CN102394553B - Modulation method and device of double-Buck circuit - Google Patents
Modulation method and device of double-Buck circuit Download PDFInfo
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- CN102394553B CN102394553B CN201110379531.2A CN201110379531A CN102394553B CN 102394553 B CN102394553 B CN 102394553B CN 201110379531 A CN201110379531 A CN 201110379531A CN 102394553 B CN102394553 B CN 102394553B
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Abstract
The invention provides a modulation method and device of a double-Buck circuit. According to the invention, a mode C and a mode D present in the first half period and second half period of a modulation wave at intervals, which can effectively offset the voltage fluctuation generated on a first capacitor C1 and a second capacitor C2 in the double-Buck circuit when in the mode C and the mode D; and the continuous discharge and charge times of C1 and C2 as well as L1 and L2 are short, thereby greatly reducing the end voltage fluctuation of C1 and C2 as well as L1 and L2, reducing the ripple wave of the output voltage and improving output wave forms. In the prior art, the mode C continuously presents in the first half period of the modulation wave, and the mode D continuously presents in the second half period of the modulation wave, so as not to well offset the fluctuated voltages accumulated on C1 and C2.
Description
Technical field
The present invention relates to electric and electronic technical field, particularly the modulator approach of a kind of pair of Buck circuit and device.
Background technology
In photovoltaic combining inverter, it is common circuit topology that two Buck circuit are added power frequency commutation circuit.Referring to Fig. 1, this figure is the circuit topology figure of photovoltaic inversion of the prior art.
There are four kinds of operation modes in the two Buck circuit 200 shown in Fig. 1.Below in conjunction with accompanying drawing, be introduced one by one.
Referring to Fig. 2 a, this figure is the first operation mode schematic diagram of two Buck circuit.
The first switch transistor T 1 and second switch pipe T2 conducting simultaneously.
The first capacitor C 1 is through C1-T1-L1-C3-C1 electric discharge, and the first inductance L 1 is charged; The second capacitor C 2 is through C2-C4-L2-T2-C2 electric discharge, and the second inductance L 2 is charged.
Under this operation mode, T1 and T2 conducting simultaneously, DC power supply is powered to load-side always to C1 and C2 charging time.Therefore, can think that the voltage of DC power supply is constant, the mid point electric current of C1 and C2 is zero, and it is constant that the voltage of C1 and C2 keeps, and can not be offset.
Referring to Fig. 2 b, this figure is the second operation mode schematic diagram of two Buck circuit.
T1, T2 ends simultaneously.
L1 discharges through L1-C3-D1-L1 afterflow, C1 charging; L2 discharges through L2-D2-C4-L2 afterflow, C2 charging.
Under this operation mode, T1 and T2 end simultaneously, and C1 and C2 do not power to load-side, therefore, can think that the mid point electric current of C1 and C2 is zero, and it is constant that the voltage of C1 and C2 keeps, and can not be offset.
Referring to Fig. 2 c, this figure is the third operation mode schematic diagram of two Buck circuit.
Under this operation mode, T1 conducting, T2 cut-off.C1 is by T1, L1, C3, C4 and D2 to load discharge, and the mid point of C1 and C2 is for flowing to load current, and therefore, C1 discharges, C2 charging.The voltage of C1 and C2 is offset like this.
The output voltage V of two buck circuit
busequal the terminal voltage of C1, i.e. V
bus=u
c1.
Referring to Fig. 2 d, this figure is the 4th kind of operation mode schematic diagram of two Buck circuit.
T1 cut-off, T2 conducting.
Under this operation mode, T1 cut-off, T2 conducting.C2 discharges to load by D1, L1, C3, C4 and T2, and the mid point of C1 and C2 is for flowing out load current, and therefore, C1 charges, C2 electric discharge.Like this, the voltage of C1 and C2 is offset.
The output voltage V of two buck circuit
busequal the terminal voltage of C2, i.e. V
bus=u
c2.
Above four kinds of operation modes are defined as respectively A, B, C and tetra-kinds of operation modes of D, and as seen from the above analysis, the voltage fluctuation on C1 and C2 is by producing under C and these two kinds of operation modes of D.
Introduce the modulator approach of two Buck circuit in prior art below.
Referring to Fig. 3, this figure is the schematic diagram of the modulator approach of two Buck circuit in prior art.
Fig. 3 shows: t
0-t
4time period, A, B mode and C mode alternate conduction, according to each time period in figure, i.e. t
0-t
1, t
1-t
2, t
2-t
3, t
3-t
4.Because A and B mode can not cause the voltage fluctuation of C1 and C2.Therefore, t
0-t
4time period, C mode makes C1 substantially in continuous discharge state, the voltage drop on C1, and C2 is in continuing charged state, and the voltage on C2 rises.
In like manner, t
4-t
8time period, the alternate conduction of A, B mode and D mode, according to each time period in figure, i.e. t
4-t
5, t
5-t
6, t
6-t
7, t
7-t
8.Because A and B mode can not cause the voltage fluctuation of C1 and C2.Therefore, t
4-t
8time period, D mode makes C2 substantially in continuous discharge state, the voltage drop on C2, and C1 is in continuing charged state, and the voltage on C1 rises.
Below in conjunction with Fig. 3 and Fig. 4, analyze the shortcoming that modulator approach of the prior art exists.
Fig. 4 is the schematic diagram that discharges and recharges of the first capacitor C 1 corresponding to the modulator approach of existing pair of Buck circuit.Due to the charge status on C2 and C1 similar, therefore, the C1 of only take describes as example.
In Fig. 3 by analysis at t
0-t
4time period, C mode makes C1 substantially in continuous discharge state, the voltage drop on C1, as shown in Figure 4, linearly downward trend of the voltage on C1.T
4-t
8time period, D mode makes C1 in continuing charged state, and the voltage on C1 rises.As shown in Figure 4, the ascendant trend linearly of the voltage on C1.Due in one-period T, the energy reserving conservation on C1, so the electric weight of charging and discharging should be identical, therefore, in Fig. 4, leg-of-mutton area more than X-axis should equate with the leg-of-mutton area below X-axis.
The time that discharges and recharges long in this modulator approach shown in Fig. 3, by causing the voltage undulation of C1, C2 and L1, inductance L 2 larger, causes the ripple current of L1, L2 larger, and loss is larger; And when DC side current fluctuation is larger, (THD, Total Harmonic Distortion) is larger for the total harmonic distortion of the modulating wave of grid-connected current, causes sinusoidal degree poor.
