CN202889183U - Circuit for restraining non-insulation type inverter common mode leakage current - Google Patents
Circuit for restraining non-insulation type inverter common mode leakage current Download PDFInfo
- Publication number
- CN202889183U CN202889183U CN 201220504318 CN201220504318U CN202889183U CN 202889183 U CN202889183 U CN 202889183U CN 201220504318 CN201220504318 CN 201220504318 CN 201220504318 U CN201220504318 U CN 201220504318U CN 202889183 U CN202889183 U CN 202889183U
- Authority
- CN
- China
- Prior art keywords
- inductance
- switching device
- diode
- source
- connects
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Abstract
The utility model relates to a circuit for restraining the non-insulation type inverter common mode leakage current. The circuit comprises a direct current source, five switch components and four diodes, wherein the direct current is in parallel connection with a filter capacitor C1. An inductor L1 is in serial connection between the anode of a diode D2 and the positive electrode of the direct current source. A capacitor C2 is in serial connection between a diode D1 and the negative electrode of the direct current source. Due to the adoption of the circuit for restraining the non-insulation type inverter common mode leakage current, the common mode current has little effect on the grid-tied current, and the total harmonic distortion (THD) of the grid-tied current remains below 3%.
Description
Technical field
The utility model relates to a kind of inhibition non-isolation type inverter common mode leakage current circuit.
Background technology
The photovoltaic DC-to-AC converter of non-isolation is because the advantage that its efficient is high, lightweight, volume is little, be highly suitable for small-power house type inverter system, but owing to omitted isolated component, larger Ground leakage current may appear in the system, not only the normal operation of system caused adverse effect, more likely human body is formed injury, so how to solve focus and difficult point that the serious problem of leakage current is non-isolated inverter research.
Leakage current generating is owing to distributed capacitance larger between the photovoltaic cell of slab construction and shell causes, the size of distributed capacitance is relevant with the production technology of photovoltaic cell, power grade, size and external environment condition, especially after the rain in the moist situation, this moment, photovoltaic system worked, and the conduction moisture film of cell panel surface attachment will further increase capacitance.Generally speaking, the parasitic capacitance of crystal silicon photovoltaic cell is between 50-150nF/kWp, and film photovoltaic cell then can reach 1uF/kWp, and certainly, film photovoltaic cell in use General Requirements minus earth uses.
The conventional full bridge inverter circuit only just can make the common mode leakage current meet the demands when the applying double pole modulation, uses unipolarity or unipolarity multiple-frequency modulation mode all can produce serious common mode leakage problem, can't work.But no matter applying double pole modulation in circuit is in loss characteristic, or all can not show a candle to the unipolarity modulation system on the current harmonics characteristic.
The utility model content
The purpose of this utility model provides a kind of inhibition non-isolation type inverter common mode leakage current circuit and method, overcomes to use unipolarity or unipolarity multiple-frequency modulation mode all can produce serious common mode leakage problem, the deficiency that can't work in the existing product.
