Chapter E –Transistors and H-Bridges

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Presentation transcript:

Chapter E –Transistors and H-Bridges

Semiconductors Conductors – semiconductors – insulators Impurities P-type N-type

Diodes

Bipolar Junction Transistors This is WRONG! 

MOSFET OPERATION

Important MOSFET parameters Maximum Voltage VDS Maximum current IDS Turn-on voltage VGS On resistance RDS

H-Bridge concept

H-Bridge Implementation 1

H-Bridge Implementation 2

H-Bridge Implementation 3

H-Bridge Implementation 4 L9110 Dual-Channel H-Bridge Motor Driver Module - Dual L9110S chipset motor driver - Input voltage: 2.5V~12V - Current: 800mA

Distance Sensor: GP2Y0A21 IR sensor operating voltage: 4.5 V to 5.5 V average current consumption: 30 mA (typical) distance measuring range: 10 cm to 80 cm (4" to 32") output type: analog voltage output voltage differential over distance range: 1.9 V (typical) response time: 38 ± 10 ms

Distance Sensor: HC-SR04 Ultrasonic sensor Working Voltage: DC 5V Working Current: 15mA Working Frequency: 40Hz Max Range: 4m Min Range: 2cm Measuring Angle: 15 degree Trigger Input Signal: 10µS TTL pulse

Distance measurement Emit 10 microsecond pulse. Measure delay for return signal. Twice distance is speed of sound x delay Speed of sound = 34 cm /millisecond = 13.4 inches / ms So distance (in) = delay (ms) *6.7