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Copy of Power PWM driver with voltage controlled current source - on Sun, 01/17/2021 - 19:44

stracoma_1
Designer222022

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Description

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 calculated

1.5. 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. OTHER

3.1. 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 kHz

2. PWM Duty Cycle: from 5 % to 95 %

3. Current: from 5/10 mA DC to 1000/2000 mA DC

4. 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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Copy of AC-DC Power Adapter - on Thu, 11/19/2020 - 13:06

vladimir.jug
Designer236538

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3 years 5 months

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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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Copy of AC-DC Power Adapter - on Thu, 11/19/2020 - 08:39

oblik2004
Designer236629

oblik2004

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3 years 4 months

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