WO2012163235A1 - 一种逆变器拓扑电路、逆变方法和一种逆变器 - Google Patents
一种逆变器拓扑电路、逆变方法和一种逆变器 Download PDFInfo
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- WO2012163235A1 WO2012163235A1 PCT/CN2012/075812 CN2012075812W WO2012163235A1 WO 2012163235 A1 WO2012163235 A1 WO 2012163235A1 CN 2012075812 W CN2012075812 W CN 2012075812W WO 2012163235 A1 WO2012163235 A1 WO 2012163235A1
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- source
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
Definitions
- the present invention relates to the field of communications, and in particular, to an inverter topology circuit, an inverter method, and an inverter. Background technique
- the inverter circuit is a circuit for converting direct current into alternating current, and is a circuit for converting direct current energy into alternating current energy; it includes an output alternating voltage form, such as an uninterruptible power supply; and includes providing an alternating current output following an external alternating current voltage.
- the form of current such as solar grid-connected inverters, wind-connected grid generators, etc.
- the inverter circuit requires high-frequency switching in the circuit to switch between high-frequency switching between the on and off states during operation, but in the prior art, when the switch performs high-frequency switching between on and off, Generate turn-on and turn-off losses. Therefore, the circuit consumes a large amount of power and is inefficient. Summary of the invention
- Embodiments of the present invention provide an inverter topology circuit capable of reducing turn-on and turn-off losses of a high frequency switch, reducing power consumption, and improving work efficiency.
- an inverter topology circuit including a DC source, an AC source, a first bridge arm, a first inductor, and a second inductor, wherein the first bridge arm is connected in parallel to the DC source poles, and the first One end of the inductor and the second inductor are respectively connected to a connection point between the two branches of the first bridge arm, and the other ends of the first inductor and the second inductor are respectively connected to the two ends of the AC source
- the method further includes: a fifth switch tube, a sixth switch tube, a fifth diode, a sixth diode, and a first capacitor;
- the fifth switch tube and the fifth diode are connected in parallel, and the sixth switch tube and the sixth diode are Union
- the same pole of the fifth diode and the sixth diode are connected together with one pole of the DC source, and the other pole of the fifth diode is connected to the second inductor and the AC source The other pole of the sixth diode is connected at a connection point between the first inductor and the alternating current source;
- the first capacitor is connected in parallel to the two poles of the alternating current source.
- an inverter method for an inverter circuit including:
- the fifth switch tube is kept open, and the third switch tube, the fourth switch tube, and the sixth switch tube are always turned off;
- the sixth switch tube In the second half of the cycle, the sixth switch tube is kept open, and the first switch tube, the second switch tube, and the sixth switch tube are always turned off;
- the fourth switching transistor When the current on the second inductor drops to zero or the current flowing through is a small negative value, the fourth switching transistor is turned off, and the third switching transistor is turned on at this time.
- an inversion method further comprising:
- the first switch tube, the second switch tube, the third switch tube, and the fifth switch tube are always turned off during a first period in which the output voltage and the output current are inverted; Opening the fourth switch tube and the sixth switch tube;
- the first switch tube, the third switch tube, the fourth switch tube, and the sixth switch tube are always turned off during a second period in which the output voltage and the output current are inverted;
- the fifth switch is turned on, and the turn-on time of the second switch is adjusted to obtain a required output current.
- an inversion method including:
- the working mode of this circuit can be continuous inductance
- the inductor current is controlled to be zero or a small negative value, and the seventh diode and the eighth diode function as a freewheeling current.
- an inversion method further comprising:
- the circuit When the output voltage is less than the DC source voltage, the circuit operates in the boost mode
- the first switch tube is kept open, the sixth switch tube is turned on, and the fifth switch tube is turned off, and an inductor current of the first inductor is increased;
- the sixth switch tube is turned off, the fifth switch tube is turned on, and the first inductor starts to flow.
- an inverter including: the inverter topology circuit;
- Control logic connected to each of the switch tubes in the inverter topology circuit, for controlling the DRAWINGS
- FIG. 1 is a circuit diagram of an inverter in the prior art
- FIG. 2 is a circuit diagram of a solar-connected non-isolated inverter in the prior art
- 3A is a schematic diagram 1 of an inverter topology circuit according to an embodiment of the present invention.
- FIG. 3B is a schematic diagram 2 of an inverter topology circuit according to an embodiment of the present invention.
- 3C is a schematic diagram 3 of an inverter topology circuit according to an embodiment of the present invention.
- 3D is a schematic diagram 4 of an inverter topology circuit according to an embodiment of the present invention.
- 4A is a schematic diagram 5 of an inverter topology circuit according to an embodiment of the present invention.
- 4B is a schematic diagram 6 of an inverter topology circuit according to an embodiment of the present invention.
- 4C is a schematic diagram 7 of an inverter topology circuit according to an embodiment of the present invention.
- 4D is a schematic diagram 8 of an inverter topology circuit according to an embodiment of the present invention.
- 4E is a schematic diagram of implementing an embodiment of the inverter topology circuit for implementing step-up and step-down conversion according to an embodiment of the present invention
- 4F is a schematic diagram IX of an inverter topology circuit according to an embodiment of the present invention.