Summary of the invention
The technical problem to be solved in the present invention is to provide modulator approach and the device of a kind of pair of Buck circuit, and that can shorten electric capacity and inductance continues to discharge and recharge the time, reduces voltage fluctuation and ripple current.
The invention provides the modulator approach of a kind of pair of Buck circuit, the voltage of the first electric capacity in two Buck circuit and the common port of the second electric capacity is half Vdc/2 of direct voltage Vdc;
Modulating wave has three zero crossings in one-period T, is designated as respectively t
0, t
4and t
8; t
4mid point for cycle T; Obtain this three zero crossing t
0, t
4and t
8;
By t
0postpone 1/4 mid point t that cycle T was the first half period
2; By t
0postpone 3/4 mid point t that cycle T was the second half period
6;
The waveform of the first half period of modulating wave and the waveform of the second half period respectively straight line corresponding with Vdc/2 have two intersection points, and two times corresponding to intersection point of the straight line that the waveform of note the first half period of modulating wave is corresponding with Vdc/2 are respectively t
1and t
3, two times corresponding to intersection point of the waveform straight line corresponding with Vdc/2 of note the second half period of modulating wave are respectively t
5and t
7;
T
0-t
1time period, the first switching tube in the two Buck circuit of control, according to Using Sinusoidal Pulse Width Modulation turn-on and turn-off, is controlled the second switch pipe cut-off in two Buck circuit;
T
1-t
2time period, control described the first switching tube according to Using Sinusoidal Pulse Width Modulation turn-on and turn-off, control the conducting of described second switch pipe;
T
2-t
3time period, control described second switch pipe according to Using Sinusoidal Pulse Width Modulation turn-on and turn-off, control described the first switching tube conducting;
T
3-t
4time period, control described second switch pipe according to Using Sinusoidal Pulse Width Modulation turn-on and turn-off, control described the first switching tube cut-off;
T
4-t
5time period, control described second switch pipe according to Using Sinusoidal Pulse Width Modulation turn-on and turn-off, control described the first switching tube cut-off;
T
5-t
6time period, control described second switch pipe according to Using Sinusoidal Pulse Width Modulation turn-on and turn-off, control described the first switching tube conducting;
T
6-t
7time period, control described the first switching tube according to Using Sinusoidal Pulse Width Modulation turn-on and turn-off, control the conducting of described second switch pipe;
T
7-t
8time period, control described the first switching tube according to Using Sinusoidal Pulse Width Modulation turn-on and turn-off, control described second switch pipe cut-off.
Preferably, described the first switching tube is according to Using Sinusoidal Pulse Width Modulation turn-on and turn-off, and described second switch pipe is disconnected according to Using Sinusoidal Pulse Width Modulation conducting and pipe, is specially:
T
0-t
1time period, the conducting sequential of described the first switching tube compares generation by described modulating wave and the second triangular wave, the first switching tube conducting when described modulating wave is greater than the second triangular wave, otherwise cut-off;
T
1-t
2time period, the conducting sequential of described the first switching tube compares generation by described modulating wave and the first triangular wave, the first switching tube conducting when described modulating wave is greater than described the first triangular wave, otherwise cut-off;
T
6-t
7time period, the conducting sequential of described the first switching tube and described t
1-t
2during the time period, the control of the conducting sequential of the first switching tube is identical;
T
7-t
8time period, the conducting sequential of described the first switching tube and described t
0-t
1during the time period, the control of the conducting sequential of the first switching tube is identical;
T
2-t
3time period, the conducting sequential of described second switch pipe compares generation by described modulating wave and described the first triangular wave, second switch pipe conducting when described modulating wave is greater than described the first triangular wave, otherwise cut-off;
T
3-t
4time period, the conducting sequential of described second switch pipe compares generation by described modulating wave and described the second triangular wave, second switch pipe conducting when described modulating wave is greater than described the second triangular wave, otherwise cut-off;
T
4-t
5time period, the conducting sequential of described second switch pipe and described t
3-t
4during the time period, the control of the conducting sequential of second switch pipe is identical;
T
5-t
6time period, the conducting sequential of described second switch pipe and described t
2-t
3during the time period, the control of the conducting sequential of second switch pipe is identical;
Described the first triangular wave, the second triangular wave have identical frequency and identical amplitude, and the trough of described the first triangular wave equals the crest of the second triangular wave.
Preferably, described cycle T is determined by mains frequency.
Preferably, when mains frequency is 50Hz, described cycle T is 20ms.
The present invention also provides the modulating device of a kind of pair of Buck circuit, comprising: time determining unit and control unit;
Described time determining unit, for determining the time period of modulation; Be specially: modulating wave has three zero crossings in one-period T, is designated as respectively t
0, t
4and t
8; t
4mid point for cycle T; Obtain this three zero crossing t
0, t
4and t
8; By t
0postpone 1/4 mid point t that cycle T was the first half period
2; By t
0postpone 3/4 mid point t that cycle T was the second half period
6; The waveform of the first half period of modulating wave and the waveform of the second half period respectively straight line corresponding with Vdc/2 have two intersection points, and two times corresponding to intersection point of the straight line that the waveform of note the first half period of modulating wave is corresponding with Vdc/2 are respectively t
1and t
3, two times corresponding to intersection point of the waveform straight line corresponding with Vdc/2 of note the second half period of modulating wave are respectively t
5and t
7;
Described control unit, for controlling two the first switching tubes of Buck circuit and the on off state of second switch pipe, is specially: t
0-t
1time period, the first switching tube in the two Buck circuit of control, according to Using Sinusoidal Pulse Width Modulation turn-on and turn-off, is controlled the second switch pipe cut-off in two Buck circuit; t
1-t
2time period, control described the first switching tube according to Using Sinusoidal Pulse Width Modulation turn-on and turn-off, control the conducting of described second switch pipe; t
2-t
3time period, control described second switch pipe according to Using Sinusoidal Pulse Width Modulation turn-on and turn-off, control described the first switching tube conducting; t
3-t
4time period, control described second switch pipe according to Using Sinusoidal Pulse Width Modulation turn-on and turn-off, control described the first switching tube cut-off; t
4-t
5time period, control described second switch pipe according to Using Sinusoidal Pulse Width Modulation turn-on and turn-off, control described the first switching tube cut-off; t
5-t
6time period, control described second switch pipe according to Using Sinusoidal Pulse Width Modulation turn-on and turn-off, control described the first switching tube conducting; t
6-t
7time period, control described the first switching tube according to Using Sinusoidal Pulse Width Modulation turn-on and turn-off, control the conducting of described second switch pipe; t
7-t
8time period, control described the first switching tube according to Using Sinusoidal Pulse Width Modulation turn-on and turn-off, control described second switch pipe cut-off.
