CN104104249B - Direct current delivers stream power conversion system and its operating method - Google Patents
Direct current delivers stream power conversion system and its operating method Download PDFInfo
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- CN104104249B CN104104249B CN201310115740.5A CN201310115740A CN104104249B CN 104104249 B CN104104249 B CN 104104249B CN 201310115740 A CN201310115740 A CN 201310115740A CN 104104249 B CN104104249 B CN 104104249B
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Abstract
Stream power conversion system is delivered to change a DC input voitage into an ac output voltage the invention discloses a kind of direct current, mainly comprising a bridge-type switching circuit, an auxiliary switching circuit and a control circuit.The bridge-type switching circuit includes one first power switch, one second power switch, one the 3rd power switch and one the 4th power switch.The auxiliary switching circuit includes one the 5th power switch, one the 6th power switch, one the 7th power switch and one the 8th power switch.The control circuit produces a complementary switching signal to controlling first power switch and the 4th power switch and second power switch and the 3rd power switch respectively, and produces a complementary level signal to controlling the 6th power switch and the 7th power switch and the 5th power switch and the 8th power switch respectively.
Description
Technical field
A kind of relevant direct current of the present invention delivers stream power conversion system and its operating method, espespecially a kind of reduction parasitic capacitance
The direct current of influence of leakage current caused by voltage delivers stream power conversion system and its operating method.
Background technology
Refer to the circuit diagram that Fig. 1 is prior art full-bridge inverter.The full-bridge inverter passes through in no-voltage shape
It is under state, direct current and AC is decoupling.In theory, in zero voltage state, AN points voltage (being referred to as VAN afterwards) and BN points electricity
Pressure (being referred to as VBN afterwards) all should be DC voltage Vdc half, that is, VAN=VBN=1/2Vdc.Therefore, 2 points of A, B is total to
Mode voltage is definite value, to reach reduction leakage current Icp1, Icp2.However, leakage current Icp1, Icp2 composition is in close exchange commutation
When, due to no-voltage situation during it is longer, along with alternating voltage change greatly, therefore, cause Cp1 in parasitic capacitance, Cp2 electricity
Pressure is changed greatly, and produces fast-changing leakage current Icp1, Icp2, that is, parasitic capacitor voltage change is bigger, and leakage current is got over
Increase.In fact, because circuit element and positive and negative terminal parasitic capacitance Cp1, Cp2 is differed, and causes VAN and VBN not to be direct current
Voltage Vdc half, therefore, the non-common-mode voltage that 2 points of A, B is definite value.
Therefore, how to design a kind of direct current and deliver stream power conversion system and its operating method, pass through auxiliary switch electricity
Inductance under the composition zero-voltage state of road releases energy path, and the neutral point of auxiliary switching circuit and DC side is connected, greatly
The influence of leakage current caused by the earth reduction parasitic capacitor voltage, is to be intended to row overcomes and solved one by inventor
Big problem.
The content of the invention
The purpose of the present invention is that providing a kind of direct current delivers stream power conversion system, to overcome asking for prior art
Topic.
The direct current delivers stream power conversion system to change a DC input voitage into an ac output voltage.The direct current turns
AC power converting system comprising an input capacitance group, a bridge-type switching circuit, an auxiliary switching circuit, a filter circuit and
One control circuit.The input capacitance group includes one first electric capacity and one second electric capacity, first electric capacity and second capacitance connection
In a neutral point, and receive the DC input voitage.The bridge-type switching circuit parallel connection input capacitance group, includes one first bridge
Arm and one second bridge arm in parallel with first bridge arm, first bridge arm is by one first power switch and one second power switch
Series connection is formed, and second bridge arm is connected with one the 4th power switch by one the 3rd power switch and formed.The auxiliary switch includes one
3rd bridge arm and the four bridge legs being connected with the 3rd bridge arm, the 3rd bridge arm is by one the 5th power switch and one the 6th work(
Rate switch series connection is formed, and the four bridge legs are connected with one the 8th power switch by one the 7th power switch and formed, the 3rd bridge arm
Midpoint and neutral point of first bridge arm are connected, the four bridge legs connect midpoint and neutral point of second bridge arm.The filter
Wave circuit include one first filter inductance, one second filter inductance and a filter capacitor, the filter capacitor be connected to this first
Between the output end of filter inductance and the output end of second filter inductance, first filter inductance connects first bridge arm with being somebody's turn to do
3rd bridge arm, second filter inductance connects second bridge arm and the four bridge legs.The control circuit produces a complementary switching letter
Number pair with a complementary level signal pair, wherein the complementary switching signal to controlling first power switch and the 4th power respectively
Switch and second power switch and the 3rd power switch, the complementary level signal to controlling the 6th power switch respectively
With the 7th power switch and the 5th power switch and the 8th power switch.Wherein, the auxiliary switching circuit, which is provided, is somebody's turn to do
First filter inductance releases energy path with second filter inductance, is made with the parasitic capacitance effect for reducing the DC input voitage
Into leakage current.
The direct current delivers stream power conversion system to change a DC input voitage into an ac output voltage.The direct current turns
AC power converting system includes an input capacitance group, one first bridge-type switching circuit, one first auxiliary switching circuit, one second
Bridge-type switching circuit, one second auxiliary switching circuit, one first filter circuit, one second filter circuit and a control circuit.
