23.08.2015

12v dc power adapter radio shack

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The schematic diagram below shows a simple trivial low-cost 12 volt DC 50W off-line SMPS switching power supply circuit. The unit has overcurrent, overtemperature and overvoltage protections, as well as passive inrush current limiting. To safely test or troubleshoot this circuit it is recommended to power it via an isolation transformer or from an isolated AC source. This AC to DC power supply utilizes a flyback, which is the simplest SMPS converter topology.
The initial start-up current for the PWM IC is provided by "bleeding" resistors R7, R8 that allow small current which charges the Vcc capacitor C7.


The secondary side feedback control loop uses a TL431 precision shunt regulator D1 as both the reference and an error amplifier. Thermal switch shuts down the power supply when temperature on the MOSFET heatsink exceeds 95-100 oC. Packaging should be the same as what is found in a retail store, unless the item is handmade or was packaged by the manufacturer in non-retail packaging, such as an unprinted box or plastic bag.
Import charges previously quoted are subject to change if you increase you maximum bid amount. If you have questions about other products or if you need personalized guidance in finding a solution for your wireless needs, please contact us. Also note that an offline single-transistor flyback converter generates internal voltages which may reach 600 V. This current sense voltage is applied through a spike filter to the current sense terminal of U3, where it is compared against the scaled down error signal at compensation pin 1. Note that a flyback transformer operates as an inductor: it accumulates energy in the magnetic field during ON period of Q1. If you reside in an EU member state besides UK, import VAT on this purchase is not recoverable. If you have a question that hasn't been answered below, you may submit a new question and 3Gstore will answer it! If you need to get lower ripple, you may put an additional output capacitor or an LC filter outside of the feedback loop. Don't try to play with this circuit unless you are of a legal age, understand power electronics and know how to deal safely with high voltage. The input section includes a fuse, EMI filter, inrush current limiting NTC resistor R1, a full bridge rectifier CR1, and a DC bus filter capacitor C2. When Q1 turns on, the DC bus voltage is applied across the transformer T1 primary winding, current through the transformer primary ramps up and energy is accumulated in the transformer's magnetic field.


An optocoupler U1 feeds the current proportional to the error signal across the transformer galvanic isolation boundary back to the primary PWM. This project is a modification of a 24V circuit that I've designed many years ago as a consultant for a small company.
If accurate regulation of the output is not required, the feedback can be taken from the bias voltage at C9 and fed via a divider into feedback pin 2. In order to store energy efficiently with minimal physical size, a non-magnetic gap is needed in series with a high permeability magnetic core material. That company wanted a plug-in replacement to a cheap off-the-shelf AC to DC power supply, which had a long lead time. When Q1 turns off, the energy stored in the magnetic field causes the voltages across all winding to reverse polarity. Flyback transformer design usually uses ferrite cores with a physical gap, or powdered metal cores with an inherently present distributed gap.
By the time I've completed the design and built a proto, they found the off-the-shelf part elsewhere in stock. As a result, output rectifiers D4 and D7 conduct and the stored energy is transferred to the output and to the bias circuit.
Once the converter is started, the bias for the control PWM comes from the bias winding of the transformer.
But you are not allowed to republish the content of this page anywhere or use it for commercial purposes without my permission. All coils in this design have to be made of wire with two or more layers of Teflon insulation to assure reinforced insulation between primary and secondary.



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