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FIGURE 17-11 The waveforms within the switching voltage regulator at the points labeled in Fig. 17-10.
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17.10 VOLTAGE REGULATION
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FIGURE 17-12 An LTC1174CN8-5 switching regulator circuit that will regulate an incoming voltage of 3 to 15 V to 5 V with a maximum current of 100 mA.
Switching voltage regulators are a bit more complex to wire, and, depending on the application and the amount of current required for the robot s electronics, will require more than the four components used in the power supply shown in Fig. 17-12. Even if the LTC1174CN8-4 was to be used in a robot application, you would be well advised to pass the incoming electrical power through a diode and filter the diode s output (and input to the voltage regulator) using a 47 F capacitor or more to ensure that the power would be constant even when there are large voltage transients caused by the motor s changing state. Switching voltage regulators do not cost much more than the zener diode regulator or linear regulators presented in the previous sections; a big part of the cost of the other regulators is the heat sinking and costs of large current components used in them. The switching voltage regulator does not generate a significant amount of heat due to its high operating efficiency and does not need the same expensive packaging or heat sinking of the other solutions.
17.10.4 POWER DISTRIBUTION
You may choose to place all or most of your robot s electronic components on a single board. You can mount the regulator(s) directly on the board. You can also have several smaller boards share one regulator as long as the boards together don t pull power in excess of what the regulator can supply. Fig. 17-13 shows how to distribute the power from a single battery source to many separate circuit boards. The individual regulators provide power for one or two large boards or a half dozen or so smaller ones.
Ilim
3 to 5 V Step-Up Circuit
Sense
BATTERIES AND ROBOT POWER SUPPLIES
Unregulated vdc in
10A slow-blow fuse IN OUT Voltage Regulator 0.1 F GND
To electronics
100 F 0.1 F
Board #1 To electronics IN OUT Voltage Regulator 0.1 F GND
100 F 0.1 F
Board #2
To electronics IN OUT Voltage Regulator 0.1 F GND
100 F 0.1 F
Board #3
FIGURE 17-13 Parallel connection of circuit boards from a single power source. Each board has its own voltage regulator.
17.11 Battery Monitors
Quick! What s the condition of the battery in your robot With a battery monitor, you d know in a flash. A battery monitor continually samples the output voltage of the battery during operation of the robot (the best time to test the battery) and provides a visual or logic output. In this section some of the most common types are described.
17.11.1 4.3 V ZENER BATTERY MONITOR
Fig. 17-14 (refer to the parts list in Table 17-2) shows a simple battery monitor using a 4.3V quarter-watt zener diode. R1 sets the trip point. When in operation, the LED winks off when the voltage drops below the setpoint. To use the monitor, set R1 (which should be a precision potentiometer, 1 or 3 turn) when the batteries in your robot are low. Adjust the pot carefully until the LED just winks off. Recharge the batteries. The LED should now light.
17.11 BATTERY MONITORS
FIGURE 17-14 Battery monitor using 4.3-V zener diode. This circuit is designed to be used with a 12-V battery.
TABLE 17-2 R1 R2, R3 D1 Q1 LED1
Parts List for 4.3-V Zener Battery Monitor 10K potentiometer (see text) 1K resistor 4.3-V zener diode (1 4-W) 2N3904 NPN transistor Light-emitting diode
+5vdc
5 R1 10K 4 5.1 v Zener Diode IC1 339
3 2 12
R2 10K Output
FIGURE 17-15 A zener diode and 339 comparator can be used to construct a fairly accurate 5-V battery monitor.
BATTERIES AND ROBOT POWER SUPPLIES
TABLE 17-3 IC1 R1, R2 D1
Parts List for 339 Comparator Battery Monitor 339 comparator IC 10K resistor 5.1-V zener diode (1 4- or 1 2-W)
Another, more scientific way to adjust R1 is to power the circuit using an adjustable power supply. While watching the voltage output on a meter, set the voltage at the trip point (e.g., for a 12-V robot, set it to about 10 V).
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