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.

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.

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

Design Documents

Design Documents contain the documents below.

Design Data

Design Data contains the contents listed below.

*1:Actual PCB was designed on CR5000BD. The other files were made from CR5000BD file.

*2:The data was generated on CR5000BD.

Used Toshiba Items

Part Number Device Category Portion Usage Description
Small-signal Schottky barrier diode Power section・2 40 V/1.5 A Schottky Barrier Diode, SOD-323HE(US2H)
Switching diode Input voltage detector・1 100 V/0.25 A Switching diode, SOD-323(USC)
Power transistor for high-speed switching applications Standby power reduction circuit・1 PNP Bipolar Transistor, -50 V, -2 A, TSM
Power transistor for high-speed switching applications Standby power reduction circuit・1 NPN Bipolar Transistor, 120 V, 1.0 A, TSM
Transistor for low frequency small-signal amplification Standby power reduction circuit・1 NPN Bipolar Transistor, 50 V, 0.2 A, SOT-23(SOT23)
Power MOSFET (N-ch single 30V<VDSS≤60V) Output section・6 N-ch MOSFET, 40 V, 0.0012 Ω@10V, SOP Advance, U-MOSⅨ-H
Comparator (CMOS) Motor current detector・2 Dual Comparator (CMOS), 7 V, +/-3.5 V, SOT-765(US8)

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