The purpose of this utility model is to be achieved through the following technical solutions:
A kind of inhibition non-isolation type inverter common mode leakage current circuit, comprise DC source, 5 switching devices and 4 diodes, wherein, the DC source filter capacitor C1 that is connected in parallel, be in series with inductance L 1 between the anode of diode D2 and the positive pole of DC source, be connected in series capacitor C 2 between diode D1 and the DC source negative pole; The positive pole of the anodic bonding DC source of diode D1, the drain electrode of the negative electrode connecting valve device S3 of diode D1, the negative electrode of diode D2 connects the negative electrode of diode D1, the drain electrode of the anodic bonding switching device S5 of diode D2, and the source electrode of switching device S5 connects the negative pole of DC source; The drain electrode of switching device S1 connects the negative electrode of diode D1, and the drain electrode of the source electrode of switching device S1 and switching device S2 is connected in node a, and the source electrode of switching device S2 connects the negative pole of DC source; The drain electrode of switching device S3 connects the negative electrode of diode D1, the drain electrode connected node b of the source electrode of switching device S3 and switching device S4, and the source electrode of switching device S4 connects the negative pole of DC source; Node a connects inductance L
Dma, inductance L
DmaBe connected in series inductance L
Cma, inductance L
CmaConnection is incorporated into the power networks, and node b connects inductance L
Dmb, inductance L
DmbBe connected in series inductance L
Cmb, inductance L
CmbConnection is incorporated into the power networks, inductance L
DmaAnd inductance L
DmbBe differential mode inductance M
Dm, inductance L
CmaAnd inductance L
CmbBe common mode inductance M
Cm
Further, described switching device S1 is comprised of transistor and diode D3 inverse parallel, switching device S3 is comprised of transistor and diode D4 inverse parallel, the transistorized collector electrode of switching device S1 connects the negative electrode of diode D3, the transistorized emitter of switching device S1 connects the anode of diode D3, the transistorized collector electrode of switching device S3 connects the negative electrode of diode D4, and the transistorized emitter of switching device S3 connects the anode of diode D4.
Further, the negative pole contact resistance R of described DC source
Ab, resistance R
AbConnect respectively capacitor C
aAnd capacitor C
b, capacitor C
aWith capacitor C
bParallel connection, capacitor C
aConnect inductance L
Cma, capacitor C
bConnect inductance L
Cmb
A kind of inhibition non-isolation type inverter common mode leakage current method may further comprise the steps:
1) inductance L 1 consists of booster circuit with switching device S5, the voltage transformation of DC source input to the target DC bus-bar voltage, for the inversion of back provides stable voltage;
2) if the voltage of DC source greater than the target busbar voltage, is then turned off booster circuit;
3) switching device S1, switching device S2, switching device S3 and switching device S4 consist of full-bridge inverting, and full-bridge inverting is modulated by unipolarity;
4) inversion output is first through a differential mode inductance M
Dm, differential mode inductance M
DmOutput connect a common mode inductance M
Cm, this common mode inductance M
CmWith capacitor C
a, capacitor C
bAnd resistance R
AbCombination.
The beneficial effects of the utility model are: a kind of inhibition non-isolation type inverter common mode leakage current circuit and method that the utility model provides, common mode current is less on the impact of grid-connected current, the THD(total harmonic distortion of grid-connected current) keep below 3%.
Description of drawings
The below is described in further detail the utility model with reference to the accompanying drawings.
Fig. 1 is common mode circuit theory figure;
Fig. 2 is common mode resonance circuit reduction model;
Fig. 3 is the first-harmonic analysis of the lower common-mode voltage of unipolarity modulation;
Fig. 4 is the high-frequency harmonic analysis of the lower common-mode voltage of unipolarity modulation;
Fig. 5 is that common mode current suppresses circuit diagram;
Fig. 6 is common mode loop equivalent model figure;
Fig. 7 is the described a kind of circuit diagram that suppresses non-isolation type inverter common mode leakage current circuit of the utility model embodiment.
Embodiment
Be illustrated in figure 1 as the common-mode circuit schematic diagram, wherein, C
PvgBe the stray capacitance between photovoltaic cell component and the ground contacts, relevant with cell panel mounting means, weather conditions, because it much larger than other stray elements, plays a major role to leakage current; C
Ag, C
BgBe the electric capacity between brachium pontis mid point and the earth point, main manifestations is the mounting means between module and the radiator; R
a, R
bBe the equivalent series resistance of filter inductance, in several milliohms between tens milliohms; R
CgThe impedance that is connected between system earth point and actual the earth is generally 1 Ω ~ 10 Ω.
