The present invention relates to a single phase, non-insulated, miniaturized DC/AC power inverter (1) having an output power density higher than 3000 W/dm3, wherein said first (S1_H), second (S1_L), third (S2_H) and fourth (S2_L) switches are made of wide-band semiconductors and preferably of galliu
The present invention relates to a single phase, non-insulated, miniaturized DC/AC power inverter (1) having an output power density higher than 3000 W/dm3, wherein said first (S1_H), second (S1_L), third (S2_H) and fourth (S2_L) switches are made of wide-band semiconductors and preferably of gallium nitride or GaN semiconductors; and wherein said DC/AC power inverter (1) further comprises: a ripple-compensating active filter comprising a third half-bridge (203) having a fifth switch (S3_H) in series with a sixth switch (S3_L), said fifth switch (S3_H) being connected at one end to the positive terminal (L+) of the DC input, said sixth switch (S3_L) being connected at one end to the negative terminal (L−) of the DC input,the other end of the fifth switch (S3_H) being connected to the other end of the sixth switch (S3_L), defining a third common end, said third common end being connected to a first end of a LC filter, made of at least one inductor (L6) and one storage capacitor (C5), a second end of the LC filter being connected to the negative terminal (L−); modulation control means of said first (S1_H), second (S1_L), third (S2_H), fourth (S2_L), fifth (S3_H) and sixth (S3_L) switches for providing a switch frequency comprised between 20 and 500 kHz and allowing variable phase shifts between any two of said first (201), second (202) and third (203) half-bridges and allowing dead time modulation of the switches of said half-bridges (201, 202, 203), so that to obtain a switching approaching ZVS switching, in particular to obtain switching when current crosses through zero and further to cancel switching losses and so that to allow high peak-to-peak voltage variations in the active filter, while storing corresponding energy in the storage capacitors (C5), wherein the Y-capacitors of the common mode noise filter (100), are referenced to a shielding being at a reference potential, said shielding being insulated from earth, said Y-capacitors having a value comprised between 100 nF and several μF.
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1. A single phase, non-insulated, miniaturized DC/AC power inverter (1) having an output power density higher than 3000 W/dm3, comprising: a DC input having a positive terminal (L+) and a negative terminal (L−);an AC output having a line terminal (L) and a neutral terminal (N);at least a H full brid
1. A single phase, non-insulated, miniaturized DC/AC power inverter (1) having an output power density higher than 3000 W/dm3, comprising: a DC input having a positive terminal (L+) and a negative terminal (L−);an AC output having a line terminal (L) and a neutral terminal (N);at least a H full bridge switch topology made of a first half-bridge (201) having a first switch (S1_H) in series with a second switch (S1_L), and of a second half-bridge (202) having a third switch (S2_H) in series with a fourth switch (S2_L), said first switch (S1_H) being connected at one end to the positive terminal (L+) of the DC input, said second switch (S1_L) being connected at one end to the negative terminal (L−) of the DC input, the other end of the first switch (S1_H) being connected to the other end of the second switch (S1_L), defining a first common end, said first common end being connected to the line terminal (L) of the AC output, said third switch (S2_H) being connected at one end to the positive terminal (L+) of the DC input, said fourth switch (S2_L) being connected at one end to the negative terminal (L−) of the DC input, the other end of the third switch (S2_H) being connected to the other end of the fourth switch (S2_L), defining a second common end, said second common end being connected to the neutral terminal (N) of the AC output,at least one common mode noise EMI filter (100) connected between the first and the second common ends of the half-bridges and the terminals of the AC output,at least one differential mode noise EMI filter (101) connected between the first and the second common ends of the half-bridges and the terminals of the AC output;said common mode noise filter (100) having at least two “Y”-capacitors and two coupled inductors and said differential mode noise filter (101) having at least one “X”-capacitor;wherein