CN102118115B - Direct current-alternating current conversion circuit within range of wide input voltage value - Google Patents
Direct current-alternating current conversion circuit within range of wide input voltage value Download PDFInfo
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- CN102118115B CN102118115B CN 201010002119 CN201010002119A CN102118115B CN 102118115 B CN102118115 B CN 102118115B CN 201010002119 CN201010002119 CN 201010002119 CN 201010002119 A CN201010002119 A CN 201010002119A CN 102118115 B CN102118115 B CN 102118115B
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Abstract
The invention discloses a direct current-alternating current conversion circuit within the range of wide input voltage value, which is used for receiving an input voltage and converting the input voltage into an alternating-current output voltage. The conversion circuit comprises a transformer, at least three modulation switching circuits connected to a plurality of connecting ends, a rectification circuit, a filter circuit, an inverse switching circuit and a control unit, wherein a first primary winding and a second primary winding of the transformer are connected with each other in series; and the control unit is used for selectively controlling the work of two modulation switching circuits according to the value of the input voltage, and transmitting the power of the input voltage to the first primary winding, the second primary winding or the combined winding of the two so as to correspondingly change the percentage value between the voltage value of the winding working at the primary side of the transformer and the voltage value of the winding working at the secondary side of the transformer. The direct current-alternating current conversion circuit can receive the input voltage with wide larger variation range of voltage values; and as the value of the alternating-current output voltage is not affected by weakening sunlight intensity, the overall efficiency of the conversion circuit is higher and the manufacturing cost of the circuit is lower.
Description
Technical field
The present invention relates to a kind of change-over circuit, relate in particular to a kind of dc-ac conversion circuit of wide input voltage value scope.
Background technology
The human main energy sources of using is oil at present, produce required power or electric energy by burning petroleum, for example automobile or fuel oil type generator (factory), yet, the high temperature that produces in the oil combustion process and waste gas more can make Global Greenhouse Effect worsen except meeting causes the air quality deterioration.In addition, according to whole world Petroleum Production statistics, oil production rate will peak in 10 years; thereafter output is with reduced year by year; this means that not only oil price (comprising electricity price) will be no longer cheap, also may cause the arrival of real oil crisis, indirectly causes the global economy storm.
In view of this, the renewable energy resources (renewable energy) are converted to general people's livelihood power supply or machine power efficient and cost-effective, have become the important industry development policies that sophisticated technologies country takes into account environmental protection and generating.In the renewable energy resources such as solar energy, wind energy, tidal energy, geothermal energy, biological waste energy, utilize the renewable energy generating system of solar power generation, because have environmental protection, be easy to install, the maturation of commercialized technology and the auxiliary pushing of state plan, become the main selection of advanced country's development distributed power supply system.
Although solar energy has vast application potential, commercial opportunity is also increasingly mature, and solar energy generation technology is applied to domestic household, and it is to be overcome to still have many difficulties to have.For example: tradition is applied to the dc-ac conversion circuit of solar power generation or is called photovoltaic DC-to-AC converter (Photovoltaic Inverter, PV inverter), the voltage swing impact that its output voltage size can be produced by solar cell (solar cell), the output voltage size of photovoltaic DC-to-AC converter also can diminish thereupon when sunlight intensity dies down.
See also Fig. 1, it is applied to the circuit diagram of the photovoltaic DC-to-AC converter of solar power generation for tradition.As shown in Figure 1, for addressing the above problem, set up a prime booster circuit 101 (boost circuit) in this conventional photovoltaic inverter 10, in order to the input voltage V that first solar cell 2 is produced
InBe converted to and not died down by sunlight intensity to affect and than the bus voltage V of High Level DC Voltage value
Bus, for example 400 volts, then, will be than the bus voltage V of High Level DC Voltage value by the intermediate direct-current voltage reducing circuit 102 in the photovoltaic DC-to-AC converter 10
BusStep-down is the first direct voltage V of a specific voltage value
1, for example 220 volts, last, again by the first direct voltage V of rear class dc-ac conversion circuit 103 with the specific voltage value
1Be converted to ac output voltage V
oDie down when sunlight intensity and make the input voltage value V of generation
InWhen diminishing, owing to have prime booster circuit 101 in the photovoltaic DC-to-AC converter 10, so bus voltage V
BusCan keep fixed voltage value, not died down by sunlight intensity affects, and correspondence makes the ac output voltage V of photovoltaic DC-to-AC converter 10
oMagnitude of voltage (effective value) not died down by sunlight intensity to affect.
Although the photovoltaic DC-to-AC converter of three grades of formulas can make the ac output voltage V of photovoltaic DC-to-AC converter 10
oMagnitude of voltage not died down by sunlight intensity to affect, still, set up a prime booster circuit 101 in the photovoltaic DC-to-AC converter 10 and but cause photovoltaic DC-to-AC converter 10 whole efficiency variation and manufacturing cost to improve.Therefore, how to develop a kind of dc-ac conversion circuit that improves the wide input voltage value scope of above-mentioned prior art defective, be in fact the present problem in the urgent need to address of correlative technology field technical staff.
