Power electronics converters can be found wherever there is a need to change voltage, current of frequency of electric power. The power range of these converters is forming some mill watts (as in mobile phone) to thousands of megawatts in an HVDC transmission system. With classical electronics, electrical currents, and voltage are used to carry information, where as with power electronics, they carry power electronics becomes the efficiency
An inverter converts DC to AC, and also changes voltages. In other words, it is a power adopter. It allows a battery – based system to run conversional AC appliances director through conventional home wiring. There are ways to use DC directly, but for a modern lifestyle you will need an inverter for the vast majority if not all your loads in electrical terms loads are devices that use electrical energy.
A power inverter, or inverter, is an electrical power converter that changes direct current (DC) to alternating current AC) the converted AC can bet any required voltage and frequency with the use of appropriate transformer switching and control circuits. II. Title of the study
III. Statement of the problem
IV. Theoretical framework
V. Scope and limitation
DC- AC inverter only design for the purpose of emergency. If inverts 12v D>C to 220 volts AC. It is capable of inverting voltage can be used in emergency operation. It can only operate to incandescent lamp, electric fan for the emergency use.
VI. Significance of the study
This significance of the study is stated as follows:
1. The students will study to lead to an improved implementation of the electrical curriculum since the study focuses on the variables contributory to the implementation of this program. 2. The faculty needs of the teacher respondents will be discovered and based on the findings, this development programs can be designed to address teachers needs. 3. Administrative users benefits will be afforded to students since problems in the implementation of electrical will be identified and strategies can be employed to equip teachers with better teaching tools. 4. School administrators can work forwards relevant to electrical curriculum particularly on acquiring additional tools/ equipment that will cater to electrical needs.
VII. Definition of terms
The following terms are defined operationally and conceptually to give understanding about the study and the system. * Alternating current – is an electrical current that frequently reverses direction. AC electricity is measured according to its cycles, with one complete cycle being counted each time a given current travels in one direction and then doubles back on itself. An electrical current is able to complete many cycles per second, and is then given its frequency rating based on that number; for example, the typical frequency in North America is 60 hertz (Hz), which indicates that the current is performing 60 cycles per second. AC power is the type of electricity most commonly used in homes and offices, and is extremely versatile because its voltage can be changed through a transformer to suit a variety of transmission needs.
* Direct current – is a type of electrical current that travels through a circuit in only one direction. Direct current is the type of electrical power that is produced by fuel cells, batteries, and generators equipped with commutates. While DC power was the first type of electricity to be commercially transmitted, it has been widely replaced by alternating current (AC) electricity, and is now used primarily in electrochemical and metal-plating applications. * Transformer – a device which converts electrical power alternating current to different voltage. In this device both primary and secondary windings are usually stationary, and are wound on a common magnet core. We used step-up transformer so convert 12 volts DC to 220...
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