Monopole inverter capable of boosting voltage

An inverter and single-stage technology, which is applied in the field of new single-stage boostable inverters, can solve the problems that the voltage level of the capacitor cannot be fully utilized, it is easy to cause resonance, and the devices cannot be turned on at the same time, so as to achieve a large voltage difference Power transfer transfer, avoid output current waveform distortion, reduce the effect of external boost circuit

Inactive Publication Date: 2009-12-09
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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AI Technical Summary

Problems solved by technology

For DC/AC power conversion applications with low DC voltage and higher AC output voltage, an additional DC/DC boost converter is required. This additional power conversion stage increases the cost of the system and reduces the conversion efficiency.
[0005] (3) The upper and lower devices of each bridge arm cannot be turned on at the same time, whether it is intentional or caused by electromagnetic interference, otherwise, a direct short circuit will occur and the device will be damaged
[0016] (1) Due to the addition of a Z-source network, which is a two-port network including inductance and capacitance, under certain conditions, the inductance and capacitor of the Z-source network will resonate. When designing and controlling the Z-source inverter, it must Consider strategies to avoid resonance, once resonance occurs, it will affect the normal operation of the circuit
Since the capacitor voltage is 0 when starting, there is a large

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  • Monopole inverter capable of boosting voltage
  • Monopole inverter capable of boosting voltage
  • Monopole inverter capable of boosting voltage

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[0031] As attached Figure 4 As shown, in addition to the three-phase switch bridge (B) of the traditional voltage-type inverter, the new single-stage boostable inverter topology of the present invention adds a tightly coupled inductor (its same name) composed of inductors (L1, L2) The terminals are marked in the figure), capacitor (C), blocking diode (D), and switch tube (T) for the energy feedback channel (can be omitted if energy feedback is not required). One end of the inductor (L1) is connected to the positive phase of the DC power supply, and the other end is connected in series with a reverse blocking diode (D), and then connected to one end of the inductor (L2) and connected to the positive end of the DC bus of the inverter bridge (B). The other end of (L2) is connected in series with the positive terminal of the capacitor (C), and the negative terminal of the capacitor (C) is connected with the negative terminal of the DC bus of the inverter bridge (B), and then connecte...

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Abstract

The invention relates to a novel monopole inverting circuit capable of boosting voltage, and topology is shown in an attached figure. Besides a three-phase switch bridge (B) of the conventional voltage type inverter, the circuit is additionally provided with a tightly coupled inductor consisting of inductors (L1, L2), a capacitor (C), an interdiction diode (D) and a switch tube (T) for an energy feedback passage (can be removed if no energy is needed to feedback). The voltage boosting control mode of the circuit to an inverter direct current bus uses the state of the through zero vector of the upper and lower switch tubes emitted by the three-phase inverter bridge during zero vector to adjust the action time so as to realize the controllable promotion of direct current bus voltage of the input side of the inverter. The inductors (L1 and L2) are tightly coupled, when the inductors are in a state of through zero vector, the inverter is directly communicated, and a DC voltage source (Vs) charges a couple inductor (L1); and when the inductors are in a state of non-through zero vector, the inductors release energy to supply power to the direct current bus of the inverter (B); the voltage of the direct current bus of the inverter is obtained by lapping the voltage of the inductor (L2) and the voltage of the capacitor (C) so as to enable the voltage of the direct current bus of the inverter to be improved, so that the inverter voltage is boosted.

Description

technical field [0001] The invention relates to a novel single-stage boostable inverter, which is especially suitable for motor drive system occasions in which a DC bus needs to be powered by a low-voltage booster and new energy power generation inverter occasions suitable for a large input voltage variation range. Background technique [0002] The traditional voltage source inverter inputs DC voltage and outputs AC voltage, and has a wide range of applications. The input DC voltage of the voltage source inverter can be obtained from the power grid or the rotating AC motor through rectification and filtering, and can also be obtained from batteries, fuel cells or photovoltaic cells, corresponding to general industrial applications (such as frequency converters), electric vehicles, renewable energy Distributed power generation and other occasions. In the voltage source inverter, due to the input DC voltage, the power semiconductor device is always kept forward biased, so the...

Claims

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Application Information

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IPC IPC(8): H02M7/44H02M7/48H02J3/38
Inventor 黄文新胡育文杨奇
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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