Summary of the invention
The object of the present invention is to provide a kind of dc-ac conversion circuit of wide input voltage value scope, it is two-stage type, need not set up the impact that the magnitude of voltage of can the receiver voltage value excursion larger input voltage of a prime booster circuit and ac output voltage is not died down by sunlight intensity, and make whole efficiency higher and manufacturing cost is lower.In addition, the dc-ac conversion circuit of wide input voltage value scope can only cooperate solar cell and reduce bulky, price is high and the battery pack of easy care not, the outlet side of the dc-ac conversion circuit of wide input voltage value scope directly is connected in parallel in custom power network or electricity network system, the electric energy that solar cell is produced direct feed-in custom power network or electricity network system.
For reaching above-mentioned purpose, of the present invention one than broad sense embodiment for a kind of dc-ac conversion circuit of wide input voltage value scope is provided, in order to receive input voltage and to be converted to ac output voltage, it comprises: transformer, the primary side of transformer comprises a plurality of links, the first armature winding and the second armature winding, and the first armature winding and the second armature winding are connected in a plurality of links and form the relation of being connected in series, and the primary side of transformer comprises secondary winding; At least three modulation switch circuit comprise one first modulation switch circuit, one second modulation switch circuit and one the 3rd modulation switch circuit, are connected to the first link, the second link and the 3rd link of a plurality of links; Rectification circuit is connected with the primary side of transformer, in order to the voltage commutation of secondary winding to produce the first commutating voltage first rectified current corresponding with it; Filter circuit is connected with rectification circuit, corresponding generation the second commutating voltage and its second corresponding rectified current in order to the high frequency composition of filtering the first commutating voltage first rectified current corresponding with it; The inverse switch circuit is connected with filter circuit, is converted to ac output current corresponding to ac output voltage in order to the second rectified current that the second commutating voltage is corresponding with it; And control unit, be connected with this modulation switch circuit and this inverse switch circuit, in order to control these switching circuit conducting or cut-offs, make the dc-ac conversion circuit work of wide input voltage value scope; Wherein, control unit is optionally controlled two these modulation switch circuit workings according to the magnitude of voltage of input voltage, make the electric energy of input voltage be sent to the winding of the first armature winding, the second armature winding or its combination, so that the corresponding change of ratio value between the magnitude of voltage of the magnitude of voltage of the winding of the primary side work of transformer and the primary side of transformer.
Beneficial effect of the present invention is, do not affect but the magnitude of voltage of the larger input voltage of dc-ac conversion circuit receiver voltage value excursion of the present invention and ac output voltage is not died down by sunlight intensity, so whole efficiency is higher and manufacturing cost is lower.
Description of drawings
Fig. 1: the circuit diagram that is applied to the photovoltaic DC-to-AC converter of solar power generation for tradition.
Fig. 2: be the circuit diagram of the dc-ac conversion circuit of the wide input voltage value scope of preferred embodiment of the present invention.
Fig. 3 A: be the voltage of Fig. 2 and the sequential schematic diagram of control signal.
Fig. 3 B: be the voltage of Fig. 2 and the sequential schematic diagram of control signal.
Fig. 4: be the circuit diagram of the dc-ac conversion circuit of the wide input voltage value scope of another preferred embodiment of the present invention.
Wherein, description of reference numerals is as follows:
10: conventional photovoltaic inverter 101: the prime booster circuit
102: intermediate direct-current voltage reducing circuit
103: the rear class dc-ac conversion circuit
1: the dc-ac conversion circuit of wide input voltage value scope
11a～11c: the first～the 3rd modulation switch circuit
12: rectification circuit 13: filter circuit
14: inverse switch circuit 15: control unit
2: solar cell 3: the custom power network
4: clean ammeter 5: electricity network system
T
r: transformer N
P1: the first armature winding
N
P2: the second armature winding N
s: secondary winding
K
1～K
3: the first～the 3rd link Q
A1: the first switch
Q
A2: second switch Q
B1: the 3rd switch
Q
B2: the 4th switch Q
C1: the 5th switch
Q
C2: the 6th switch Q
S1: minion is closed
Q
S2: the 8th switch Q
S3: the 9th switch
Q
S4: the tenth switch D
1～D
6: the first～the 6th diode
D
A1: the first body diode D
A2: the second body diode
D
B1: the 3rd body diode D
B2: the limbs diode
D
C1: five body constituents diode D
C2: the hexasomic diode
L
1: the first inductance C
1: the first electric capacity
V
S1～V
S4: the first～the 4th inverter signal V
A1: the first pulse width modulating signal
V
A2The second pulse width modulating signal V
B1: the 3rd pulse width modulating signal
V
B2: the 4th pulse width modulating signal V
C1: the 5th pulse width modulating signal
V
C2: the 6th pulse width modulating signal V
In: input voltage
V
o: ac output voltage V
R1: the first full-wave rectified voltage
V
R2The second full-wave rectified voltage I
o: ac output current
T1: very first time t2: the second time
V
Bus: bus voltage V
1: the first direct voltage
I
R1: the first full-wave rectification electric current I
R2: the second full-wave rectification electric current
Embodiment
Some exemplary embodiments that embody feature ﹠ benefits of the present invention will be described in detail in the explanation of back segment.Be understood that the present invention can have at different embodiment various variations, its neither departing from the scope of the present invention, and explanation wherein and be shown in the usefulness that ought explain in essence, but not in order to limit the present invention.
