattern or mode of resonance etc., the second level power circuit of tradition two-stage switching power supply conversion circuit is at different output electric weight, no matter promptly the power consumption of electronic product has under the different situations, operational mode does not change.And under the changeless situation of the operational mode of second level power circuit, the efficient of second level power circuit can't maintain high operational efficiency value.In general, electronic product need be at specific power consumption during for example at specified power consumption, and second level power circuit just can have high operational efficiency.
Therefore, how to develop a kind of two-stage switching power supply conversion circuit that improves above-mentioned known technology defective, real problem for the correlative technology field solution that presses at present.
Summary of the invention
The object of the present invention is to provide a kind of two-stage switching power supply conversion circuit, make two-stage switching power supply conversion circuit interrupt or take place when unusual in input voltage, holding time of two-stage switching power supply conversion circuit can not change along with the power consumption of electronic product, and interrupt momently or take place when unusual in input voltage, output voltage can be kept rated value, can not be subjected to input voltage influence and interrupts immediately or take place unusual.In addition, two-stage switching power supply conversion circuit not only has high operational efficiency when the higher power consumption of electronic product, has high operational efficiency when the lower power consumption of electronic product equally.
For reaching above-mentioned purpose, of the present invention one than the broad sense execution mode for a kind of two-stage switching power supply conversion circuit is provided, produce output voltage or output current in order to receive input voltage, two-stage switching power supply conversion circuit comprises: first order power circuit, it comprises first switching circuit, and first order power circuit is connected in power bus, produces bus voltage in order to receive input voltage and to pass through the first switching circuit conducting or end; Bus capacitance is connected in power bus and first altogether between the reference edge, in order to store electrical energy; Second level power circuit, it comprises the second switch circuit, and second level power circuit is connected in power bus, in order to receive bus voltage and by the second switch circuit turn-on with by producing output voltage or outputing current to load circuit; And power control unit, be connected in the control end and the power bus of second switch circuit of first switching circuit, the second level power circuit of first order power circuit, in order to control the operation of first switching circuit and second switch circuit respectively, and the magnitude of voltage of controlling this bus voltage dynamically changes along with the power consumption size of load circuit, controls second level power circuit optionally changes the second switch circuit according to the power consumption size of load circuit operational mode simultaneously.
The first order power circuit of two-stage switching power supply conversion circuit of the present invention can not produce the bus voltage of fixed voltage value, and the magnitude of voltage of bus voltage can change along with the power consumption size of electronic product.In addition, the second level power circuit of two-stage switching power supply conversion circuit can optionally be changed into pulse-width-modulated mode or mode of resonance operation according to the power consumption size of electronic product, select pulse-width-modulated mode operation or the mode of resonance operation that is suitable for respectively for use in low power consumption state and non-low power consumption state, make two-stage switching power supply conversion circuit not only when the higher power consumption of electronic product, have high operational efficiency, when the lower power consumption of electronic product, have high operational efficiency equally.
Description of drawings
Fig. 1: be the circuit box schematic diagram of the two-stage switching power supply conversion circuit of preferred embodiment of the present invention.
Fig. 2: be the power consumption state and the power consumption size corresponding relation figure of the load circuit of preferred embodiment of the present invention.
Fig. 3: be the power consumption state and the power consumption size corresponding relation figure of the load circuit of another preferred embodiment of the present invention.
Fig. 4: be the bus voltage and the power consumption size corresponding relation figure of the two-stage switching power supply conversion circuit of preferred embodiment of the present invention.
Fig. 5: be the bus voltage and the power consumption size corresponding relation figure of the two-stage switching power supply conversion circuit of preferred embodiment of the present invention.
Fig. 6: be the detailed circuit schematic of the two-stage switching power supply conversion circuit of preferred embodiment of the present invention.
Fig. 7: for being the detailed circuit schematic of the two-stage switching power supply conversion circuit of another preferred embodiment of the present invention.
Fig. 8: be the detailed circuit schematic of the two-stage switching power supply conversion circuit of another preferred embodiment of the present invention.
Fig. 9: be the detailed circuit schematic of the two-stage switching power supply conversion circuit of another preferred embodiment of the present invention.
Description of reference numerals in the above-mentioned accompanying drawing is as follows:
1: two-stage switching power supply conversion circuit 11: first order power circuit
112: the first input rectification circuits of 111: the first switching circuits
114: the second input rectification circuits of 113: the first current detection circuits
116: the second current detection circuits of 115: the three switching circuits
12: second level power circuit 121: the second switch circuit
122: resonant circuit 123: output rectification circuit
124: output filter circuit 13: power control unit
131: first order control circuit 132: feedback circuit
133: second level control circuit 2: load circuit
C
Bus: bus capacitance C
r: resonant capacitance
C
O1: first output capacitance
L
1: the first boost inductance L
2: second boost inductance
L
r: resonant inductance N
r: induction coil
N
1: the first induction coil N
2: second induction coil
T
r: isolating transformer N
p: primary coil
N
s: secondary coil D
1: first diode
D
2: the second diode R
S1: first current sense resistor
R
S2: the second current sense resistor B
1: power bus
Q
1～Q
6: first～the 6th switch Q
1a～Q
6a: first end
Q
1b～Q
6b: the second end Q
a: first rectifier switch
Q
b: the second rectifier switch I
In: input current
I
o: output current I
1: first electric current
I
2: second electric current I
r: resonance current
V
In: input voltage V
Bus: bus voltage
V
f: feedback signal V
o: output voltage
V
r: resonance current detection signal V
S1: first current detection signal
V
S2: the second current detection signal V
1～V
4: first～the 4th magnitude of voltage
V
I1: the first inductive current detection signal V
I2: the second inductive current detection signal
V
A1: the first rectification input voltage V
A2: the second rectification input voltage
COM1: first is total to reference edge COM2: second is total to reference edge
P
o: the power consumption P of load circuit
1～P
5: first～the 5th power consumption
S
1: low power consumption state S
2: non-low power consumption state
V
D1: the first control signal V
D2: second control signal
V
PFC1: first pfc signal
V
PFC2: second pfc signal
V
K1: the first rectified signal V
K2: second rectified signal
Embodiment
Some exemplary embodiments that embody feature of the present invention and advantage will be described in detail in the explanation of back segment.Be understood that the present invention can have various variations on different modes, it does not depart from the scope of the present invention, and explanation wherein and the accompanying drawing usefulness that ought explain in itself, but not in order to restriction the present invention.
See also Fig. 1, it is the circuit box schematic diagram of the two-stage switching power supply conversion circuit of preferred embodiment of the present invention.Two-stage switching power supply conversion circuit 1 of the present invention is in order to receive input voltage V
InElectric energy and produce specified output voltage V
oOr output current I
oTo the load circuit 2 of electronic product, this two-stage switching power supply conversion circuit 1 comprises: first order power circuit 11, second level power circuit 12, power control unit 13 and bus capacitance C
BusWherein, first order power circuit 11 comprises first switching circuit 111, and the control end of first switching circuit 111 is connected in the first order control circuit 131 of power control unit 13, and first order power circuit 11 is connected to power bus B
1With the first order control circuit 131 of power control unit 13, in order to receive input voltage V
InElectric energy and the conducting by first switching circuit 111 with by producing bus voltage V
Bus
Second level power circuit 12 comprises second switch circuit 121, and the control end of second switch circuit 121 is connected in the second level control circuit 133 of power control unit 13, and second level power circuit 12 is connected to the second level control circuit 133 of power bus B1, load circuit 2 and power control unit 13, in order to receive bus voltage V
BusElectric energy and the conducting by second switch circuit 121 with by producing specified output voltage V
oOr output current I
oProvide to load circuit 2.Bus capacitance C
BusAn end be connected in power bus B
1, the power output end of first order power circuit 11 and the power input of second level power circuit 12, and bus capacitance C
BusThe other end be connected in the first reference edge COM1 altogether, in order to store electrical energy.
