Utility model content
The purpose of this utility model is to overcome above-mentioned the deficiencies in the prior art, and a kind of single-phase high-gain booster converter is provided.
The utility model is applicable to the occasion that photovoltaic system, fuel cell system, energy-recuperation system etc. need to be used high-gain high-performance electric power electronic converter.
The utility model is achieved through the following technical solutions:
A booster converter, comprises the voltage transfer circuit, coupling inductance booster circuit and the output circuit that connect successively.
Described voltage transfer circuit comprises the first inductance, switching tube and the first electric capacity;
Described coupling inductance booster circuit comprises former limit winding and secondary winding, the second electric capacity, the 3rd electric capacity, the first diode and second diode of coupling inductance;
Described output circuit comprises the 3rd diode, the 4th electric capacity and load.
One end of described the first inductance is connected with the positive pole of input power, and the other end difference drain electrode of switching tube, one end of the first electric capacity of the first inductance connect;
The source electrode of described switching tube is connected with the negative pole of input power;
The other end of described the first electric capacity respectively with the anode of the first diode, the different name end of the former limit winding of one end of the second electric capacity, coupling inductance be connected;
The Same Name of Ends of the former limit winding of described coupling inductance is connected with the negative pole of input power;
The negative electrode of described the first diode is connected with one end of the 3rd electric capacity, the different name end of the secondary winding of coupling inductance respectively;
The other end of described the second electric capacity respectively with the anodic bonding of Same Name of Ends second diode of the secondary winding of coupling inductance;
The other end of described the 3rd electric capacity respectively with the negative electrode of the second diode, the anodic bonding of the 3rd diode;
The negative electrode of described the 3rd diode is connected with the 4th one end of electric capacity, one end of load respectively;
Described the 4th other end of electric capacity, the other end of load be connected with the negative pole of input power;
Compared with prior art the utlity model has following advantage:
(1) the utility model is without extra power switch, simple in structure, and it is convenient to control, and efficiency is high;
(2), when converter of the present utility model is worked, input current ripple is less, is convenient to input current filtering;
(3) in the process that the coupling inductance in the utility model turns on and off at switching tube, all participate in energy transmission, improved the utilance of coupling inductance;
(4) the utility model utilize simultaneously two electric capacity the second electric capacity and the 3rd electric capacity realize voltage transfer, not only realized the further expansion of voltage gain, and further improved the utilance of coupling inductance.
Embodiment
As shown in Figure 1, a kind of single-phase high-gain booster converter, comprises voltage transfer circuit X, the coupling inductance booster circuit Y and the output circuit Z that connect successively.
Described voltage transfer circuit X comprises the first inductance L
1, switching tube S and the first capacitor C
1;
Described coupling inductance booster circuit Y comprises the former limit winding L of coupling inductance
21secondary winding L with coupling inductance
22, the second capacitor C
2, the 3rd capacitor C
3, the first diode D
1with the second diode D
2;
Described output circuit comprises the 3rd diode D
3, the 4th capacitor C
4with load R.
Described the first inductance L
1one end and input power V
gpositive pole connect, the first inductance L
1the other end respectively drain electrode, the first capacitor C of switching tube S
1one end connect;
The source electrode of described switching tube S and input power V
gnegative pole connect;
Described the first capacitor C
1the other end respectively with the first diode D
1anode, the second capacitor C
2one end, the former limit winding L of coupling inductance
21different name end connect;
The former limit winding L of described coupling inductance
21same Name of Ends and input power V
gnegative pole connect;
Described the first diode D
1negative electrode respectively with the 3rd capacitor C
3one end, the secondary winding L of coupling inductance
22different name end connect;
Described the second capacitor C
2the other end respectively with the secondary winding L of coupling inductance
22same Name of Ends the second diode D
2anodic bonding;
Described the 3rd capacitor C
3the other end respectively with the second diode D
2negative electrode, the 3rd diode D
3anodic bonding;
Described the 3rd diode D
3negative electrode respectively with the 4th capacitor C
4one end of one end, load R connect;
Described the 4th capacitor C
4the other end, the other end and the input power V of load R
gnegative pole connect;
As shown in Figure 2 a and 2 b, a kind of single-phase high-gain booster converter mainly contains 2 operation modes in a switch periods, is described below respectively:
Operation mode 1:
As shown in Figure 2 a, switching tube S is open-minded, the first diode D
1, the second diode D
2conducting, the 3rd diode D
3cut-off.Input power V
ggive the first inductance L
1charging, the first inductance L
1energy storage, the first capacitor C
1by coupling inductance to the second capacitor C
2, the 3rd capacitor C
3transferring energy, the second capacitor C
2with the 3rd capacitor C
3energy storage.The 4th capacitor C
4energy is provided to load R.
Under this operation mode, related electric parameter relationship formula is:
V
L1=V
d (1)
V
L21=V
C1 (2)
V
C2=V
C3=NV
C1 (3)
Wherein, V
drepresent input supply voltage, V
l1represent the first inductance L
1both end voltage under this operation mode, V
l21the both end voltage of the magnetizing inductance of expression coupling inductance under this operation mode, V
c1, V
c2, V
c3represent respectively the first capacitor C
1, the second capacitor C
2with the 3rd capacitor C
3both end voltage, N(N>=1) represent the ratio of the former limit of coupling inductance winding and the number of turn of secondary winding.
Operation mode 2:
As shown in Figure 2 b, switching tube S disconnects, the 3rd diode D
3conducting, the first diode D
1with the second diode D
2cut-off.The first inductance L
1release energy, the second electric capacity and the 3rd capacitor C
3to output circuit, release energy simultaneously, the 4th capacitor C
4energy storage.
Under this operation mode, related electric parameter expression is:
V′
L21+V
C2+V
C3+NV′
L21=V
o (4)
V′
L1+V
d=V
C2+V′
L21 (5)
Wherein, V
orepresent output voltage, V '
l21the both end voltage of the magnetizing inductance of expression coupling inductance under this operation mode, V '
l1represent the first inductance L
1both end voltage under this operation mode.
During converter steady operation, voltage gain is analyzed:
If the switch periods of switching tube work is T
s, duty ratio is D, 1 duration of operation mode is DT
s, 2 duration of operation mode are (1-D) T
s.According to inductance weber equilibrium response, can obtain:
V
L1DT
s=V′
L1(1-D)T
s (6)
V
L21DT
s=V′
L21(1-D)T
s (7)
Simultaneous formula (1)~formula (7) can obtain:
Can output thus, the voltage gain M of a kind of single-phase high-gain booster converter described in the utility model is:
Compared with prior art the utlity model has following advantage:
The utility model is without extra power switch, simple in structure, and it is convenient to control, and efficiency is high;
During converter work of the present utility model, input current ripple is less, is convenient to input current filtering;
In the process that coupling inductance in the utility model turns on and off at switching tube, all participate in energy transmission, improved the utilance of coupling inductance;
The utility model utilizes i.e. the second capacitor C of two electric capacity simultaneously
2with the 3rd capacitor C
3realize voltage transfer, not only realized the further expansion of voltage gain, and further improved the utilance of coupling inductance.
Above-described embodiment is preferably execution mode of the utility model; but execution mode of the present utility model is not limited by the examples; other any do not deviate from change, the modification done under Spirit Essence of the present utility model and principle, substitutes, combination, simplify; all should be equivalent substitute mode, within being included in protection range of the present utility model.