What Is a Power Semiconductor?
Sanken Electric is a manufacturer specialized in power electronics and power semiconductors.
Power electronics is to drive electronic devices efficiently and very accurately by control and conversion of electric power.
The term refers to both technologies and products that involve two overlapping fields of "power" and "electronics".
The applications are found in a diverse array of industries ranging from home appliances and audio visual equipment,
to automobiles which are increasingly becoming electrified.
The key device in power electronics is the power semiconductor.
Power Electronics in Our Everyday Lives
Electricity Generated at a Power Station Cannot be Used as Is
Hundreds of thousands of volts of electricity generated at power stations are converted into 100 V and/or 200 V * alternating
currents (AC) by substations and supplied to households, offices, facilities, and other destinations. These currents are,
however, unable to run home appliances and office automation equipment as is. For instance, TVs and air conditioners consist of microcontrollers
and other electronic components which run at 3 V or 5 V direct current (DC). Power semiconductors installed in the power supplies of various equipment convert the electricity delivered to the outlet in the form of 100 V or 200 V AC currents into DC currents, which is then converted into the voltage required by each equipment.
* Voltage varies by country.
What Is a Power Semiconductor?
Power semiconductors control motors, lighting systems and other convert electric power.Their characteristic lies in that they handle high voltages and large currents.
LSIs such as microcomputers and memories are well-known semiconductors. These are designed to perform computations and memorization tasks, while power semiconductors control power supplies (electric power) and provide power to run motors, charge batteries, or run microcomputers and LSIs by converting AC to DC, reducing voltage to an appropriate operating level such as 5 V or 3 V.
■ Tasks Performed by Power Semiconductors
■ Main Types of Power Semiconductors
Sanken Electric's power semiconductors are mainly categorized into three types. The effects and features of these power semiconductors are shown below.
Diodes One-way Flow (Rectification), Yet with a Wide Range of Applications
Electricity flows from high voltage (+) to
low voltage (-), just like water.
For instance, prepare two electric wires, place a
diode and an electric bulb halfway up each wire, and
connect these wires to batteries, as shown in the
illustration on the right. In the case of ❶, electricity
flows through the wire and the bulb lights up. In
the case of ❷, however, no electricity flows
through the wire.
This is because the diode is a semiconductor
which serves like a tap valve that allows electricity
to flow in only one direction.
Its real task is "rectification", converting AC to DC. Diodes designed for this purpose are called rectifier diodes (rectifier elements). Currents supplied to households are AC currents. However, DC currents are required to run electronic equipment circuits, and it is the rectifier diodes that convert AC to DC.
Sanken Electric manufactures various diodes, from rectification and high speed switching types, to compact Schottky diodes with a small voltage drop.
Transistors Carry Heavy Loads with Three Legs (Amplification & Switches)
Transistors are elements which are the basis of electronic circuits. They perform amplification and switching operations. Amplification is to convert a small amount of electricity to a large amount of electricity. For example, amplification is the process of turning a small sound from earphones into a loud sound that can be heard on speakers. Switching is the act of turning ON and OFF large currents and high-voltage electricity with only a small amount of electric power, and is used to drive display screens and to run motors, etc. MOSFETs and IGBTs are also a type of transistors.
Sanken Electric has long experience in manufacturing a range of transistors, such as those used in audio and industrial equipment, providing its customers with safer solutions.
Integrated Circuits (ICs) A Single Chip Performing Multiple Tasks
Integrated circuits (ICs) combine many diodes, transistors, and other circuit elements onto a single silicon chip. When a large number of diodes, transistors, and other circuit elements are placed on a single silicon chip, they are called large-scale integrated circuits (LSIs). These circuits perform rectification, amplification, memorization tasks, arithmetic operations, etc.
Sanken Electric offers various ICs for a broad range of applications, such as power management ICs, motor drivers, and LED drivers.
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