See also Fig. 2 and cooperate Fig. 1, Fig. 2 is the power consumption state and the power consumption size corresponding relation figure of the load circuit of preferred embodiment of the present invention.As shown in Figure 2, as the power consumption P of load circuit 2
oBe lower than the first power consumption P
1The time, for example 10 watts (W), power control unit 13 can judge that load circuit 2 is low power consumption state S1, the second level control circuit 133 of power control unit 13 can be controlled second switch circuit 121 with pulse width modulation (pulse width modulation) mode operation, by adjusting second switch circuit 121 ON time and the duty ratio of deadline (duty cycle), make second level power circuit 12 receive bus voltage V
BusElectric energy and produce specified output voltage V
oOr output current I
oPower consumption P when load circuit 2
oBe higher than the first power consumption P
1The time, power control unit 13 can judge that load circuit 2 is non-low power consumption state S
2The second level control circuit 133 of power control unit 13 can be controlled the second switch circuit 121 of second level power circuit 12 with resonance (resonant) mode operation, the ON time of second switch circuit 121 and the duty ratio of deadline are set at fixed value at this moment, for example 0.5, by adjusting the running frequency of second switch circuit 121, make second level power circuit 12 receive bus voltage V again
BusElectric energy, produce resonance and export specified output voltage V
oOr output current I
o
See also Fig. 3 and cooperate Fig. 1 and Fig. 2, Fig. 3 is the power consumption state and the power consumption size corresponding relation figure of the load circuit of another preferred embodiment of the present invention.Fig. 3 and Fig. 2 difference are that Fig. 3 has hysteresis phenomenon (Hysteresis), as shown in Figure 3, and when load circuit 2 is low power consumption state S
1, the power consumption P of load circuit 2
oRise and be higher than the first power consumption P
1And less than the second power consumption P
2The time, power control unit 13 can judge that load circuit 2 is low power consumption state S
1, up to the power consumption P of load circuit 2
oContinue rising and be higher than the second power consumption P
2The time, power control unit 13 can judge that just load circuit 2 changes into non-low power consumption state S
2On the contrary, when load circuit 2 be non-low power consumption state S
2, the power consumption P of load circuit 2
oDescend and be lower than the second power consumption P
2And greater than the first power consumption P
1The time, power control unit 13 can judge that load circuit 2 is non-low power consumption state S
2, up to the power consumption P of load circuit 2
oContinue decline and be lower than the first power consumption P
1The time, power control unit 13 can judge that just load circuit 2 changes into low power consumption state S
1In other words, as the power consumption P of load circuit 2
oAt the first power consumption P
1Or the second power consumption P
2Change, and variable quantity is less than the first power consumption P
1With the second power consumption P
2Difference the time, the operational mode that hysteresis phenomenon can prevent second level power circuit 12 is frequent changes too, so that two-stage switching power supply conversion circuit of the present invention 1 more stably moves.Wherein, the first power consumption P
1Equal the second power consumption P
2Can in time set, as the first power consumption P
1Equal the second power consumption P
2The time, Fig. 3 can be equal to Fig. 2, does not have hysteresis phenomenon.
See also Fig. 4 and cooperate Fig. 1, Fig. 4 is the bus voltage and the power consumption size corresponding relation figure of the two-stage switching power supply conversion circuit of preferred embodiment of the present invention.As shown in Figure 4, bus voltage V
BusMagnitude of voltage can be along with the power consumption P of load circuit 2
oSize and linear change are as the power consumption P of load circuit 2
oDuring increase, first order control circuit 131 can be controlled the ON time of first switching circuit 111 and the duty ratio of deadline, makes bus voltage V
BusMagnitude of voltage along with the power consumption P of load circuit 2
oIncrease, in the present embodiment, bus voltage V
BusMagnitude of voltage and the power consumption P of load circuit 2
oBetween be essentially a fixed proportion value, can be other functional relation linear relationship or ladder relation or the like for example in certain embodiments, can be referring to other embodiment.On the contrary, as the power consumption P of load circuit 2
oDuring minimizing, bus voltage V
BusMagnitude of voltage also can be along with the power consumption P of load circuit 2
oReduce bus voltage V in this enforcement
BusMagnitude of voltage and the power consumption P of load circuit 2
oBetween be directly proportional.
See also Fig. 5 and cooperate Fig. 1, Fig. 5 is the bus voltage and the power consumption size corresponding relation figure of the two-stage switching power supply conversion circuit of preferred embodiment of the present invention.As shown in Figure 5, bus voltage V
BusMagnitude of voltage can be along with the power consumption P of load circuit 2
oSize and phase change are as the power consumption P of load circuit 2
oLess than the 3rd power consumption P
3The time, first order control circuit 131 can make bus voltage V by the ON time of adjustment first switching circuit 111 and the duty ratio of deadline
BusBe the first magnitude of voltage V
1Power consumption P when load circuit 2
oGreater than the 3rd power consumption P
3And less than the 4th power consumption P
4The time, first order control circuit 131 can make bus voltage V by the ON time of adjustment first switching circuit 111 and the duty ratio of deadline
BusBe the second magnitude of voltage V
2Power consumption P when load circuit 2
oGreater than the 4th power consumption P
4And less than the 5th power consumption P
5The time, first order control circuit 131 can make bus voltage V by the ON time of adjustment first switching circuit 111 and the duty ratio of deadline
BusBe tertiary voltage value V
3Power consumption P when load circuit 2
oGreater than the 5th power consumption P
5The time, first order control circuit 131 can make bus voltage V by the ON time of adjustment first switching circuit 111 and the duty ratio of deadline
BusBe the 4th magnitude of voltage V
4
Generally speaking, bus voltage V
BusMagnitude of voltage can be along with the power consumption P of load circuit 2
oIncrease and increase, in the present embodiment, power control unit 13 is according to the rated output power P of two-stage switching power supply conversion circuit 1
aDivide into a plurality of power consumption interval, this a plurality of power consumption interval is respectively less than the 3rd power consumption P
3The first power consumption interval, greater than the 3rd power consumption P
3And less than the 4th power consumption P
4The second power consumption interval, greater than the 4th power consumption P
4And less than the 5th power consumption P
5The 3rd power consumption interval and greater than the 5th power consumption P
5The 4th power consumption interval, again according to the present power consumption P of load circuit 2
oInterval one of them the power consumption interval of corresponding a plurality of power consumption makes bus voltage V
BusBe the interval magnitude of voltage of setting of this power consumption.