6, the modulating device of according to claim 5 pair of Buck circuit, is characterized in that, described the first switching tube is according to Using Sinusoidal Pulse Width Modulation turn-on and turn-off, and described second switch pipe is disconnected according to Using Sinusoidal Pulse Width Modulation conducting and pipe, is specially:
T
0-t
1time period, the conducting sequential of described the first switching tube compares generation by described modulating wave and the second triangular wave, the first switching tube conducting when described modulating wave is greater than the second triangular wave, otherwise cut-off;
T
1-t
2time period, the conducting sequential of described the first switching tube compares generation by described modulating wave and the first triangular wave, the first switching tube conducting when described modulating wave is greater than described the first triangular wave, otherwise cut-off;
T
2-t
3time period, the conducting sequential of described second switch pipe compares generation by described modulating wave and described the first triangular wave, second switch pipe conducting when described modulating wave is greater than described the first triangular wave, otherwise cut-off;
T
3-t
4time period, the conducting sequential of described second switch pipe compares generation by described modulating wave and described the second triangular wave, second switch pipe conducting when described modulating wave is greater than described the second triangular wave, otherwise cut-off;
T
4-t
5time period, the conducting sequential of described second switch pipe and described t
3-t
4during the time period, the control of the conducting sequential of second switch pipe is identical;
T
5-t
6time period, the conducting sequential of described second switch pipe and described t
2-t
3during the time period, the control of the conducting sequential of second switch pipe is identical;
T
6-t
7time period, the conducting sequential of described the first switching tube and described t
1-t
2during the time period, the control of the conducting sequential of the first switching tube is identical;
T
7-t
8time period, the conducting sequential of described the first switching tube and described t
0-t
1during the time period, the control of the conducting sequential of the first switching tube is identical; Described the first triangular wave, the second triangular wave have identical frequency and identical amplitude, and the trough of described the first triangular wave equals the crest of the second triangular wave.
Preferably, described cycle T is determined by mains frequency.
Preferably, when mains frequency is 50Hz, described cycle T is 20ms.
Compared with prior art, the present invention has the following advantages:
Modulator approach and the device of two Buck circuit that the embodiment of the present invention provides, be that mode C and mode D appear in compartment of terrain in the first half period and second half period of modulating wave, the upper voltage fluctuation producing of C1 and C2 in the time of can effectively offsetting mode C and mode D like this.And the continuous discharge of C1, C2 and L1, L2 and lasting charging interval are all shorter,, greatly reduce the voltage undulation of C1, C2 and L1, L2, thereby reduced the ripple of output voltage, improved output waveform.And in the first half period of modulating wave, continue to occur mode C in prior art, and in the second half period of modulating wave, continue to occur mode D, can not offset preferably like this fluctuation voltage of the upper accumulation of C1 and C2.
Accompanying drawing explanation
Fig. 1 is the circuit topology figure of photovoltaic inversion of the prior art;
Fig. 2 a is the first operation mode schematic diagram of two Buck circuit;
Fig. 2 b is the second operation mode schematic diagram of two Buck circuit;
Fig. 2 c is the third operation mode schematic diagram of two Buck circuit;
Fig. 2 d is the 4th kind of operation mode schematic diagram of two Buck circuit;
Fig. 3 is the schematic diagram of the modulator approach of two Buck circuit in prior art;
Fig. 4 is the schematic diagram that discharges and recharges of the first electric capacity corresponding to modulator approach of the prior art;
Fig. 5 is the schematic diagram of the modulator approach of provided by the invention pair of Buck circuit;
Fig. 6 is the sequential chart of modulator approach provided by the invention to deserved the first switching tube and second switch pipe;
Fig. 7 is the schematic diagram that discharges and recharges of the first electric capacity corresponding to modulator approach provided by the invention;
Fig. 8 is the structure chart of the modulating device of provided by the invention pair of Buck circuit.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.
Referring to Fig. 5, this figure is the schematic diagram of the modulator approach of provided by the invention pair of Buck circuit.
This embodiment can analyze in conjunction with A, B, C and tetra-kinds of mode schematic diagrames of D of two Buck circuit of Fig. 2 a-Fig. 2 d.
In Fig. 5, the instantaneous value of grid-connected absolute value of voltage is u, and the instantaneous value of grid-connected current is i.
The modulator approach of two Buck circuit that the present embodiment provides, the voltage of the first capacitor C 1 in two Buck circuit and the common port of the second capacitor C 2 is half Vdc/2 of direct voltage Vdc;
Modulating wave has three zero crossings in one-period T, is designated as respectively t
0, t
4and t
8; t
4mid point for cycle T; Obtain this three zero crossing t
0, t
4and t
8;
By t
0postpone 1/4 mid point t that cycle T was the first half period
2; By t
0postpone 3/4 mid point t that cycle T was the second half period
6;
The waveform of the first half period of modulating wave and the waveform of the second half period respectively straight line corresponding with Vdc/2 have two intersection points, and two times corresponding to intersection point of the straight line that the waveform of note the first half period of modulating wave is corresponding with Vdc/2 are respectively t
1and t
3, two times corresponding to intersection point of the waveform straight line corresponding with Vdc/2 of note the second half period of modulating wave are respectively t
5and t
7;
T
0-t
1time period, the first switch transistor T 1 in the two Buck circuit of control, according to Using Sinusoidal Pulse Width Modulation turn-on and turn-off, is controlled the second switch pipe T2 cut-off in two Buck circuit;
T
1-t
2time period, control described the first switch transistor T 1 according to Using Sinusoidal Pulse Width Modulation turn-on and turn-off, control described second switch pipe T2 conducting;
T
2-t
3time period, control described second switch pipe T2 according to Using Sinusoidal Pulse Width Modulation turn-on and turn-off, control described the first switch transistor T 1 conducting;
T
3-t
4time period, control described second switch pipe T2 according to Using Sinusoidal Pulse Width Modulation turn-on and turn-off, control described the first switch transistor T 1 cut-off;
T
4-t
5time period, control described second switch pipe according to Using Sinusoidal Pulse Width Modulation turn-on and turn-off, control described the first switching tube cut-off;
T
5-t
6time period, control described second switch pipe according to Using Sinusoidal Pulse Width Modulation turn-on and turn-off, control described the first switching tube conducting;
T
6-t
7time period, control described the first switching tube according to Using Sinusoidal Pulse Width Modulation turn-on and turn-off, control the conducting of described second switch pipe;
T
7-t
8time period, control described the first switching tube according to Using Sinusoidal Pulse Width Modulation turn-on and turn-off, control described second switch pipe cut-off.
