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Motor Control Circuit for Cordless Power Tool

Motor driver for cordless power tools using low loss element TPH1R204PB within small package. The motor speed is controlled by MCU. Description of circuit design method.

Circuit diagram of motor control circuit for cordless power tool.
Circuit diagram
Wave form of motor control circuit for cordless power tool.
Wave form

Description

Motor driver for cordless power tools using  low loss element TPH1R204PB within small package. The motor speed is controlled by MCU. Description of circuit design method. 

Features

  • 2 types of drive methods, square wave drive and sine wave drive, are switchable
  • It can control the revolving speed of motor optimally by MCU 
  • TPH1R204PB, that is low power loss and low spike voltage, is used for output elements.
  • 3 shunt type current detector is mounted for PCB, and it can also support sensor-less control. 
  • Protecting function from over current and etc. is mounted. 
  • Standby power reduction circuit operate after a certain period that the motor is not rotating. 
  • It consists of 2 PCBs of a main board and interface board, and contributes to the miniaturization of a power tool.

Reference design files

Design, Document

“Design・Document” contains the documents listed below.

Name Date

Design, File

“Design・File” contains the contents listed below.

Toshiba items

Part Number Device Category Portion Usage Description

CUHS15F40

Schottky barrier diode

Power section・2

VF=0.40 V (typ.) @IF=500 mA

BAS316

Switching diode

Input voltage detector・1

VF=0.715 V (max) @IF=1 mA, IR=30 nA (max) @VR=25 V

2SA2056

PNP Power transistor

Standby power reduction circuit・1

VCEO=-50 V, IC=2 A (DC) , IB=-200 mA

2SC6061

NPN Power transistor

Standby power reduction circuit・1

VCEO=120 V, IC=1 A (DC) , IB=100 mA

TMBT3904

Transistor for LF amplification

Standby power reduction circuit・1

VCEO=50 V, IC=200 mA (DC) , IB=30 mA

TPH1R204PB

N-ch Power MOSFET

Output section・6

QSW=21 nC (typ.) , QOSS=56 nC (typ.) , RDS(ON)=0.85 mΩ (typ.)

TC75W58FK

Comparator

Motor current detector・2

VDD, VSS=7 V , CMVIN=4.1 V (max)

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