The input capacitance group includes one first electric capacity and one second electric capacity, first electric capacity and second capacitance connection in a neutral point,
And receive the DC input voitage.The first bridge-type switching circuit parallel connection input capacitance group, comprising one first bridge arm and
One second bridge arm in parallel with first bridge arm, first bridge arm is by one first power switch and one the 9th Diode series shape
Into second bridge arm is formed by one second power switch with 1 the tenth Diode series.First auxiliary switching circuit includes one
3rd bridge arm and the four bridge legs being connected with the 3rd bridge arm, the 3rd bridge arm is by one the 3rd power switch and 1 the 11st
Diode series are formed, and the four bridge legs are formed by one the 4th power switch and 1 the 12nd Diode series, the 3rd bridge arm
The midpoint of first bridge arm is connected, the four bridge legs connect the midpoint of second bridge arm, the 3rd bridge arm and the four bridge legs
Tie point connects the neutral point.The second bridge-type switching circuit parallel connection input capacitance group, comprising one the 5th bridge arm and with this
5th bridge arm, one the 6th bridge arm in parallel, the 5th bridge arm is formed by one the 5th power switch and 1 the 13rd Diode series,
6th bridge arm is formed by one the 6th power switch and 1 the 14th Diode series.Second auxiliary switching circuit includes one the
Seven bridge arms and one the 8th bridge arm being connected with the 7th bridge arm, the 7th bridge arm is by one the 7th power switch and 1 the 15th
Pole pipe is connected to be formed, and the 8th bridge arm is formed by one the 8th power switch and 1 the 16th Diode series, and the 7th bridge arm connects
The midpoint of the 5th bridge arm is connect, the 8th bridge arm connects the midpoint of the 6th bridge arm, the company of the 7th bridge arm and the 8th bridge arm
Contact connects the neutral point.First filter circuit includes one first filter inductance, one second filter inductance and a filtered electrical
Hold, the filter capacitor is connected between the output end of the output end of first filter inductance and second filter inductance, and this first
Filter inductance connects first bridge arm and the 3rd bridge arm, and second filter inductance connects second bridge arm and the four bridge legs.
Second filter circuit includes one the 3rd filter inductance, one the 4th filter inductance and the filter capacitor, filter capacitor connection
Between the output end of the 3rd filter inductance and the output end of the 4th filter inductance, the 3rd filter inductance connects the 5th
Bridge arm and the 7th bridge arm, the 4th filter inductance connect the 6th bridge arm and the 8th bridge arm.It is mutual that the control circuit produces one
Switching signal pair and a complementary level signal pair are mended, wherein the complementary switching signal to controlling first power switch with being somebody's turn to do respectively
Second power switch and the 5th power switch and the 6th power switch, the complementary level signal to controlling the 3rd respectively
Power switch and the 4th power switch and the 7th power switch and the 8th power switch.Wherein, first auxiliary is opened
First filter inductance that powered-down road is provided releases energy path with second filter inductance, and second auxiliary switching circuit is provided should
3rd filter inductance releases energy path with the 4th filter inductance, is made with the parasitic capacitance effect for reducing the DC input voitage
Into leakage current.
The yet another object of the present invention is to provide the operating method that a kind of direct current delivers stream power conversion system, to overcome
Problem of the prior art.
The direct current delivers stream power conversion system to change a DC input voitage into an ac output voltage, the operation side
Method is comprised the steps of：(a) an input capacitance group is provided, the DC input voitage is received, the input capacitance group includes one first
Electric capacity and one second electric capacity, first electric capacity is with second capacitance connection in a neutral point；(b) a bridge-type switching circuit is provided,
The input capacitance group in parallel, the bridge-type switching circuit includes one first bridge arm and one second bridge in parallel with first bridge arm
Arm, first bridge arm is connected with one second power switch by one first power switch and formed, and second bridge arm is by one the 3rd power
Switch connects to be formed with one the 4th power switch；(c) auxiliary switching circuit is provided, the neutral point is connected to and switches with the bridge-type
Between circuit, the auxiliary switching circuit includes one the 3rd bridge arm and the four bridge legs being connected with the 3rd bridge arm, the 3rd
Bridge arm is connected with one the 6th power switch by one the 5th power switch and formed, and the four bridge legs are by one the 7th power switch and one
Eight power switch connect to be formed；(d) filter circuit is provided, the bridge-type switching circuit and the auxiliary switching circuit, the filter is connected
Wave circuit includes one first filter inductance, one second filter inductance and a filter capacitor；(e) provide one and control circuit, produce
One complementary switching signal pair and a complementary level signal pair, wherein the complementary switching signal to controlling first power switch respectively
With the 4th power switch and second power switch and the 3rd power switch, the complementary level signal to controlling this respectively
6th power switch and the 7th power switch and the 5th power switch and the 8th power switch.
The inductance being made up of the auxiliary switching circuit under zero-voltage state release can path, and by the auxiliary switching circuit
It is connected with the neutral point of DC side, also, first electric capacity due to series connection and the second electric capacity clamp voltage are in no-voltage
Just it is the half of the DC input voitage under state, so, it is possible leakage current caused by greatly reducing parasitic capacitor voltage
Influence.
In order to be able to be further understood that the present invention, to reach technology, means and effect that predetermined purpose is taken, is referred to
Below in connection with detailed description of the invention and accompanying drawing, it is believed that the purpose of the present invention, feature and feature, when can thus one deeply and
It is specific to understand, but institute's accompanying drawings are only provided and used with reference to explanation, not for being any limitation as to the present invention.
Brief description of the drawings
Fig. 1 is the circuit diagram of prior art full-bridge inverter；
Fig. 2 is the circuit diagram that direct current of the present invention delivers stream power conversion system first embodiment；
Fig. 3 is the switch control si anal waveforms figure of DC-AC converting system first embodiment of the present invention；
Fig. 4 A are circuit diagram when DC-AC converting system first embodiment of the present invention is positive half cycle stored energy operation；
Fig. 4 B are that DC-AC converting system first embodiment of the present invention is that positive half cycle releases circuit diagram when can operate；
Fig. 5 A are circuit diagram when DC-AC converting system first embodiment of the present invention is negative half period stored energy operation；
Fig. 5 B are that DC-AC converting system first embodiment of the present invention is that negative half period releases circuit diagram when can operate；
Fig. 6 is the circuit diagram that direct current of the present invention delivers stream power conversion system second embodiment；
Fig. 7 is the switch control si anal waveforms figure of DC-AC converting system second embodiment of the present invention；
Fig. 8 A are circuit diagram when DC-AC converting system second embodiment of the present invention is positive half cycle stored energy operation；
Fig. 8 B are that DC-AC converting system second embodiment of the present invention is that positive half cycle is released and obtains circuit diagram when can operate；
Fig. 9 A are circuit diagram when DC-AC converting system second embodiment of the present invention is negative half period stored energy operation；
Fig. 9 B are that DC-AC converting system second embodiment of the present invention is that negative half period releases circuit diagram when can operate；And
Figure 10 is the flow chart that direct current of the present invention delivers stream power conversion system operating method.