See also Fig. 2, it is the circuit diagram of the dc-ac conversion circuit of the wide input voltage value scope of preferred embodiment of the present invention.As shown in Figure 2, the input voltage V that produces in order to receive solar cell 2 of the dc-ac conversion circuit 1 of wide input voltage value scope
InAnd be converted to ac output voltage V
o, provide to electricity network system 5 to provide to custom power network 3 or via clean ammeter 4 (net meter), so ac output current I
oCan flow to custom power network 3 or electricity network system 5.The dc-ac conversion circuit 1 of wide input voltage value scope comprises: transformer T
r, three modulation switch circuit 11a, 11b, 11c, rectification circuit 12, filter circuit 13, inverse switch circuit 14 and control unit 15.
In present embodiment, transformer T
rPrimary side comprise the first link K
1, the second link K
2, the 3rd link K
3, the first armature winding N
P1(primary winding) and the second armature winding N
P2, and transformer T
rPrimary side comprise secondary winding N
s(secondary winding), wherein, the first armature winding N
P1Be connected in the first link K
1With the second link K
2Between, and the second armature winding N
P2Be connected in the second link K
2With the 3rd link K
3Between, make the first armature winding N
P1With the second armature winding N
P2Formation is connected in series relation.
Two inputs of the first modulation switch circuit 11a are connected to anode and the negative terminal (being positive input terminal and the negative input end of the dc-ac conversion circuit 1 of wide input voltage value scope) of solar cell 2, the output of the first modulation switch circuit 11a then with the first link K
1Connect; Two inputs of the second modulation switch circuit 11b are connected to anode and the negative terminal of solar cell 2, the output of the second modulation switch circuit 11b then with the second link K
2Connect; Two inputs of the 3rd modulation switch circuit 11c are connected to anode and the negative terminal of solar cell 2, the output of the 3rd modulation switch circuit 11c then with the 3rd link K
3Connect.In present embodiment, the first modulation switch circuit 11a is by the first switch Q
A1With second switch Q
A2Form, the second modulation switch circuit 11b is by the 3rd switch Q
B1With the 4th switch Q
B2Form, the 3rd modulation switch circuit 11c is by the 5th switch Q
C1With the 6th switch Q
C2Form, and the control end of each switch is connected with control unit 15 respectively.
The first pulse width modulating signal V of control unit 15 by producing
A1(PWM signal), the second pulse width modulating signal V
A2, the 3rd pulse width modulating signal V
B1, the 4th pulse width modulating signal V
B2, the 5th pulse width modulating signal V
C1And the 6th pulse width modulating signal V
C2, control respectively the first switch Q
A1, second switch Q
A2, the 3rd switch Q
B1, the 4th switch Q
B2, the 5th switch Q
C1And the 6th switch Q
C2Conducting or cut-off.
In present embodiment, rectification circuit 12 can be but not be limited to bridge rectifier that it comprises the first diode D
1, the second diode D
2, the 3rd diode D
3And the 4th diode D
4, rectification circuit 12 is connected in transformer T
rPrimary side and filter circuit 13 between, in order to secondary winding N
sVoltage and corresponding current commutates to produce the first full-wave rectified voltage V
R1The first full-wave rectification electric current I corresponding with it
R1
In present embodiment, filter circuit 13 can be but not be limited to low general formula that it comprises the first inductance L
1With the first capacitor C
1, in order to filtering the first full-wave rectified voltage V
R1The first full-wave rectification electric current I corresponding with it
R1The high frequency composition and the corresponding second full-wave rectified voltage V that produces
R2The second full-wave rectification electric current I corresponding with it
R2The first inductance L wherein
1Be connected between the positive input terminal of the positive output end of rectification circuit 12 and inverse switch circuit 14, and the first capacitor C
1Be connected between the positive input terminal and negative input end of inverse switch circuit 14.
See also Fig. 3 A with Fig. 3 B and cooperate Fig. 2, wherein Fig. 3 A and Fig. 3 B are the voltage of Fig. 2 and the sequential schematic diagram of control signal.Shown in Fig. 3 A and Fig. 3 B, between very first time t1 to the second time t2, solar cell 2 receives sufficient sunlight, produces input voltage V
InMagnitude of voltage be 410 volts, be higher than the first setting voltage value, for example 205 volts.At this moment, the first pulse width modulating signal V
A1, the second pulse width modulating signal V
A2, the 5th pulse width modulating signal V
C1With the 6th pulse width modulating signal V
C2Be disabled state (disabled) or enabled status (enabled), for example high potential or electronegative potential, and change in the mode of pulse width modulation, and the 3rd pulse width modulating signal V
B1And the 4th pulse width modulating signal V
B2Then be continuously disabled state.Wherein, the first pulse width modulating signal V
A1With the 6th pulse width modulating signal V
C2Identical, the first pulse width modulating signal V
A1With the second pulse width modulating signal V
A2Anti-phase, the 5th pulse width modulating signal V
C1With the 6th pulse width modulating signal V
C2Anti-phase.