It should be noted that, control T1 or T2 according to Using Sinusoidal Pulse Width Modulation turn-on and turn-off, to be realized by drive pulse signal, for example, drive pulse signal is provided to the control end of T1, T1 conducting in the high level time section of drive pulse signal, in the low level time section of drive pulse signal, T1 turn-offs.The turn-on and turn-off condition of T2 is similar.This drive pulse signal according to Using Sinusoidal Pulse Width Modulation out.
The drive pulse signal of T1 and T2 as shown in Figure 6.
When the drive pulse signal low and high level of T1 replaces, the turn-on and turn-off of corresponding T1, during high level, T1 conducting, during low level, T1 turn-offs.When the drive pulse signal of T1 continues low level, T1 keeps turn-offing; When the drive pulse signal of T1 continues high level, T1 keeps conducting.
As shown in Figure 6, at t
0-t
2time period, the drive pulse signal low and high level of T1 replaces, therefore, and corresponding T1 turn-on and turn-off.At t
2-t
3time period, the drive pulse signal of T1 keeps high level, and therefore, T1 keeps conducting.At t
3-t
4time period, the drive pulse signal of T1 keeps low level, and therefore, T1 keeps turn-offing.Other times section is similar, does not repeat them here.
In addition, the turn-on and turn-off condition of T2 and T1's is similar, specifically can, referring to the drive pulse signal of Fig. 6, not repeat them here.
Described the first switch transistor T 1 is according to Using Sinusoidal Pulse Width Modulation turn-on and turn-off, and described second switch pipe T2 is disconnected according to Using Sinusoidal Pulse Width Modulation conducting and pipe, is specially:
T
0-t
1time period, the conducting sequential of described the first switch transistor T 1 compares generation by described modulating wave Z and the second triangular wave B, the first switch transistor T 1 conducting when described modulating wave Z is greater than the second triangular wave B, otherwise cut-off;
T
1-t
2time period, the conducting sequential of described the first switch transistor T 1 compares generation by described modulating wave Z and the first triangular wave A, the first switch transistor T 1 conducting when described modulating wave Z is greater than described the first triangular wave A, otherwise cut-off;
T
2-t
3time period, the conducting sequential of described second switch pipe T2 compares generation by described modulating wave Z and described the first triangular wave A, second switch pipe T2 conducting when described modulating wave Z is greater than described the first triangular wave A, otherwise cut-off;
T
3-t
4time period, the conducting sequential of described second switch pipe T2 compares generation by described modulating wave Z and described the second triangular wave B, second switch pipe T2 conducting when described modulating wave Z is greater than described the second triangular wave B, otherwise cut-off;
T
4-t
5time period, the conducting sequential of described second switch pipe T2 and described t
3-t
4during the time period, the control of the conducting sequential of second switch pipe is identical; That is: second switch pipe T2 conducting when described modulating wave Z is greater than described the second triangular wave B, otherwise cut-off;
T
5-t
6time period, the conducting sequential of described second switch pipe and described t
2-t
3during the time period, the control of the conducting sequential of second switch pipe is identical; That is: second switch pipe T2 conducting when described modulating wave Z is greater than described the first triangular wave A, otherwise cut-off;
T
6-t
7time period, the conducting sequential of described the first switch transistor T 1 and described t
1-t
2during the time period, the control of the conducting sequential of the first switch transistor T 1 is identical; That is: the first switch transistor T 1 conducting when described modulating wave Z is greater than described the first triangular wave A, otherwise cut-off; Specifically referring to the sequential chart of Fig. 6.
T
7-t
8time period, the conducting sequential of described the first switch transistor T 1 and described t
0-t
1during the time period, the control of the conducting sequential of the first switch transistor T 1 is identical; That is: the first switch transistor T 1 conducting when described modulating wave Z is greater than the second triangular wave B, otherwise cut-off; Specifically referring to the sequential chart of Fig. 6.
Described the first triangular wave A, the second triangular wave B have identical frequency and identical amplitude, and the trough of described the first triangular wave A equals the crest of the second triangular wave B.
T
0-t
1time period, mode B and mode C switch; t
1-t
2time period, mode A and mode D switch;
T
2-t
3time period, mode A and mode C switch;
T
3-t
4time period, mode B and mode D switch;
T
4-t
5time period, mode B and mode D switch;
T
5-t
6time period, mode A and mode C switch;
T
6-t
7time period, mode A and mode D switch;
T
7-t
8time period, mode B and mode C switch.
That switch in the first half period of modulating wave as can be seen from Figure 5, is respectively BC, AD, AC and BD.Because circuit structure in mode A and mode B is symmetrical, in mode A, the state of C1, C2 is identical, simultaneously power supply, therefore, can think that the voltage of DC power supply is constant during mode A, the mid point electric current of C1 and C2 is zero, it is constant that the voltage of C1 and C2 keeps, and can not be offset.In mode B, the state of C1 and C2 is also identical, does not power simultaneously, therefore, can think that the mid point electric current of C1 and C2 is zero during mode B, and it is constant that the voltage of C1 and C2 keeps, and can not be offset.Therefore,, when mode A and mode B, the voltage stabilization of the upper voltage of C1 and C2 can not produce fluctuation.Therefore, in modulation, the voltage fluctuation in the time of can not considering mode A and mode B on C1 and C2.During mode C, C1 electric discharge, C2 charging.The voltage of C1 and C2 is offset like this.During mode D, C1 charging, C2 electric discharge.Like this, the voltage of C1 and C2 is offset.Voltage fluctuation while therefore, mainly considering mode C and mode D on C1 and C2.So in the embodiment of the present invention, in the first half period of modulating wave, that can regard switching as is mode C, D, C, D.There is mode C and mode D in compartment of terrain like this, can effectively offset C1 and the upper voltage fluctuation producing of C2 in mode C and mode D.
Particularly, can be referring to Fig. 7, in the first half period of modulating wave, t
0-t
1time period C mode makes C1 electric discharge, voltage drop; t
1-t
2time period D mode makes C1 charging, and voltage rises; t
2-t
3time period, C mode makes C1 electric discharge, voltage drop; t
3-t
4time period, D mode makes C1 charging, and voltage rises.