Resonance model can further be simplified as shown in Figure 2, and wherein, R is the comprehensive of all line impedances and impedance ground, and Cp is over the ground distributed capacitance of cell panel.At first the common mode power supply in the model is analyzed, under the unipolarity modulation system, common-mode voltage is carried out the FFT(fast Fourier transform) analyze, as shown in Figure 3, because the positive-negative half-cycle of common-mode voltage is symmetrical, so first-harmonic is 100Hz, and contains very large flip-flop; As shown in Figure 4, oscillometry shows, the common-mode voltage main component concentrate on switching frequency time integral multiple and near, the composition under other frequencies is very little.
Resonance model is carried out frequency-domain analysis, and the transfer function of circuit and resonance frequency are suc as formula shown in (1), (2):
When parameter changes, the factor that affects the common mode leakage current mainly contains direct voltage, switching frequency, distributed capacitance, filter inductance, loop resistance, wherein direct voltage generally concentrates between 350V ~ 400V, and excursion is little, and the size of common mode current is not played a decisive role.And for other several aspects following situation is arranged:
When 1) frequency of common-mode voltage was more near the resonance point of circuit, the common mode current that excites was larger, and this moment, the impedance in common mode loop showed as loop resistance;
2) distributed capacitance and filter inductance determine the resonance frequency of circuit jointly, and resonance frequency reduces with the increase of the two, and wherein distributed capacitance determines the circuit gain of low-frequency range, and distributed capacitance is less, and low-frequency range is stronger to the inhibition ability of common mode current; Filter inductance determines the circuit gain of high band, and filter inductance is larger, and high band is stronger to the inhibition ability of common mode current;
3) switching frequency determines the spectrum distribution of common-mode voltage, the integral multiple of switching frequency and near have larger common-mode voltage component, the most serious situation of common mode current is just in time to overlap with switching frequency integral multiple point when the circuit resonance frequency;
4) loop resistance has obvious inhibitory action to resonance current, loop resistance is larger, the common mode current that resonance point excites is less, but be subjected to grid-connected system to the requirement of line impedance and earth resistance, consider for reducing loss and safety ground, loop resistance is generally less, and photovoltaic parallel in system standard code photovoltaic array earth resistance is not more than 10 Ω.
Therefore, make the common mode leakage current in the circuit as far as possible little, need to allow the resonance point frequency of circuit as far as possible inferior away from the switching frequency integral multiple, and strengthen the inhibition ability of common mode current.Wherein, switching frequency is generally selected according to the loop of power circuit characteristic of circuit, and concentrates near several kHz, is 16kHz such as system.Simultaneously, the over the ground parasitic capacitance of circuit is unfixing, distribution of capacitance values is at 10nF/kWp ~ 150nF/kWp, if do not controlled, the resonance frequency of system generally concentrates on 10kHz between the 100kHz, and this frequency range is comprising low 10 multiples of switching frequency, it also is the maximum frequency band of common-mode voltage distribution, along with the over the ground variation of parasitic capacitance, the resonance frequency of system always doubly time overlaps with the low order of switching frequency, will excite very large common mode current at this moment.If set simulation parameter be: L=1.5mH, Cp=64nF, fr=16.24kHz, at this moment, the Ground leakage current peak value will reach 10A, and major part concentrates on the resonant frequency point place.
In order to limit the excursion of resonance frequency; we only in the common mode loop initiatively adding electric capacity make it distributed capacitance be in parallel over the ground with cell panel; and the former appearance value will be much larger than the latter; to reduce distributed capacitance to the impact of resonance frequency; obviously this scheme is feasible, and at this moment, the electric current in the common mode loop will major part be transferred on the large electric capacity that adds; need in parallel branch, add current-limiting resistance, to suppress the electric current of resonance peak.Simultaneously, for increasing the inhibition ability of common mode loop high frequency section, it is far from being enough depending merely on the differential mode filter inductance that is incorporated into the power networks, and adding common mode inductance in the side that is incorporated into the power networks can address this problem.
