Single stage, bi-directional voltage increase and decrease DC converter type ring joint inverter in high frequency
A DC converter, buck-boost technology, applied in the direction of converting DC power input to DC power output, irreversible DC power input converting to AC power output, and converting equipment with intermediate conversion to AC, which can solve the problem of high cost. , low power density and low reliability, to achieve the effect of low cost, low audio noise and high conversion efficiency
Active Publication Date: 2009-04-08
FUZHOU UNIV
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[0005] Although the above high-frequency link inverters such as unidirectional Buck type, unidirectional Buck type high-frequency pulsed DC link, bidirectional Buck type, bidirectional Buck-Boost type, two-stage Buck or Buck-Boost DC converter type have many advantages, However, they are all two-stage or quasi-two-stage converter cascaded circuit structures, and there are still defects such as low conversion efficiency, power density and reliability, and high cost.
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[0013] Single-stage bidirectional Buck-Boost DC converter type high-frequency link inverter is composed of two identical high-frequency electrically isolated bidirectional power flow Buck-Boost DC converters that output anti-phase low-frequency sinusoidal pulsating DC voltage with a differential circuit ,Such as figure 1 , 2 shown. In Fig. 2, Fig. 2 (a) is the circuit topology, and Fig. 2 (b) is the waveform of the circuit principle. When the inverter switch S 11 (S 21 ) when the duty cycle D is greater or less than 0.5, the instantaneous value u of the low-frequency sinusoidal pulsating DC voltage output by the high-frequency electrical isolation bidirectional power flow Buck-Boost DC converter o1 and u o2 higher or lower than the input DC voltage U i Compared with the high-frequency energy storage transformer turns ratio (N 2 / N 1 ) product (U 1 N 2 / N 1 ), so it is called a single-stage bidirectional buck-boost DC converter type high-frequency link inverter. As s...
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The inverter belongs to electronic converter technique of electric power. Circuit topology is composed of differential circuit including two identical boosting dc converters of bi-directional power streams insulated in high frequency, and the said two converters output sinusoidal pulsating dc voltage in reversed phases. Converting dc to needed sinusoidal ac, the inverter possesses advantages of compact topology, isolation in high frequency between ac load and dc source, bi-directional power streams, power conversion in single stage, small size, low weight, high conversion efficiency, low audio noise, and high reliability in short circuit of load, low cost and wide application foreground. The invention establishes key technology of new type inversion power source and static converter in middle and large power.
Description
technical field [0001] The single-stage bidirectional buck-boost (Buck-Boost) DC converter type high-frequency link inverter involved in the present invention belongs to the power electronic conversion technology. Background technique [0002] The inverter is a static conversion device that uses power semiconductor devices to convert direct current into alternating current for use with alternating current loads. An inverter with high-frequency electrical isolation between the output AC load and the input DC power supply is called a high-frequency link inverter. High-frequency link inverter, because the transformer used to realize the output and input electrical isolation and voltage matching function is above 20kHz, its volume, weight and audio noise are greatly reduced, and the shortcomings of the low-frequency link inverter are overcome. It has wide application prospects in the inverter occasions where DC generators, storage batteries, solar cells and fuel cells are the m...
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IPC IPC(8): H02M7/48H02M7/537H02M3/28H02M3/335H02M1/14
Inventor 陈道炼
Owner FUZHOU UNIV