That switch in the second half period of modulating wave is mode D, C, D, C.Like this, within the second half period, switch mode D and mode C compartment of terrain, can offset the upper fluctuation voltage producing of C1 and C2.Particularly, can be referring to Fig. 7, in the second half period of modulating wave, t
4-t
5time period D mode makes C1 charging, and voltage rises; t
5-t
6time period C mode makes C1 electric discharge, voltage drop; t
6-t
7time period, D mode makes C1 charging, and voltage rises; t
7-t
8time period, C mode makes C1 electric discharge, voltage drop.
And, as can be seen from Figure 5, the order of the second half period and the first half period Mode-switch is contrary, this is because if the result of grid-connected phase-locked loop exists faint error, on C1 and C2, can produce the accumulation of deviation, can adopt so the symmetrical control method shown in Fig. 5 that the embodiment of the present invention provides to eliminate the accumulation of deviation.Utilize grid-connected phase-locked loop to obtain t in Fig. 5
2, t
6the error constantly existing, the first half period t
0-t
4with the second half period t
4-t
8in two time periods, adopt about t
4the operation mode of full symmetric, reduces the adverse effect of above-mentioned error with this constantly.
And, by Fig. 4 of Fig. 7 more of the present invention and prior art, can find out more significantly, the modulator approach of provided by the invention pair of Buck circuit, the voltage fluctuation of the C1 that modulator approach that the voltage fluctuation on C1 provides than prior art is corresponding reduces significantly.Similar due on the fluctuation voltage on C2 and C1, does not repeat them here.
The modulator approach of two Buck circuit that the embodiment of the present invention provides, there is mode C and mode D in the first half period compartment of terrain at modulating wave, the second half period was that mode D and mode C appear in compartment of terrain, the upper voltage fluctuation producing of C1 and C2 in the time of can effectively offsetting mode C and mode D like this.And the continuous discharge of C1, C2 and L1, L2 and lasting charging interval are all shorter, be approximately prior art and continue to discharge and recharge half of time, greatly reduce the voltage undulation of C1, C2 and L1, L2, thereby reduced the ripple of output voltage, improved output waveform.And in the first half period of modulating wave, continue to occur mode C in prior art, and in the second half period of modulating wave, continue to occur mode D, can not offset preferably like this fluctuation voltage of the upper accumulation of C1 and C2.
It should be noted that, obtain modulating wave at three each and every one zero crossing t of one-period T
0, t
4and t
8can there be a lot of middle implementations, for example, can by grid-connected phase-locked loop, find out the moment of voltage zero-crossing point of power grid, obtain this three zero crossings.
It should be noted that, described cycle T is determined by mains frequency.For example, when mains frequency is 50Hz, described cycle T is 20ms.
Modulator approach based on above-mentioned pair of Buck circuit, the present invention also provides the modulating device of two Buck circuit, below in conjunction with specific embodiment, describes its part in detail.
Referring to Fig. 8, this figure is the structure chart of the modulating device of provided by the invention pair of Buck circuit.
The embodiment of the present invention provides the modulating device of a kind of pair of Buck circuit, comprising: time determining unit 100 and control unit 200;
Described time determining unit 100, for determining the time period of modulation; Be specially: modulating wave has three zero crossings in one-period T, is designated as respectively t
0, t
4and t
8; t
4mid point for cycle T; Obtain this three zero crossing t
0, t
4and t
8; By t
0postpone 1/4 mid point t that cycle T was the first half period
2; By t
0postpone 3/4 mid point t that cycle T was the second half period
6; The waveform of the first half period of modulating wave and the waveform of the second half period respectively straight line corresponding with Vdc/2 have two intersection points, and two times corresponding to intersection point of the straight line that the waveform of note the first half period of modulating wave is corresponding with Vdc/2 are respectively t
1and t
3, two times corresponding to intersection point of the waveform straight line corresponding with Vdc/2 of note the second half period of modulating wave are respectively t
5and t
7;
Described control unit 200, for controlling two the first switching tubes of Buck circuit and the on off state of second switch pipe according to definite time period of time determining unit 100, is specially: t
0-t
1time period, the first switching tube in the two Buck circuit of control, according to Using Sinusoidal Pulse Width Modulation turn-on and turn-off, is controlled the second switch pipe cut-off in two Buck circuit; t
1-t
2time period, control described the first switching tube according to Using Sinusoidal Pulse Width Modulation turn-on and turn-off, control the conducting of described second switch pipe; t
2-t
3time period, control described second switch pipe according to Using Sinusoidal Pulse Width Modulation turn-on and turn-off, control described the first switching tube conducting; t
3-t
4time period, control described second switch pipe according to Using Sinusoidal Pulse Width Modulation turn-on and turn-off, control described the first switching tube cut-off; t
4-t
5time period, control described the first switching tube according to Using Sinusoidal Pulse Width Modulation turn-on and turn-off, control described second switch pipe cut-off; t
5-t
6time period, control described the first switching tube according to Using Sinusoidal Pulse Width Modulation turn-on and turn-off, control the conducting of described second switch pipe; t
6-t
7time period, control described second switch pipe according to Using Sinusoidal Pulse Width Modulation turn-on and turn-off, control described the first switching tube conducting; t
7-t
8time period, control described second switch pipe according to Using Sinusoidal Pulse Width Modulation turn-on and turn-off, control described the first switching tube cut-off.
It should be noted that, control T1 or T2 according to Using Sinusoidal Pulse Width Modulation turn-on and turn-off, to be realized by drive pulse signal, for example, drive pulse signal is provided to the control end of T1, T1 conducting in the high level time section of drive pulse signal, in the low level time section of drive pulse signal, T1 turn-offs.The turn-on and turn-off condition of T2 is similar.This drive pulse signal according to Using Sinusoidal Pulse Width Modulation out.
The sequential chart of the drive pulse signal of T1 and T2 as shown in Figure 6.
When the drive pulse signal low and high level of T1 replaces, the turn-on and turn-off of corresponding T1, during high level, T1 conducting, during low level, T1 turn-offs.When the drive pulse signal of T1 continues low level, T1 keeps turn-offing; When the drive pulse signal of T1 continues high level, T1 keeps conducting.
As shown in Figure 6, at t
0-t
2time period, the drive pulse signal low and high level of T1 replaces, therefore, and corresponding T1 turn-on and turn-off.At t
2-t
3time period, the drive pulse signal of T1 keeps high level, and therefore, T1 keeps conducting.At t
3-t
4time period, the drive pulse signal of T1 keeps low level, and therefore, T1 keeps turn-offing.Other times section is similar, does not repeat them here.
In addition, the turn-on and turn-off condition of T2 and T1's is similar, specifically can, referring to the drive pulse signal of Fig. 6, not repeat them here.
