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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.
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.
Design, File
“Design・File” contains the contents listed below.
Toshiba items
| Part Number | Device Category | Portion Usage | Description |
|---|---|---|---|
Schottky barrier diode |
Power section・2 |
VF=0.40 V (typ.) @IF=500 mA |
|
Switching diode |
Input voltage detector・1 |
VF=0.715 V (max) @IF=1 mA, IR=30 nA (max) @VR=25 V |
|
PNP Power transistor |
Standby power reduction circuit・1 |
VCEO=-50 V, IC=2 A (DC) , IB=-200 mA |
|
NPN Power transistor |
Standby power reduction circuit・1 |
VCEO=120 V, IC=1 A (DC) , IB=100 mA |
|
Transistor for LF amplification |
Standby power reduction circuit・1 |
VCEO=50 V, IC=200 mA (DC) , IB=30 mA |
|
N-ch Power MOSFET |
Output section・6 |
QSW=21 nC (typ.) , QOSS=56 nC (typ.) , RDS(ON)=0.85 mΩ (typ.) |
|
Comparator |
Motor current detector・2 |
VDD, VSS=7 V , CMVIN=4.1 V (max) |
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