power conversion system
A technology of power conversion system and power conversion circuit, which is applied in the direction of high-efficiency power electronic conversion, control/regulation system, output power conversion device, etc., and can solve the problems of step-down circuit topology inoperability and switch duty cycle reduction.
Active Publication Date: 2022-04-05
DELTA ELECTRONICS INC
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Problems solved by technology
In applications where the input voltage is greater than the output voltage, the duty cycle of the switch is correspondingly smaller, so that the topology of the step-down circuit cannot work in an optimal state.
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[0109] Some typical embodiments embodying the features and advantages of the present disclosure will be described in detail in the description in the following paragraphs. It should be understood that the present disclosure can have various changes in different embodiments without departing from the scope of the present disclosure, and that the descriptions and illustrations therein are illustrative in nature and not restrictive. This disclosure.
[0110] Figure 2A It is a schematic diagram of the circuit structure of the first power conversion circuit in a preferred embodiment of the present disclosure, Figure 3A and Figure 3B is the waveform diagram of the driving signals of each switch in the first power conversion circuit at different duty ratios, Figure 4A It is a schematic diagram of the circuit structure of the first power conversion system according to the first embodiment of the present disclosure, Figure 4B for display Figure 4A The waveform diagram of the...
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The disclosure provides a power conversion system, including a power conversion circuit, a power supply circuit and at least one pre-charging circuit. The power conversion circuit includes an input terminal, an output terminal, a plurality of cascaded switching power conversion units and at least one energy storage device. The energy storage device is coupled in series between the input end and the output end. The power supply circuit is electrically connected to the power conversion circuit to receive the input voltage and output the power supply voltage to the power conversion circuit, and includes a magnetic element. The pre-charging circuit is used to charge the energy storage device of the power conversion circuit. The pre-charging circuit includes a connected winding and a rectification filter circuit. The winding is coupled with a magnetic element to receive the converted voltage. The rectification filter circuit is electrically connected to the corresponding energy storage device. The two ends of the switch are used to receive the converted voltage and output the charging voltage to the corresponding energy storage device.
Description
technical field [0001] The present disclosure relates to a power conversion system, in particular to a power conversion system with a pre-charging circuit. Background technique [0002] In the existing non-isolated high-current step-down applications, a parallel 2-phase step-down circuit topology is mostly used, such as figure 1 As shown, it uses parallel connection to reduce the current stress on each switch tube, and uses a switch with a duty cycle of 180 degrees out of phase to drive each phase step-down circuit to reduce the current ripple. However, the voltage transfer ratio between the output voltage and the input voltage of the step-down circuit topology is the switch duty cycle, ie Vo=Vin*D. In applications where the input voltage is greater than the output voltage, the duty cycle of the switch is correspondingly smaller, so that the topology of the step-down circuit cannot work in an optimal state. [0003] Therefore, how to develop a power conversion system that ...
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IPC IPC(8): H02M3/158
CPCH02M3/1584Y02B70/10
Inventor 金达熊雅红宿清华
Owner DELTA ELECTRONICS INC