- FIG. 4G is a schematic diagram of an inductor waveform flow of an inverter topology circuit according to an embodiment of the present invention
- FIG. 5A is a schematic diagram of reactive power compensation output voltage and output current of an inverter topology circuit according to an embodiment of the present invention
- 5B is an inverter topology circuit according to an embodiment of the present invention
- FIG. 10C is a schematic diagram of an inverter topology circuit according to an embodiment of the present invention.
- FIG. 5D is a schematic diagram of an inverter topology circuit according to the embodiment of the present invention.
- Figure 5E is the present invention; the embodiment provides ⁇ ] inverter topology circuit 7 : Figure 13;
- Figure 5F is the present invention; the embodiment provides a white 1 inverter topology circuit 7: Figure 14;
- FIG. 6A is a schematic diagram of an inverter topology circuit according to the embodiment of the present invention.
- FIG. 16 is a schematic diagram of an inverter topology circuit according to an embodiment of the present invention.
- FIG. 7A is a schematic diagram of an inverter topology circuit according to the embodiment of the present invention.
- FIG. 7B provides an inverter topology circuit according to an embodiment of the present invention
- the inverter circuit of the prior art includes a DC source DC, an AC source AC, a high frequency switch tube (Ql, Q2, Q3, Q4), a filter inductor L1, L2, and an auxiliary conduction diode (Dl). , D2, D3, D4).
- the voltage output from the inverter circuit that is, the voltage UAB between point A and point B is the DC source voltage UDC; when Q4 is turned off Due to the freewheeling action of the inductors L1, L2, the current loop flows out from L1, flows through the AC source, L2, Q3 (D3), Ql, L1, and the voltage UAB outputted by the inverter circuit is 0; The current is controlled to control the length of time that Q4 is turned on and off, so that the UAB voltage is equivalent in area to the sinusoidal half wave during the half cycle of Q1 turn-on.
- the UAB's high-frequency voltage pulse is filtered by L1 and L2, and is in phase with the sinusoidal positive half of the AC source to achieve voltage follow-up.
- the power output can be achieved by controlling the magnitude of the output current Io.
- Ql and Q3 respectively open half of the power frequency cycle, and the working condition in the half cycle of Q3 opening is the same as the above case, and will not be described again.
- Q4 is a hard switch.
- the analysis process of Q2 is similar to the above, and it is also a hard switch.
- the hard switch in this existing inverter circuit has high power consumption and low efficiency.
- the source, inverter circuit and battery board parasitic capacitance form an electrical loop.
- the ground leakage current flowing through the circuit is proportional to the voltage change rate of the panel to the earth.
- An embodiment of the present invention provides an inverter topology circuit, as shown in FIG. 3A, including a DC source DC, an AC source AC, a high frequency switch tube Ql, Q2, Q3, Q4, and a power frequency switch tube Q5, Q6, high.
- Q1 is connected in parallel with D1
- Q2 is connected in parallel with D2
- Q3 is connected in parallel with D3
- Q4 is connected in parallel with D4
- D1 and D2 are connected in series to form the first branch of the first bridge arm
- D3 and D4 are connected in series to form the first bridge.
- the second branch of the arm, both branches are connected in parallel at the two poles of the DC source, wherein the cathodes of D1 and D3 are connected to the anode of DC, and the anodes of D2 and D4 are connected to the cathode of DC.
- L1 is connected to the connection point between D1 and D2, and the other end is connected to one pole of AC; one end of L2 is connected to the connection point between D3 and D4, the other end is connected to the other pole of AC, and the capacitor C is connected in parallel. At the poles of the AC.
- Q5 is connected in parallel with D5, and Q6 is connected in parallel with D6.
- the anode of D5 is connected to the negative pole of DC
- the cathode is connected to the connection point of the second inductor and the alternating current source
- the anode of D6 is connected to the negative pole of DC
- the cathode is connected to the first inductor and the alternating current source. Connected to the point.
- the DC source may be a fuel cell, a nickel-hydrogen battery, an iron battery, a lead-acid battery, a solar panel, or the like, which provides a direct current device;
- the switch tube may be a MOSFET, an IGBT, a triode, a thyristor, etc.
- the diode may be a Schottky diode , fast recovery diode, silicon tube, silicon carbide, etc., and multiple diodes in series, etc., the switching tube and the diodes opposite thereto can be separate devices or a combined device or switching transistor parasitic diode; Is an isolation transformer.
- the output waveform can be a square wave, a sine wave, a triangular wave, a sawtooth wave, or the like.
- Embodiments of the present invention provide an inverter topology circuit capable of realizing a soft switch of a high frequency switch, effectively preventing turn-on and turn-off losses of the high frequency switch, and improving work efficiency.
- the inverter topology circuit provided by the embodiment of the present invention, as shown in FIG. 3B, includes a DC source DC, an AC source AC, a high frequency switch tube Ql, Q2, Q3, Q4, a power frequency switch tube Q5, Q6, and a high frequency filter.
- the DC source may be a fuel cell, a nickel-hydrogen battery, an iron battery, a lead-acid battery, a solar panel, or the like, which provides a direct current device;
- the switch tube may be a MOSFET, an IGBT, a triode, a thyristor
- the diode, etc. may be a Schottky diode, a fast recovery diode, a silicon tube, a silicon carbide, etc., and a plurality of diodes connected in series, etc., and the switching tube and the diode opposite thereto may be separate devices or a combined one.
