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birt code 39

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An FET works something like a semiconductor implementation of a relay An FET has two leads, known as the source and the drain, connected to a channel of semiconductor material The composition of the material is such that current cannot normally flow through it A third lead, called the gate, is connected to a conductive electrode that lies on top of the semiconductor junction but is insulated from it by a thin non-conducting layer When voltage is applied to the third electrode, it creates an electric field that rearranges the electrons in the semiconductor junction With the field present, current is able to flow between the source and drain pins When the gate is driven to a low voltage, the electric field reverses and current is unable to flow The FET acts as a voltage-controlled switch, where an applied voltage to the gate will control the current flow between the drain and source The layer of insulation between the gate and the source/drain channel must be very thin for sufficient field strength to reach from the gate into the semiconductor channel This thinness makes the FET vulnerable to being damaged by too high a voltage If the voltage between either the drain or source and the gate exceeds the breakdown voltage of the insulation layer, it will punch a hole through the layer and short the gate to the motor or battery circuit This can be caused by connecting the FET up to too high a voltage, or simply by zapping the FET circuit with static electricity You should be careful when handling FETs and attached electronics to avoid accidentally discharging static electricity into them It is also good practice to use FETs with a voltage rating of twice the battery voltage you wish to run your motors on to avoid the possibility of inductive spikes momentarily exceeding the FET breakdown rating When using an FET as a high-current PWM switch, it is important that you switch the gate from the off voltage to the on voltage as quickly as possible When at an intermediary state, the FET will act as a resistor, conducting current inefficiently and generating heat Commercial PWM FET-based controllers use specialized high-current driver chips to slam the FET gates from low to high voltage and back as quickly as possible, minimizing the time spent in the lousy intermediary state The power that can be switched by an FET is fundamentally limited by heat buildup Even when fully in the on state, an FET has a slight resistance Heat buildup in the FET is proportional to the resistance of the semiconductor channel times the square of the current flowing through it The resistance of the semiconductor channel increases with its temperature so once an FET begins to overheat, its efficiency will drop; and if the heat cannot be sufficiently carried away by the environment, it will generate more and more heat until it self-destructs This is known as thermal runaway A FET s power-switching capacity can be improved by removing.

Figure 6-45 The Decomposition Tree allows for easy cross-drilling, which allows users to drill from one dimension to another

Voice Announce: Knowing who is calling is the most important criteria in call management By knowing who is calling, one can decide the priority and nature of the call before taking action Positive Caller Identification enables us to know who is calling, allowing us to manage and prioritize calls Callers can be identified by various methods: o Matching the Automatic Number Identification with a database or personal information manager (PIM) o Having the caller speak their name o Having the caller input their telephone or account number prior to transferring the call Follow-me: Regardless of where you may be, you can be available to take that important call Call Management enables you to take calls you want when you want them If an important customer calls your office while you are traveling, they will be identified by the Call Management system and your Virtual Assistant will try to locate you by calling previously programmed telephone numbers in the Call Management system You may have designated your cellular telephone as your primary call-back choice Your cellular telephone rings, you answer, and your Virtual Assistant says, You have a call from (caller s voice plays) Would you like to take the call At this point, you can take the call, elect to send it to voice mail, or reroute to another associate You can even choose to play one of many pre-recorded greetings to the caller

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