Described the first switch transistor T 1 is according to Using Sinusoidal Pulse Width Modulation turn-on and turn-off, and described second switch pipe T2 is disconnected according to Using Sinusoidal Pulse Width Modulation conducting and pipe, is specially:
T
0-t
1time period, the conducting sequential of described the first switch transistor T 1 compares generation by described modulating wave Z and the second triangular wave B, the first switch transistor T 1 conducting when described modulating wave Z is greater than the second triangular wave B, otherwise cut-off;
T
1-t
2time period, the conducting sequential of described the first switch transistor T 1 compares generation by described modulating wave Z and the first triangular wave A, the first switch transistor T 1 conducting when described modulating wave Z is greater than described the first triangular wave A, otherwise cut-off;
T
6-t
7time period, the conducting sequential of described the first switch transistor T 1 and described t
1-t
2during the time period, the control of the conducting sequential of the first switch transistor T 1 is identical; That is: the first switch transistor T 1 conducting when described modulating wave Z is greater than described the first triangular wave A, otherwise cut-off; Specifically referring to the sequential chart of Fig. 6.
T
7-t
8time period, the conducting sequential of described the first switch transistor T 1 and described t
0-t
1during the time period, the control of the conducting sequential of the first switch transistor T 1 is identical; That is: the first switch transistor T 1 conducting when described modulating wave Z is greater than the second triangular wave B, otherwise cut-off; Specifically referring to the sequential chart of Fig. 6.
T
2-t
3time period, the conducting sequential of described second switch pipe T2 compares generation by described modulating wave Z and described the first triangular wave A, second switch pipe T2 conducting when described modulating wave Z is greater than described the first triangular wave A, otherwise cut-off;
T
3-t
4time period, the conducting sequential of described second switch pipe T2 compares generation by described modulating wave Z and described the second triangular wave B, second switch pipe T2 conducting when described modulating wave Z is greater than described the second triangular wave B, otherwise cut-off;
T
4-t
5time period, the conducting sequential of described second switch pipe T2 and described t
3-t
4during the time period, the control of the conducting sequential of second switch pipe is identical; That is: second switch pipe T2 conducting when described modulating wave Z is greater than described the second triangular wave B, otherwise cut-off;
T
5-t
6time period, the conducting sequential of described second switch pipe and described t
2-t
3during the time period, the control of the conducting sequential of second switch pipe is identical; That is: second switch pipe T2 conducting when described modulating wave Z is greater than described the first triangular wave A, otherwise cut-off;
Described the first triangular wave A, the second triangular wave B have identical frequency and identical amplitude, and the trough of described the first triangular wave A equals the crest of the second triangular wave B.
That switch in the first half period of modulating wave as can be seen from Figure 5, is respectively BC, AD, AC and BD.Because circuit structure in mode A and mode B is symmetrical, in mode A, the state of C1, C2 is identical, simultaneously power supply, therefore, can think that the voltage of DC power supply is constant during mode A, the mid point electric current of C1 and C2 is zero, it is constant that the voltage of C1 and C2 keeps, and can not be offset.In mode B, the state of C1 and C2 is also identical, does not power simultaneously, therefore, can think that the mid point electric current of C1 and C2 is zero during mode B, and it is constant that the voltage of C1 and C2 keeps, and can not be offset.Therefore, the voltage stabilization of the upper voltage of C1 and C2 can not produce fluctuation.Therefore, in modulation, the voltage fluctuation in the time of can not considering mode A and mode B on C1 and C2.During mode C, C1 electric discharge, C2 charging.The voltage of C1 and C2 is offset like this.During mode D, C1 charging, C2 electric discharge.Like this, the voltage of C1 and C2 is offset.Voltage fluctuation while therefore, mainly considering mode C and mode D on C1 and C2.So in the embodiment of the present invention, in the first half period of modulating wave, that can regard switching as is mode C, D, C, D.There is mode C and mode D in compartment of terrain like this, can effectively offset C1 and the upper voltage fluctuation producing of C2 in mode C and mode D.
Particularly, can be referring to Fig. 7, in the first half period of modulating wave, t
0-t
1time period C mode makes C1 electric discharge, voltage drop; t
1-t
2time period D mode makes C1 charging, and voltage rises; t
2-t
3time period, C mode makes C1 electric discharge, voltage drop; t
3-t
4time period, D mode makes C1 charging, and voltage rises.
That switch in the second half period of modulating wave is mode D, C, D, C.Like this, within the second half period, switch mode D and mode C compartment of terrain, can offset the upper fluctuation voltage producing of C1 and C2.
Particularly, can be referring to Fig. 7, in the second half period of modulating wave, t
4-t
5time period D mode makes C1 charging, and voltage rises; t
5-t
6time period C mode makes C1 electric discharge, voltage drop; t
6-t
7time period, D mode makes C1 charging, and voltage rises; t
7-t
8time period, C mode makes C1 electric discharge, voltage drop.
And, as can be seen from Figure 5, the order of the second half period and the first half period Mode-switch is contrary, this is because if the result of grid-connected phase-locked loop exists faint error, on C1 and C2, can produce the accumulation of deviation, can adopt so the symmetrical control method shown in Fig. 5 that the embodiment of the present invention provides to eliminate the accumulation of deviation.Utilize grid-connected phase-locked loop to obtain t in Fig. 5
2, t
6the error constantly existing, the first half period t
0-t
4with the second half period t
4-t
8in two time periods, adopt about t
4the operation mode of full symmetric, reduces the adverse effect of above-mentioned error with this constantly.
The modulating device of two Buck circuit that the embodiment of the present invention provides, there is mode C and mode D in the first half period compartment of terrain at modulating wave, the second half period was that mode D and mode C appear in compartment of terrain, the upper voltage fluctuation producing of C1 and C2 in the time of can effectively offsetting mode C and mode D like this.And the continuous discharge of C1, C2 and L1, L2 and lasting charging interval are all shorter, greatly reduce the voltage undulation of C1, C2 and L1, L2, thereby reduced the ripple of output voltage, improved output waveform.And in the first half period of modulating wave, continue to occur mode C in prior art, and in the second half period of modulating wave, continue to occur mode D, can not offset preferably like this fluctuation voltage of the upper accumulation of C1 and C2.
It should be noted that, obtain modulating wave at three each and every one zero crossing t of one-period T
0, t
4and t
8can there be a lot of middle implementations, for example, can by grid-connected phase-locked loop, find out the moment of voltage zero-crossing point of power grid, obtain this three zero crossings.