- the AC source can be an isolation transformer.
- the output waveform can be a square wave, a sine wave, a triangular wave, a sawtooth wave, or the like.
- Embodiments of the present invention provide an inverter topology circuit capable of realizing a soft switch of a high frequency switch, effectively preventing turn-on and turn-off losses of the high frequency switch, and improving work efficiency.
- An embodiment of the present invention provides an inverter topology circuit, as shown in FIG. 4A, including a DC source DC, an AC source AC, a high frequency switch tube Ql, Q2, Q3, Q4, and a power frequency switch tube Q5, Q6, high.
- Q1 is connected in parallel with D1
- Q2 is connected in parallel with D2
- Q3 is connected in parallel with D3
- Q4 is connected in parallel with D4
- D1 and D2 are connected in series to form the first branch of the first bridge arm
- D3 and D4 are connected in series to form the second bridge arm.
- the branch, both branches are connected in parallel with the DC source, where the cathodes of D1 and D3 are connected to the anode of DC, and the anodes of D2 and D4 are connected to the cathode of DC.
- L1 is connected to the connection point between D1 and D2, and the other end is connected to one pole of AC; one end of L2 is connected to the connection point between D3 and D4, and the other end is connected to the other pole of AC; One end is connected to L2 and the other end is connected to a resistor R to form a series circuit, and R is located between C and L1.
- Q5 is connected in parallel with D5, and Q6 is connected in parallel with D6.
- the anode of D5 is connected to the negative pole of DC
- the cathode is connected to the connection point of L2 and AC
- the anode of D6 is connected to the negative pole of DC
- the cathode is connected at the connection point of L1 and AC.
- L3 is located on the connection circuit of L1 and AC, and one end of L3 is connected to D6 and Q6, and the other end is connected to one end of AC;
- L4 is located on the connection circuit of L2 and AC, and one end of L4 is connected to D5 and Q5, and the other end is connected to AC. another side.
- the DC source may be a fuel cell, a nickel-hydrogen battery, an iron battery, a lead-acid battery, a sun A circuit board or the like that provides a direct current device;
- the switch tube can be a MOSFET, an IGBT, a triode, a thyristor, etc.
- the diode can be a Schottky diode, a fast recovery diode, a silicon tube, a silicon carbide, etc., and a plurality of diodes in series, etc.
- the switching transistor and the diode opposite thereto may be separate devices or a combined device or switching transistor parasitic diode;
- the AC source may be an isolation transformer.
- the output waveform can be a square wave, a sine wave, a triangular wave, a sawtooth wave, or the like.
- the inverter topology circuit can be applied to a solar non-isolated inverter, the DC source is equivalent to a solar panel, the AC source is a power grid, and one end is connected to the ground at a distance, and the high-frequency current passes through a small resistance R and Capacitor C, when the power frequency inductors L3, L4 are frequency-frequency filtered, the voltages sandwiched between R and C are almost close to the voltage of the AC source. Therefore, the voltage change rate is small, so that the positive electrode of the solar panel having a large area has a small common-mode leakage current to the earth, and the safety is improved.
- This inverter topology circuit can also be applied to the buck Buck and boost Boost modes of operation. This inverter topology circuit can also be applied to reactive power compensation.
- Embodiments of the present invention provide an inverter topology circuit capable of realizing a soft switch of a high frequency switch, effectively preventing turn-on and turn-off losses of the high frequency switch, and improving work efficiency. It can compensate the reactive power, meet the requirements of the AC source load for inductive or capacitive, and improve the utilization of electric energy. It can also be used in boost and buck modes to achieve a wide range of voltage inputs. It can effectively prevent leakage current generated by solar non-isolated photovoltaic inverter circuits and improve safety.
- An embodiment of the present invention provides an inverter topology circuit, as shown in FIG. 4B, including a DC source DC, an AC source AC, a high frequency switch tube Ql, Q2, Q3, Q4, and a power frequency switch tube Q5, Q6, high.
- the DC source may be a fuel cell, a nickel-hydrogen battery, an iron battery, a lead-acid battery, a solar panel, or the like, which provides a direct current device;
- the switch tube may be a MOSFET, an IGBT, a triode, a thyristor, etc.
- the diode may be a Schottky diode , fast recovery diode, silicon tube, silicon carbide, etc., and multiple diodes in series, etc., the switching tube and the diodes opposite thereto can be separate devices or a combined device or switching transistor parasitic diode; Is an isolation transformer.
- the output waveform can be a square wave, a sine wave, a triangular wave, a sawtooth wave, or the like.
- Embodiments of the present invention provide an inverter topology circuit capable of realizing a soft switch of a high frequency switch, effectively preventing turn-on and turn-off losses of the high frequency switch, and improving work efficiency. It can compensate the reactive power, meet the requirements of the AC source load for inductive or capacitive, and improve the utilization of electric energy. It can also be used in boost and buck modes to achieve a wide range of voltage inputs. It can effectively prevent leakage current generated by solar non-isolated photovoltaic inverter circuits and improve safety.
- An embodiment of the present invention provides an inverter topology circuit, which can be used for reactive power compensation, as shown in FIG. 5B, including a DC source DC, an AC source AC, a high frequency switch tube Ql, Q2, Q3, Q4, and a power frequency.