Wherein, description of reference numerals is as follows：
﹝ Xian You Ji Shu ﹞
Vdc DC input voitages
Vac ac output voltages
C1a input capacitances
S1a~S6a power switch
D1a~D6a diodes
L1a, L2a outputting inductance
Ca output capacitances
Cp1, Cp2 parasitic capacitance
Icp1, Icp2 leakage current
﹝ this Fa Ming ﹞
Vdc DC input voitages
Vac ac output voltages
11 input capacitance groups
12 bridge-type switching circuits
13 auxiliary switching circuits
14 filter circuits
15 control circuits
The electric capacity of C11 first
The electric capacity of C12 second
Po neutral points
The bridge arms of L11 first
The bridge arms of L12 second
The bridge arms of L13 the 3rd
L14 four bridge legs
The power switch of S11 first
The power switch of S12 second
The power switch of S13 the 3rd
The power switch of S14 the 4th
The power switch of S15 the 5th
The power switch of S16 the 6th
The power switch of S17 the 7th
The power switch of S18 the 8th
The diodes of D11 first
The diodes of D12 second
The diodes of D13 the 3rd
The diodes of D14 the 4th
The diodes of D15 the 5th
The diodes of D16 the 6th
The diodes of D17 the 7th
The diodes of D18 the 8th
The filter inductances of G11 first
The filter inductances of G12 second
C10 filter capacitors
21 input capacitance groups
221 first bridge-type switching circuits
222 second bridge-type switching circuits
231 first auxiliary switching circuits
232 second auxiliary switching circuits
241 first filter circuits
242 second filter circuits
25 control circuits
The electric capacity of C21 first
The electric capacity of C22 second
Po neutral points
The bridge arms of L211 first
The bridge arms of L221 second
The bridge arms of L231 the 3rd
L241 four bridge legs
The bridge arms of L212 the 5th
The bridge arms of L222 the 6th
The bridge arms of L232 the 7th
The bridge arms of L242 the 8th
The power switch of S211 first
The power switch of S221 second
The power switch of S231 the 3rd
The power switch of S241 the 4th
The diodes of D211 first
The diodes of D221 second
The diodes of D231 the 3rd
The diodes of D241 the 4th
The diodes of D251 the 9th
The diodes of D261 the tenth
The diodes of D271 the 11st
The diodes of D281 the 12nd
The filter inductances of G211 first
The filter inductances of G221 second
C20 filter capacitors
The power switch of S212 the 5th
The power switch of S222 the 6th
The power switch of S232 the 7th
The power switch of S242 the 8th
The diodes of D212 the 5th
The diodes of D222 the 6th
The diodes of D232 the 7th
The diodes of D242 the 8th
The diodes of D252 the 13rd
The diodes of D262 the 14th
The diodes of D272 the 15th
The diodes of D282 the 16th
The filter inductances of G212 the 3rd
The filter inductances of G222 the 4th
Lps1, Lns1 energy storage path
Lpr1, Lnr1 are released can path
Lps2, Lns2 energy storage path
Lpr2, Lnr2 are released can path
Sc1, Sc4 switching signal
Sc2, Sc3 switching signal
Sc5, Sc8 level signal
Sc6, Sc7 level signal
Sc11, Sc21 switching signal
Sc12, Sc22 switching signal
Sc31, Sc41 level signal
Sc32, Sc42 level signal
T0, t1, the t2 time
S10~S50 steps
Embodiment
Hereby the technical content and a detailed description for the present invention, coordinate schema to be described as follows：
Refer to the circuit diagram that Fig. 2 delivers stream power conversion system first embodiment for direct current of the present invention.The direct current is delivered
Power conversion system is flowed to change a DC input voitage Vdc into an ac output voltage Vac.The direct current delivers stream Power convert
System includes an input capacitance group 11, a bridge-type switching circuit 12, an auxiliary switching circuit 13, a filter circuit 14 and a control
Circuit 15 processed.The input capacitance group 11 receives DC input voitage Vdc, includes one first electric capacity C11 and one second electric capacity
C12, the first electric capacity C11 and second electric capacity C12 are connected to a neutral point Po, to maintain the electricity of the first electric capacity C11 and second
The cross-pressure for holding C12 is respectively equal to DC input voitage Vdc half.The bridge-type switching circuit 12 input capacitance group in parallel
11, comprising one first bridge arm L11 and the one second bridge arm L12 in parallel with first bridge arm L11, first bridge arm L11 is by one
First power switch S11 connects to be formed with one second power switch S12, the second bridge arm L12 by one the 3rd power switch S13 with
One the 4th power switch S14 connects to be formed.In the present embodiment, the bridge-type switching circuit 12 is a full-bridge type switching circuit.Should
Auxiliary switching circuit 13 is connected between neutral point Po and the bridge-type switching circuit 12, comprising one the 3rd bridge arm L13 and with
One four bridge legs L14 of the 3rd bridge arm L13 connections, the 3rd bridge arm L13 is by one the 5th power switch S15 and one the 6th power
Switch S16 is connected to be formed, and the four bridge legs L14 is connected with one the 8th power switch S18 by one the 7th power switch S17 and formed.
The filter circuit 14 connects the bridge-type switching circuit 12 and the auxiliary switching circuit 13, includes one first filter inductance
G11, one second filter inductance G12 and a filter capacitor C10.The control circuit 15 produce a complementary switching signal to (Sc1,
Sc4 and Sc2, Sc3) with a complementary level signal to (Sc6, Sc7 and Sc5, Sc8), wherein the complementary switching signal to (Sc1,
Sc4 and Sc2, Sc3) the first power switch S11 and the 4th power switch S14 and second power switch are controlled respectively
S12 and the 3rd power switch S13, the complementary level signal controls the 6th power to open respectively to (Sc6, Sc7 and Sc5, Sc8)
Close S16 and the 7th power switch S17 and the 5th power switch S15 and the 8th power switch S18.Furthermore, the bridge-type
First power switch S11, second power switch S12, the 3rd power switch S13 and the 4th work(of switching circuit 12
A rate switch S14 correspondences diode in parallel, respectively one first diode D11, one second diode D12, one the 3rd diode
D13 and one the 4th diode D14；5th power switch S15 of the auxiliary switching circuit 13, the 6th power switch S16,
7th power switch S17 and a 8th power switch S18 correspondences diode in parallel, respectively one the 5th diode D15,
One the 6th diode D16, one the 7th diode D17 and one the 8th diode D18.Stream Power convert system is delivered as the direct current
The operating instruction of system, by there is detailed elaboration hereinafter.
