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Copy of AC-DC Power Adapter - on Wed, 01/29/2020 - 12:05

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This is a circuit design for a typical wall-plug power adapter.The sinusoidal source represents a typical US 60 Hz, 120V AC wall supply.A transformer steps the voltage down to a manageable range to be rectified for a 5V DC supply, but the waveform is still sinusoidal.The 4 diode bridge rectifier takes this lower amplitude sinusoidal signal and produces a DC biased result, but still with noise resulting from the rectification process.The capacitor before the voltage regulator chip helps smooth some of this noise. Then the regulator chip provides a self-contained, feedback controlled mechanism to keep the output voltage at the specified value.The output capacitor further smooths any output ripple and provides a reservoir of charge to supply any surge in current load that may be encountered.This example includes a load resistor that allows the exploration of the effects of load. The load is varied during the simulation and it can be seen that above a load of 100 mA, the regulation of the output voltage begins to deteriorate.The addition of a few components can make it possible for such a circuit to provide significantly higher power loads. See http://www.systemvision.com/design/ac-dc-power-adapter-current-boost-regulator for an example.

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Power Auto on/off

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Power Auto on/off

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AC-DC Power Adapter

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Description

This is a circuit design for a typical wall-plug power adapter. The sinusoidal source represents a typical US 60 Hz, 120V AC wall supply. A transformer steps the voltage down to a manageable range to be rectified for a 5V DC supply, but the waveform is still sinusoidal. The 4 diode bridge rectifier takes this lower amplitude sinusoidal signal and produces a DC biased result, but still with noise resulting from the rectification process.The capacitor before the voltage regulator chip helps smooth some of this noise. Then the regulator chip provides a self-contained, feedback controlled mechanism to keep the output voltage at the specified value. The output capacitor further smooths any output ripple and provides a reservoir of charge to supply any surge in current load that may be encountered.This example includes a load resistor that allows the exploration of the effects of load. The load is varied during the simulation and it can be seen that above a load of 100 mA, the regulation of the output voltage begins to deteriorate.The addition of a few components can make it possible for such a circuit to provide significantly higher power loads. See http://www.systemvision.com/design/ac-dc-power-adapter-current-boost-regulator for an example.

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Automatic Diesel Genarator Power Transfer

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Power PWM driver with voltage controlled current source

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Power PWM driver with voltage controlled current source for driving/suppling pulse transformer.Pulse transformer parameters:1. INPUT COIL:1.1. fi wire enamelled winding = 0,35 mm (from pulse transformer datasheet)1.2. wire enamelled winding length = 0,400 m = 400 mm (calculated)1.3. N = 2 x 12 scrolls (from pulse transformer datasheet)1.4. R = 0,11 Ohms (parallel 2 x 0,22 Ohms) (measured and/equal calculated1.5. H = 47,52 uH (from pulse transformer datasheet)1.6. U = 3,5 - 15 V DC (from pulse transformer datasheet)2. OUTPUT COIL:2.1. fi wire enamelled winding = 0,15 mm (from pulse transformer datasheet)2.2. N = 1 x 300 scrolls (from pulse transformer datasheet)2.3. R = 10,6 Ohms (measured)2.4. U = 400 V DC (after diode one-half rectifier and C filter) (from pulse transformer datasheet)3. OTHER3.1. voltage insulation test at 1 kV (from pulse transformer datasheet)3.2. dedicated frequency 33 kHz (from pulse transformer datasheet)3.3. recommended driver IC ON Semiconductor MC34063 (1.5 A, Step-Up/Down/Inverting Switching Regulators) (from pulse transformer datasheet)Parameters to reach:1. PWM frequency: from 1 kHz to 75/100 kHz2. PWM Duty Cycle: from 5 % to 95 %3. Current: from 5/10 mA DC to 1000/2000 mA DC4. PWM control voltage: from 0 V DC to 3.0 V DC or from 0 V DC to 3.3 V DC (whatever for now)5. Current source voltage: from 0.1 V DC to +3.3/5.0 V DC

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Maximum power transfer

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AC-DC Power Adapter fixed

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AC-DC Power Adapter noisy

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