In other words, between very first time t1 to the second time t2, control unit 15 controls the first switch Q
A1, second switch Q
A2, the 5th switch Q
C1And the 6th switch Q
C2Work, and stop the 3rd switch Q
B1With the 4th switch Q
B2Work.During this, as the first pulse width modulating signal V
A1With the 6th pulse width modulating signal V
C2During for enabled status, the second pulse width modulating signal V
A2With the 5th pulse width modulating signal V
C1Be disabled state, input voltage V
InCan be sequentially via the first switch Q of conducting
A1With the 6th switch Q
C2Be sent to the first armature winding N
P1And the second armature winding N
P2Be connected in series the winding (N of formation
P1+ N
P2), make the first armature winding N
P1And the second armature winding N
P2Be connected in series the winding (N of formation
P1+ N
P2) receive the input voltage V of positive polarity
InAs the second pulse width modulating signal V
A2With the 5th pulse width modulating signal V
C1During for enabled status, the first pulse width modulating signal V
A1With the 6th pulse width modulating signal V
C2Be disabled state, input voltage V
InCan be sequentially via the 5th switch Q of conducting
C1With second switch Q
A2Be sent to the first armature winding N
P1And the second armature winding N
P2Be connected in series the winding (N of formation
P1+ N
P2), make the first armature winding N
P1And the second armature winding N
P2Be connected in series the winding (N of formation
P1+ N
P2) receive the input voltage V of negative polarity
In
Therefore, transformer T
rThe winding of primary side work be the first armature winding N
P1And the second armature winding N
P2Be connected in series the winding (N of formation
P1+ N
P2), input voltage V
InElectric energy can be via the first armature winding N
P1And the second armature winding N
P2Be connected in series the winding (N of formation
P1+ N
P2) be sent to secondary winding N
s, the ratio value between the magnitude of voltage of the winding of primary side work and the magnitude of voltage of primary side is the first ratio value, it equals the first armature winding N
P1And the second armature winding N
P2Be connected in series the winding (N of formation
P1+ N
P2) with the number of turn ratio (turn ratio) of secondary winding Ns.In the ratio value described in the present embodiment, its account form is transformer T
rThe equivalent number of turn of primary side Working winding divided by transformer T
rThe equivalent number of turn of primary side Working winding.
When the second time t2, the sunlight intensity that solar cell 2 receives dies down, and correspondence makes input voltage V
InMagnitude of voltage be lower than the first setting voltage value of 205 volts, at this moment, the first pulse width modulating signal V
A1, the second pulse width modulating signal V
A2, the 3rd pulse width modulating signal V
B1And the 4th pulse width modulating signal V
B2Be disabled state or enabled status, and change in the mode of pulse width modulation, and the 5th pulse width modulating signal V
C1With the 6th pulse width modulating signal V
C2Then be continuously disabled state, wherein, the first pulse width modulating signal V
A1With the 4th pulse width modulating signal V
B2Identical, the first pulse width modulating signal V
A1With the second pulse width modulating signal V
A2Anti-phase, the 3rd pulse width modulating signal V
B1With the 4th pulse width modulating signal V
B2Anti-phase.
In other words, after the second time t2, control unit 15 controls the first switch Q
A1, second switch Q
A2, the 3rd switch Q
B1And the 4th switch Q
B2Work, and stop the 5th switch Q
C1And the 6th switch Q
C2Work.During this, as the first pulse width modulating signal V
A1With the 4th pulse width modulating signal V
B2During for enabled status, the second pulse width modulating signal V
A2With the 3rd pulse width modulating signal V
B1Be disabled state, input voltage V
InCan be sequentially via the first switch Q of conducting
A1With the 4th switch Q
B2Be sent to the first armature winding N
P1, make the first armature winding N
P1Receive the input voltage V of positive polarity
InAs the second pulse width modulating signal V
A2With the 3rd pulse width modulating signal V
B1During for enabled status, the first pulse width modulating signal V
A1With the 4th pulse width modulating signal V
B2Be disabled state, input voltage V
InCan be sequentially via the 3rd switch Q of conducting
B1With second switch Q
A2Be sent to the first armature winding N
P1, make the first armature winding N
P1Receive the input voltage V of negative polarity
In
Therefore, transformer T
rPrimary side the first armature winding N is only arranged
P1At work, input voltage V
InElectric energy only via the first armature winding N
P1Be sent to secondary winding N
s, the ratio value between the magnitude of voltage of the winding of primary side work and the magnitude of voltage of primary side is the second ratio value, it equals the first armature winding N
P1Number of turn ratio with secondary winding Ns.Because, the first armature winding N
P1And the second armature winding N
P2Be connected in series the winding (N of formation
P1+ N
P2) the number of turn than the first armature winding N
P1Many, so the first ratio value can be less than the second ratio value (according to above-mentioned computational methods).For example, the first armature winding N
P1, the second armature winding N
P2And secondary winding N
sThe number of turn be respectively 2,2 and during 4 circle, the first ratio value is 1 (calculated by 4/ (2+2) and get), and the second ratio value is 2 (being got by 4/2 calculating).