It is respectively that direct current of the present invention delivers stream power conversion system first embodiment for positive half cycle to refer to Fig. 4 A and Fig. 4 B
Energy storage is with releasing circuit diagram when can operate, and it is DC-AC converting system first embodiment of the present invention to coordinate referring to Fig. 3
Switch control si anal waveforms figure.Ac output voltage Vac is positive half cycle operation (time t0~t1 is interval), the control circuit 15
The complementary switching signal is produced to (Sc1, Sc4 and Sc2, Sc3), with switching control the first power switch S11 and the 4th work(
Rate switchs S14 and low level ends the second power switch S12 and the 3rd power switch S13, and produces the complementary electrical
Ordinary mail number to (Sc6, Sc7 and Sc5, Sc8), with high level turn on the 6th power switch S16 and the 7th power switch S17 with
And low level ends the 5th power switch S15 and the 8th power switch S18.As shown in Figure 4 A, if first filter inductance
When G11 and second filter inductance G12 is stored energy operation, the direct current delivers stream power conversion system one tank circuit Lps1 sequentially
For DC input voitage Vdc, first power switch S11, first filter inductance G11, ac output voltage Vac, should
Second filter inductance G12, the 4th power switch S14, return DC input voitage Vdc.As shown in Figure 4 B, if this first
When filter inductance G11 and second filter inductance G12 can operate to release, the direct current delivers stream power conversion system one and releases energy loop
Lpr1 is sequentially that first filter inductance G11, ac output voltage Vac, second filter inductance G12, the 7th power are opened
S17, the 8th diode D18, the 6th power switch S16, the 5th diode D15 are closed, first filter inductance is returned
G11。
It is respectively that direct current of the present invention delivers stream power conversion system first embodiment for negative half period to refer to Fig. 5 A and Fig. 5 B
Energy storage is with releasing circuit diagram when can operate.Ac output voltage Vac is negative half period operation (time t1~t2 is interval), the control
Circuit 15 produces the complementary switching signal to (Sc2, Sc3 and Sc1, Sc4), with switching control the second power switch S12 with being somebody's turn to do
3rd power switch S13 and low level end the first power switch S11 and the 4th power switch S14, and generation should
Complementary level signal turns on the 5th power switch S15 to (Sc5, Sc8 and Sc6, Sc7), with high level and opened with the 8th power
Close S18 and low level ends the 6th power switch S16 and the 7th power switch S17.As shown in Figure 5A, if first filter
When ripple inductance G11 and second filter inductance G12 is stored energy operation, the direct current delivers the stream tank circuit of power conversion system one
Lns1 is sequentially DC input voitage Vdc, the 3rd power switch S13, second filter inductance G12, exchange output electricity
Vac, first filter inductance G11, second power switch S12 are pressed, DC input voitage Vdc is returned.As shown in Figure 5 B,
If the first filter inductance G11 and second filter inductance G12 can operate to release, the direct current delivers stream power conversion system one
Release can loop Lnr1 be sequentially second filter inductance G12, ac output voltage Vac, first filter inductance G11, this
Five power switch S15, the 6th diode D16, the 8th power switch S18, the 7th diode D17, return this second
Filter inductance G12.
Refer to the circuit diagram that Fig. 6 delivers stream power conversion system second embodiment for direct current of the present invention.The direct current is delivered
Power conversion system is flowed to change a DC input voitage Vdc into an ac output voltage Vac.The direct current delivers stream Power convert
System includes an input capacitance group 21, one first bridge-type switching circuit 221, one first auxiliary switching circuit 231, one second bridge-type
Switching circuit 222, one second auxiliary switching circuit 232, one first filter circuit 241, one second filter circuit 242 and a control
Circuit 25 processed.The input capacitance group 21 receives DC input voitage Vdc, includes one first electric capacity C21 and one second electric capacity
C22, the first electric capacity C21 and second electric capacity C22 are connected to a neutral point Po, to maintain the electricity of the first electric capacity C11 and second
The cross-pressure for holding C12 is respectively equal to DC input voitage Vdc half.The first bridge-type switching circuit 221 input electricity in parallel
Appearance group 21, comprising one first bridge arm L211 and the one second bridge arm L221 in parallel with first bridge arm L211, first bridge arm
L211 is connected with one the 9th diode D251 by one first power switch S211 and formed, and the second bridge arm L221 is by one second power
Switch S221 connects to be formed with 1 the tenth diode D261.First auxiliary switching circuit 231 comprising one the 3rd bridge arm L231 with
And the four bridge legs L241 being connected with the 3rd bridge arm L231, the 3rd bridge arm L231 is by one the 3rd power switch S231 and one
11st diode D271 connects to be formed, and the four bridge legs L241 is by one the 4th power switch S241 and 1 the 12nd diode
D281 connects to be formed, and the 3rd bridge arm L231 connects first bridge arm L211 midpoint, the four bridge legs L241 connect this second
Bridge arm L221 midpoint, the 3rd bridge arm L231 is connected neutral point Po with the tie point of the four bridge legs L241.
