2 Outline Linear Power Supply Adjustable power supply Rectifier Circuit Poor man’s cell phone chargerSmall signal resistanceAdjustable power supplyRectifier CircuitHalf-wave rectifier circuitFull-wave rectifier circuitFull-wave rectifier circuit as a Frequency mixerFilter Circuit
3 Outline Large-Signal and Small-Signal Operation Application of Diodes (Up to 3.5.1)
4 c03f19How does a small increase in Vad affect Vout?
14 Small Signal Model of Adaptor c03f25Change in Vad
15 How should a load be modeled? A laptop consumes an average power of 25 W with a supplyvoltage of 3.3 V. Determine the average current drawn fromthe batteries or the adaptor.P=VII= 7.56 AIf the laptop is modeled by a resistor, then RL is Ohms.
16 You Can’t Power a Laptop with a Circuit Like this!
17 How should a Cellphone load be modeled? A cellphone consumes an average power of 100 mW with a supplyvoltage of 2.4 V. Determine the average current drawn fromthe batteries or the adaptor.P=VII= mAIf the cellphone is modeled by a resistor, then RL is 79 Ohms.
18 Use a 79 Ohm Resistor to Model a Cell Phone Load
19 Dual-Output Adjustable Linear Regulated Power Supply
21 Simple DescriptionTransformer: “Downconvert” the AC line voltage to a smaller peak voltage Vm, usually about 2-3 Volts larger than the ultimately desired DC output.Diode Rectifier Circuit: produce a waveform with large DC component.Filter: smooth out the rectified sinusoid.Regulator: eliminate residual ripple
25 c03f31An AC-DC Converter CircuitIdeal Diode Model
26 c03f30 An AC-DC Converter Circuit Constant Voltage Diode ModelIssue: It remains to be seen whether it can provide a current to a load
27 How should a load be modeled? A laptop consumes an average power of 25 W with a supplyvoltage of 3.3 V. Determine the average current drawn fromthe batteries or the adaptor.P=VII= 7.56 AIf the laptop is modeled by a resistor, then RL is Ohms.
28 c03f32 Rectifier Driving a Resistive Load The diode is turned on again ripplesVin begins to fall after t1 because RL providesa discharge path for C1.C1 must be sufficient large so that the currentdrawn by RL does not reduce Vout significantly.
Your consent to our cookies if you continue to use this website.