Generally speaking, receive sufficient sunlight and produce the input voltage V that is higher than the first setting voltage value when solar cell 2
InThe time, control unit 15 can control the first modulation switch circuit 11a and the 3rd modulation switch circuit 11c works in the mode of pulse width modulation, and stops the second modulation switch circuit 11b work, makes transformer T
rUse the first lower ratio value (calculating according to aforesaid way) with input voltage V
InElectric energy be sent to primary side by primary side.When solar cell 2 receives weak sunlight and the corresponding input voltage V that is lower than the first setting voltage value that produces
InThe time, control unit 15 can control the first modulation switch circuit 11a and the second modulation switch circuit 11b works in the mode of pulse width modulation, and stops the 3rd modulation switch circuit 11c work, makes transformer T
rUse the second higher ratio value (calculating according to aforesaid way) with input voltage V
InElectric energy be sent to primary side by primary side.At this moment, although input voltage V
InMagnitude of voltage lower, but control unit 15 is by selecting corresponding wherein two modulation switch circuit workings to make transformer T
rUse the second higher ratio value with input voltage V
InElectric energy be sent to primary side by primary side, so the second full-wave rectified voltage V
R2Voltage peak, ac output voltage V
oVoltage effective value (rootmean square, be called for short rms) or ac output voltage V
oVoltage peak can not be subjected to the impact of sunlight intensity and be maintained load voltage value, for example 110 volts.
In some embodiment, when solar cell 2 receives weak sunlight and the corresponding input voltage V that is lower than the first setting voltage value that produces
InThe time, control unit 15 can control the second modulation switch circuit 11b and the 3rd modulation switch circuit 11c works in the mode of pulse width modulation, and stops the first modulation switch circuit 11a work, makes input voltage V
InSequentially via the 3rd switch Q of conducting
B1With the 6th switch Q
C2Be sent to the second armature winding N
P2, make the second armature winding N
P2Receive the input voltage V of positive polarity
InInput voltage V
InSequentially via the 5th switch Q of conducting
C1With the 4th switch Q
B2Be sent to the second armature winding N
P2, make the second armature winding N
P2Receive the input voltage V of negative polarity
InTransformer T
rUse the 3rd higher ratio value (calculating according to aforesaid way) with input voltage V
InElectric energy be sent to primary side by primary side.Wherein, the 3rd ratio value equals the second armature winding N
P2With secondary winding N
sNumber of turn ratio, similarly, calculating the first ratio value according to aforesaid way can be less than the 3rd ratio value, in present embodiment, the first armature winding N
P1With the second armature winding N
P2The number of turn identical, so the second ratio value equals the 3rd ratio value.
In present embodiment, the operating frequency of modulation switch circuit (11a, 11b, 11c) is 20k Hz (thousand-hertz), and the operating frequency of inverse switch circuit 14 is 60Hz, equals ac output voltage V
oFrequency, therefore, the first full-wave rectified voltage V
R1With the first full-wave rectification electric current I
R1The high frequency composition be mainly the operating frequency of modulation switch circuit (11a, 11b, 11c).And the second full-wave rectified voltage V
R2With the second full-wave rectification electric current I
R2For filter circuit 13 with the first full-wave rectified voltage V
R1With the first full-wave rectification electric current I
R1The filtering of high frequency composition after waveform, then be converted to respectively ac output voltage V by inverse switch circuit 14 again
oWith ac output current I
oWaveform.Shown in Fig. 3 B, in present embodiment, pulse width modulating signal (V
A1, V
A2, V
B1, V
B2, V
C1, V
C2) when work, the size of its duty ratio can be along with the ac output current I of sinusoidal (Sinusoid) or cosine (Cosine)
oChange, i.e. ac output current I
oThe respective pulses bandwidth modulation signals (V of peak value place to zero potential place
A1, V
A2, V
B1, V
B2, V
C1, V
C2) duty ratio change from large to small and corresponding switch (Q
A1, Q
A2, Q
B1, Q
B2, Q
C1, Q
C2, Q
S1, Q
S2, Q
S3, Q
S4) duty ratio of work also changes from large to small.
When the dc-ac conversion circuit 1 of wide input voltage value scope and custom power network 3 and electricity network system 5 parallel operation, control unit 15 can be according to ac output voltage V
oControl inverter signal (V
S1～V
S4) frequency and the operating frequency of inverse switch circuit 14 be same as ac output voltage V
o, and with ac output voltage V
oSynchronously.Wherein, the first inverter signal V
S1With the 4th inverter signal V
S4Identical, the second inverter signal V
S2With the 3rd inverter signal V
S3Identical, the first inverter signal V
S1With the second inverter signal V
S2Anti-phase, the 3rd inverter signal V
S3With the 4th inverter signal V
S4Anti-phase.
As the first inverter signal V
S1With the 4th inverter signal V
S4During for enabled status, the second inverter signal V
S2With the 3rd inverter signal V
S3Be disabled state, the second full-wave rectified voltage V
R2Can sequentially close Q via the minion of conducting
S1With the tenth switch Q
S4Be sent to custom power network 3 and electricity network system 5; Sequentially as the second inverter signal V
S2With the 3rd inverter signal V
S3During for enabled status, the first inverter signal V
S1With the 4th inverter signal V
S4Be disabled state, the second full-wave rectified voltage V
R2Can be sequentially via the 9th switch Q of conducting
S3With the 8th switch Q
S2Be sent to custom power network 3 and electricity network system 5.Therefore, the work by inverse switch circuit 14 can produce ac output voltage V
oWith ac output current I
o
In present embodiment, control unit 15 is by detecting ac output voltage V
oAnd obtain ac output voltage V
oLoad voltage value and rated frequency value, again according to the ac output voltage V that detects
oLoad voltage value and rated frequency control modulation switch circuit (11a, 11b, 11c) with the work of inverse switch circuit 14, therefore, the dc-ac conversion circuit 1 of the wide input voltage value scope of the present invention can be applicable to the electricity network system 5 of various ways simultaneously.