As shown in Figure 5, filtering differential mode inductance volume generally needs larger owing to be incorporated into the power networks, and according to the front theory analysis, need to be symmetrical arranged the inductance of two brachium pontis outlet sides, in order to save volume and weight, the inductor design of two brachium pontis output lines for being around in altogether the differential mode inductance of a magnetic core, is supposed that two coils of differential mode inductance are coupled fully, i.e. L
Dma=L
Dmb=M
Dm, then differential mode inductance will not play inhibitory action to common mode current this moment, so do not appear in the equivalent model of common mode loop, its value is according to the Ripple Design of grid-connected current.
In order to increase high band to the inhibition ability of common mode current, add common mode inductance in the side that is incorporated into the power networks, suppose that equally two coils are coupled fully, i.e. L
Cma=L
Cmb=M
Cm=L will show as the inductance L that the sense value is L in the equivalent model of common mode loop
CmOn the side L that is incorporated into the power networks, N line, respectively the direct current negative pole is accessed capacitor C
L, C
NAnd current-limiting resistance R
Cm, this moment common mode loop equivalent model as shown in Figure 6, wherein, C
Cm=C
L+ C
NStill ignore the electrical network common frequency power network in the model to the impact of common mode current.Notice that the general resistance of current-limiting resistance in the circuit is less, between 1 Ω ~ 10 Ω, so the impact that the resonance frequency analysis in common mode loop can negligible resistance.
Equivalent model shown in Figure 6 is analyzed, wherein C
PvgRelevant with panel array capacity and climatic environment, take the 5kW power system capacity as example, capacitance values is roughly between 50nF ~ 500nF, make distributed capacitance not produce larger impact to resonant frequency point, electric capacity in parallel should be at least greater than 10uF, simultaneously, the electric capacity here can not be excessive, otherwise will affect the inhibition ability of low-frequency range, and make the common mode current of low-frequency range excessive, so design C in the native system
L=C
N=6.3 uF, i.e. C
Cm=12.6uF.
The interchange main component of common-mode voltage is 100Hz first-harmonic and the inferior harmonic wave of switching frequency (16kHz) integral multiple, desirable resonance point frequency should be more low better, the competence exertion inductance is to the inhibition ability of high-frequency harmonic like this, but be subjected to the actual inductance design for the restriction of magnetic core saturation flux, volume etc., it is too large that inductance can not design, so make resonance frequency comparatively reasonable between 100Hz to 1kHz in the actual design, design L
Cma=L
Cmb=M
Cm=4mH does not consider the distributed capacitance branch road to the impact of resonance frequency, at this moment the resonance point frequency:
Because added current-limiting resistance and the cause of distributed capacitance in parallel, above computing formula is in fact accurately strict, can only roughly reflect the scope at resonance point frequency place.
Based on above parameter designing common mode loop row are write equation of transfer and carry out frequency-domain analysis, ignore less R
Cg,
The target of circuit design is to make icm and icm2 all as far as possible little, namely keeps the damping capacity to the common-mode voltage maximum, works as C
PvgWhen changing between 50nF ~ 500nF, the variation of distributed capacitance exerts an influence hardly to total common mode current i cm2, not obviously skew of resonance point frequency when changing between 50nF ~ 500nF; The variation of distributed capacitance exerts an influence to the common mode current icm of earth-return, and low frequency section harmonic inhibition capability has certain weakening, will increase earth-current when distributed capacitance increases.
Be current waveform and the FFT of 50nF and 500nF capacitance for electric capacity respectively, the worst situation of corresponding operation when distributed capacitance reaches maximum 500nF, this moment, the common mode current peak value was 100mA over the ground, effective value satisfies standard-required less than 30mA.Under normal 50nF service conditions, the common mode current peak value only is 10mA, substantially can ignore.The current peak of common mode absorption circuit can reach 2A, harmonic content concentrates on 100Hz equally, 700Hz, 16kHz three places, and the electric current content at resonance frequency place is larger, this mainly is subjected to the impact of common mode current-limiting resistance, if increase the resistance of current-limiting resistance, then the current peak of absorption circuit can reduce, but the common mode current to earth-return correspondingly increases, so the choosing value of resistance needs the electric current of two branch roads of balance, should make the common mode current of absorption circuit as far as possible little, to reduce in ohmically power loss, also to consider the impact on the earth-return common mode current simultaneously.