- the anode of the DC, the anode of D2 and D4 is connected to the cathode of the DC.
- L1 One end of L1 is connected to the connection point between D1 and D2, and the other end is connected to one pole of AC;
- L2 is connected to the connection point between D3 and D4, and the other end is connected to the other pole of AC; one end of capacitor C is connected to L2 and the other end is connected to resistor R to form a series circuit, and R is located between C and L1.
- Q5 is connected in parallel with D5
- Q6 is connected in parallel with D6.
- the anode of D5 is connected to the negative pole of DC
- the cathode is connected at the connection point of L2 and AC
- the anode of D6 is connected to the negative pole of DC
- the cathode is connected at the connection point of L1 and AC.
- L3 is located on the connection circuit of L1 and AC, and one end of L3 is connected to D6 and Q6, and the other end is connected to one end of AC;
- L4 is located on the connection circuit of L2 and AC, and one end of L4 is connected to D5 and Q5, and the other end is connected to AC. another side.
- Capacitor C1 is connected in parallel to the two poles of the DC.
- the DC source may be a fuel cell, a nickel-hydrogen battery, an iron battery, a lead-acid battery, a solar panel, or the like, which provides a direct current device;
- the switch tube may be a MOSFET, an IGBT, a triode, a thyristor, etc.
- the diode may be a Schottky diode , fast recovery diode, silicon tube, silicon carbide, etc., and multiple diodes in series, etc., the switching tube and the diodes opposite thereto can be separate devices or a combined device or switching transistor parasitic diode; Is an isolation transformer.
- the output waveform can be a square wave, a sine wave, a triangular wave, a sawtooth wave, or the like.
- This inverter topology circuit can also be applied to solar non-isolated inverters, as well as buck Buck and boost Boost modes of operation.
- Embodiments of the present invention provide an inverter topology circuit capable of realizing a soft switch of a high frequency switch, effectively preventing turn-on and turn-off losses of the high frequency switch, and improving work efficiency. It can compensate the reactive power, meet the requirements of the AC source load for inductive or capacitive, and improve the utilization of electric energy. It can also be used in boost and buck modes to achieve a wide range of voltage inputs. It can effectively prevent leakage current generated by solar non-isolated photovoltaic inverter circuits and improve safety.
- An embodiment of the present invention provides an inverter topology circuit, as shown in FIG. 6A, including a DC source DC, an AC source AC, a high frequency switch tube Ql, Q2, Q3, Q4, and a power frequency switch tube Q5, Q6, high.
- Q1 is connected in parallel with D1
- Q2 is connected in parallel with D2
- Q3 is connected in parallel with D3, Q4 and D4 are connected.
- Parallel, Dl and D2 are connected in series to form the first branch of the first bridge arm
- D3 and D4 are connected in series to form the second branch of the first bridge arm
- both branches are connected in parallel to the DC source poles, wherein the cathode connections of D1 and D3
- the anode of the DC, the anode of D2 and D4 is connected to the cathode of DC.
- L1 is connected to the connection point between D1 and D2, and the other end is connected to one pole of AC; one end of L2 is connected to the connection point between D3 and D4, and the other end is connected to the other pole of AC; One end is connected to L2 and the other end is connected to a resistor R to form a series circuit, and R is located between C and L1.
- Q5 is connected in parallel with D5, and Q6 is connected in parallel with D6.
- the anode of D5 is connected to the cathode of DC, the cathode is connected to the connection point of L2 and AC; the anode of D6 is connected to the cathode of DC, and the cathode is connected at the connection point of L1 and AC.
- L3 is located on the connection circuit of L1 and AC, and one end of L3 is connected to D6 and Q6, and the other end is connected to one end of AC;
- L4 is located on the connection circuit of L2 and AC, and one end of L4 is connected to D5 and Q5, and the other end is connected to AC. another side.
- the cathodes of D7 and D8 are connected to the anode of DC, and the anode of D7 is connected to the cathode of D5, and the anode of D8 is connected to the cathode of D6.
- the DC source may be a fuel cell, a nickel-hydrogen battery, an iron battery, a lead-acid battery, a solar panel, or the like, which provides a direct current device;
- the switch tube may be a MOSFET, an IGBT, a triode, a thyristor, etc.
- the diode may be a Schottky diode , fast recovery diode, silicon tube, silicon carbide, etc., and multiple diodes in series, etc., the switching tube and the diodes opposite thereto can be separate devices or a combined device or switching transistor parasitic diode; Is an isolation transformer.
- the output waveform can be a square wave, a sine wave, a triangular wave, a sawtooth wave, or the like.
- This inverter topology circuit can also be applied to solar non-isolated inverters, as well as buck Buck and boost Boost modes of operation.
- Embodiments of the present invention provide an inverter topology circuit capable of realizing soft switching of a high frequency switch, effectively preventing turn-on and turn-off losses of the high frequency switch, and improving work efficiency. It can compensate reactive power, meet the requirements of inductive or capacitive AC source load, and improve the utilization of electric energy. Rate. It can also be used in boost and buck modes to achieve a wide range of voltage inputs. Moreover, the leakage current generated by the solar non-isolated photovoltaic inverter circuit can be effectively prevented, and the safety is improved.
- An embodiment of the present invention provides an inverter topology circuit, as shown in FIG. 6B, including a DC source DC, an AC source AC, a high frequency switch tube Ql, Q2, Q3, Q4, and a power frequency switch tube Q5, Q6, high.
