ST STEVAL－ISV001V1 1 kW太阳能逆变器解决方案

发布时间：2012-6-28 11:59 发布者：1770309616

ST公司的STEVAL-ISV001V1是采用STP160N75F3的1 kW太阳能逆变器解决方案,输入电压20 V到28 V,交流正弦波输出电压230 Vrms( 50 Hz),输出功率1kW,效率90%,DC/DC转换部分开关频率100kHz,DC/AC部分开关频率16kHz.本文介绍了离线UPS系统方框图,PV转换中的DC/AC转换器方框图以及STEVAL-ISV001V1评估板主要指标,方框图,电路图,材料清单和1 KW逆变器PCB元件布局图.

In a UPS system, a DC-AC converter is always used to convert the DC power from the batteries to AC power used to supply the load. The basic scheme also includes a battery pack, a battery charger which converts AC power from the grid into DC power, and a transfer switch to supply the load from the mains or from the energy storage elements if a line voltage drop or failure occurs.

图1.离线UPS系统方框图

Another application where a DC-AC converter is always required is shown in the block diagram of Figure 2. In this case, the converter is part of a conversion scheme commonly used in standalone photovoltaic systems. An additional DC-DC converter operates as a battery charger while performing a maximum power point tracking algorithm (MPPT), which is necessary to maximize the energy yield from the PV array. The battery pack is always present to store energy when solar radiation is available and release it at night or during hours of low insolation.

图2.PV转换中的DC/AC转换器方框图

STEVAL-ISV001V1评估板

The STEVAL-ISV001V1 demonstration board implements a 1 kW dual stage DC-AC converter, suitable for use in battery powered uninterruptible power supplies (UPS) or photovoltaic (PV) stand alone systems. The converter is powered from a low DC input voltage varying from 20 V to 28 V and is capable of supplying up to 1 kW output power on a single phase AC load. These features are met with a dual stage conversion topology including an efficient step-up push-pull DC-DC converter, to produce a regulated high voltage DC bus, and a sinusoidal h-bridge PWM inverter to generate a 50 Hz, 230 Vrms output sine wave. Other relevant features of the propose system are high power density, high switching frequency, galvanic isolation and efficiency greater than 90% over a wide output load range.

图3.1 KW逆变器方框图

1 KW逆变器系统指标:

This STEVAL-ISV001V1 board implements a 1 kW dual stage DC-AC converter, suitable for use in batterypowered uninterruptible power supplies (UPS) or photovoltaic (PV) standalone systems.

The converter is fed by a low DC input voltage varying from 20 V to 28 V, and is capable of
supplying up to 1 kW of output power on a single-phase AC load. These features are possible thanks to a dual stage conversion topology that includes an efficient step-up pushpull DC-DC converter, which produces a regulated high-voltage DC bus and a sinusoidal HBridge PWM inverter to generate a 50 Hz, 230 Vrms output sine wave. Other key features of the system proposed are high power density, high switching frequency and efficiency greater than 90% over a wide output load range.