Wherein, the rated output power P of two-stage switching power supply conversion circuit 1
a, the 3rd power consumption P
3, the 4th power consumption P
4And the 5th power consumption P
5Between magnitude relationship, be the rated output power P of two-stage switching power supply conversion circuit 1 from large to small in regular turn
a, the 3rd power consumption P
3, the 4th power consumption P
4And the 5th power consumption P
5, its relational expression is
P
a＞P
5＞P
4＞P
3。
For example, the 3rd power consumption P
3Be 1/4th of the rated output power Pa of two-stage switching power supply conversion circuit 1, its relational expression is
The 4th power consumption P
4Be 2/4ths of the rated output power Pa of two-stage switching power supply conversion circuit 1, its relational expression is
The 5th power consumption P
5Be 3/4ths of the rated output power Pa of two-stage switching power supply conversion circuit 1, its relational expression is
Similarly, bus voltage V
BusMagnitude of voltage also can be along with the power consumption P of load circuit 2
oIncrease and increase.
See also Fig. 6 and cooperate Fig. 1, Fig. 6 is the detailed circuit schematic of the two-stage switching power supply conversion circuit of preferred embodiment of the present invention.As shown in Figure 6, two-stage switching power supply conversion circuit 1 equally comprises: first order power circuit 11, second level power circuit 12 and power control unit 13, in the present embodiment, first order power circuit 11 also comprises first input rectification circuit 112, first current detection circuit 113, the first boost inductance L except comprising first switching circuit 111
1And the first diode D
1(diode), and first switching circuit 111 comprised the first switch Q
1, first current detection circuit 113 can be but not be defined as the first current sense resistor R
S1
Wherein, the output of first input rectification circuit 112 is connected in the first boost inductance L
1An end and first order control circuit 131, in order to input voltage V
InRectification and produce the first rectification input voltage V
A1, in the present embodiment, the first rectification input voltage V
A1Be input voltage V
InWaveform after the full-wave rectification.The first boost inductance L
1The other end be connected in the first diode D
1Anode tap (Anode) and the first switch Q
1The first end Q
1a, the first diode D
1Cathode terminal (Cathode) be connected in power bus B
1With bus capacitance C
Bus, the first switch Q
1The second end Q
1bWith the first current sense resistor R
S1An end connect the first current sense resistor R
S1The other end then with first altogether reference edge COM1 be connected the first switch Q
1Control end be connected with first order control circuit 131.
First order control circuit 131 meeting foundations are similar in appearance to input voltage V
InThe first rectification input voltage V of waveform
A1, the power consumption P of for example sinusoidal waveform after the rectification, and load circuit 2
oProduce the first pfc signal V Deng signal
PFC1(Power Factor Correction PFC), utilizes the first pfc signal V again
PFC1Control the first switch Q
1Conducting with end, make input current I
InCURRENT DISTRIBUTION and envelope curve (envelope curve) similar in appearance to input voltage V
InWaveform so that two-stage switching power supply conversion circuit of the present invention 1 has preferable power factor.In addition, first order control circuit 131 more can be simultaneously according to the power consumption P of load circuit 2
oAdjust the first switch Q
1ON time and the duty ratio of deadline, make bus voltage V
BusMagnitude of voltage along with the power consumption P of load circuit 2
oSize and linear change or phase change.
As the first pfc signal V
PFC1During for enabled state (enable), high potential for example, the first switch Q
1Can be according to the first pfc signal V of enabled state
PFC1Conducting makes the first rectification input voltage V
A1To the first boost inductance L
1Charging, the first boost inductance L
1First electric current I
1Can correspondingly rise, and charging current can flow through the first switch Q
1With the first current sense resistor R
S1The first current sense resistor R flows through
S1Charging current can make first current detection circuit 113 produce the first current detection signal V
S1, this first current detection signal V
S1With bus voltage V
BusProduct reflected the power consumption P of load circuit 2
o, along with power consumption P
oIncrease and increase.
On the contrary, as the first pfc signal V
PFC1During for disabled state (disable), electronegative potential for example, the first switch Q
1Can be according to the first pfc signal V of disabled state
PFC1End, make the first boost inductance L
1Via the first diode D
1To bus capacitance C
BusDischarge, the first boost inductance L
1First electric current I
1Can correspondingly descend.
In the present embodiment, first order control circuit 131 utilizes the first current detection signal V
S1With bus voltage V
BusProduct judge the power consumption P of load circuit 2
oResiding state is (as bus voltage V
BusWhen being a steady state value, the first current detection signal V
S1The power consumption P that has promptly reflected load circuit 2
o), again according to the power consumption P of load circuit 2
oThe residing state and the first rectification input voltage V
A1Signal such as waveform and adjust the first switch Q
1ON time and the duty ratio of deadline, make bus voltage V
BusMagnitude of voltage along with the power consumption P of load circuit 2
oSize and linear change or phase change.As for, bus voltage V
BusThe power consumption P of the corresponding load circuit 2 of magnitude of voltage
oRelation as mentioned above, do not repeat them here.
The second level power circuit 12 of Fig. 6 also comprises resonant circuit 122, isolating transformer T except comprising second switch circuit 121
r, output rectification circuit 123 and output filter circuit 124.In the present embodiment, second switch circuit 121 comprises the 3rd switch Q
3With the 4th switch Q
4, the 3rd switch Q wherein
3The first end Q
3aBe connected in power bus B
1With bus capacitance C
Bus, the 3rd switch Q
3The second end Q
3bBe connected in the 4th switch Q
4The first end Q
4aWith resonant circuit 122, the four switch Q
4The second end Q
4bBe connected with the first common reference edge COM1, and the 3rd switch Q
3With the 4th switch Q
4Control end be connected to second level control circuit 133, and the 3rd switch Q
3With the 4th switch Q
4The first control signal V that can produce according to second level control circuit 133 respectively
D1With the second control signal V
D2Conducting with end, make bus voltage V
BusEnergy selectivity ground via the 3rd switch Q
3Or the 4th switch Q
4Be sent to resonant circuit 122 and isolating transformer T
rPrimary coil Np (primary winding) so that isolating transformer T
rPrimary coil N
pTwo ends produce change in voltage, and isolating transformer T
rSecondary coil Ns (secondary winding) can be according to isolating transformer T
rPrimary coil N
pThe change in voltage at two ends produces induced voltage.
As the power consumption P of second level control circuit 133 according to load circuit 2
oAdjust the first control signal V
D1With the second control signal V
D2When change second switch circuit 121 moves with pulse-width-modulated mode, resonant circuit 122 and isolating transformer T
rPrimary coil N
pCan not constitute the resonance relation.At this moment, second level control circuit 133 is the running frequency of second switch circuit 121 fixedly, again by adjusting second switch circuit 121 ON time and the duty ratio of deadline, makes second level power circuit 12 receive bus voltage V
BusElectric energy and produce output voltage V
oOr output current I
o
As the power consumption P of second level control circuit 133 according to load circuit 2
oAdjust the first control signal V
D1With the second control signal V
D2When change second switch circuit 121 moves with mode of resonance, resonant circuit 122 and isolating transformer T
rPrimary coil N
pCan constitute the resonance relation.At this moment, ON time and the duty ratio of deadline that second level control circuit 133 can be set second switch circuit 121 are fixed value, for example 0.5, again by adjusting the running frequency of second switch circuit 121, make second level power circuit 12 reception bus voltage V
BusElectric energy produce resonant reactive, resonant circuit 122 can make power circuit 12 output output voltage V in the second level according to the running frequency correspondence of second switch circuit 121
oOr output current I
o
In the present embodiment, output rectification circuit 123 can be but not be defined as circuit of synchronous rectification, comprises the first rectifier switch Q
aWith the second rectifier switch Q
b, the first rectifier switch Q wherein
aBe connected in isolating transformer T
rSecondary coil N
sAn end and second altogether between the reference edge COM2, the second rectifier switch Q
bBe connected in isolating transformer T
rSecondary coil N
sThe other end and second altogether between the reference edge COM2, the first rectifier switch Q
aWith the second rectifier switch Q
bControl end be connected to second level control circuit 133.The first rectifier switch Q
aWith the second rectifier switch Q
bCan be according to the first rectified signal V of second level control circuit 133 generations
K1With the second rectified signal V
K2Conducting with end, with isolating transformer T
rSecondary coil N
sThe induced voltage rectification.