It should be noted that, described cycle T is determined by mains frequency.For example, when mains frequency is 50Hz, described cycle T is 20ms.
The above, be only preferred embodiment of the present invention, not the present invention done to any pro forma restriction.Although the present invention discloses as above with preferred embodiment, yet not in order to limit the present invention.Any those of ordinary skill in the art, do not departing from technical solution of the present invention scope situation, all can utilize method and the technology contents of above-mentioned announcement to make many possible changes and modification to technical solution of the present invention, or be revised as the equivalent embodiment of equivalent variations.Therefore, every content that does not depart from technical solution of the present invention,, all still belongs in the scope of technical solution of the present invention protection any simple modification made for any of the above embodiments, equivalent variations and modification according to technical spirit of the present invention.
Claims (8)
1. a modulator approach for two Buck circuit, is characterized in that, the voltage of the first electric capacity in two Buck circuit and the common port of the second electric capacity is half Vdc/2 of direct voltage Vdc;
Described pair of Buck circuit comprises: the first diode, the second diode, the first switching tube, second switch pipe, the first electric capacity, the second electric capacity, the first inductance, the second inductance, the 3rd electric capacity and the 4th electric capacity;
One end of described the first electric capacity connects the anode of DC power supply, and the other end connects first node;
One end of described the second electric capacity connects the negative terminal of described DC power supply, and the other end connects described first node;
One end of described the first switching tube connects the anode of described DC power supply, and the other end connects Section Point;
One end of described second switch pipe connects the negative terminal of described DC power supply, and the other end connects the 3rd node;
First node described in the anodic bonding of described the first diode, the negative electrode of the first diode connects Section Point;
The 3rd node described in the anodic bonding of described the second diode, the negative electrode of the second diode connects described first node;
One end of described the first inductance connects described Section Point, and the other end of the first inductance connects first node by the 3rd electric capacity;
One end of described the second inductance connects described the 3rd node, and the other end of the second inductance connects first node by the 4th electric capacity; Modulating wave has three zero crossings in one-period T, is designated as respectively t
0, t
4and t
8; t
4mid point for cycle T; Obtain this three zero crossing t
0, t
4and t
8;
By t
0postpone 1/4 mid point t that cycle T was the first half period
2; By t
0postpone 3/4 mid point t that cycle T was the second half period
6;
The waveform of the first half period of modulating wave and the waveform of the second half period respectively straight line corresponding with Vdc/2 have two intersection points, and two times corresponding to intersection point of the straight line that the waveform of note the first half period of modulating wave is corresponding with Vdc/2 are respectively t
1and t
3, two times corresponding to intersection point of the waveform straight line corresponding with Vdc/2 of note the second half period of modulating wave are respectively t
5and t
7;
T
0-t
1time period, the first switching tube in the two Buck circuit of control, according to Using Sinusoidal Pulse Width Modulation turn-on and turn-off, is controlled the second switch pipe cut-off in two Buck circuit;
T
1-t
2time period, control described the first switching tube according to Using Sinusoidal Pulse Width Modulation turn-on and turn-off, control the conducting of described second switch pipe;
T
2-t
3time period, control described second switch pipe according to Using Sinusoidal Pulse Width Modulation turn-on and turn-off, control described the first switching tube conducting;
T
3-t
4time period, control described second switch pipe according to Using Sinusoidal Pulse Width Modulation turn-on and turn-off, control described the first switching tube cut-off;
T
4-t
5time period, control described second switch pipe according to Using Sinusoidal Pulse Width Modulation turn-on and turn-off, control described the first switching tube cut-off;
T
5-t
6time period, control described second switch pipe according to Using Sinusoidal Pulse Width Modulation turn-on and turn-off, control described the first switching tube conducting;
T
6-t
7time period, control described the first switching tube according to Using Sinusoidal Pulse Width Modulation turn-on and turn-off, control the conducting of described second switch pipe;
T
7-t
8time period, control described the first switching tube according to Using Sinusoidal Pulse Width Modulation turn-on and turn-off, control described second switch pipe cut-off.
2. the modulator approach of according to claim 1 pair of Buck circuit, is characterized in that, described the first switching tube is according to Using Sinusoidal Pulse Width Modulation turn-on and turn-off, and described second switch pipe is according to Using Sinusoidal Pulse Width Modulation turn-on and turn-off, is specially:
T
0-t
1time period, the conducting sequential of described the first switching tube compares generation by described modulating wave and the second triangular wave, the first switching tube conducting when described modulating wave is greater than the second triangular wave, otherwise cut-off;
T
1-t
2time period, the conducting sequential of described the first switching tube compares generation by described modulating wave and the first triangular wave, the first switching tube conducting when described modulating wave is greater than described the first triangular wave, otherwise cut-off;
T
6-t
7time period, the conducting sequential of described the first switching tube and described t
1-t
2during the time period, the control of the conducting sequential of the first switching tube is identical;
T
7-t
8time period, the conducting sequential of described the first switching tube and described t
0-t
1during the time period, the control of the conducting sequential of the first switching tube is identical;
T
2-t
3time period, the conducting sequential of described second switch pipe compares generation by described modulating wave and described the first triangular wave, second switch pipe conducting when described modulating wave is greater than described the first triangular wave, otherwise cut-off;
T
3-t
4time period, the conducting sequential of described second switch pipe compares generation by described modulating wave and described the second triangular wave, second switch pipe conducting when described modulating wave is greater than described the second triangular wave, otherwise cut-off;
T
4-t
5time period, the conducting sequential of described second switch pipe and described t
3-t
4during the time period, the control of the conducting sequential of second switch pipe is identical;
T
5-t
6time period, the conducting sequential of described second switch pipe and described t
2-t
3during the time period, the control of the conducting sequential of second switch pipe is identical;
Described the first triangular wave, the second triangular wave have identical frequency and identical amplitude, and the trough of described the first triangular wave equals the crest of the second triangular wave.
3. the modulator approach of according to claim 1 and 2 pair of Buck circuit, is characterized in that, described cycle T is determined by mains frequency.
4. the modulator approach of according to claim 3 pair of Buck circuit, is characterized in that, when mains frequency is 50Hz, described cycle T is 20ms.
