| 摘要 |
<p>AÂ power-tool control system comprises a programmable microcontroller 10 having an output 101 for driving a motor 12 of a power tool and a selection device 14 to provide an input signal to the microcontroller 10. The selection device has plural states, each representing a different type of power tool, and for each state the microcontroller provides a respective set of output signals to the motor. The micro-controller can comprise an input 102 for detecting different types of battery and can supply a different output signal to the motor depending on the type of battery and, should it detect a LI-ion battery can measure the state of charge of the battery. The microcontroller can also comprise an output 104 connected to a status display 16.; and inputs 105, 106 receiving user alterable selections of economy/sport mode and speed. A shunt 20 can provide current feedback through an operational amplifier 107 to the microcontroller which can vary the current according to the motor load. The selection device 14 can be a header that is connected during manufacture in a configuration that selects a pre-programmed operational program for driving the motor that is appropriate to the tool type, such as a grass trimmer, leaf blower or a hedge trimmer.</p> |