In the present embodiment, output filter circuit 124 comprises the first output capacitance C
O1, the first output capacitance C
O1An end be connected in second altogether reference edge COM2 and output rectification circuit 123, the first output capacitance C
O1The other end be connected in isolating transformer T
rSecondary coil N
sCentre cap (center-tapped), in order to the voltage filter after output rectification circuit 123 rectifications, and produce specified output voltage V
oOr output current I
oTo load circuit 2.
In the present embodiment, resonant inductance L
rInduction coil N
rCan be according to resonant inductance L
rResonance current I
rInduction produces resonance current detection signal V
r, and second level control circuit 133 utilizes resonance current detection signal V
rJudge whether second level power circuit 12 is in the state of overcurrent (OCP), thus the protective circuit operate as normal.When second level control circuit 133 is obtained feedback signal V by feedback circuit 132
fAfter, this feedback signal V
fCan make comparisons by comparator with an inner reference voltage.When underloading, this moment feedback signal V
fIf surpass reference voltage, then be judged to be the PWM pattern.When signal Xiao Yu reference voltage, then be judged to be variable mode.The power consumption P of load circuit 2
oWith corresponding power consumption state, again according to the power consumption P of load circuit 2
oOr corresponding power consumption state is adjusted the first control signal V
D1With the second control signal V
D2, make second switch circuit 121 optionally with pulse-width-modulated mode or mode of resonance operation.As for, the power consumption P of load circuit 2
o, power consumption state and second switch circuit 121 operational modes corresponding relation as mentioned above, do not repeat them here.
See also Fig. 7 and cooperate Fig. 6 and Fig. 1, Fig. 7 is the detailed circuit schematic of the two-stage switching power supply conversion circuit of another preferred embodiment of the present invention.Fig. 7 is similar to operation to the circuit framework of the two-stage switching power supply conversion circuit 1 of Fig. 6, difference is that the first order power circuit 11 of Fig. 7 also comprises second input rectification circuit 114, the 3rd switching circuit 115, second current detection circuit 116, the second boost inductance L2 and the second diode D2, in the present embodiment, the 3rd switching circuit 115 is by second switch Q
2Constitute, second current detection circuit 116 can be but not be defined as the second current sense resistor R
S2, and second input rectification circuit 114 comprises the 3rd diode D
3With the 4th diode D
4
Wherein, the 3rd diode D
3Anode tap be connected in an end of the input side of first input rectification circuit 112, the 3rd diode D
3Cathode terminal be connected in the 4th diode D
4Cathode terminal and first order control circuit 131, the four diode D
4Anode tap be connected in the other end of the input side of first input rectification circuit 112, the 4th diode D
4Cathode terminal be connected in the 3rd diode D
3Cathode terminal and first order control circuit 131, by the 3rd diode D
3With the 4th diode D
4With input voltage V
InRectification and produce the second rectification input voltage V
A2In the present embodiment, the second rectification input voltage V
A2Be input voltage V
InWaveform after the full-wave rectification.
As for, the second switch Q of the 3rd switching circuit 115
2, second current detection circuit 116 the second current sense resistor R
S2, the second boost inductance L
2And second diode D2 between annexation and operation similar in appearance to the first switch Q of first switching circuit 111
1, first current detection circuit 113 the first current sense resistor R
S1, the first boost inductance L
1And the first diode D
1The second boost inductance L
2An end be connected in the output and the first boost inductance L of first input rectification circuit 112
1An end, the second boost inductance L
2The other end be connected in the second diode D
2Anode tap and second switch Q
2The first end Q
2aThe second diode D
2Cathode terminal be connected in power bus B
1, bus capacitance C
BusWith the first diode D
1Cathode terminal, second switch Q
2The second end Q
2bWith the second current sense resistor R
S2An end connect the second current sense resistor R
S2The other end then with first altogether reference edge COM1 be connected second switch Q
2Control end be connected with first order control circuit 131.
In the present embodiment, first order control circuit 131 is that compared to first order control circuit 131 differences of Fig. 6 the first order control circuit 131 of Fig. 7 is connected in the output of second input rectification circuit 114, and is not according to the first rectification input voltage V
A1And the power consumption P of load circuit 2
oProduce the first pfc signal V
PFC1, but foundation is similar in appearance to input voltage V
InThe second rectification input voltage V of waveform
A2And the power consumption P of load circuit 2
oProduce the first pfc signal V Deng signal
PFC1With the second pfc signal V
PFC2The first pfc signal V
PFC1With the second pfc signal V
PFC2Can make the first switch Q
1With second switch Q
2Continue or staggered conducting (the first switch Q for example
1With second switch Q
2Staggered a certain angle is spent conductings etc. as 180), and input current I
InCURRENT DISTRIBUTION and envelope curve similar in appearance to input voltage V
InWaveform so that two-stage switching power supply conversion circuit of the present invention 1 has preferable power factor.Similarly, first order control circuit 13 1 more can be simultaneously according to the power consumption P of load circuit 2
oAdjust the first switch Q
1With the ON time of second switch Q2 and the duty ratio of deadline, make bus voltage V
BusMagnitude of voltage along with the power consumption P of load circuit 2
oSize and linear change or phase change.Because the second rectification input voltage V
A2Equally similar in appearance to input voltage V
InWaveform, so first order control circuit 131 is according to the second rectification input voltage V
A2Or according to the first rectification input voltage V
A1Can have essentially identical effect.
The first pfc signal V
PFC1With the second pfc signal V
PFC2Can continue or interlock is enabled state, and correspondence makes the first switch Q
1With second switch Q
2Continue or staggered conducting.As the first pfc signal V
PFC1During for enabled state, the second pfc signal V
PFC2Can correspond to disabled state, the first switch Q
1Can be according to the first pfc signal V of enabled state
PFC1Conducting makes the first rectification input voltage V
A1To the first boost inductance L
1Charging, the first boost inductance L
1First electric current I
1Can correspondingly rise, and charging current can flow through the first switch Q
1With the first current sense resistor R
S1The first current sense resistor R flows through
S1Charging current can make first current detection circuit 113 produce the first current detection signal V
S1, this first current detection signal V
S1The power consumption P of size and load circuit 2
oCan be directly proportional, along with power consumption P
oIncrease and increase.On the contrary, this moment second switch Q
2Can be according to the second pfc signal V of disabled state
PFC2End, make the second boost inductance L
2Via the second diode D
2To bus capacitance C
BusDischarge, the second boost inductance L
2Second electric current I
2Can correspondingly descend.