The input capacitance group 21 in parallel of the second bridge-type switching circuit 222, comprising one the 5th bridge arm L212 and with this
One the 6th bridge arm L222 in parallel five bridge arm L212, the 5th bridge arm L212 is by one the 5th power switch S212 and 1 the 13rd
Pole pipe D252 is connected to be formed, and the 6th bridge arm L222 is connected shape by one the 6th power switch S222 with 1 the 14th diode D262
Into.Second auxiliary switching circuit 232 includes one the 7th bridge arm L232 and one the 8th bridge being connected with the 7th bridge arm L232
Arm L242, the 7th bridge arm L232 are connected with 1 the 15th diode D272 by one the 7th power switch S232 and formed, and the 8th
Bridge arm L242 is connected with 1 the 16th diode D282 by one the 8th power switch S242 and formed, and the 7th bridge arm L232 connections should
5th bridge arm L212 midpoint, the 8th bridge arm L242 connects the 6th bridge arm L222 midpoint, and the 7th bridge arm L232 is with being somebody's turn to do
8th bridge arm L242 tie point connects neutral point Po.
First filter circuit 241, connects the first bridge-type switching circuit 221 and first auxiliary switching circuit 231, bag
Containing one first filter inductance G211, one second filter inductance G221 and a filter capacitor C20.Second filter circuit 242, even
The second bridge-type switching circuit 222 and second auxiliary switching circuit 232 are connect, one the 3rd filter inductance G212, one the 4th is included
Filter inductance G222 and filter capacitor C20.The control circuit 25 produce a complementary switching signal to (Sc11, Sc21,
Sc12, Sc22) with a complementary level signal to (Sc31, Sc41, Sc32, Sc42), wherein the complementary switching signal to (Sc11,
Sc21, Sc12, Sc22) the first power switch S211 of the first bridge-type switching circuit 221 and second power are controlled respectively
S221 and the 5th power switch S212 and the 6th power switch S222 of the second bridge-type switching circuit 222 is switched, should
Complementary level signal controls (Sc31, Sc41, Sc32, Sc42) the 3rd power of first auxiliary switching circuit 231 respectively
The 7th power switch S232 of S231 and the 4th power switch S241 and second auxiliary switching circuit 232 is switched with being somebody's turn to do
8th power switch S242.Furthermore, the first power switch S211 and second power of the first bridge-type switching circuit 221 are opened
Close a S221 correspondences diode in parallel, respectively one first diode D211 and one second diode D221；First auxiliary is opened
A 3rd power switch S231 diodes in parallel corresponding with the 4th power switch S241 on powered-down road 231, respectively 1
Three diode D231 and one the 4th diode D241；5th power switch S212 of the second bridge-type switching circuit 222 is with being somebody's turn to do
A 6th power switch S222 correspondences diode in parallel, respectively one the 5th diode D212 and one the 6th diode D222；Should
A the 7th power switch S232 diodes in parallel corresponding with the 8th power switch S242 for second auxiliary switching circuit 232,
Respectively one the 7th diode D232 and one the 8th diode D242.The operation for delivering stream power conversion system as the direct current is said
It is bright, by there is detailed elaboration hereinafter.
It is respectively that direct current of the present invention delivers stream power conversion system second embodiment for positive half cycle to refer to Fig. 8 A and Fig. 8 B
Energy storage is with releasing circuit diagram when can operate.And it is DC-AC converting system second embodiment of the present invention to coordinate referring to Fig. 7
Switch control si anal waveforms figure.Ac output voltage Vac is positive half cycle operation (time t0~t1 is interval), the control circuit 25
The complementary switching signal is produced to (Sc11, Sc21, Sc12, Sc22), with being somebody's turn to do for switching control the first bridge-type switching circuit 221
First power switch S211 and the second power switch S221 and low level end the second bridge-type switching circuit 222 this
Five power switch S212 and the 6th power switch S222, and produce the complementary level signal to (Sc31, Sc41, Sc32,
Sc42), the 3rd power switch S231 and the 4th power switch of first auxiliary switching circuit 231 are turned on high level
S241 and low level end the 7th power switch S232 and the 8th power switch of second auxiliary switching circuit 232
S242.As shown in Figure 8 A, if the first filter inductance G211 and second filter inductance G221 is stored energy operation, the direct current turns
The tank circuit Lps2 of AC power converting system one be sequentially DC input voitage Vdc, first power switch S211, this
One filter inductance G211, ac output voltage Vac, the second filter inductance G221 and second power switch S221, then
Return to DC input voitage Vdc.As shown in Figure 8 B, if the first filter inductance G211 and second filter inductance G221 is to release
When can operate, it is sequentially first filter inductance G211, the friendship that the direct current, which delivers stream power conversion system one and releases energy loop Lpr2,
Flow output voltage Vac, second filter inductance G221, the 4th power switch S241, the 12nd diode D281, the 3rd
Power switch S231 and the 11st diode D271, returns first filter inductance G211.
It is respectively that direct current of the present invention delivers stream power conversion system second embodiment for negative half period to refer to Fig. 9 A and Fig. 9 B
Energy storage is with releasing circuit diagram when can operate.Ac output voltage Vac is negative half period operation (time t1~t2 is interval), the control
Circuit 25 produces the complementary switching signal to (Sc12, Sc22, Sc11, Sc21), with switching control the second bridge-type switching circuit
222 the 5th power switch S212 ends the first bridge-type switching circuit with the 6th power switch S222 and low level
221 the first power switch S211 and second power switch S221, and produce the complementary level signal to (Sc32,
Sc42, Sc31, Sc41), the 7th power switch S232 and the 8th of second auxiliary switching circuit 232 is turned on high level
Power switch S242 and low level end the 3rd power switch S231 and the 4th work(of first auxiliary switching circuit 231
Rate switchs S241.As shown in Figure 9 A, should if the 3rd filter inductance G212 and the 4th filter inductance G222 is stored energy operation
It is sequentially DC input voitage Vdc, the 5th power switch that direct current, which delivers the stream tank circuit Lns2 of power conversion system one,
S212, the 3rd filter inductance G212, ac output voltage Vac, the 4th filter inductance G222 and the 6th power are opened
S222 is closed, DC input voitage Vdc is returned.As shown in Figure 9 B, if the 3rd filter inductance G212 and the 4th filtered electrical
When sense G222 can operate to release, it is sequentially the 3rd filter inductance that the direct current, which delivers stream power conversion system one and releases energy loop Lnr2,
G212, ac output voltage Vac, the 4th filter inductance G222, the 8th power switch S242, the 16th diode
D282, the 7th power switch S232 and the 15th diode D272, return the 3rd filter inductance G212.