- the cathodes of D5 and D6 are connected to the anode of the direct current source, the anode of D5 is connected to the connection point of the second inductor and the alternating current source, and the anode of D6 is connected to the first inductor and the alternating current.
- the anodes of D7 and D8 are connected to the negative pole of DC, and the cathode of D7 is connected to the anode of D5, and the cathode of D8 is connected to the anode of D6, and the rest is identical to that of the sixth embodiment, and will not be described again.
- the DC source may be a fuel cell, a nickel-hydrogen battery, an iron battery, a lead-acid battery, a solar panel, or the like, which provides a direct current device;
- the switch tube may be a MOSFET, an IGBT, a triode, a thyristor, etc.
- the diode may be a Schottky diode , fast recovery diode, silicon tube, silicon carbide, etc., and multiple diodes in series, etc., the switching tube and the diodes opposite thereto can be separate devices or a combined device or switching transistor parasitic diode; Is an isolation transformer.
- the output waveform can be a square wave, a sine wave, a triangular wave, a sawtooth wave, or the like.
- Embodiments of the present invention provide an inverter topology circuit capable of realizing a soft switch of a high frequency switch, effectively preventing turn-on and turn-off losses of the high frequency switch, and improving work efficiency. It can compensate the reactive power, meet the requirements of the AC source load for inductive or capacitive, and improve the utilization of electric energy. It can also be used in boost and buck modes to achieve a wide range of voltage inputs. It can effectively prevent leakage current generated by solar non-isolated photovoltaic inverter circuits and improve safety.
- Embodiments of the present invention provide an inverter topology circuit, which may include at least two inverter powers
- the bridge arm is described here by taking two bridge arms in parallel as an example.
- the DC source DC, the AC source AC, the high frequency switch tubes Q1, Q2, Q3, and Q4 in the first bridge arm, and the auxiliary conduction diodes D1, D2, D3, and D4 in the first bridge arm are included.
- high frequency switching tubes Qll, Q21, Q31, Q41 in the second bridge arm high frequency switching tubes Qll, Q21, Q31, Q41 in the second bridge arm, auxiliary conduction diodes D11, D21, D31, D41 in the second bridge arm, high frequency filter inductors L1, L2 in the first bridge arm , high frequency filter inductor L11, L21 in the second bridge arm, power frequency switch tube Q5, Q6, auxiliary conduction diode D5, D6, power frequency filter inductor L3, L4, resistor R for suppressing resonance, freewheeling diode D7, D8, and filter capacitor C.
- Q1 is connected in parallel with D1
- Q2 is connected in parallel with D2
- Q3 is connected in parallel with D3
- Q4 is connected in parallel with D4
- D1 and D2 are connected in series to form the first branch of the first bridge arm
- D3 and D4 are connected in series to form the second bridge arm.
- the branch, both branches are connected in parallel with the DC source, where the cathodes of D1 and D3 are connected to the anode of DC, and the anodes of D2 and D4 are connected to the cathode of DC.
- L1 is connected to the connection point between D1 and D2, and the other end is connected to one pole of AC; one end of L2 is connected to the connection point between D3 and D4, and the other end is connected to the other pole of AC; One end is connected to L2 and the other end is connected to a resistor R to form a series circuit, and R is located between C and L1.
- Q5 is connected in parallel with D5, and Q6 is connected in parallel with D6.
- the anode of D5 is connected to the negative pole of DC
- the cathode is connected to the connection point of L2 and AC
- the anode of D6 is connected to the negative pole of DC
- the cathode is connected at the connection point of L1 and AC.
- L3 is located on the connection circuit of L1 and AC, and one end of L3 is connected to D6 and Q6, and the other end is connected to one end of AC;
- L4 is located on the connection circuit of L2 and AC, and one end of L4 is connected to D5 and Q5, and the other end is connected to AC. another side.
- the cathodes of D7 and D8 are connected to the anode of DC, and the anode of D7 is connected to the cathode of D5, and the anode of D8 is connected to the cathode of D6.
- Q11 is connected in parallel with D11
- Q21 is connected in parallel with D21
- Q31 is connected in parallel with D31
- Q41 is connected in parallel with D41
- D11 and D21 are connected in series to form the first branch of the second bridge arm
- D31 and D41 are connected in series to form the second branch of the second bridge arm.
- Both branches are connected in parallel at the poles of the DC, where the cathodes of D11 and D31 Connected to the positive pole of the DC, the anodes of D21 and D4 are connected to the negative pole of DC, and the two branches of the second bridge arm are staggered in parallel with the two branches of the first bridge arm.
- L11 One end of L11 is connected to the connection point between D11 and D21, and the other end is connected to one pole of AC; one end of L21 is connected to the connection point between D31 and D41, and the other end is connected to the other pole of AC; Capacitor C One end is connected to L21 and the other end is connected to a resistor R to form a series circuit, and R is located between C and L11.
- the DC source may be a fuel cell, a nickel-hydrogen battery, an iron battery, a lead-acid battery, a solar panel, or the like, which provides a direct current device;
- the switch tube may be a MOSFET, an IGBT, a triode, a thyristor, etc.