Please refer to Fig. 4 and cooperate Fig. 2, Fig. 3 A and Fig. 3 B, wherein Fig. 4 is the circuit diagram of dc-ac conversion circuit of the wide input voltage value scope of another preferred embodiment of the present invention.Fig. 4 and Fig. 2 difference are that the first modulation switch circuit 11a shown in Figure 4 also comprises the first body diode D
A1(body diode) and the second body diode D
A2The second modulation switch circuit 11b also comprises the 3rd body diode D
B1And limbs diode D
B2The 3rd modulation switch circuit 11c also comprises five body constituents diode D
C1, hexasomic diode D
C2, the 5th diode D
5And the 6th diode D
6And in present embodiment, switch (Q
A1, Q
A2, Q
B1, Q
B2, Q
C1, Q
C2, Q
S1, Q
S2, Q
S3, Q
S4) realize with mos field effect transistor (Metal-Oxide-Semiconductor Field-Effect Transistor, MOSFET).
Wherein, the first body diode D
A1, the second body diode D
A2, the 3rd body diode D
B1, limbs diode D
B2, five body constituents diode D
C1And hexasomic diode D
C2Be connected to the first switch Q
A1, second switch Q
A2, the 3rd switch Q
B1, the 4th switch Q
B2, the 5th switch Q
C1And the 6th switch Q
C2, be used to switch (Q
A1, Q
A2, Q
B1, Q
B2, Q
C1, Q
C2, Q
S1, Q
S2, Q
S3, Q
S4) formation transformer T when closing
rThe magnetizing current path, utilize this path with transformer T
rThe energy of setting up returns speeds action and is transmitted back to input.The 5th diode D
5With the 5th switch Q
C1Series connection, the 6th diode D
6With the 6th switch Q
C2Series connection is when the first modulation switch circuit 11a and the second modulation switch circuit 11b work and the 3rd modulation switch circuit 11c when quitting work the 5th diode D
5With the 6th diode D
6Can prevent transformer T
rThe Working winding of primary side in energy cause five body constituents diode D
C1And hexasomic diode D
C2Conducting.As for, dc-ac conversion circuit 1 working method of wide input voltage value scope is not being given unnecessary details at this similar in appearance to Fig. 2 again among Fig. 4.
Above-mentioned switch (Q
A1, Q
A2, Q
B1, Q
B2, Q
C1, Q
C2, Q
S1, Q
S2, Q
S3, Q
S4) can be but be not limited to mos field effect transistor, bipolar junction transistor (Bipolar Junction Transistor, BJT) or igbt (Insulated Gate Bipolar Transistor, and control unit 15 can use digital signal processor (DSP) or Pwm controller (PWM controller) to realize IGBT).
In sum, the dc-ac conversion circuit of wide input voltage value scope of the present invention is two-stage type, the first order is comprised of modulation switch circuit, transformer, rectification circuit and filter circuit, the second level is the inverse switch circuit, its magnitude of voltage that need not set up can the receiver voltage value excursion larger input voltage of a prime booster circuit and ac output voltage is not died down by sunlight intensity to be affected, so whole efficiency is higher and manufacturing cost is lower.In addition, the dc-ac conversion circuit of wide input voltage value scope can only cooperate solar cell and reduce bulky, price is high and the battery pack of easy care not, the outlet side of the dc-ac conversion circuit of wide input voltage value scope directly is connected in parallel in custom power network or electricity network system, the electric energy that solar cell is produced direct feed-in custom power network or electricity network system also can provide the required general electricity consumption to other users simultaneously via the electricity network system.Therefore user's own demand not only can be provided, the power source of the another kind of pattern of public's power supply also can be provided, just like a small type solar energy electricity generator independently, form distributed electric power supply system, flow into and the clean electric weight that flows out the solar power generation user by novel clean ammeter record electric energy again, make the user collect the generating expense to Utilities Electric Co., form the dwelling house electricity generation system.
Those skilled in the art should recognize change and the retouching of doing in the situation that does not break away from the scope and spirit of the present invention that the appended claim of the present invention discloses, all belong within the protection range of claim of the present invention.