Refer to the flow chart that Figure 10 delivers stream power conversion system operating method for direct current of the present invention.The direct current delivers stream
Power conversion system is to change a DC input voitage into an ac output voltage, and the operating method is comprised the steps of：(a) carry
For an input capacitance group, the DC input voitage is received, the input capacitance group includes one first electric capacity and one second electric capacity, this
One electric capacity, in a neutral point, is respectively equal to this straight with second capacitance connection with the cross-pressure for maintaining first electric capacity and the second electric capacity
Flow the half (S10) of input voltage.Then there is provided a bridge-type switching circuit, the input capacitance group in parallel, the bridge-type switching circuit
Comprising one first bridge arm and one second bridge arm in parallel with first bridge arm, first bridge arm is by one first power switch and one
Second power switch is connected to be formed, and second bridge arm is connected with one the 4th power switch by one the 3rd power switch and formed (S20).
Wherein, first power switch, second power switch, the 3rd power switch and the 4th power switch correspondence parallel connection one
Diode, respectively one first diode, one second diode, one the 3rd diode and one the 4th diode.
Then there is provided an auxiliary switching circuit, it is connected between the neutral point and the bridge-type switching circuit, the auxiliary switch
Circuit includes one the 3rd bridge arm and the four bridge legs being connected with the 3rd bridge arm, and the 3rd bridge arm is by one the 5th power switch
Connect to be formed with one the 6th power switch, the four bridge legs are connected with one the 8th power switch by one the 7th power switch and formed
(S30).Wherein, the 5th power switch, the 6th power switch, the 7th power switch and the 8th power switch correspondence
A diode in parallel, respectively one the 5th diode, one the 6th diode, one the 7th diode and one the 8th diode.So
Afterwards there is provided a filter circuit, the bridge-type switching circuit and the auxiliary switching circuit are connected, the filter circuit includes one first filtering
Inductance, one second filter inductance and a filter capacitor (S40).Then there is provided a control circuit, a complementary switching signal is produced
Pair with a complementary level signal pair, wherein the complementary switching signal to controlling first power switch and the 4th power to open respectively
Close and second power switch and the 3rd power switch, the complementary level signal to control respectively the 6th power switch with
7th power switch and the 5th power switch and the 8th power switch (S50).
When the ac output voltage operates for positive half cycle, the control circuit produces the complementary switching signal pair, to switch control
Make first power switch and end second power switch and the 3rd power switch with the 4th power switch and low level,
And the complementary level signal pair is produced, the 6th power switch and the 7th power switch and low level are turned on high level
End the 5th power switch and the 8th power switch；When first filter inductance and second filter inductance are stored energy operation
When, the direct current deliver the stream tank circuit of power conversion system one be sequentially the DC input voitage, first power switch, this
One filter inductance, the ac output voltage, second filter inductance and the 4th power switch are constituted.
When the ac output voltage operates for positive half cycle, the control circuit produces the complementary switching signal pair, to switch control
Make first power switch and end second power switch and the 3rd power switch with the 4th power switch and low level,
And the complementary level signal pair is produced, the 6th power switch and the 7th power switch and low level are turned on high level
End the 5th power switch and the 8th power switch；When first filter inductance and second filter inductance are to release and can operate
When, the direct current deliver stream power conversion system one release can loop be sequentially first filter inductance, the ac output voltage, this
Two filter inductances, the 7th power switch, the 8th diode, the 6th power switch and the 5th diode are constituted.
When the ac output voltage operates for negative half period, the control circuit produces the complementary switching signal pair, to switch control
Make second power switch and end first power switch and the 4th power switch with the 3rd power switch and low level,
And the complementary level signal pair is produced, the 5th power switch and the 8th power switch and low level are turned on high level
End the 6th power switch and the 7th power switch；When first filter inductance and second filter inductance are stored energy operation
When, the direct current deliver the stream tank circuit of power conversion system one be sequentially the DC input voitage, the 3rd power switch, this
Two filter inductances, the ac output voltage, first filter inductance and second power switch are constituted.
When the ac output voltage operates for negative half period, the control circuit produces the complementary switching signal pair, to switch control
Make second power switch and end first power switch and the 4th power switch with the 3rd power switch and low level,
And the complementary level signal pair is produced, the 5th power switch and the 8th power switch and low level are turned on high level
End the 6th power switch and the 7th power switch；When first filter inductance and second filter inductance are to release and can operate
When, the direct current deliver stream power conversion system one release can loop be sequentially second filter inductance, the ac output voltage, this
One filter inductance, the 5th power switch, the 6th diode, the 8th power switch and the 7th diode are constituted.
In summary, the present invention has following feature and advantage：
The inductance being made up of the auxiliary switching circuit under zero-voltage state release can path, and by the auxiliary switching circuit
It is connected with the neutral point of DC side, also, first electric capacity due to series connection and the second electric capacity strangulation VAN and VBN voltages
In the half under zero-voltage state being just the DC input voitage, in this way, VAN and VBN common-mode voltage is definite value, can be significantly
The influence of leakage current caused by ground reduction parasitic capacitor voltage.
Only, it is described above, be only preferred embodiment of the present invention detailed description and schema, only the present invention feature simultaneously
This is not limited to, and is not used to the limitation present invention, all scopes of the invention should apply for a patent right claimed range with described
It is defined, the embodiment of all spirit changes similar with its together in the present patent application scope of the patent claims should all be contained in this
In the category of invention, any those skilled in the art in the field of the invention, can think easily and change or modification can all contain
Cover the right in this case.