- the diode may be a Schottky diode , fast recovery diode, silicon tube, silicon carbide, etc., and multiple diodes in series, etc., the switching tube and the diodes opposite thereto can be separate devices or a combined device or switching transistor parasitic diode; Is an isolation transformer.
- the output waveform can be a square wave, a sine wave, a triangular wave, a sawtooth wave, or the like.
- This inverter topology circuit can include two or more bridge arms for interleaving, which reduces output current ripple while increasing output power.
- This inverter topology circuit can also be applied to solar non-isolated inverters, to buck Buck and boost Boost modes, and to reactive power compensation.
- Embodiments of the present invention provide an inverter topology circuit capable of realizing a soft switch of a high frequency switch, effectively preventing turn-on and turn-off losses of the high frequency switch, and improving work efficiency. It can compensate the reactive power, meet the requirements of the AC source load for inductive or capacitive, and improve the utilization of electric energy.
- Multiple bridge arms can be connected in parallel to increase output power. They can also be used in boost and buck modes to achieve a wide range of voltage inputs. It can effectively prevent leakage current generated by solar non-isolated photovoltaic inverter circuits and improve safety.
- An embodiment of the present invention provides an inverter topology circuit, which may include at least two inverter circuit bridge arms.
- two bridge arms are connected in parallel as an example for description.
- the DC source DC, the AC source AC, the high frequency switch tubes Q1, Q2, Q3, Q4 in the first bridge arm, the first bridge arm Auxiliary conduction diodes D1, D2, D3, D4, high frequency switching tubes Qll, Q21, Q31, Q41 in the second bridge arm, auxiliary conduction diodes D11, D21, D31, D41 in the second bridge arm, High-frequency filter inductors L1 and L2 in the first bridge arm, high-frequency filter inductors L11 and L21 in the second bridge arm, power frequency switch tubes Q5 and Q6, auxiliary conduction diodes D5 and D6, power frequency filter inductor L3, L4, Resistor-resisting resistor R, freewheeling diodes D7, D8, and filter capacitor C.
- the cathodes of D5 and D6 are connected to the anode of the direct current source, the anode of D5 is connected to the connection point of the second inductor and the alternating current source, and the anode of D6 is connected to the first inductor and the alternating current.
- the anodes of D7 and D8 are connected to the negative pole of DC, and the cathode of D7 is connected to the anode of D5, and the cathode of D8 is connected to the anode of D6, and the rest is identical to that of the sixth embodiment, and will not be described again.
- the DC source may be a fuel cell, a nickel-hydrogen battery, an iron battery, a lead-acid battery, a solar panel, or the like, which provides a direct current device;
- the switch tube may be a MOSFET, an IGBT, a triode, a thyristor, etc.
- the diode may be a Schottky diode , fast recovery diode, silicon tube, silicon carbide, etc., and multiple diodes in series, etc., the switching tube and the diodes opposite thereto can be separate devices or a combined device or switching transistor parasitic diode; Is an isolation transformer.
- the output waveform can be a square wave, a sine wave, a triangular wave, a sawtooth wave, or the like.
- Embodiments of the present invention provide an inverter topology circuit capable of realizing a soft switch of a high frequency switch, effectively preventing turn-on and turn-off losses of the high frequency switch, and improving work efficiency. It can compensate the reactive power, meet the requirements of the AC source load for inductive or capacitive, and improve the utilization of electric energy.
- Multiple bridge arms can be connected in parallel to increase output power. They can also be used in boost and buck modes to achieve a wide range of voltage inputs. It can effectively prevent leakage current generated by solar non-isolated photovoltaic inverter circuits and improve safety.
- the embodiment of the present invention provides an inverter method. As shown in FIG. 3C, Q3, Q4, and Q6 are turned off during a half cycle of Q5 turn-on, and Ql and Q2 are high-frequency under the action of control voltage or control current. On-off control. When Ql is turned on and Q2 is turned off, current flows from the positive pole of the DC source, flows through Ql, Ll, C, and Q5, and finally returns to the negative pole of the DC source. Some of the current flows through the negative terminals of L1, AC source, and Q5 to the DC source. At this time, the current on L1 gradually increases, and at the same time, the power is output to the AC source.
- Q1, Q2, and Q5 are turned off during the half cycle of Q6 turn-on. Under the control voltage or control current, Q3 and Q4 perform high-frequency on-off control.
- Embodiments of the present invention provide an inverter method capable of realizing soft switching of a high frequency switch, effectively preventing turn-on and turn-off loss of a high frequency switch, and improving work efficiency.
- An embodiment of the present invention provides an inversion method, as shown in FIG. 3B, in this embodiment, only
- the cathodes of D5 and D6 are connected to the anode of the direct current source, the anode of D5 is connected to the connection point of the second inductor and the alternating current source, and the anode of D6 is connected at the connection point of the first inductor and the alternating current source.
- the rest is the same as the tenth embodiment. For details, refer to the tenth embodiment, and details are not described herein again.
- Embodiments of the present invention provide an inverter method capable of realizing soft switching of a high frequency switch, effectively preventing turn-on and turn-off loss of a high frequency switch, and improving work efficiency.
- Example twelve The embodiment of the present invention provides an inverter method. As shown in FIG. 4C, Q3, Q4, and Q6 are turned off during a half cycle of Q5 turn-on, and Ql and Q2 are high-frequency under the action of control voltage or control current. On-off control.
