IC-SP-06027 R0
1-2. Single-chip Inverter ICs
Hitachi Single-chip Inverter ICs are monolithic ICs integrating various constituent devices and circuits required for
inverter control on a single chip with dielectric isolation technology. They are for driving motors, best suited for
controlling small three-phase brushless DC motors. The advantage of downsizing by the use of a single-chip structure
can be used to reduce the control board in size, which facilitates the incorporate of such ICs in motors.
(Can be incorporated in motors.)
Logic
Level Shift
Control Circuit
IGBT
Driver
IGBT
(Single-chip inverter IC)
Fig. 1-2. Single-chip inverter IC
1-3. Composition of an inverter IC
An inverter is a device that converts DC currents into AC. It can be used to drive motors for efficient variable-speed
control. Fig. 1-3 shows the basic configuration of an inverter IC required for that purpose. To drive the three-phase
motor with an inverter, six IGBTs and free wheel diodes are used as output stages. The IC consists of an IGBT driving
power circuit, level shift circuit, a logic circuit and other components for IGBT control. Hitachi Inverter ICs can directly
receive high voltage supplied from rectifying commercial AC power, because they have high dielectric strength. This
obviates the need of a step-down circuit, thus inhibiting efficiency cuts induced by voltage conversion.
High voltage 3-phase DCBLM Driver IC
Output Power device: IGBTs
U
Rectifying/smoothing
Charge pump
circuit
Driver circuit
Protection circuit
Level shift circuit
Logic circuit
V
W
circuit
AC115
V
15V
Motor
m-Processor
Position detection
circuit
Fig.1-3. Basic configuration of an inverter IC
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