Datasheet > THP4752

THP4752

更新时间： 2022-05-20 16:48:40

品牌	Logo	应用领域
其他 - ETC		电机
页数	文件大小	规格书
8页	262K
描述
脉宽调制专用集戍电路,THP4752 是一种用于交流电机调速的专用大规模集成电路

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THP4752 数据手册

Philips Semiconductors

Product speciﬁcation

HEF4752V

LSI

A.C. motor control circuit

Furthermore, the HEF4752V contains all logic circuitry

required for this special waveform generation, so that the

amount of control circuit components is reduced

considerable. The speed drive system in Fig.2 is controlled

by the analogue control section.

The FCT and VCT clock pulse oscillators are driven in

such a way, that a fast response speed control of the a.c.

motor is obtained, depending on: the reference values for

speed; motor voltage; motor current (Limited by the

measured motor current via DCCT - d.c. current

transformer -); the increasing value of V_Cbduring braking

action.

APPLICATION INFORMATION

Figure 2 shows the functional block diagram of a 3-phase

a.c. motor speed control system using a thyristorized

inverter with variable frequency output. The inverter

control signals are generated by the HEF4752V

(PWM-IC). A special feature of the PWM (Pulse-Width

Modulation) - IC is here, that the motor is supplied by

sinoidally modulated pulses, hence the resulting motor

current will approach a sine-wave with a minimum on

higher harmonics. In this way, an optimum speed drive

with high performance is obtained.

Fig.2 PWM motor speed control system using HEF4752V.

January 1995

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