- the inverter topology circuit can be applied to a solar non-isolated inverter, the DC source is equivalent to a solar panel, the AC source is a power grid, and one end is connected to the ground at a distance, and the high-frequency current passes through a small resistance R and Capacitor C, when the power frequency inductors L3, L4 are frequency-frequency filtered, the voltages sandwiched between R and C are almost close to the voltage of the AC source. Therefore, the rate of voltage change is small, so the area is large.
- the positive pole of the solar panel produces a small common mode leakage current to the earth.
- FIG. 4E is a schematic diagram of the buck Buck and boost Boost modes.
- FIG. 4A Equivalent circuit diagram, when the output voltage is less than the DC source voltage, the circuit works in Buck mode, Ql, Q2 (D2), Ll, C, R, L3, L4, Q5 participate in the operation, when Ql is turned on, the inductor current of L1 Increase; When Q1 turns off, Q2 turns on, and inductor L1 starts to flow.
- the inverter topology circuit can also be applied to reactive power compensation, as shown in FIG. 4A, using bipolar modulation, Ql, Q4 are simultaneously turned on or off; Q3, Q2 are turned on or off; Q5, Q6 are not involved in the work. .
- This mode of operation can be continuous for the inductor.
- the inductor current critical mode is analyzed as above, and the inductor current is a small negative value.
- Embodiments of the present invention provide an inverter method capable of realizing soft switching of a high frequency switch, effectively preventing turn-on and turn-off loss of a high frequency switch, and improving work efficiency. It can compensate the reactive power, meet the requirements of the AC source load for inductive or capacitive, and improve the utilization of electric energy. It is also available in boost and buck modes for a wide range of voltage inputs. It can effectively prevent leakage current generated by solar non-isolated photovoltaic inverter circuits and improve safety.
- An embodiment of the present invention provides an inverter method. As shown in FIG. 4B, in this embodiment, only the cathodes of D5 and D6 are connected to the anode of the DC source, and the anode of D5 is connected to the second inductor and the AC source. At the connection point, the D6 anode is connected at a connection point of the first inductor and the alternating current source, The rest is the same as that in the embodiment 12. For details, refer to the embodiment 12, and details are not described herein again. Embodiments of the present invention provide an inverter method capable of realizing soft switching of a high frequency switch, effectively preventing turn-on and turn-off losses of the high frequency switch, and improving work efficiency.
- the embodiment of the invention provides an inverter method, which can be used for reactive power compensation, as shown in FIG. 5A, which is a schematic diagram of relationship between output voltage and output current.
- FIG. 5A is a schematic diagram of relationship between output voltage and output current.
- the output voltage and the output current are in phase, as shown in FIG. 5C.
- FIG. 5E the working principle is the same as the normal active output of the inverter circuit, and reference may be made to Embodiment 12, and details are not described herein again.
- the utility power fills the inverter with reactive power.
- Q4 is the main switch
- Q6 is the sub-switch
- Ql, Q2, Q3, and Q5 are turned off.
- Q4 is turned on
- the current flows from the AC source, flows through L4, L2, Q4, Q6 (D6), L3, and finally returns to the AC source; the other path is the current flowing from C through L2, Q4, Q6 (D6) , R, finally return to C to form a loop.
- Q4 is turned off (Q6 is still on)
- the current on L2 flows through D3 to C1 and through Q6 (D6) to form a loop. Adjusting the on-time of Q4 can result in different output currents.
- Q2 is the main switch
- Q5 is the sub-switch
- Ql, Q3, Q4, and Q6 are turned off.
- Q2 is turned on
- the current flows from the AC source, flows through L3, L1, Q2, Q5 (D6), L4, and finally returns to the AC source; the other path is that the current flows from C through R, L1, Q2, Q5 ( D5), finally return to C to form a loop.
- Q2 is turned off (Q5 is still on)
- the current on L1 flows through D1 to C1 and through Q5 (D5) to form a loop. Adjust the on-time of Q2 to get different output currents.
- Embodiments of the present invention provide an inverter method capable of realizing soft switching of a high frequency switch, effectively preventing turn-on and turn-off losses of the high frequency switch, and improving work efficiency. It can compensate the reactive power, meet the requirements of the AC source load for inductive or capacitive, and improve the utilization of electric energy. It can also be used in boost and buck modes to achieve a wide range of voltage inputs. Moreover, the leakage current generated by the solar non-isolated photovoltaic inverter circuit can be effectively prevented, and the safety is improved.
- the embodiment of the invention provides an inverter method, which can be used for reactive power compensation, as shown in FIG. 6A, wherein the diodes D7 and D8 function as freewheeling. Bipolar modulation can be used.
- Ql and Q5 are switched at the same time, Q2 (D2) and D7 will continue to flow at the same time.
- Q4 (D4) and D8 will continue to flow at the same time.
- the operating mode of this circuit can be continuous inductor, as shown in Figure 4G for the inductor current critical mode, or the inductor current is a small negative value.
- This inverter topology circuit can also be applied to solar non-isolated inverters, as well as buck Buck and boost Boost modes of operation.
- solar non-isolated inverters as well as buck Buck and boost Boost modes of operation.
- buck Buck and boost Boost modes of operation For details, refer to Embodiment 12, and details are not described herein again.