Claims (26)
1. the dc-ac conversion circuit of a wide input voltage value scope, in order to receive an input voltage and to be converted to an ac output voltage, it comprises:
One transformer, the primary side of this transformer comprises a plurality of links, one first armature winding and one second armature winding, and this first armature winding and this second armature winding are connected in these a plurality of links and form the relation of being connected in series, and the primary side of this transformer comprises the level winding one time;
At least three modulation switch circuit comprise one first modulation switch circuit, one second modulation switch circuit and one the 3rd modulation switch circuit, are connected to one first link, one second link and one the 3rd link of these a plurality of links;
One rectification circuit is connected with the primary side of this transformer, in order to the voltage commutation of this secondary winding to produce one first commutating voltage, one first rectified current corresponding with it;
One filter circuit is connected with this rectification circuit, corresponding generation one second commutating voltage and its one second corresponding rectified current in order to the high frequency composition of this first commutating voltage of filtering this first rectified current corresponding with it;
One inverse switch circuit is connected with this filter circuit, is converted to this ac output voltage and its corresponding ac output current in order to this second rectified current that this second commutating voltage is corresponding with it; And
One control unit is connected with these three modulation switch circuit and this inverse switch circuit at least, in order to control these at least three modulation switch circuit and this inverse switch circuit turn-on or cut-off, makes the dc-ac conversion circuit work of this wide input voltage value scope;
Wherein, this control unit is optionally controlled two these modulation switch circuit workings according to the magnitude of voltage of this input voltage, make the electric energy of this input voltage be sent to the winding of this first armature winding, this second armature winding or its combination, so that the corresponding change of ratio value between the magnitude of voltage of the magnitude of voltage of the winding of the primary side work of this transformer and the primary side of this transformer.
2. the dc-ac conversion circuit of wide input voltage value scope as claimed in claim 1, it is characterized in that, this control unit is according to the comparative result of the magnitude of voltage of this input voltage and one first setting voltage value and optionally control two these modulation switch circuit workings, makes the electric energy of this input voltage be sent to the winding of this first armature winding, this second armature winding or its combination.
3. the dc-ac conversion circuit of wide input voltage value scope as claimed in claim 2, it is characterized in that, when the magnitude of voltage of this input voltage is higher than this first setting voltage value, this control unit controls this first modulation switch circuit and the 3rd modulation switch circuit is worked in the mode of pulse width modulation, and stop this second modulation switch circuit working, make this transformer use one first ratio value that the electric energy of this input voltage is sent to the primary side of this transformer by the primary side of this transformer, and the account form of this first ratio value is that the equivalent number of turn of winding of primary side work of this transformer is divided by the equivalent number of turn of the winding of the primary side work of this transformer.
4. the dc-ac conversion circuit of wide input voltage value scope as claimed in claim 3, it is characterized in that, when the magnitude of voltage of this input voltage was higher than this first setting voltage value, the winding of the primary side work of this transformer was connected in series the winding of formation for this first armature winding and this second armature winding.
5. the dc-ac conversion circuit of wide input voltage value scope as claimed in claim 4 is characterized in that, this first ratio value equals the number of turn ratio that this secondary winding and this first armature winding and this second armature winding are connected in series the winding of formation.
6. the dc-ac conversion circuit of wide input voltage value scope as claimed in claim 3, it is characterized in that, when the magnitude of voltage of this input voltage is lower than this first setting voltage value, this control unit controls this first modulation switch circuit and this second modulation switch circuit is worked in the mode of pulse width modulation, and stop the 3rd modulation switch circuit working, make this transformer use one second ratio value the electric energy of this input voltage to be sent to the primary side of this transformer by the primary side of this transformer.
7. the dc-ac conversion circuit of wide input voltage value scope as claimed in claim 6 is characterized in that, this second ratio value is higher than this first ratio value.
8. the dc-ac conversion circuit of wide input voltage value scope as claimed in claim 6 is characterized in that, when the magnitude of voltage of this input voltage was lower than this first setting voltage value, the winding of the primary side work of this transformer was this first armature winding.
9. the dc-ac conversion circuit of wide input voltage value scope as claimed in claim 8 is characterized in that, this second ratio value equals the number of turn ratio of this secondary winding and this first armature winding.
10. the dc-ac conversion circuit of wide input voltage value scope as claimed in claim 3, it is characterized in that, when the magnitude of voltage of this input voltage is lower than this first setting voltage value, this control unit controls this second modulation switch circuit and the 3rd modulation switch circuit is worked in the mode of pulse width modulation, and stop this first modulation switch circuit working, make this transformer use one the 3rd ratio value the electric energy of this input voltage to be sent to the primary side of this transformer by the primary side of this transformer.
11. the dc-ac conversion circuit of wide input voltage value scope as claimed in claim 10 is characterized in that, the 3rd ratio value is higher than this first ratio value.
12. the dc-ac conversion circuit of wide input voltage value scope as claimed in claim 10 is characterized in that, when the magnitude of voltage of this input voltage was lower than this first setting voltage value, the winding of the primary side work of this transformer was this second armature winding.
13. the dc-ac conversion circuit of wide input voltage value scope as claimed in claim 12 is characterized in that, the 3rd ratio value equals the number of turn ratio of this second armature winding and this secondary winding.
14. the dc-ac conversion circuit of wide input voltage value scope as claimed in claim 2 is characterized in that, this rectification circuit is bridge rectifier, comprises one first diode, one second diode, one the 3rd diode and one the 4th diode.
15. the dc-ac conversion circuit of wide input voltage value scope as claimed in claim 2 is characterized in that, this first modulation switch circuit comprises one first switch and a second switch; This second modulation switch circuit comprises one the 3rd switch and one the 4th switch; The 3rd modulation switch circuit comprises one the 5th switch and one the 6th switch, and the control end of each switch is connected with this control unit respectively.
