Case 2 : DC Bus connected n parallel to a single AC-fed inverter

AC power

 

supply

 

+

INV #1

-

 

 

INV #2

 

INV #n

ØPay attention to the selection of the main inverter (#1) because all the input current flows through

 

 

 

 

 

 

 

 

 

iM1

the rectifier bridge of this inverter. (*2)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

M 1

Ø Need sufficient time for EEPROM to store the data.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(Refer to Case 1)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

iM2

Ø Use DC choke. (Refer to Case 1)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

<Selection of the main inverter kW>

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

M 2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

n

 

 

 

 

 

 

 

 

 

 

 

 

 

Input current is1 = åik

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

k =2

AC input

iMn

M n

i2

(*2) Capacity of the main inverter

Rated current of the main inverter should be higher than;

ØTotal rated current of the inverters

 

and

 

 

in

Ø

Possible highest total motor current

 

 

 

 

 

[Example of 4 inverters in parallel]

Ø INV#1~#4=SJ300-040HFx (8.6A rated)

ØiM1(max) = iM2(max) = iM3(max) = iM4(max) = 9.0Arms

In this case, the total motor current under the possible worst case is higher than that of the inverters.

Total inverter rated current

= i1 + i2 + i3 + i4 = 8.6 * 4

= 32.2 Arms

Total motor current under possible worst case

= iM1( max) + iM2(max) + iM3(max) + iM4(max)

= 36Arms

àMain inverter must therefore be SJ300-185HFx (38A) or larger. SJ300-220HFx is suggested to provide additional safety margin.

Page 4
Image 4
Hitachi AN091802-1 instruction manual Rectifier bridge of this inverter. *2

AN091802-1 specifications

The Hitachi AN091802-1 is a high-performance semiconductor device recognized for its versatile applications in various electronic systems. This integrated circuit (IC) is predominantly used in power management and control systems, making it a critical component in modern electronic designs.

One of the main features of the AN091802-1 is its exceptional energy efficiency. It employs advanced power management technologies that allow devices to operate with minimal power wastage, making it an ideal choice for battery-operated devices and renewable energy systems. With a low quiescent current, the IC ensures longevity and reliability, especially in applications where power conservation is paramount.

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In summary, the Hitachi AN091802-1 is a feature-rich integrated circuit known for its energy efficiency, versatile voltage compatibility, robust protection mechanisms, and space-saving design. Its advanced technologies make it a reliable and effective component for various electronic applications, reflecting Hitachi's commitment to innovation in semiconductor solutions.