said first (S1_H), second (S1_L), third (S2_H) and fourth (S2_L) switches are made of wide-band semiconductors and preferably of gallium nitride or GaN semiconductors;wherein said DC/AC power inverter (1) further comprises:a ripple-compensating active filter comprising a third half-bridge (203) having a fifth switch (S3_H) in series with a sixth switch (S3_L), said fifth switch (S3_H) being connected at one end to the positive terminal (L+) of the DC input, said sixth switch (S3_L) being connected at one end to the negative terminal (L−) of the DC input, the other end of the fifth switch (S3_H) being connected to the other end of the sixth switch (S3_L), defining a third common end, said third common end being connected to a first end of a LC filter, made of at least one inductor (L6) and one storage capacitor (C5), a second end of the LC filter being connected to the negative terminal (L−);modulation control means of said first (S1_H), second (S1_L), third (S2_H), fourth (S2_L), fifth (S3_H) and sixth (S3_L) switches for providing a switch frequency comprised between 20 and 500 kHz and allowing variable phase shifts between any two of said first (201), second (202) and third (203) half-bridges and allowing dead time modulation of the switches of said half-bridges (201, 202, 203),so that to obtain a switching approaching ZVS switching, in particular to obtain switching when current crosses through zero and further to cancel switching losses and so that to allow high peak-to-peak voltage variations in the active filter, while storing corresponding energy in the storage capacitors (C5),wherein the Y-capacitors of said common mode noise filter (100) are referenced to a shielding being at a reference potential, said shielding being insulated from earth, said Y-capacitors having a value comprised between 100 nF and several μF. 2. The DC/AC power inverter (1) of claim 1, wherein the coupled inductors of the common mode noise filter (100) have an external volume of about 5000 mm3, in the case of a 2 kW inverter, compatible with a reduced magnetic flux variation in said coupled inductors, obtained thanks to a dynamic change of the PWM phase between the two legs of the full bridge. 3. The DC/AC power inverter (1) of claim 1, wherein it comprises an input tank capacitor (C1) less than 15 μF, the active filter capacitor (C5) being less than 150 μF. 4. The DC/AC power inverter (1) of claim 1, wherein it comprises sensorless state observers for estimating the currents in the inverter, except the output current. 5. The DC/AC power inverter (1) of claim 1, wherein it comprises, for each switch, a circuit having a capacitive divider (301) for detecting the switch current zero crossover through the gate connection of the respective switches, so as to adjust a switch dead-time which is sufficiently long to prevent a risk of cross conduction between the switches of a half-bridge, while minimizing power losses due to reverse currents. 6. The DC/AC power inverter (1) of claim 5, wherein the circuit further comprises a common mode noise filter (302) relative to earth for protecting the drivers (303) of the switches, the inductors L31, L32 of the common mode filter (302) and the capacitors of the capacitive divider (301) being part of a RLC filter R′-L31-L32-C33-C34 acting as a low-pass filter whose components are selected so as to reduce the dv/dt on each switch to a value less than 50 V/ns and preferably less than 25 V/ns. 7. The DC/AC power inverter (1) of claim 1, wherein it comprises an open loop Hall sensor combined with an electromagnetic shield for measuring the inverter output current. 8. The DC/AC power inverter (1) of claim 1, wherein the capacitors are multilayer ceramic capacitors. 9. The DC/AC power inverter (1) of claim 1, wherein an auxiliary power supply is provided under the form of a soft switching LLC resonant circuit. 10. The DC/AC power inverter (1) of claim 1, wherein it comprises control means for maintaining DC input voltage essentially constant, while allowing ripple variation across the active filter. 11. The DC/AC power inverter (1) of claim 10, wherein the control means comprise a learning algorithm for reducing the DC input ripple through correction of modeling errors due to the presence of switch dead times. 12. The DC/AC power inverter (1) of claim 1, wherein the first half-bridge (201) and the second half-bridge (202) are each split by an additional half-bridge mounted thereon in parallel.
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