Claims (10)
1. a kind of direct current delivers stream power conversion system, to change a DC input voitage into an ac output voltage；The direct current
Stream power conversion system is delivered to include：
One input capacitance group, comprising one first electric capacity and one second electric capacity, first electric capacity and second capacitance connection one are neutral
Point, and receive the DC input voitage；
One bridge-type switching circuit, in parallel input capacitance group includes one first bridge arm and in parallel with first bridge arm 1 the
Two bridge arms, first bridge arm is connected with one second power switch by one first power switch and formed, and second bridge arm is by one the 3rd
Power switch connects to be formed with one the 4th power switch；
One auxiliary switching circuit, includes one the 3rd bridge arm and a four bridge legs in parallel with the 3rd bridge arm, the 3rd bridge arm
Connected and formed with one the 6th power switch by one the 5th power switch, the four bridge legs are by one the 7th power switch and one the 8th work(
Rate switch series connection is formed, and the 3rd bridge arm connects the midpoint of first bridge arm and the neutral point, the four bridge legs connect this second
The midpoint of bridge arm and the neutral point；
One filter circuit, includes one first filter inductance, one second filter inductance and a filter capacitor, filter capacitor connection
Between the output end of first filter inductance and the output end of second filter inductance, first filter inductance connect this first
Bridge arm and the 3rd bridge arm, second filter inductance connect second bridge arm and the four bridge legs；And
One controls circuit, produces a complementary switching signal pair and a complementary level signal pair, wherein the complementary switching signal is to dividing
First power switch and the 4th power switch and second power switch and the 3rd power switch, the complementation are not controlled
Level signal to controlling the 6th power switch and the 7th power switch and the 5th power switch and the 8th work(respectively
Rate is switched；
Wherein, the auxiliary switching circuit provide first filter inductance and second filter inductance release can path, so that reduce should
Leakage current caused by the parasitic capacitance effect of DC input voitage；
First electric capacity and second capacitance connection are in a neutral point, to maintain the cross-pressure of first electric capacity and the second electric capacity to distinguish
Equal to the half of the DC input voitage；
First power switch, second power switch, the 3rd power switch and the 4th work(of the bridge-type switching circuit
Rate switch difference one first diode in parallel, one second diode, one the 3rd diode and one the 4th diode；The auxiliary is opened
5th power switch, the 6th power switch, the 7th power switch and the 8th power switch difference on powered-down road are simultaneously
Join one the 5th diode, one the 6th diode, one the 7th diode and one the 8th diode；And
When the ac output voltage is that positive half cycle is operated, the control circuit produces the complementary switching signal pair, with switching control
First power switch ends second power switch and the 3rd power switch with the 4th power switch and low level, and
And the complementary level signal pair is produced, turn on the 6th power switch with high level cuts with the 7th power switch and low level
Only the 5th power switch and the 8th power switch；Or when the ac output voltage is that negative half period is operated, control electricity
Road system produces the complementary switching signal pair, is cut with switching control second power switch and the 3rd power switch and low level
Only first power switch and the 4th power switch, and produce the complementary level signal pair, the 5th is turned on high level
Power switch ends the 6th power switch and the 7th power switch with the 8th power switch and low level.
2. direct current as claimed in claim 1 delivers stream power conversion system, wherein when the ac output voltage is grasped for positive half cycle
Make and when first filter inductance and second filter inductance are stored energy operation, the direct current delivers the stream energy storage of power conversion system one
Loop sequentially by the DC input voitage, first power switch, first filter inductance, the ac output voltage, this second
Filter inductance and the 4th power switch are constituted.
3. direct current as claimed in claim 1 delivers stream power conversion system, wherein when the ac output voltage is grasped for positive half cycle
Make and first filter inductance and second filter inductance are that the direct current delivers stream power conversion system one and releases energy when releasing to operate
Loop system sequentially by first filter inductance, the ac output voltage, second filter inductance, the 7th power switch, this
Eight diodes, the 6th power switch and the 5th diode are constituted.
4. direct current as claimed in claim 1 delivers stream power conversion system, wherein when the ac output voltage is grasped for negative half period
Make and when first filter inductance and second filter inductance are stored energy operation, the direct current delivers the stream energy storage of power conversion system one
Loop sequentially by the DC input voitage, the 3rd power switch, second filter inductance, the ac output voltage, this first
Filter inductance and second power switch are constituted.
5. direct current as claimed in claim 1 delivers stream power conversion system, wherein when the ac output voltage is grasped for negative half period
Make and first filter inductance and second filter inductance are that the direct current delivers stream power conversion system one and releases energy when releasing to operate
Loop is sequentially by second filter inductance, the ac output voltage, first filter inductance, the 5th power switch, the 6th
Diode, the 8th power switch and the 7th diode are constituted.
6. a kind of direct current delivers stream power conversion system, to change a DC input voitage into an ac output voltage；The direct current
Stream power conversion system is delivered to include：
One input capacitance group, comprising one first electric capacity and one second electric capacity, first electric capacity is with second capacitance connection in one
Property point, and receive the DC input voitage；
One first bridge-type switching circuit, in parallel input capacitance group, comprising one first bridge arm and in parallel with first bridge arm
One second bridge arm, first bridge arm is formed by one first power switch with one the 9th Diode series, and second bridge arm is by one
Two power switch are formed with 1 the tenth Diode series；
One first auxiliary switching circuit, includes one the 3rd bridge arm and the four bridge legs being connected with the 3rd bridge arm, the 3rd
Bridge arm is formed by one the 3rd power switch and 1 the 11st Diode series, and the four bridge legs are by one the 4th power switch and one
12 Diode series are formed, and the 3rd bridge arm connects the midpoint of first bridge arm, and the four bridge legs connect second bridge arm
Midpoint, the 3rd bridge arm is connected the neutral point with the tie point of the four bridge legs；
One second bridge-type switching circuit, in parallel input capacitance group, comprising one the 5th bridge arm and in parallel with the 5th bridge arm
One the 6th bridge arm, the 5th bridge arm is formed by one the 5th power switch and 1 the 13rd Diode series, and the 6th bridge arm is by one
6th power switch is formed with 1 the 14th Diode series；