Similarly, as the second pfc signal V
PFC2During for enabled state, the first pfc signal V
PFC1Can correspond to disabled state, second switch Q
2Can be according to the second pfc signal V of enabled state
PFC2Conducting makes the first rectification input voltage V
A1To the second boost inductance L
2Charging, the second boost inductance L
2Second electric current I
2Can correspondingly rise, and charging current can flow through second switch Q
2With the second current sense resistor R
S2The second current sense resistor R flows through
S2Charging current can make second current detection circuit 116 produce the second current detection signal V
S2, this second current detection signal V
S2The power consumption P of size and load circuit 2
oCan be directly proportional, along with power consumption P
oIncrease and increase.On the contrary, this moment the first switch Q
1Can be according to the first pfc signal V of disabled state
PFC1End, make the first boost inductance L
1Via the first diode D
1To bus capacitance C
BusDischarge, the first boost inductance L
1First electric current I
1Can correspondingly descend.
In the present embodiment, first order control circuit 131 utilizes the first current detection signal V simultaneously
S1With the second current detection signal V
S2Summation after with bus voltage V
BusProduct judge the power consumption P of load circuit 2
oResiding state is again according to the power consumption P of load circuit 2
oResiding state and similar in appearance to input voltage V
InThe second rectification input voltage V of waveform
A2Waveform and adjust the first switch Q respectively
1With second switch Q
2ON time and the duty ratio of deadline, make bus voltage V
BusMagnitude of voltage along with the power consumption P of load circuit 2
oSize and linear change or phase change.As for, bus voltage V
BusThe power consumption P of the corresponding load circuit 2 of magnitude of voltage
oRelation as mentioned above, do not repeat them here.
Because, the first pfc signal V in the present embodiment
PFC1With the second pfc signal V
PFC2Can not be enabled state simultaneously, make the first switch Q relatively
1With second switch Q
2Not conducting simultaneously, the first switch Q
1With second switch Q
2Continue in the different time interval or interlock conducting.So in same time interval, the input current I of Fig. 7
InCurrent value less relatively, be scattered in the different time interval, make the input current I of Fig. 7
InCURRENT DISTRIBUTION and envelope curve compared to the input current I of Fig. 6
InCURRENT DISTRIBUTION and envelope curve more similar in appearance to input voltage V
InWaveform.
In addition, utilize the first switch Q
1With second switch Q
2Two switch operations are so the two-stage switching power supply conversion circuit 1 of Fig. 7 can provide bigger output electric weight.And the first switch Q
1With second switch Q
2Continue or the conducting operation that interlocks in the different time interval, make the switch Q that wins
1, second switch Q
2, the first current sense resistor R
S1, the second current sense resistor R
S2, the first boost inductance L
1, the second boost inductance L
2, the first diode D
1And the second diode D
2Operating temperature lower so that two-stage switching power supply conversion circuit of the present invention 1 can long-play.
See also Fig. 8 and cooperate Fig. 7 and Fig. 1, Fig. 8 is the detailed circuit schematic of the two-stage switching power supply conversion circuit of another preferred embodiment of the present invention.Fig. 8 is similar to operation to the circuit framework of the two-stage switching power supply conversion circuit 1 of Fig. 7, and difference is that the second switch circuit 121 of Fig. 8 also comprises the 5th switch Q
5With the 6th switch Q
6, promptly the switching circuit 121 of the half-bridge structure from Fig. 7 becomes the full bridge structure among Fig. 8.In the present embodiment, the 5th switch Q
5With the 6th switch Q
6Annexation is similar in appearance to the 3rd switch Q
3With the 4th switch Q
4, wherein, the 5th switch Q
5The first end Q
5aBe connected in power bus B
1, bus capacitance C
BusWith the 3rd switch Q
3The first end Q
3a, the 5th switch Q
5The second end Q
5bBe connected in the 6th switch Q
6The first end Q
6a, and via resonant circuit 122 and isolating transformer T
rPrimary coil N
pConnect the 6th switch Q
6The second end Q
6bBe connected with the first common reference edge COM1, and the 5th switch Q
5With the 6th switch Q
6Control end be connected to second level control circuit 133.
In the present embodiment, the 3rd switch Q
3With the 6th switch Q
6Simultaneously according to the first control signal V
D1Conducting with end and the 4th switch Q
4With the 5th switch Q
5Simultaneously according to the second control signal V
D2Conducting with end and the first control signal V
D1With the second control signal V
D2Can not be enabled state simultaneously, make the 3rd switch Q relatively
3With the 4th switch Q
4Not conducting simultaneously, and the 6th switch Q
6With the 5th switch Q
5Also not conducting simultaneously.
Similarly, second level control circuit 133 can utilize the first control signal V
D1With the second control signal V
D2Control the 3rd switch Q
3, the 4th switch Q
4, the 5th switch Q
5With the 6th switch Q
6Conducting with end, make bus voltage V
BusEnergy selectivity ground via the 3rd switch Q
3, the 4th switch Q
4, the 5th switch Q
5With the 6th switch Q
6Be sent to resonant circuit 122 and isolating transformer T
rPrimary coil N
p, so that isolating transformer T
rPrimary coil N
pTwo ends produce change in voltage, and isolating transformer T
rSecondary coil N
sThe corresponding induced voltage that produces.As for, the power consumption P of load circuit 2
o, power consumption state and second switch circuit 121 operational modes corresponding relation as mentioned above, do not repeat them here.
See also Fig. 9 and cooperate Fig. 7 and Fig. 1, Fig. 9 is the detailed circuit schematic of the two-stage switching power supply conversion circuit of another preferred embodiment of the present invention.Fig. 9 is similar to operation to the circuit framework of the two-stage switching power supply conversion circuit 1 of Fig. 7, and difference is the first boost inductance L of the first order power circuit 11 of Fig. 9
1With the second boost inductance L
2Comprise the first induction coil N more respectively
1With the second induction coil N
2, and the first boost inductance L
1The first induction coil N
1With the second boost inductance L
2The second induction coil N
2Be connected to first order control circuit 131.
Wherein, the first boost inductance L
1The first induction coil N
1Can be according to the first boost inductance L
1First electric current I
1Can corresponding induction produce the first inductive current detection signal V
I1, and the second boost inductance L
2The second induction coil N
2Can be according to the second boost inductance L
2Second electric current I
2Can corresponding induction produce the second inductive current detection signal V
I2First order control circuit 131 is except utilizing the first inductive current detection signal V
I1With the second inductive current detection signal V
I2Judge the first boost inductance L
1First electric current I
1With the second boost inductance L
2Second electric current I
2Outward, for example according to detection signal V
I1With V
I2Judge first electric current I
1With second electric current I
2Thereby state make the working method of circuit working in boundary scheme, more can utilize the first inductive current detection signal V
I1With the second inductive current detection signal V
I2Judge the power consumption P of load circuit 2
oAs for, bus voltage V
BusThe power consumption P of the corresponding load circuit 2 of magnitude of voltage
oRelation as mentioned above, do not repeat them here.
The first order power circuit 11 and the second level power circuit 12 of two-stage switching power supply conversion circuit 1 of the present invention have numerous embodiments, for example, first order power circuit 11 can be boost type (Boost), buck (Buck) or step-down/up type (Buck-boost), and second level power circuit 12 can be inductance inductance and capacitance type (LLC) resonant circuit or inductance capacitance condenser type (LCC) resonant circuit, does not exceed with the above-mentioned execution mode that exemplifies.
The first order control circuit 131 and the second level control circuit 133 of power control unit 13 of the present invention can be but not be defined as Pwm controller (pulse width modulation controller, PWM controller), pulse frequency modulated controller (pulse frequency modulation controller, PFM controller) or digital signal processor (digital signal processor, DSP).In certain embodiments, first order control circuit 131 and second level control circuit 133 more can be integrated into Pwm controller, pulse frequency modulated controller or the digital signal processor of one chip.