The topological structure of the inverter of building in this way is as shown in Figure 7:
The described a kind of inhibition non-isolation type inverter common mode leakage current circuit of the utility model embodiment, comprise DC source, 5 switching devices and 4 diodes, wherein: the DC source filter capacitor C1 that is connected in parallel, be in series with inductance L 1 between the anode of diode D2 and the positive pole of DC source, be connected in series capacitor C 2 between diode D1 and the DC source negative pole; The positive pole of the anodic bonding DC source of diode D1, the drain electrode of the negative electrode connecting valve device S3 of diode D1, the negative electrode of diode D2 connects the negative electrode of diode D1, the drain electrode of the anodic bonding switching device S5 of diode D2, and the source electrode of switching device S5 connects the negative pole of DC source; The drain electrode of switching device S1 connects the negative electrode of diode D1, and the drain electrode of the source electrode of switching device S1 and switching device S2 is connected in node a, and the source electrode of switching device S2 connects the negative pole of DC source; The drain electrode of switching device S3 connects the negative electrode of diode D1, the drain electrode connected node b of the source electrode of switching device S3 and switching device S4, and the source electrode of switching device S4 connects the negative pole of DC source; Node a connects inductance L
Dma, inductance L
DmaBe connected in series inductance L
Cma, inductance L
CmaConnection is incorporated into the power networks, and node b connects inductance L
Dmb, inductance L
DmbBe connected in series inductance L
Cmb, inductance L
CmbConnection is incorporated into the power networks, inductance L
DmaWith inductance L
DmbBe differential mode inductance M
Dm, inductance L
CmaWith inductance L
CmbBe common mode inductance M
Cm
Described switching device S1 is comprised of transistor and diode D3 inverse parallel, switching device S3 is comprised of transistor and diode D4 inverse parallel, the transistorized collector electrode of switching device S1 connects the negative electrode of diode D3, the transistorized emitter of switching device S1 connects the anode of diode D3, the transistorized collector electrode of switching device S3 connects the negative electrode of diode D4, and the transistorized emitter of switching device S3 connects the anode of diode D4.
The negative pole contact resistance R of described DC source
Ab, resistance R
AbConnect respectively the 3rd capacitor C
aWith the 4th capacitor C
b, the 3rd capacitor C
aWith the 4th capacitor C
bParallel connection, the 3rd capacitor C
aConnect the 3rd inductance L
Cma, the 4th capacitor C
bConnect the 5th inductance L
Cmb
The described inhibition non-isolation type of the utility model embodiment inverter common mode leakage current method may further comprise the steps:
1) inductance L 1 consists of booster circuit with switching device S5, the voltage transformation of DC source input to the target DC bus-bar voltage, for the inversion of back provides stable voltage;
2) if the voltage of DC source greater than the target busbar voltage, is then turned off booster circuit, then electric current flows through from diode D1, has reduced the loss of booster circuit, thereby has improved the conversion efficiency of system;
3) switching device S1, switching device S2, switching device S3 and switching device S4 consist of full-bridge inverting, and full-bridge inverting is modulated by unipolarity, can improve the conversion efficiency of system, can reduce the harmonic wave of grid-connected current simultaneously;
4) inversion output is first through a differential mode inductance M
Dm, differential mode inductance can be considered into perfect sine wave to the square wave of full-bridge output, adopts differential mode inductance to replace two independent inductance to reduce the sense value of inductance, has improved simultaneously efficient; Differential mode inductance M
DmOutput connect a common mode inductance M
Cm, this common mode inductance M
CmWith capacitor C
a, capacitor C
bAnd resistance R
AbCombination can well suppress owing to the common mode leakage current that adopts the unipolarity modulator approach to bring.
