This is circuit of adapter/ regulator 12V that can deliver up to 15 A of current. The common voltage regulator IC 7812(IC1) is used to keep the voltage at steady 12V and three TIP 2599 power transistors in parallel are wired in series pass mode to boost the output current. The 7812 can provide only up to 1A and rest of the current is supplied by the series pass transistors. The 15A bridge B1 does the job of rectifying the stepped down AC input. The capacitor C1, C2 and C3 act as filters. The 1A fuse F1 protects the IC1 from over current in case if the pass transistors fail. The 15A fuse F2 protects the entire circuit (especially the pass transistors) from over current.
With high current transformer, power transistors and high current bridge the circuit is a bit costly and you may try this only if there is a serious need.
Skema Rangkaia Regulator 12 volt 15 ANote:
The T1 can be a 230V AC primary, 18V secondary, 15A type transformer.
The B1 can be a 15A bridge.
If 15A Bridge is not available, make one using four RURG1520CC diodes.
The IC1 and transistors must be mounted on heat sinks.
The B1 can be a 15A bridge.
If 15A Bridge is not available, make one using four RURG1520CC diodes.
The IC1 and transistors must be mounted on heat sinks.
Features IC 78xx
Output current in excess of 1A
Internal thermal overload protection
No external components required
Output transistor safe area protection
Internal short circuit current limit
Available in the aluminum TO-3 package
Gambar IC regulator 7812
Voltage Range IC 78xx
LM7805C 5V
LM7812C 12V
LM7815C 15V
The LM78XX series of three terminal regulators is available with several fixed output voltages making them useful in a wide range of applications. One of these is local on card regulation, eliminating the distribution problems associated with single point regulation. The voltages available allow these regulators to be used in logic systems, instrumentation, HiFi, and other solid state electronic equipment. Although designed primarily as fixed voltage regulators these devices can be used with external components to obtain adjustable voltages and currents.
Considerable effort was expanded to make the LM78XX series of regulators easy to use and minimize the number of external components. It is not necessary to bypass the output, although this does improve transient response. Input bypassing is needed only if the regulator is located far from the filter capacitor of the power supply.
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