The first switch Q of the present invention
1, second switch Q
2, the 3rd switch Q
3, the 4th switch Q
4, the 5th switch Q
5, the 6th switch Q
6, the first rectifier switch Q
aAnd the second rectifier switch Q
bCan be but be not defined as bipolar junction transistor (Bipolar Junction Transistor, BJT) or mos field effect transistor (Metal-Oxide-Semiconductor Field-Effect Transistor, MOSFET).
In sum, the first order power circuit of two-stage switching power supply conversion circuit of the present invention can not produce the bus voltage of fixed voltage value, and the magnitude of voltage of bus voltage can change along with the power consumption size of electronic product.In addition, the second level power circuit of two-stage switching power supply conversion circuit can optionally be changed into pulse-width-modulated mode or mode of resonance operation according to the power consumption size of electronic product, select pulse-width-modulated mode operation or the mode of resonance operation that is suitable for respectively for use in low power consumption state and non-low power consumption state, make two-stage switching power supply conversion circuit not only when the higher power consumption of electronic product, have high operational efficiency, when the lower power consumption of electronic product, have high operational efficiency equally.
The present invention must be appointed by those of ordinary skills and executes that the craftsman thinks and be to modify as all, right neither scope of taking off as the desire protection of attached claim institute.
Claims (28)
1. a two-stage switching power supply conversion circuit produces an output voltage or an output current in order to receive an input voltage, and this two-stage switching power supply conversion circuit comprises:
One first order power circuit, it comprises one first switching circuit, and this first order power circuit is connected in a power bus, in order to receive this input voltage and by this first switching circuit conducting or by producing a bus voltage;
One bus capacitance is connected in this power bus and one first altogether between the reference edge, in order to store electrical energy;
One second level power circuit, it comprises a second switch circuit, and this second level power circuit is connected in this power bus, in order to receive this bus voltage and by this second switch circuit turn-on with maybe this outputs current to a load circuit by producing this output voltage; And
One power control unit, be connected in control end and this power bus of this second switch circuit of this first switching circuit, this second level power circuit of this first order power circuit, in order to control the operation of this first switching circuit and this second switch circuit respectively, and the magnitude of voltage of controlling this bus voltage dynamically changes along with the power consumption size of this load circuit, controls this second level power circuit optionally changes this second switch circuit according to the power consumption size of this load circuit operational mode simultaneously.
2. two-stage switching power supply conversion circuit as claimed in claim 1, this power control unit judges that according to the power consumption of this load circuit this load circuit is a low power consumption state and a non-low power consumption state.
3. two-stage switching power supply conversion circuit as claimed in claim 2, wherein the operational mode of this second switch circuit comprises a pulse-width-modulated mode or a mode of resonance.
4. two-stage switching power supply conversion circuit as claimed in claim 3, when this load circuit is this low power consumption state, this power control unit makes this second switch circuit with this pulse-width-modulated mode operation by adjusting the duty ratio of this second switch circuit turn-on time and deadline.
5. two-stage switching power supply conversion circuit as claimed in claim 3, when this load circuit for should be non-during the low power consumption state, this load circuit makes this second switch circuit move with mode of resonance by the running frequency of this second switch circuit of adjustment.
6. two-stage switching power supply conversion circuit as claimed in claim 2, when the power consumption of this load circuit was lower than one first power consumption, this power control unit judged that this load circuit is this low power consumption state.
7. two-stage switching power supply conversion circuit as claimed in claim 6, when the power consumption of this load circuit was higher than one second power consumption, this power control unit judged that this load circuit is this non-low power consumption state.
8. two-stage switching power supply conversion circuit as claimed in claim 7, when this first power consumption equals this second power consumption, this power control unit judges do not have hysteresis phenomenon, and when this first power consumption was not equal to this second power consumption, this power control unit judged to have hysteresis phenomenon.
9. two-stage switching power supply conversion circuit as claimed in claim 1, wherein the magnitude of voltage of this bus voltage is directly proportional with the power consumption of this load circuit.
10. two-stage switching power supply conversion circuit as claimed in claim 9 is essentially the fixed proportion value between the magnitude of voltage of this bus voltage and the power consumption of this load circuit.
11. two-stage switching power supply conversion circuit as claimed in claim 1, wherein the magnitude of voltage of this bus voltage along with the power consumption size of this load circuit linear change or phase change.
12. two-stage switching power supply conversion circuit as claimed in claim 11, wherein this power control unit is divided into a plurality of power consumption interval according to the rated output power of this two-stage switching power supply conversion circuit, and interval one of them the power consumption interval of the corresponding described a plurality of power consumption of power consumption according to this load circuit makes this bus voltage be the interval magnitude of voltage of setting of this power consumption.
13. two-stage switching power supply conversion circuit as claimed in claim 12, wherein said a plurality of power consumption interval is respectively one first power consumption interval less than one the 3rd power consumption in regular turn, greater than the 3rd power consumption and less than one second power consumption interval of one the 4th power consumption, greater than the 4th power consumption and interval and greater than one the 4th power consumption interval of the 5th power consumption less than one the 3rd power consumption of one the 5th power consumption, and this first power consumption interval, this second power consumption interval, the 3rd power consumption interval and the 4th power consumption interval make the magnitude of voltage of this bus voltage correspond to one first magnitude of voltage respectively, one second magnitude of voltage, one tertiary voltage value and one the 4th magnitude of voltage.
14. two-stage switching power supply conversion circuit as claimed in claim 1, wherein this first order power circuit also comprises:
One first input rectification circuit is in order to produce one first rectification input voltage with this input voltage rectification;
One first boost inductance, an end of this first boost inductance is connected with this first input rectification circuit, and the other end of this first boost inductance is connected with this first switching circuit;
One first diode, the anode tap of this first diode are connected in the other end and this first switching circuit of this first boost inductance, and the cathode terminal of this first diode is connected with this power bus; And
One first current detection circuit is connected between this first switching circuit and this first common reference edge corresponding one first current detection signal that produces in order to the charging current that detects this first boost inductance;
Wherein, this first switching circuit comprises one first switch, first end of this first switch is connected in the anode tap of this first diode and the other end of this first boost inductance, second end of this first switch is connected with this first current detection circuit, and the control end of this first switch is connected with this power control unit.
15. two-stage switching power supply conversion circuit as claimed in claim 14, wherein this first current detection circuit is one first current sense resistor.
16. two-stage switching power supply conversion circuit as claimed in claim 15, wherein this first order power circuit also comprises:
One second input rectification circuit is in order to produce one second rectification input voltage with this input voltage rectification;
One second boost inductance, an end of this second boost inductance is connected with this first input rectification circuit;
One second diode, the anode tap of this second diode is connected in the other end of this second boost inductance, and the cathode terminal of this first diode is connected with this power bus;
One the 3rd switching circuit comprises a second switch, and first end of this second switch is connected in the anode tap of this second diode and the other end of this second boost inductance, and the control end of this second switch is connected with this power control unit; And
One second current detection circuit is connected between the 3rd switching circuit and this first common reference edge corresponding one second current detection signal that produces in order to the charging current that detects this second boost inductance;
Wherein, this power control unit is controlled this first switching circuit and the 3rd switching circuit and is continued or interlock conducting.
17. two-stage switching power supply conversion circuit as claimed in claim 16, wherein this second current detection circuit is one second current sense resistor.
