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FIGURE 17-9 Three-terminal linear voltage regulators, like the 7805, can be used to provide stable voltages for battery-powered robots. The capacitors help filter (smooth out) the voltage.
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Parts List for +5-V Battery Regulator 7805 linear voltage regulator 100 F electrolytic capacitor 0.1 F capacitor (any type)
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Here are some other linear regulators that you may be interested in:
The 328K provides an adjustable output to 5 V, with a maximum current of 5 A (amperes). The 78H05K offers a 5-V output at 5 A. The 78H12K offers a 12-V output at 5 A. The 78P05K delivers 5 V at 10 A.
An important point to note about linear voltage regulators is their dropout voltage, or the minimum voltage that must be provided to operate properly. For the 7800 series, you should provide a minimum of 3 V more than they are rated at. So for a 7805, 8 V or more must be provided to the chip to get 5 V out. This dropout is effectively a voltage drop within the chip. For an 8 V input to the 7805, 37.5 percent of the power passed to the chip will be dissipated as heat; better than the zener diode regulator, but still a significant amount of power loss. If you were to look around, you will find linear regulator chips with much smaller dropout voltages, which will minimize the power lost significantly.
17.10.3 SWITCHING VOLTAGE REGULATION
The regulators described in the previous two sections are not very efficient; they reduce the input voltage in some way, which means they have to dissipate the resulting power lost in the regulator. The switching voltage regulator (more accurately called the switch mode power supply, also known by its acronym SMPS) has much higher operating efficiencies and can be configured to raise the incoming voltage or produce a negative voltage output. The basic circuit for a switching voltage regulator is shown in Fig. 17-10 with its operating waveform shown in Fig. 17-11. This circuit is designed to raise the input voltage from 3 to 5 V by loading and unloading an inductor (or coil) and passing the high voltage to a diode and a filter capacitor. When the transistor attached to the coil is turned off, the coil reacts by producing a large voltage that passes some current through the diode to the load circuit. The VCO, or voltage controlled oscillator, controls the rate at which the inductor s transistor is turned on and off to ensure the voltage is regulated reasonably well. The design of the VCO and the specification of the transistor switching waveform are fairly complex (although not as complex as you might think many simple microcontrollers on the market can monitor the output voltage and calculate a new transistor switching waveform quite easily). Fortunately, there are a lot of controller chips, such as the
BATTERIES AND ROBOT POWER SUPPLIES
Switch Control
Load "R"
Vout
FIGURE 17-10 A basic switching voltage regulator that will produce a 5 V output from 3 V in.
LTC1174CN8-5, shown in Fig. 17-12. This chip will take a voltage from 3 to 15 V and produce a regulated 5 V output with an efficiency well over 90 percent. The wide input voltage range is part of the advantage of using a switching voltage regulator for robot applications in which a single battery is used for driving the motors as well as the electronics. The switching voltage regulator will produce a remarkably constant output voltage despite the varying input voltage caused by the robot s motors starting, stopping, or stalling. When specifying the circuit to be used in your robot, the nominal voltage output of the batteries while the motors are running should be used.
C Ground (0 Volts)
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