HIP4082EVAL【PDF 1/13 页】EVAL BOARD FET DRIVER HIP4082

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A DC-AC Isolated Battery Inverter

Using the HIP4082

Application Note

February 2003

AN9611.1

Author: George E. Danz

WARNING

The HIP4082EVAL DC-AC Inverter contains HIGH

VOLTAGE and is a potential shock hazard. USE

CARE when DC power is connected.

Introduction

The advent of the personal computer (PC), has created the

need for uninterruptible power supplies to insulate

computers from line dips and temporary outages that plague

PC reliability. In addition, numerous other applications exist

for DC to AC inverters including small tools or accessories

from a DC battery source in automobiles. There is a need,

too, for providing battery backup in the telephone industry for

20Hz ring generators.

The HIP4082 DC/AC Evaluation Board (subsequently

referred to as the “eval-board”) featuring the HIP4082 is one

way to increase the performance, while reducing cost of DC

to AC conversion. The topology chosen uses the HIP4082 to

provide a 60kHz, low voltage, square-wave to drive a small

isolation power transformer. The output of this transformer is

rectified, filtered, and the high voltage inverted again to

produce the desired low frequency (55Hz) output waveform.

(55Hz was chosen as a compromise between the 50Hz and

60Hz power standards.) A variable duty-cycle quasi-square-

wave output waveform was chosen over a sinusoidal

waveform for simplicity and cost-effectiveness. The 60kHz

frequency of the primary-side inverter minimizes cost

and size of the transformer, while the square-wave

output waveform minimizes the size of the secondary-side

rectifier filter.

Designers will provide modifications necessary to customize

the Evaluation Board for their specific applications.

HIP4082 Features

The combined features of the HIP4082 make it ideal for

Uninterruptible Power Supply (UPS), motor control, full

bridge power supply and switching power amplifier

applications. Switching power amplifier applications utilize

switching frequencies up to 200kHz.

The HIP4082 is an 80V N-Channel MOSFET Driver IC that

independently drives four N-Channel MOSFETs in a full

H-Bridge configuration. Whereas the HIP4082 is very similar

to the HIP4081A MOSFET driver, it is different in the

following important ways:

? The HIP4082 peak output drive current is 1.25A, which

reduces the need for adding series gate resistors when

driving medium to large MOSFETs.

? Only one delay time setting resistor is needed to adjust

dead-time when using the HIP4082. Proper dead-time

adjustment avoids simultaneous MOSFET conduction

when switching from an upper MOSFET to a lower

MOSFET or vice-versa. It is the time period between turn-

off of an upper MOSFET gate, to turn-on of a lower

MOSFET gate and vice versa.

? The HIP4082 incorporates no charge pump, further

reducing size and cost. The dead-time setting resistor

connected between the DEL and V SS pins provides

possible dead-time settings from 0.1 μ s to 4.5 μ s thereby

extending the dead-time range provided by the HIP4080A

and HIP4081A ICs.

? The HIP4082 provides continuous on/off level-shift drive

signals for the upper MOSFETs. This eliminates concerns

that some users, particularly from the UPS industry, have

regarding poorer noise immunity of latched on/off upper

MOSFET gate control. Continuous on/off level-shift drive

signals for the upper MOSFETs results in slightly greater

power dissipation than latched gate drives. When an

upper MOSFET is turned off the common (phase)

connection between upper and lower MOSFETs falls

almost immediately to the ground potential, reducing the

voltage impressed across the level-shift transistor. Level-

shift power becomes significant only when an upper

MOSFET body diode current maintains the AHS and BHS

pins at the high voltage rail potential. This situation arises

only when freewheeling current keeps one of the upper

MOSFET body diodes conducting even though the gate

command for that MOSFET is off. This can happen when

a user directs freewheeling current to conduct in the upper

two bridge switches. It is better to direct all freewheeling

currents to flow in the lower two MOSFETs or their

associated body diodes, and minimize level-shift power

dissipation within the HIP4082. The level-shift power when

utilizing bottom circulation (freewheeling) is the product of

the level-shift current and the relatively low V DD (12V)

potential (not the high voltage bus potential).

? The HIP4082 is packaged in compact, 16 pin PDIP and

narrow body SOIC packages.

Design Summary

This DC-AC Inverter design presents one approach to

regulating the output voltage, protecting the inverter from

overcurrents and reducing output voltage when benign

overcurrents would tend to cause the system to overheat. A

neon light even warns users of high voltage when the unit is

energized.

The eval-board design shows how easy it is to design

inverters using the HIP4082. The eval-board is not the only

answer to UPS or portable battery inverter implementation.

The eval-board includes two inverters. The primary inverter

uses the HIP4082 to convert the 12V battery potential to

approximately 160V DC through transformer isolation. The

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc.

All other trademarks mentioned are the property of their respective owners.

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