16. the dc-ac conversion circuit of wide input voltage value scope as claimed in claim 15, it is characterized in that, when the magnitude of voltage of this input voltage is higher than this first setting voltage value, this input voltage sequentially is sent to the winding that this first armature winding and this second armature winding are connected in series formation via this first switch of conducting and the 6th switch, the winding that makes this first armature winding and this second armature winding be connected in series formation receives this input voltage of positive polarity, or this input voltage sequentially is sent to the winding that this first armature winding and this second armature winding are connected in series formation via the 5th switch of conducting and this second switch, and the winding that makes this first armature winding and this second armature winding be connected in series formation receives this input voltage of negative polarity.
17. the dc-ac conversion circuit of wide input voltage value scope as claimed in claim 16, it is characterized in that, when the magnitude of voltage of this input voltage is lower than this first setting voltage value, this input voltage sequentially is sent to this first armature winding via this first switch and the 4th switch of conducting, make this first armature winding receive this input voltage of positive polarity, or this input voltage sequentially is sent to this first armature winding via the 3rd switch and this second switch of conducting, makes this first armature winding receive this input voltage of negative polarity.
18. the dc-ac conversion circuit of wide input voltage value scope as claimed in claim 16, it is characterized in that, when the magnitude of voltage of this input voltage is lower than this first setting voltage value, this input voltage sequentially is sent to this second armature winding via the 3rd switch and the 6th switch of conducting, make this second armature winding receive this input voltage of positive polarity, or this input voltage sequentially is sent to this second armature winding via the 5th switch and the 4th switch of conducting, makes this second armature winding receive this input voltage of negative polarity.
19. the dc-ac conversion circuit of wide input voltage value scope as claimed in claim 15, it is characterized in that, this first switch, this second switch, the 3rd switch, the 4th switch, the 5th switch and the 6th switch connect with a corresponding body diode respectively, form the magnetizing current path of transformer when being used to described switch and closing, the energy that utilizes this path that this transformer is set up returns speeds action and is transmitted back to input.
20. the dc-ac conversion circuit of wide input voltage value scope as claimed in claim 15 is characterized in that, the 3rd modulation switch circuit also comprises:
One the 5th diode is connected in series with the 5th switch; And
One the 6th diode is connected in series with the 6th switch.
21. the dc-ac conversion circuit of wide input voltage value scope as claimed in claim 1 is characterized in that, this control unit selects digital signal processor or Pwm controller to realize.
22. the dc-ac conversion circuit of wide input voltage value scope as claimed in claim 1 is characterized in that, this input voltage is produced by a solar cell.
23. the dc-ac conversion circuit of wide input voltage value scope as claimed in claim 1, it is characterized in that, the dc-ac conversion circuit of this wide input voltage value scope and a custom power network or an electricity network system parallel operation, the operating frequency that this control unit is controlled this inverse switch circuit according to this ac output voltage is same as this ac output voltage, and synchronous with this ac output voltage.
24. the dc-ac conversion circuit of wide input voltage value scope as claimed in claim 23, it is characterized in that, this control unit is obtained load voltage value and the rated frequency value of this ac output voltage by detecting this ac output voltage, again according to the load voltage value of this ac output voltage that detects and the work that rated frequency is controlled each modulation switch circuit and this inverse switch circuit.
25. the dc-ac conversion circuit of wide input voltage value scope as claimed in claim 1, it is characterized in that the duty ratio when this first modulation switch circuit, this second modulation switch circuit and the 3rd modulation switch circuit working is along with peak value place to the zero potential place of this ac output current changes from large to small.
26. the dc-ac conversion circuit of wide input voltage value scope as claimed in claim 1 is characterized in that, this first commutating voltage, this first rectified current, this second commutating voltage and this second rectified current are all-wave.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010002119 CN102118115B (en) | 2010-01-05 | 2010-01-05 | Direct current-alternating current conversion circuit within range of wide input voltage value |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010002119 CN102118115B (en) | 2010-01-05 | 2010-01-05 | Direct current-alternating current conversion circuit within range of wide input voltage value |
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| CN102118115B true CN102118115B (en) | 2013-03-20 |
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| CN103078544A (en) * | 2013-01-31 | 2013-05-01 | 苏州欧姆尼克新能源科技有限公司 | Direct current/alternating current converting system |
| WO2016015330A1 (en) * | 2014-08-01 | 2016-02-04 | 冷再兴 | Fly-back dc/ac conversion circuit with plurality of windings |
| CN115276399B (en) * | 2022-09-26 | 2023-01-17 | 如果新能源科技(江苏)股份有限公司 | Power conversion device control method and power conversion device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101174797A (en) * | 2007-08-14 | 2008-05-07 | 伊博电源（杭州）有限公司 | Synchronous commutation convertor with variable turn ratio |
| CN101577509A (en) * | 2009-06-09 | 2009-11-11 | 华中科技大学 | Photovoltaic conversion system |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101174797A (en) * | 2007-08-14 | 2008-05-07 | 伊博电源（杭州）有限公司 | Synchronous commutation convertor with variable turn ratio |
| CN101577509A (en) * | 2009-06-09 | 2009-11-11 | 华中科技大学 | Photovoltaic conversion system |
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