Otis Singleton
In electrical engineering, power conversion is the process of converting electric energy from one form to another. This conversion can be from direct current (DC) to alternating current (AC) or vice versa, or it can be a change in voltage or frequency of the current. Power converters are electrical circuits that enable this conversion, acting as a link between the power source and the power supply output. They are essential when travelling between countries with different mains power voltages, such as the 120 V in North America vs. the 230 V in Europe, and for powering devices that require a different voltage or current than what is supplied by the mains or batteries.
| Characteristics | Values |
|---|---|
| Definition | An electrical circuit that changes the electric energy from one form into the desired form |
| Types | AC to DC, AC to AC, DC to DC, and DC to AC |
| Use cases | Consumer electronics, household appliances, medical equipment, aerospace industry, transportation systems, voltage conversion when travelling between countries |
| Components | Transformers, inductors, capacitors, semiconductor switches, rectifiers, oscillators, step-up transformers, transistors, PWM switching |
| Voltage range | 100-250 V |
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What You'll Learn
AC to DC converters
In electrical engineering, power conversion is the process of converting electric energy from one form to another. A power converter is an electrical circuit that changes the electric energy from one form into the desired form. A power converter can be a simple device such as a transformer or a more complex one like a resonant converter.
An AC-DC converter is a device that converts an AC voltage to a DC voltage. The electricity supplied to homes is typically 100V or 200V AC, while most electronic devices operate at 3.3V or 5V DC. Therefore, an AC-DC converter is necessary to convert the voltage supplied to homes to the voltage required by electronic devices. AC-DC converters can also be used to replace car batteries, taking 110V or 220V AC power from a wall outlet and converting it to 12V DC power.
There are several types of AC-DC converters, including the rectifier, which converts AC to DC, and the cycloconverter or frequency changer, which converts AC to AC. AC-DC converters use non-linear components such as semiconductor switches and linear reactive components such as inductors, transformers, and capacitors for intermediate energy storage and current and voltage filtering. The size, weight, and cost of an AC-DC converter are largely determined by these components.
Some examples of AC-DC converters include the DF-1763 Universal 110/220 Volt AC to 12V DC Power Converter, 10 Amps, and the DF-1765 Universal AC to DC Converter Output 12V-13.8V DC, 20 Amp. These converters can be used to convert wall power to DC power for use in battery-powered equipment, eliminating the need for batteries.
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DC to AC converters
In electrical engineering, power conversion is the process of converting electric energy from one form to another. A power converter is an electrical device that transforms electrical energy between alternating current (AC) and direct current (DC). It can also change the voltage or frequency of the current.
There are several types of DC to AC converters available, including stand-alone, car power, and commercial three-phase power inverters. These converters can be designed to produce pure sine wave or modified sine wave power outputs. The choice between these options depends on the specific requirements of the devices or appliances that will be powered.
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DC to DC converters
In electrical engineering, power conversion is the process of converting electric energy from one form to another. A power converter is an electrical circuit that changes the electric energy from one form into the desired form.
There are several types of DC to DC converters, each suited for different applications. The most common types include simple DC-to-DC converters that operate by dissipating excess voltage as heat to maintain a constant output voltage. They are known for their simplicity, low noise output, and fast response to changes in load. However, they are inefficient for large differences between input and output voltages because they waste a lot of power as heat.
Another type of DC to DC converter is the switching converter or switched-mode DC-to-DC converter, which can increase or decrease voltage. These converters store the input energy temporarily and then release it to the output at a different voltage. The storage may be in magnetic field storage components (inductors, transformers) or electric field storage components (capacitors). Switching converters are often more power-efficient (with typical efficiency between 75% and 98%) than linear voltage regulation, which dissipates unwanted power as heat.
Isolated DC to DC converters use a transformer to provide isolation, multiple outputs, different voltage levels, or polarity. The commonly used types include the full bridge, half bridge, forward, and push-pull converters, which are the isolated versions of the buck, boost, and buck-boost converters.
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Transformers
In electrical engineering, power conversion is the process of converting electric energy from one form to another. A power converter is an electrical device that converts electrical energy between alternating current (AC) and direct current (DC). It can also change the voltage or frequency of the current.
The basic components of a transformer are two separate coils of wire wound around a single core. The coil connected to the incoming or voltage source is the primary coil, and the coil connected to the outgoing or voltage output is the secondary coil. The primary and secondary windings are built from stranded copper and are insulated from each other. The core is an electromagnetic device that impedes (limits) or amplifies (increases) voltage flow according to output requirements. It is made from either silicone steel or soft iron.
The primary coil receives the voltage and becomes energized, which magnetizes the core. This induces the voltage in the secondary coil, creating a push and pull on the free electrons and making them move. The secondary coil then turns the electromagnetic flow back into electrical power at the necessary output voltage required. The transformer core enhances the magnetic coupling between the primary and secondary circuits. It provides a controlled pathway for magnetic flux through the transformer from the primary windings to the secondary windings.
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Voltage converters
In electrical engineering, power conversion is the process of converting electric energy from one form to another. A power converter is an electrical device that converts electrical energy between alternating current (AC) and direct current (DC). It can also change the voltage or frequency of the current.
A voltage converter, also known as a power converter or voltage transformer, is an electric power conversion device used to change the electrical output of a power source. The most common use for these converters is to change the voltage from 220 volts to 110 volts or vice versa. This is often necessary when travelling between countries with different mains power voltages, such as North America (120 volts) and Europe (230 volts).
Step-down voltage converters are used to reduce the voltage from 220, 230, or 240 volts to 110 volts, allowing the use of 110-volt electronics and appliances in countries with higher voltage power supplies. Similarly, step-up voltage converters are used to increase the voltage from 100 to 220 volts. Some step-up converters can also work as step-down converters, making them suitable for use in both types of power supply systems.
The size of a voltage converter is defined by its wattage, which should be based on the wattage requirements of the devices to be powered. It is recommended to choose a voltage converter with a wattage that is 2 to 3 times higher than the appliance's rating to ensure proper functioning and prevent damage to the converter. Certain appliances, such as power tools, motors, laser printers, and TVs, may require a converter with even higher wattage due to their higher power demands.
DC to DC converters are a type of voltage converter that specifically deals with direct current (DC) electrical power. They convert DC power from one voltage level to another, ensuring compatibility between the voltage supplied by batteries or power supplies and the voltage required by electronic components or circuits. These converters are commonly used in computer power supplies, board-level power conversion, DC motor control circuits, and other applications.
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Frequently asked questions
A power converter is an electrical circuit that changes electric energy from one form into another. It can convert alternating current (AC) to direct current (DC) and vice versa, as well as change the voltage or frequency of the current.
Power converters include simple devices such as transformers, and more complex ones like resonant converters. Examples of power converters in use include the AC to DC conversion in household appliances like refrigerators and computers, and the DC to AC conversion in battery-powered devices like cell phones and flashlights.
AC and DC are two different forms of electric current. AC constantly reverses direction, creating a pulsating flow of electricity, while DC flows steadily in one direction. Converting between the two is important because different devices are designed to use one form or the other. For example, household appliances typically use AC, while devices like cell phones and flashlights use DC.
A voltage converter is a type of power converter that specifically changes the voltage of an electrical power source. It can be used to allow appliances designed for one geographical region's mains voltage to operate in an area with a different voltage.