DC source capacitor C 1 in parallel plays filter action to the power supply of inputting.Capacitor C 2 appearance values are larger, and the energy required owing to inversion is larger, and larger appearance value can reduce the mains ripple of bus.
The utility model is not limited to above-mentioned preferred forms; anyone can draw other various forms of products under enlightenment of the present utility model; no matter but do any variation in its shape or structure; every have identical with a application or akin technical scheme, all drops within the protection range of the present utility model.
Claims (3)
1. one kind is suppressed non-isolation type inverter common mode leakage current circuit, it comprises DC source, 5 switching devices and 4 diodes, it is characterized in that: the described DC source filter capacitor C1 that is connected in parallel, be in series with inductance L 1 between the anode of diode D2 and the positive pole of DC source, be connected in series capacitor C 2 between diode D1 and the DC source negative pole; The positive pole of the anodic bonding DC source of diode D1, the drain electrode of the negative electrode connecting valve device S3 of diode D1, the negative electrode of diode D2 connects the negative electrode of diode D1, the drain electrode of the anodic bonding switching device S5 of diode D2, and the source electrode of switching device S5 connects the negative pole of DC source; The drain electrode of switching device S1 connects the negative electrode of diode D1, and the drain electrode of the source electrode of switching device S1 and switching device S2 is connected in node a, and the source electrode of switching device S2 connects the negative pole of DC source; The drain electrode of switching device S3 connects the negative electrode of diode D1, the drain electrode connected node b of the source electrode of switching device S3 and switching device S4, and the source electrode of switching device S4 connects the negative pole of DC source; Node a connects inductance L
Dma, inductance L
DmaBe connected in series inductance L
Cma, inductance L
CmaConnection is incorporated into the power networks; Node b connects inductance L
Dmb, inductance L
DmbBe connected in series inductance L
Cmb, inductance L
CmbConnection is incorporated into the power networks, inductance L
DmaAnd inductance L
DmbBe differential mode inductance M
Dm, inductance L
CmaAnd inductance L
CmbBe common mode inductance M
Cm
2. inhibition non-isolation type inverter common mode leakage current circuit according to claim 1, it is characterized in that: described switching device S1 is comprised of transistor and diode D3 inverse parallel, switching device S3 is comprised of transistor and diode D4 inverse parallel, the transistorized collector electrode of switching device S1 connects the negative electrode of diode D3, the transistorized emitter of switching device S1 connects the anode of diode D3, the transistorized collector electrode of switching device S3 connects the negative electrode of diode D4, and the transistorized emitter of switching device S3 connects the anode of diode D4.
