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Electric Screwdriver
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Overview
Electric screwdrivers are becoming more compact and portable cordless battery-charged models are becoming mainstream. Brushless DC (direct current) motors are increasingly being used to meet these demands. Since a brushless DC motor does not have to worry about brush wear, the motor can have a longer lifespan and is capable of highly precise rotation control. Moreover, brushless DC motors are also highly efficient and economical. Since there is little electrical loss, little heat is generated, making brushless DC motors well suited for continuous operation. More compact device size is another advantage. Renesas offers digitally controlled microcontroller power supplies for charger control meeting a variety of battery specifications. They are optimal for use in the battery charger unit.
The Renesas R8C Family and RL78/G14 microcontrollers are suitable for use in motor control applications in electric screwdrivers. These microcontrollers feature low power consumption, which makes possible increased energy savings and more compact electric screwdrivers, contributing to longer battery life and making them an eco-friendly solution. Renesas also offers comprehensive solutions for electric drivers in the form of the R8C/3x Series, which is suitable as the microcontroller for the charger, and highly efficient power MOSFETs for motor drive inverter and charger control.
System Block Diagram
Recommended Products
| Block | Semiconductor device | Recommended products | Features, etc. |
|---|---|---|---|
| Motor control MCU | MCU | RL78/G14 | 3-phase PWM timer and R8C peripheral functions on-chip |
| R8C Family | Three-phase PWM timer, 5V operation, small package | ||
| Reset | RNA519xx Series | 3V, 5V reset | |
| Charger control MCU | MCU | RL78/G14 | PWM timer and R8C peripheral functions on-chip |
| R8C Family | Three-phase PWM timer, 5V operation, small package | ||
| Reset | RNA519xx Series | 3V, 5V reset | |
| Sensor output | Op-amp | HA1630 Series | General-purpose CMOS op-amp, comparator |
| HA1631 Series | |||
| General use, surge absorption, circuit protection, etc. | Zener diode | RKZxxKG Series | 2-terminal face-mount outline High ESD tolerance optimal for use in surge absorption |
| HZMxNB Series | 3-terminal (1 device included) face-mount outline High ESD tolerance optimal for use in surge absorption | ||
| Switching diode | HSU119/HSC119 | 2-terminal face-mount outline | |
| HSM2838C, HSM123 | 3-terminal (2 devices included) face-mount outline | ||
| Schottky barrier diode | HRC0103C | 2-terminal face-mount outline (low VF and low leak current) | |
| HRB0502A | 3-terminal face-mount outline (low VF) | ||
| HRV103B, RKR104BKH, other | 2-terminal face-mount small outline (Io = 1A) Low IR optimal for use in circuit protection | ||
| Inverter | MOS FET | RJK10xxDPN Series | Low on-resistance or low gate capacitance |
| MCU peripheral | Sensor signal amplification CMOS op-amp | HA1630xxx Series | Low power consumption |
| Reset IC | RNA51957 | Variable detection voltage | |
| Power element of charger | MOS FET | RJK40xxDPE | Low on-resistance, small package |
| IGBT Gate Drive | Photocoupler | PS9305 series PS9505 series | High Isolation Voltage ( 5kVr.m.s.) High Output Current (2.5A) High CMR (25kV) |
| PS9306 series PS9506 series | High Isolation Voltage ( 5kVr.m.s.) Output Current (0.6A) High CMR (25kV) |
Related Application Notes/Sample Code
| Title | Document No. |
|---|---|
| R2A20114 Application Note | - |
| R2A20108 Application Note | - |
| R2A20117 Application Note | - |
| R2A20112 Application Note | - |
| R2A20121 Application Note | - |
| Power MOS FET Application Note | REJ05G0001-0200 |
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