- Embodiments of the present invention provide an inverter topology circuit capable of realizing a soft switch of a high frequency switch, effectively preventing turn-on and turn-off losses of the high frequency switch, and improving work efficiency. It can compensate the reactive power, meet the requirements of the AC source load for inductive or capacitive, and improve the utilization of electric energy. It can also be used in boost and buck modes to achieve a wide range of voltage inputs. It can effectively prevent leakage current generated by solar non-isolated photovoltaic inverter circuits and improve safety.
- An embodiment of the present invention provides an inversion method, as shown in FIG. 6B, in this embodiment, only
- the cathodes of D5 and D6 are connected to the anode of the direct current source, the anode of D5 is connected to the connection point of the second inductor and the alternating current source, and the anode of D6 is connected at the connection point of the first inductor and the alternating current source.
- the anodes of D7 and D8 are connected to the anode of DC, and the cathode of D7 is connected to the anode of D5, and the cathode of D8 is connected to the anode of D6.
- Embodiments of the present invention provide an inverter method capable of realizing soft switching of a high frequency switch, effectively preventing turn-on and turn-off losses of the high frequency switch, and improving work efficiency.
- Able to compensate for reactive power The power meets the requirements of the AC source load for inductive or capacitive, and improves the utilization of electric energy. It can also be used in boost and buck modes to achieve a wide range of voltage inputs. Moreover, the leakage current generated by the solar non-isolated photovoltaic inverter circuit can be effectively prevented, and the safety is improved.
- an embodiment of the present invention provides an inverter method.
- the inverter topology circuit may include two or more bridge arms to implement interleaving, thereby reducing output current ripple and improving For the output power, the working principle is similar to that of the embodiment 12.
- the embodiment 12 For details, refer to the embodiment 12, and details are not described herein again.
- This inverter topology circuit can also be applied to solar non-isolated inverters, to buck Buck and boost Boost modes, and to reactive power compensation.
- solar non-isolated inverters to buck Buck and boost Boost modes
- reactive power compensation to reactive power compensation.
- Embodiments of the present invention provide an inverter method capable of realizing soft switching of a high frequency switch, effectively preventing turn-on and turn-off loss of a high frequency switch, and improving work efficiency. It can compensate the reactive power, meet the requirements of the AC source load for inductive or capacitive, and improve the utilization of electric energy.
- Multiple bridge arms can be connected in parallel to increase output power. They can also be used in boost and buck modes to achieve a wide range of voltage inputs. It can effectively prevent the leakage current generated by the solar non-isolated photovoltaic inverter circuit and improve safety.
- An embodiment of the present invention provides an inverter method.
- FIG. 7B in this embodiment, only the cathodes of D5 and D6 are connected to the anode of the DC source, and the anode of D5 is connected to the second inductor and the AC source.
- the D6 anode is connected to the connection point of the first inductor and the alternating current source, and the anodes of D7 and D8 are connected to the negative pole of DC, and the cathode of D7 is connected to the anode of D5, and the cathode of D8 is connected to the cathode of D6.
- the anode refer to the seventeenth embodiment, and details are not described herein again.
- Embodiments of the present invention provide an inverter method capable of realizing soft switching of a high frequency switch, effectively preventing turn-on and turn-off losses of the high frequency switch, and improving work efficiency. It can compensate the reactive power, meet the requirements of the AC source load for inductive or capacitive, and improve the utilization of electric energy. can Achieve multiple bridge arms in parallel to increase output power, and can also be used in boost and buck modes to achieve a wide range of voltage inputs. Moreover, the leakage current generated by the solar non-isolated photovoltaic inverter circuit can be effectively prevented, and the safety is improved.
- An embodiment of the present invention provides an inverter, including the inverter topology circuit of Embodiments 1 to 9.
- Embodiments of the present invention provide an inverter capable of realizing soft switching of a high frequency switch, effectively preventing turn-on and turn-off losses of the high frequency switch, and improving work efficiency. It can compensate the reactive power, meet the requirements of the AC source load for inductive or capacitive, and improve the utilization of electric energy.
- Multiple bridge arms can be connected in parallel to increase output power. They can also be used in boost and buck modes for a wide range of voltage inputs. It can effectively prevent the leakage current generated by the solar non-isolated photovoltaic inverter circuit and improve the safety.
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AU2012254901A AU2012254901B2 (en) | 2011-10-17 | 2012-05-21 | Inverter topology circuit, inversion method and inverter |
EP20120766268 EP2568592A4 (en) | 2011-10-17 | 2012-05-21 | INVERTER TOPOLOGICAL CIRCUIT, CONFIGURATION METHOD AND INVERTER |
JP2013516999A JP5633085B2 (ja) | 2011-10-17 | 2012-05-21 | インバータトポロジ回路、逆変換方法、およびインバータ |
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JP5633085B2 (ja) | 2014-12-03 |
AU2012254901A1 (en) | 2013-05-02 |
EP2568592A4 (en) | 2014-01-22 |
AU2012254901B2 (en) | 2014-05-22 |
CN102437765B (zh) | 2015-09-23 |
US20130114321A1 (en) | 2013-05-09 |
JP2013529457A (ja) | 2013-07-18 |
CN102437765A (zh) | 2012-05-02 |
US8564973B2 (en) | 2013-10-22 |
EP2568592A1 (en) | 2013-03-13 |
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