3. inhibition non-isolation type inverter common mode leakage current circuit according to claim 1 is characterized in that: the negative pole contact resistance R of described DC source
Ab, resistance R
AbConnect respectively capacitor C
aAnd capacitor C
b, capacitor C
aWith capacitor C
bParallel connection, capacitor C
aConnect inductance L
Cma, capacitor C
bConnect inductance L
Cmb
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220504318 CN202889183U (en) | 2012-09-28 | 2012-09-28 | Circuit for restraining non-insulation type inverter common mode leakage current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220504318 CN202889183U (en) | 2012-09-28 | 2012-09-28 | Circuit for restraining non-insulation type inverter common mode leakage current |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202889183U true CN202889183U (en) | 2013-04-17 |
Family
ID=48080570
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220504318 Expired - Lifetime CN202889183U (en) | 2012-09-28 | 2012-09-28 | Circuit for restraining non-insulation type inverter common mode leakage current |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202889183U (en) |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102857084A (en) * | 2012-09-28 | 2013-01-02 | 北京京仪绿能电力系统工程有限公司 | Circuit and method for restraining non-insulation type inverter common mode leakage current |
| WO2017063605A1 (en) * | 2015-10-16 | 2017-04-20 | 得能创科有限公司 | Self-coupled power source ripple suppression circuit and method |
| CN108233756A (en) * | 2018-03-19 | 2018-06-29 | 盐城工学院 | A kind of double ground connection half-bridge inverters of single input and its control method |
| CN108365769A (en) * | 2018-03-19 | 2018-08-03 | 盐城工学院 | A kind of single input is double to be grounded asymmetrical half-bridge inverter and its control method |
| CN108365770A (en) * | 2018-03-19 | 2018-08-03 | 盐城工学院 | A kind of single input half-bridge inverter and its control method |
| CN108418452A (en) * | 2018-03-20 | 2018-08-17 | 盐城工学院 | A kind of leakage current photovoltaic combining inverter and its control method |
| CN108418453A (en) * | 2018-03-20 | 2018-08-17 | 盐城工学院 | A kind of photovoltaic combining inverter and its control method |
| CN108736699A (en) * | 2018-07-12 | 2018-11-02 | 广东寰宇电子科技股份有限公司 | A kind of circuit inhibiting photovoltaic inverter leakage current |
| CN109116123A (en) * | 2018-07-26 | 2019-01-01 | 国网山东省电力公司莱芜供电公司 | A kind of transformer grounding resistance measuring system and method using photovoltaic DC-to-AC converter |
| CN109768725A (en) * | 2019-03-06 | 2019-05-17 | 武汉大学 | A kind of single-phase non-isolated photovoltaic grid-connected inverter topological structure |
| CN110875688A (en) * | 2018-08-31 | 2020-03-10 | 群光电能科技股份有限公司 | Voltage converter for reducing common mode noise and method thereof |
| US11171557B2 (en) | 2018-09-20 | 2021-11-09 | Abb Schweiz Ag | Power converter |
| CN108736699B (en) * | 2018-07-12 | 2024-04-26 | 广东寰宇电子科技股份有限公司 | Circuit for inhibiting leakage current of photovoltaic inverter |
-
2012
- 2012-09-28 CN CN 201220504318 patent/CN202889183U/en not_active Expired - Lifetime
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102857084A (en) * | 2012-09-28 | 2013-01-02 | 北京京仪绿能电力系统工程有限公司 | Circuit and method for restraining non-insulation type inverter common mode leakage current |
| WO2017063605A1 (en) * | 2015-10-16 | 2017-04-20 | 得能创科有限公司 | Self-coupled power source ripple suppression circuit and method |
| CN108233756B (en) * | 2018-03-19 | 2019-10-22 | 盐城工学院 | A kind of single input is double to be grounded half-bridge inverter and its control method |
| CN108233756A (en) * | 2018-03-19 | 2018-06-29 | 盐城工学院 | A kind of double ground connection half-bridge inverters of single input and its control method |
| CN108365769A (en) * | 2018-03-19 | 2018-08-03 | 盐城工学院 | A kind of single input is double to be grounded asymmetrical half-bridge inverter and its control method |
| CN108365770A (en) * | 2018-03-19 | 2018-08-03 | 盐城工学院 | A kind of single input half-bridge inverter and its control method |
| CN108418452A (en) * | 2018-03-20 | 2018-08-17 | 盐城工学院 | A kind of leakage current photovoltaic combining inverter and its control method |
