双级输入升压型DC-DC变换器功率转换实用性设计

Practical Design for Dual Input Step-up DC-DC Converter

多输入升压型DC恒压输出变换器在逆变电源中是常见的组成部分。论文针对12V与24V双输入提出了功率转换一体的开关电源的方案,设计了电位逻辑监测电路,高频升压变压器的绕组分布以及与之对应的输出恒压自动切换电路。电位逻辑监测电路可以根据输入母线电压的不同状态(欠压、过压、正常)进行判断,从而通过控制PWM模块并控制整个电路的启停。输出恒压自动切换电路确保在不同输入电压下有安全稳定的电压输出。对推挽拓扑所接的高频升压变压器进行了特殊的绕组分布设计,以适应两种不同的输入电压。在升压变压器之后的自动切换的输出恒压电路可以确保不同输入时有恒定的电压输出,在此给出了两种不同的设计方案。把双输入升压型DC-DC恒压输出开关变换器设计方案运用到一款输出为5000Watt的逆变电源上进行验证。

Multiple-input step-up DC-DC converters are commonly used in inverters. This paper focuses on a scheme of the switching power supply with the input of 12 V or 24 V,including the potential monitoring module,high frequency step-up transformer and corresponding transverter for the constant output. According to the input potentials such as low voltage,over voltage and normal voltage,the monitoring module makes decisions to control the whole system via PWM module. The output transverter assures the constant output under the different inputs automatically. A specific winding distribution design is adopted on the high frequency transformer which is connected with push-pull topology in order to adapt to two different input voltages. The automatic output circuit is able to assure constant output voltage under different inputs with the help of step-up transformer. Two schemes are proposed and verified by applying it into an inverter with 12 V/24 V input and 220 V/50 Hz 5 000 Watt output.