5. the modulating device of two Buck circuit, it is characterized in that, two Buck circuit comprise: the first diode, the second diode, the first switching tube, second switch pipe, the first electric capacity, the second electric capacity, the first inductance, the second inductance, the 3rd electric capacity and the 4th electric capacity;
One end of described the first electric capacity connects the anode of DC power supply, and the other end connects first node;
One end of described the second electric capacity connects the negative terminal of described DC power supply, and the other end connects described first node;
One end of described the first switching tube connects the anode of described DC power supply, and the other end connects Section Point;
One end of described second switch pipe connects the negative terminal of described DC power supply, and the other end connects the 3rd node;
First node described in the anodic bonding of described the first diode, the negative electrode of the first diode connects Section Point;
The 3rd node described in the anodic bonding of described the second diode, the negative electrode of the second diode connects described first node;
One end of described the first inductance connects described Section Point, and the other end of the first inductance connects first node by the 3rd electric capacity;
One end of described the second inductance connects described the 3rd node, and the other end of the second inductance connects first node by the 4th electric capacity;
This modulating device comprises: time determining unit and control unit;
Described time determining unit, for determining the time period of modulation; Be specially: modulating wave has three zero crossings in one-period T, is designated as respectively t
0, t
4and t
8; t
4mid point for cycle T; Obtain this three zero crossing t
0, t
4and t
8; By t
0postpone 1/4 mid point t that cycle T was the first half period
2; By t
0postpone 3/4 mid point t that cycle T was the second half period
6; The waveform of the first half period of modulating wave and the waveform of the second half period respectively straight line corresponding with Vdc/2 have two intersection points, and two times corresponding to intersection point of the straight line that the waveform of note the first half period of modulating wave is corresponding with Vdc/2 are respectively t
1and t
3, two times corresponding to intersection point of the waveform straight line corresponding with Vdc/2 of note the second half period of modulating wave are respectively t
5and t
7;
Described control unit, for controlling two the first switching tubes of Buck circuit and the on off state of second switch pipe, is specially: t
0-t
1time period, the first switching tube in the two Buck circuit of control, according to Using Sinusoidal Pulse Width Modulation turn-on and turn-off, is controlled the second switch pipe cut-off in two Buck circuit; t
1-t
2time period, control described the first switching tube according to Using Sinusoidal Pulse Width Modulation turn-on and turn-off, control the conducting of described second switch pipe; t
2-t
3time period, control described second switch pipe according to Using Sinusoidal Pulse Width Modulation turn-on and turn-off, control described the first switching tube conducting; t
3-t
4time period, control described second switch pipe according to Using Sinusoidal Pulse Width Modulation turn-on and turn-off, control described the first switching tube cut-off; t
4-t
5time period, control described second switch pipe according to Using Sinusoidal Pulse Width Modulation turn-on and turn-off, control described the first switching tube cut-off; t
5-t
6time period, control described second switch pipe according to Using Sinusoidal Pulse Width Modulation turn-on and turn-off, control described the first switching tube conducting; t
6-t
7time period, control described the first switching tube according to Using Sinusoidal Pulse Width Modulation turn-on and turn-off, control the conducting of described second switch pipe; t
7-t
8time period, control described the first switching tube according to Using Sinusoidal Pulse Width Modulation turn-on and turn-off, control described second switch pipe cut-off.
6. the modulating device of according to claim 5 pair of Buck circuit, is characterized in that, described the first switching tube is according to Using Sinusoidal Pulse Width Modulation turn-on and turn-off, and described second switch pipe is according to Using Sinusoidal Pulse Width Modulation turn-on and turn-off, is specially:
T
0-t
1time period, the conducting sequential of described the first switching tube compares generation by described modulating wave and the second triangular wave, the first switching tube conducting when described modulating wave is greater than the second triangular wave, otherwise cut-off;
T
1-t
2time period, the conducting sequential of described the first switching tube compares generation by described modulating wave and the first triangular wave, the first switching tube conducting when described modulating wave is greater than described the first triangular wave, otherwise cut-off;
T
2-t
3time period, the conducting sequential of described second switch pipe compares generation by described modulating wave and described the first triangular wave, second switch pipe conducting when described modulating wave is greater than described the first triangular wave, otherwise cut-off;
T
3-t
4time period, the conducting sequential of described second switch pipe compares generation by described modulating wave and described the second triangular wave, second switch pipe conducting when described modulating wave is greater than described the second triangular wave, otherwise cut-off;
T
4-t
5time period, the conducting sequential of described second switch pipe and described t
3-t
4during the time period, the control of the conducting sequential of second switch pipe is identical;
T
5-t
6time period, the conducting sequential of described second switch pipe and described t
2-t
3during the time period, the control of the conducting sequential of second switch pipe is identical;
T
6-t
7time period, the conducting sequential of described the first switching tube and described t
1-t
2during the time period, the control of the conducting sequential of the first switching tube is identical;
T
7-t
8time period, the conducting sequential of described the first switching tube and described t
0-t
1during the time period, the control of the conducting sequential of the first switching tube is identical; Described the first triangular wave, the second triangular wave have identical frequency and identical amplitude, and the trough of described the first triangular wave equals the crest of the second triangular wave.
7. according to the modulating device of the two Buck circuit described in claim 5 or 6, it is characterized in that, described cycle T is determined by mains frequency.
8. the modulating device of according to claim 7 pair of Buck circuit, is characterized in that, when mains frequency is 50Hz, described cycle T is 20ms.
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| CN102751895B (en) * | 2012-06-12 | 2014-12-03 | 阳光电源股份有限公司 | Multi-level circuit, grid-connected inverter and modulation method of grid-connected inverter |
| CN102821531B (en) * | 2012-08-29 | 2015-03-11 | 孝感市捷能特种光源照明器具有限公司 | 'AC-AC (alternating current) regulation and control' based numerical-control HID (high intensity discharge) driving method and driver applying same |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4430394A1 (en) * | 1994-08-26 | 1995-01-26 | Manfred Prof Dr Ing Gekeler | Three-phase rectifier circuit having virtually sinusoidal input currents and a regulated DC output voltage |
| CN101197547A (en) * | 2006-12-06 | 2008-06-11 | 台达电子工业股份有限公司 | Three-phase synchronization AC generating circuit and its control method |
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| TWI346441B (en) * | 2006-11-10 | 2011-08-01 | Delta Electronics Inc | Three-level ac generating circuit and control method thereof |
| US7705490B2 (en) * | 2007-05-07 | 2010-04-27 | Bloom Energy Corporation | Integral stack columns |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4430394A1 (en) * | 1994-08-26 | 1995-01-26 | Manfred Prof Dr Ing Gekeler | Three-phase rectifier circuit having virtually sinusoidal input currents and a regulated DC output voltage |
| CN101197547A (en) * | 2006-12-06 | 2008-06-11 | 台达电子工业股份有限公司 | Three-phase synchronization AC generating circuit and its control method |
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