| CN108418453A (en) * | 2018-03-20 | 2018-08-17 | 盐城工学院 | A kind of photovoltaic combining inverter and its control method |
| CN108736699A (en) * | 2018-07-12 | 2018-11-02 | 广东寰宇电子科技股份有限公司 | A kind of circuit inhibiting photovoltaic inverter leakage current |
| CN108736699B (en) * | 2018-07-12 | 2024-04-26 | 广东寰宇电子科技股份有限公司 | Circuit for inhibiting leakage current of photovoltaic inverter |
| CN109116123A (en) * | 2018-07-26 | 2019-01-01 | 国网山东省电力公司莱芜供电公司 | A kind of transformer grounding resistance measuring system and method using photovoltaic DC-to-AC converter |
| CN110875688A (en) * | 2018-08-31 | 2020-03-10 | 群光电能科技股份有限公司 | Voltage converter for reducing common mode noise and method thereof |
| CN110875688B (en) * | 2018-08-31 | 2020-11-17 | 群光电能科技股份有限公司 | Voltage converter for reducing common mode noise and method thereof |
| US11171557B2 (en) | 2018-09-20 | 2021-11-09 | Abb Schweiz Ag | Power converter |
| CN109768725B (en) * | 2019-03-06 | 2020-08-07 | 武汉大学 | Single-phase non-isolated photovoltaic grid-connected inverter topological structure |
| CN109768725A (en) * | 2019-03-06 | 2019-05-17 | 武汉大学 | A kind of single-phase non-isolated photovoltaic grid-connected inverter topological structure |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202889183U (en) | Circuit for restraining non-insulation type inverter common mode leakage current | |
| CN102857084A (en) | Circuit and method for restraining non-insulation type inverter common mode leakage current | |
| CN205647288U (en) | Non - isolated form photovoltaic grid -connected inverter | |
| CN102594106A (en) | Method for restraining voltage background harmonic wave of grid-connected inverter | |
| CN201878036U (en) | Inverter-type welding and cutting power supply with PFC function | |
| CN107070275A (en) | The low common mode leakage current single-phase photovoltaic grid-connected inverter of five level and photovoltaic parallel in system | |
| CN104811071A (en) | Photovoltaic inverter and passive decoupling restraining method based on non-isolated LCL filtering | |
| CN202495887U (en) | Inverter used in photovoltaic power generation | |
| CN103178734A (en) | Photovoltaic inverter | |
| CN202261073U (en) | Circuit structure of inverter | |
| CN102882228A (en) | Single-phase non-isolated photovoltaic grid-connected inverter | |
| WO2019037428A1 (en) | Double-layer optimization global synchronous pulse width modulation system and method | |
| CN204859029U (en) | Novel single -phase photovoltaic contravariant leakage current restraines topological structure | |
| CN207968046U (en) | A kind of maximum power point tracking system and photovoltaic charging system | |
| CN203416162U (en) | Photovoltaic inverter-used du/dt filter circuit | |
| CN206099812U (en) | Single -phase sinusoidal wave variable frequency power supply system | |
| CN202406052U (en) | Digital grid-connected solar inverter | |
| CN107659158B (en) | Isolated high-gain direct current converter of multi-resonant network unit | |
| CN103427435B (en) | A kind of three-phase non-isolated photovoltaic grid-connected inverter and a kind of photovoltaic generating system | |
| CN206628991U (en) | The low common mode leakage current single-phase photovoltaic grid-connected inverter of five level and photovoltaic parallel in system | |
| CN104539180A (en) | Single-phase transformer-free inverter capable of reducing system leak current | |
| CN106033939A (en) | LCL non-isolation type grid-connected inverter system | |
| CN204794129U (en) | High -power photovoltaic power generation tracks control system | |
| CN104410267A (en) | Switching power source | |
| Dai et al. | Research on common-mode leakage current for a novel non-isolated dual-buck photovoltaic grid-connected inverter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C53 | Correction of patent of invention or patent application | ||
| CB03 | Change of inventor or designer information |
Inventor after: Zhang Ying Inventor after: Ma Liang Inventor after: Sun Linlin Inventor before: Zhang Ying |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: INVENTOR; FROM: ZHANG YING TO: ZHANG YING MA LIANG SUN LINLIN |
|
| CX01 | Expiry of patent term |
Granted publication date: 20130417 |
|
| CX01 | Expiry of patent term |