One second auxiliary switching circuit, includes one the 7th bridge arm and one the 8th bridge arm being connected with the 7th bridge arm, the 7th
Bridge arm is formed by one the 7th power switch and 1 the 15th Diode series, and the 8th bridge arm is by one the 8th power switch and one
16 Diode series are formed, and the 7th bridge arm connects the midpoint of the 5th bridge arm, and the 8th bridge arm connects the 6th bridge arm
Midpoint, the 7th bridge arm is connected the neutral point with the tie point of the 8th bridge arm；
One first filter circuit, includes one first filter inductance, one second filter inductance and a filter capacitor, the filter capacitor
Between the output end for being connected to the output end of first filter inductance and second filter inductance, first filter inductance connection should
First bridge arm and the 3rd bridge arm, second filter inductance connect second bridge arm and the four bridge legs；
One second filter circuit, includes one the 3rd filter inductance, one the 4th filter inductance and the filter capacitor, the filter capacitor
It is connected between the output end of the 3rd filter inductance and the output end of the 4th filter inductance, the connection of the 3rd filter inductance should
5th bridge arm and the 7th bridge arm, the 4th filter inductance connect the 6th bridge arm and the 8th bridge arm；And
One controls circuit, produces a complementary switching signal pair and a complementary level signal pair, wherein the complementary switching signal is to dividing
First power switch and second power switch and the 5th power switch and the 6th power switch, the complementation are not controlled
Level signal to controlling the 3rd power switch and the 4th power switch and the 7th power switch and the 8th work(respectively
Rate is switched；
Wherein, first auxiliary switching circuit provide first filter inductance and second filter inductance release can path, this
Two auxiliary switching circuits provide the 3rd filter inductance and the 4th filter inductance release can path, to reduce direct current input electricity
Leakage current caused by the parasitic capacitance effect of pressure；
First electric capacity and second capacitance connection are in a neutral point, to maintain the cross-pressure of first electric capacity and the second electric capacity to distinguish
Equal to the half of the DC input voitage；
First power switch, one first diode in parallel with second power switch difference and one second diode；3rd work(
Rate switchs one threeth diode in parallel with the 4th power switch difference and one the 4th diode；5th power switch with this
Six power switch difference, one the 5th diode in parallel and one the 6th diode；7th power switch and the 8th power switch point
One the 7th diode and one the 8th diode not in parallel；And
When the ac output voltage is that positive half cycle is operated, the control circuit produces the complementary switching signal pair, with switching control
First power switch ends the 5th power switch and the 6th power switch with second power switch and low level, and
And the complementary level signal pair is produced, turn on the 3rd power switch with high level cuts with the 4th power switch and low level
Only the 7th power switch and the 8th power switch；Or when the ac output voltage is that negative half period is operated, control electricity
Road produces the complementary switching signal pair, is ended with the power switch of switching control the 5th and the 6th power switch and low level
First power switch and second power switch, and the complementary level signal pair is produced, the 7th work(is turned on high level
Rate is switched ends the 3rd power switch and the 4th power switch with the 8th power switch and low level.
7. direct current as claimed in claim 6 delivers stream power conversion system, wherein when the ac output voltage is grasped for positive half cycle
Make and when first filter inductance and second filter inductance are stored energy operation, the direct current delivers the stream energy storage of power conversion system one
Loop sequentially by the DC input voitage, first power switch, first filter inductance, the ac output voltage, this second
Filter inductance and second power switch are constituted.
8. direct current as claimed in claim 6 delivers stream power conversion system, wherein when the ac output voltage is grasped for positive half cycle
Make and first filter inductance and second filter inductance are that the direct current delivers stream power conversion system one and releases energy when releasing to operate
Loop is sequentially by first filter inductance, the ac output voltage, second filter inductance, the 4th power switch, the tenth
Two diodes, the 3rd power switch and the 11st diode are constituted.
9. direct current as claimed in claim 6 delivers stream power conversion system, wherein when the ac output voltage is grasped for negative half period
Make and when the 3rd filter inductance and the 4th filter inductance are stored energy operation, the direct current delivers the stream energy storage of power conversion system one
Loop is sequentially by the DC input voitage, the 5th power switch, the 3rd filter inductance, the ac output voltage, the 4th
Filter inductance and the 6th power switch are constituted.
10. direct current as claimed in claim 6 delivers stream power conversion system, wherein when the ac output voltage is grasped for negative half period
Make and the 3rd filter inductance and the 4th filter inductance are that the direct current delivers stream power conversion system one and releases energy when releasing to operate
Loop is sequentially by the 3rd filter inductance, the ac output voltage, the 4th filter inductance, the 8th power switch, the tenth
Six diodes, the 7th power switch and the 15th diode are constituted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310115740.5A CN104104249B (en) | 2013-04-03 | 2013-04-03 | Direct current delivers stream power conversion system and its operating method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310115740.5A CN104104249B (en) | 2013-04-03 | 2013-04-03 | Direct current delivers stream power conversion system and its operating method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104811070B (en) * | 2014-01-29 | 2017-08-04 | 台达电子工业股份有限公司 | Power conversion system and its operating method |
| CN105827126B (en) * | 2015-01-09 | 2018-10-09 | 台达电子工业股份有限公司 | Double down formula direct current delivers stream converting system and its operating method |
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| US5710698A (en) * | 1994-09-30 | 1998-01-20 | Lockheed Martin Energy Systems, Inc. | Delta connected resonant snubber circuit |
| CN102158110A (en) * | 2011-04-07 | 2011-08-17 | 江苏斯达工业科技有限公司 | Main circuit of non-isolated photovoltaic grid inverter and control realizing method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4564895A (en) * | 1983-09-12 | 1986-01-14 | Sundstrand Corporation | Neutrally clamped PWM half-bridge inverter |
| EP1087512A3 (en) * | 1999-09-02 | 2006-03-08 | ABB PATENT GmbH | ARCP multi-point power converter with intermediate circuit capacitors being voltage variable |
| JP3844050B2 (en) * | 2001-07-02 | 2006-11-08 | 株式会社安川電機 | Power converter |
| EP2889996B1 (en) * | 2012-08-21 | 2018-12-19 | Fuji Electric Co., Ltd. | Power conversion device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5710698A (en) * | 1994-09-30 | 1998-01-20 | Lockheed Martin Energy Systems, Inc. | Delta connected resonant snubber circuit |
| CN102158110A (en) * | 2011-04-07 | 2011-08-17 | 江苏斯达工业科技有限公司 | Main circuit of non-isolated photovoltaic grid inverter and control realizing method thereof |
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