Three-level parallel resonance dc-dc current transformer
A dc-dc, converter technology, applied in the direction of regulating electrical variables, converting DC power input to DC power output, and converting irreversible AC power input to DC power output, etc. The difficulty of converter design, the complex control of three-level converters, etc., achieve the effect of efficient and stable operation and cost reduction.
Inactive Publication Date: 2009-07-08
ZHEJIANG UNIV
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Problems solved by technology
[0003] However, in general, three-level converters include clamping diodes or flying capacitors, or both, which increases the difficulty of converter design in terms of cost.
Secondly, the control of traditional zero-current or zero-voltage three-level converters is more complicated, and additional dead time needs to be added to avoid excessive voltage spikes of the external switching tubes of the three-level converter
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[0014] Refer to figure 1 , A three-level parallel resonant dc-dc converter of the present invention includes:
[0015] 1) Voltage dividing capacitor 110, composed of two capacitors C 1 , C 2 Series composition, used to divide the input voltage to generate two voltage sources that are only half of the input voltage;
[0016] 2) The inverter 120 consists of four switch tubes S 1 , S 2 , S 3 , S 4 Series composition, used to invert the DC voltage into square wave or step wave voltage, where the second switch tube S 2 Source and third switch S 3 The connection point of the drain is connected to the midpoint of the voltage divider capacitor;
[0017] 3) Parallel resonant network 130, including resonant capacitor C r , Resonant inductance L rp And DC blocking capacitor C b , Resonant capacitor C r And the resonant inductor L rp And DC blocking capacitor C b Connected. The resonant network 130 is connected to the first switching tube S 1 Source and second switch S 2 The connection point ...
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The invention discloses a three-level parallel-resonance type dc-dc converter, which comprises a voltage-dividing capacitor, an inverter consisting of four switching tubes that are connected in series, a parallel resonance network, an isolation commutated network and a filter network. The converter omits a traditional clamping diode and a flying capacitor, so that the cost is saved; in addition, the introduction of the converter into the parallel resonance network ensures that primary side switching tubes are switched on under electric null, and secondary side diodes are switched off under zero current, thereby effectively reducing the switching loss; and the voltage stress of each switching tube is half the input supply voltage at the same time. The converter is very beneficial for the design of a high-frequency high-density power supply under high input voltage.
Description
Technical field [0001] The invention relates to a DC-DC converter, in particular a three-level parallel resonance DC-DC converter. Background technique [0002] The improvement of dc-dc converter efficiency and power density in high-voltage applications is a very critical issue in the power supply industry at present. In order to obtain good performance under high voltage occasions, three-level converters came into being. At the same time, in order to obtain a better soft switching effect, the technology of parallel resonance has also been proposed by scholars and widely used to reduce switching losses. [0003] However, usually three-level converters include clamping diodes or flying capacitors, or both, which increases the difficulty of converter design in terms of cost. Secondly, the traditional zero-current or zero-voltage three-level converter is more complicated to control, and additional dead time needs to be added to avoid excessive voltage spikes of the external switch t...
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IPC IPC(8): H02M3/24H02M7/02
Inventor 陈威张伟吕征宇
Owner ZHEJIANG UNIV