18. two-stage switching power supply conversion circuit as claimed in claim 1, wherein this second level power circuit also comprises:
One resonant circuit is connected with this second switch circuit;
One isolating transformer, the primary coil of this isolating transformer is connected with this resonant circuit;
One output rectification circuit is connected with the secondary coil of this isolating transformer, in order to rectification; And
One output filter circuit is connected between this output rectification circuit and this load circuit.
19. two-stage switching power supply conversion circuit as claimed in claim 18, wherein this second switch circuit comprises:
One the 3rd switch, first end of the 3rd switch is connected in this power bus, and the control end of the 3rd switch is connected with this power control unit; And
One the 4th switch, first end of the 4th switch are connected in second end and this resonant circuit of the 3rd switch, and second end of the 4th switch is connected with this first common reference edge, and the control end of the 4th switch is connected with this power control unit;
Wherein, this power control unit is controlled the 3rd switch and the 4th switch conduction respectively and is ended, and makes the energy selectivity ground of this bus voltage be sent to the primary coil of this resonant circuit and this isolating transformer via the 3rd switch or the 4th switch.
20. two-stage switching power supply conversion circuit as claimed in claim 18, wherein this second switch circuit comprises:
One the 5th switch, first end of the 5th switch is connected in first end of this power bus and the 3rd switch, and the control end of the 5th switch is connected with this power control unit;
One the 6th switch, first end of the 6th switch is connected in second end of the 5th switch and the primary coil of this isolating transformer, and second end of the 6th switch is connected with this first common reference edge, and the control end of the 6th switch is connected with this power control unit;
Wherein, this power control unit control respectively the 3rd switch, the 4th open, the 5th open and the 6th switch conduction with end, the energy selectivity ground that makes this bus voltage is opened, the 5th is opened and the 6th switch is sent to the primary coil of this resonant circuit and this isolating transformer via the 3rd switch, the 4th.
21. two-stage switching power supply conversion circuit as claimed in claim 18, wherein this resonant circuit comprises a resonant inductance and a resonant capacitance, and this resonant inductance and this resonant capacitance are connected in series between the primary coil of this second switch circuit and this isolating transformer, and this resonant circuit optionally constitutes the resonance relation according to the operational mode of this second switch circuit, so that the magnitude of voltage at the primary coil two ends of this isolating transformer produces change in voltage.
22. two-stage switching power supply conversion circuit as claimed in claim 21, wherein this resonant circuit also comprises one and is connected in this power control unit with the induction coil of this resonant inductance coupling, produce a resonance current detection signal in order to the resonance current induction according to this resonant inductance, this power control unit system utilizes this resonance current detection signal to judge whether this second level power circuit is in the state of overcurrent.
23. two-stage switching power supply conversion circuit as claimed in claim 18, wherein this output rectification circuit is a circuit of synchronous rectification, and it comprises:
One first rectifier switch, an end and one second that is connected in the secondary coil of this isolating transformer is total between the reference edge;
One second rectifier switch is connected in the other end of secondary coil of this isolating transformer and this second altogether between the reference edge;
Wherein, the control end of this first rectifier switch and this second rectifier switch is connected to this power control unit, this power control unit is by controlling this first rectifier switch and this second rectifier switch conducting and ending, with the induced voltage rectification of the secondary coil of this isolating transformer.
24. two-stage switching power supply conversion circuit as claimed in claim 18, wherein this output filter circuit comprises one first output capacitance, one end of this first output capacitance is connected in this output rectification circuit, the other end of this first output capacitance is connected in the centre cap of the secondary coil of this isolating transformer, in order to the voltage filter after this output rectification circuit rectification, maybe this outputs current to load circuit and produce this specified output voltage.
25. two-stage switching power supply conversion circuit as claimed in claim 1, wherein this power control unit comprises:
One first order control circuit, be connected in control end and this power bus of this first switching circuit, control this first switching circuit operation in order to produce at least one first pfc signal, the magnitude of voltage of this bus voltage is dynamically changed along with the power consumption size of this load circuit;
One feedback circuit is connected in the power output end of this second level power circuit, produces a corresponding feedback signal in order to this output voltage or this output current according to this second level power circuit; And
One second level control circuit, be connected in control end and this feedback circuit of this second switch circuit, control this second switch circuit operation in order to produce at least one first control signal according to this feedback signal, and adjust this first control signal optionally to change the operational mode of this second switch circuit according to the power consumption size of this load circuit.
26. two-stage switching power supply conversion circuit as claimed in claim 25, wherein this first order control circuit and this second level control circuit are Pwm controller, pulse frequency modulated controller or digital signal processor.
27. two-stage switching power supply conversion circuit as claimed in claim 1, wherein this first order power circuit is boost type, buck or step-down/up type.
28. two-stage switching power supply conversion circuit as claimed in claim 1, wherein this second level power circuit is LLC resonant circuit or LCC resonant circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101657113A CN101989818A (en) | 2009-08-06 | 2009-08-06 | Two-stage switching type power conversion circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101657113A CN101989818A (en) | 2009-08-06 | 2009-08-06 | Two-stage switching type power conversion circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101989818A true CN101989818A (en) | 2011-03-23 |
Family
ID=43746208
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009101657113A Pending CN101989818A (en) | 2009-08-06 | 2009-08-06 | Two-stage switching type power conversion circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101989818A (en) |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103414321A (en) * | 2013-08-14 | 2013-11-27 | 崇贸科技股份有限公司 | Digital Control Circuits for Power Converters |
| CN103856079A (en) * | 2012-11-28 | 2014-06-11 | 台达电子企业管理（上海）有限公司 | Switching power-conversion circuit and power supply device for the same |
| CN104052297A (en) * | 2013-03-15 | 2014-09-17 | 通用电气公司 | Methods And Systems For Improving Load Transient Response In Llc Converters |
| US9331565B2 (en) | 2010-07-14 | 2016-05-03 | Delta Electronics (Shanghai) Co., Ltd. | Switching power conversion circuit and power supply using same |
