MIC4606 datasheet(29/40 Pages) MICROCHIP

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DS20005604D-page 29

MIC4606

FIGURE 7-10:

Full-Bridge DC Motor.

7.12

Power Inverter

Power inverters are used to supply AC loads from a DC

operated battery system, mainly during power failure.

The battery voltage can be 12 VDC, 24 VDC or up to

36 VDC, depending on the power requirements. There

are two popular conversion methods: Type I and

Type II that convert the battery energy to AC line

voltage (110 VAC or 230 VAC).

FIGURE 7-11:

Type I Inverter Topology.

As shown in Figure 7-11, Type I is a dual stage topology,

where line voltage is converted to DC through a trans-

former to charge the storage batteries. When a power

failure is detected, the stored DC energy is converted to

AC through another transformer to drive the AC loads

connected to the inverter output. This method is simplest

to design, but tends to be bulky and expensive because

it uses two transformers.

Type II is a single-stage topology that uses only one

transformer to charge the bank of batteries to store the

energy. During a power outage, the same transformer

is used to power the line voltage. The Type II topology

switches at a higher frequency as compared to the

Type I topology to maintain a small transformer size.

Both types use a full-bridge topology to invert DC to AC.

The MIC4606’s operating voltage offers enough of a

margin to address all of the available banks of batteries

commonly used in inverter applications. The 85V oper-

ating voltage allows designers to increase the bank of

batteries up to 72V, if desired. The MIC4606 can sink as

much as 1A, which is sufficient to drive the MOSFET’s

gate capacitance while switching the MOSFET up to

50 kHz. This makes the MIC4606 an ideal solution for

single-phase inverter applications.

MIC5235

LDO

5V to 3.3V

AHB

AHO

AHS

ALO

ALI

AHI

μC

5 VDC

BHB BHO BHS

BLO

BLI

BHI

MIC4606-1

MIC2290

5V TO 12V

Boost

3.3 VDC

12 VDC

POWER SWITCHES FROM

INPUT AC TO DC/AC SUPPLY

DURING POWER OUTAGE

OUTPUT AC

BYPASS PATH

INPUT AC

BATTERY

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