| CN107769519A (en) * | 2016-08-19 | 2018-03-06 | 半导体元件工业有限责任公司 | The control circuit and control method of power inverter |
| CN108418433A (en) * | 2018-03-29 | 2018-08-17 | 深圳驿普乐氏科技有限公司 | A kind of LLC resonant converter and its control circuit, resonant current sampling circuit |
| CN109687720A (en) * | 2018-11-23 | 2019-04-26 | 南京航空航天大学 | A kind of wide input voltage range resonant type converter apparatus and its control method |
| CN110572058A (en) * | 2018-06-05 | 2019-12-13 | 伟训科技股份有限公司 | Power Supplies with Extended Holdup Time |
| CN110971134A (en) * | 2019-12-19 | 2020-04-07 | 南京微盟电子有限公司 | Rectifier diode voltage drop compensation system of non-isolated switch power supply |
| CN110994970A (en) * | 2019-12-31 | 2020-04-10 | 中山市鹰飞电器有限公司 | Energy-saving charger based on synchronous rectification technology |
| TWI742997B (en) * | 2021-02-08 | 2021-10-11 | 台達電子工業股份有限公司 | Soft-switching power converter |
| CN114204816A (en) * | 2020-09-02 | 2022-03-18 | 广州贵冠科技有限公司 | High Conversion Efficiency LLC Resonant Converter |
| CN114825922A (en) * | 2022-03-31 | 2022-07-29 | 福建星云电子股份有限公司 | Flexibly configured switch linear composite power supply control method |
| CN114902521A (en) * | 2019-12-30 | 2022-08-12 | Oppo广东移动通信有限公司 | Power supply device and charging control method |
| CN116582003A (en) * | 2023-07-11 | 2023-08-11 | 恩赛半导体(成都)有限公司 | Zero-voltage switching two-stage power supply circuit, power supply system and control method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5905369A (en) * | 1996-10-17 | 1999-05-18 | Matsushita Electric Industrial Co., Ltd. | Variable frequency switching of synchronized interleaved switching converters |
| US6028776A (en) * | 1997-07-31 | 2000-02-22 | Samsung Electro-Mechanics Co. Ltd. | Power factor correction converter |
| CN1523746A (en) * | 2003-09-03 | 2004-08-25 | 浙江大学 | Three-level LLC series resonant DC/DC converter |
| US20080130322A1 (en) * | 2006-12-01 | 2008-06-05 | Artusi Daniel A | Power system with power converters having an adaptive controller |
| US20090121675A1 (en) * | 2007-11-09 | 2009-05-14 | City University Of Hong Kong | Electronic control method for a planar inductive battery charging apparatus |
-
2009
- 2009-08-06 CN CN2009101657113A patent/CN101989818A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5905369A (en) * | 1996-10-17 | 1999-05-18 | Matsushita Electric Industrial Co., Ltd. | Variable frequency switching of synchronized interleaved switching converters |
| US6028776A (en) * | 1997-07-31 | 2000-02-22 | Samsung Electro-Mechanics Co. Ltd. | Power factor correction converter |
| CN1523746A (en) * | 2003-09-03 | 2004-08-25 | 浙江大学 | Three-level LLC series resonant DC/DC converter |
| US20080130322A1 (en) * | 2006-12-01 | 2008-06-05 | Artusi Daniel A | Power system with power converters having an adaptive controller |
| US20090121675A1 (en) * | 2007-11-09 | 2009-05-14 | City University Of Hong Kong | Electronic control method for a planar inductive battery charging apparatus |
Non-Patent Citations (1)
| Title |
|---|
| 张伟东等: "《一种多模式AC/DC控制芯片的设计》", 《江南大学学报（自然科学版）》 * |
Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9331565B2 (en) | 2010-07-14 | 2016-05-03 | Delta Electronics (Shanghai) Co., Ltd. | Switching power conversion circuit and power supply using same |
| CN103856079A (en) * | 2012-11-28 | 2014-06-11 | 台达电子企业管理（上海）有限公司 | Switching power-conversion circuit and power supply device for the same |
| CN103856079B (en) * | 2012-11-28 | 2017-02-08 | 台达电子企业管理（上海）有限公司 | Switching power-conversion circuit and power supply device for the same |
| CN104052297A (en) * | 2013-03-15 | 2014-09-17 | 通用电气公司 | Methods And Systems For Improving Load Transient Response In Llc Converters |
| CN104052297B (en) * | 2013-03-15 | 2017-12-08 | 通用电气公司 | For improving the method and system of the response of the load transient in LLC converter |
| CN103414321A (en) * | 2013-08-14 | 2013-11-27 | 崇贸科技股份有限公司 | Digital Control Circuits for Power Converters |
| CN107769519A (en) * | 2016-08-19 | 2018-03-06 | 半导体元件工业有限责任公司 | The control circuit and control method of power inverter |
| CN108418433A (en) * | 2018-03-29 | 2018-08-17 | 深圳驿普乐氏科技有限公司 | A kind of LLC resonant converter and its control circuit, resonant current sampling circuit |
| CN110572058B (en) * | 2018-06-05 | 2021-04-23 | 东莞东骅电子科技有限公司 | Power supply capable of prolonging holding time |
| CN110572058A (en) * | 2018-06-05 | 2019-12-13 | 伟训科技股份有限公司 | Power Supplies with Extended Holdup Time |
| CN109687720A (en) * | 2018-11-23 | 2019-04-26 | 南京航空航天大学 | A kind of wide input voltage range resonant type converter apparatus and its control method |
| CN110971134A (en) * | 2019-12-19 | 2020-04-07 | 南京微盟电子有限公司 | Rectifier diode voltage drop compensation system of non-isolated switch power supply |
| CN110971134B (en) * | 2019-12-19 | 2021-06-22 | 南京微盟电子有限公司 | Rectifier diode voltage drop compensation system of non-isolated switch power supply |
| CN114902521A (en) * | 2019-12-30 | 2022-08-12 | Oppo广东移动通信有限公司 | Power supply device and charging control method |
| CN110994970A (en) * | 2019-12-31 | 2020-04-10 | 中山市鹰飞电器有限公司 | Energy-saving charger based on synchronous rectification technology |
| CN114204816A (en) * | 2020-09-02 | 2022-03-18 | 广州贵冠科技有限公司 | High Conversion Efficiency LLC Resonant Converter |
| CN114204816B (en) * | 2020-09-02 | 2024-12-10 | 广州贵冠科技有限公司 | LLC resonant converter with high conversion efficiency |
| TWI742997B (en) * | 2021-02-08 | 2021-10-11 | 台達電子工業股份有限公司 | Soft-switching power converter |
| CN114825922A (en) * | 2022-03-31 | 2022-07-29 | 福建星云电子股份有限公司 | Flexibly configured switch linear composite power supply control method |
| CN116582003A (en) * | 2023-07-11 | 2023-08-11 | 恩赛半导体(成都)有限公司 | Zero-voltage switching two-stage power supply circuit, power supply system and control method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101989818A (en) | Two-stage switching type power conversion circuit | |
| TWI393337B (en) | Two stage switching power conversion circuit | |
| JP5369279B2 (en) | Cascaded PFC and resonant mode power converter | |
| US7848117B2 (en) | Control arrangement for a resonant mode power converter | |
| CN101588135B (en) | resonant power factor correction converter | |
| CN101657957B (en) | Cascaded PFC and resonant mode power converters | |
| US5790389A (en) | Consolidated soft-switching AC/DC converters | |
| CN106533209B (en) | Hybrid boost-bypass converter in two-stage converter and power converter | |
| CN103580470B (en) | For the mixed self-adapting power factor correction scheme of switching power converter | |
| US20160105095A1 (en) | Pfc shutdown circuit for light load | |
| EP2081288A1 (en) | Control unit for a resonant power converter | |
| CN101494413A (en) | Cascaded pfc and resonant mode power converters | |
| Liu et al. | Buck-type single-switch integrated PFC converter with low total harmonic distortion | |
| CN101588139A (en) | High power factor isolated buck-type power factor correction converter | |
| CN104682745A (en) | Isolated voltage conversion circuit, control circuit and control method thereof | |
| TW201524095A (en) | Power factor correction circuit of power converter | |
| CN101834527A (en) | Two-stage switching power conversion circuit | |
| CN111835208B (en) | Switching power supply with PFC circuit | |
| CN204517684U (en) | Isolated voltage conversion circuit and control circuit | |
| Ye et al. | Peak current control of multichannel LED driver with selective dimming | |
| US20240275273A1 (en) | Multi-mode pfc circuit and control method thereof | |
| KR100966966B1 (en) | Dc/dc converter with multi-output | |
| JP7352327B1 (en) | Resonant current controlled DC power supply | |
| KR100966965B1 (en) | Multi-Output DC / DC Converters | |
| CN104702092B (en) | Power Factor Correction Circuits for Power Converters |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20110323 |