1. How Coils Work A basic introduction into Coil technology.

2. Sumida’s Coil Technology Sumida produces and distributes coils and transformer products, based on skilful wire winding technology. Our main customers are in the following industries:  Consumer Electronics  Entertainment Industry  Automotive Electronics  Industrial & Medical Equipment Copyright© 2014 SUMIDA CORPORATION. All rights reserved.

3. What is a Coil ? Coil: A component of an electronic device A coil is called the L element, capacitor C, and resistance R. L, C and R are passive components and play an important role in helping the working of IC and transistor circuits. A coil is a wire wound in a spiral. When a wire is wound, it takes on various characteristics that are different from straight wire. The characteristics are used for various electronic / electric devices and equipment. A Coil is an indispensable component for an electronic device They play an important role to maximize the performance of electronic devices and may greatly affect the performance of products. Sumida designs and develops the best coils for our customers needs. A coil has 5 major functions and is applied to various electronic devices. This presentation will explain 5 function of the coils and the characteristics of our coil technology. L, C and R are passive components Copyright© 2014 SUMIDA CORPORATION. All rights reserved.

4. The 5 Functions of a Coil Self Induction Effect Mutual Induction Effect Resonance Effect Electro- Magnet Effect Electro- Magnetic Induction Effect A Coil has 5 major functions and is applied to various electronic devices. When current flows in the coil, the coil resists the flow. This characteristic is called the self induction effect. Electric power or signal can be transferred between two separate coils. This is known as the mutual induction effect. Combination of a coil (L) and a capacitor (C) generates a resonance effect. When current flows through a coil, a magnetic field is generated and attracts magnetic materials (iron & nickel). This is known as the electromagnetic effect. When a magnet moves through a coil, voltage appears on both ends of the coil. This is known as the electromagnetic induction effect. Copyright© 2014 SUMIDA CORPORATION. All rights reserved.

5. The Self Induction Effect Application of the Self Induction Effect When current flows in the coil, the coil resists the flow. This becomes strongly apparent at higher frequencies. This characteristic is used in the power supply circuit to change alternating current (AC) to direct current (DC). If a rectifier, instead of a coils is used, the output of the rectifier contains a ripple current and is not a complete DC. Application of the Self Induction Effect When current flows in the coil, the coil resists the flow. This becomes strongly apparent at higher frequencies. This characteristic is used in the power supply circuit to change alternating current (AC) to direct current (DC). If a rectifier, instead of a coils is used, the output of the rectifier contains a ripple current and is not a complete DC. The output of a rectifier contains ripple current, and is not a complete DC. inputrectifieroutput Combination of a coil and a capacitor works against AC, and produces stable DC. outputcapacitorcoilinput Self Induction Effect Mutual Induction Effect Resonance Effect Electro- Magnet Effect Electro- Magnetic Induction Effect Copyright© 2014 SUMIDA CORPORATION. All rights reserved.

6. The Mutual Induction Effect Application of the Mutual Induction Effect The Transformer utilizes this effect. The output voltage is determined by the ratio of turns between the primary and secondary coils. Inductance is the measure of the value of a coil. More turns makes larger inductance. Application of the Mutual Induction Effect The Transformer utilizes this effect. The output voltage is determined by the ratio of turns between the primary and secondary coils. Inductance is the measure of the value of a coil. More turns makes larger inductance. Electric power can be transferred between two coils around a core. inputoutput The output voltage is determined by the ratio of turns between the primary and secondary coils. inputoutput voltage Self Induction Effect Mutual Induction Effect Resonance Effect Electro- Magnet Effect Electro- Magnetic Induction Effect Copyright© 2014 SUMIDA CORPORATION. All rights reserved.

7. The Resonance Effect Application of the Resonance Effect A certain frequency of signal is tuned by a resonance effect. The tuning circuit that selects a particular radio station utilizes this effect. Application of the Resonance Effect A certain frequency of signal is tuned by a resonance effect. The tuning circuit that selects a particular radio station utilizes this effect. Combination of a coil (L) and a capacitor (C) generates a resonance effect. (frequency) Resonance Frequency current A certain frequency of signal is tuned by a resonance effect. current (frequency) Resonance Frequency Self Induction Effect Mutual Induction Effect Resonance Effect Electro- Magnet Effect Electro- Magnetic Induction Effect Copyright© 2014 SUMIDA CORPORATION. All rights reserved.

8. The Electromagnet Effect Application of the Electromagnet Effect An electromagnet is applied to various equipment: ABS coils in a car, motors, electromagnetic brakes, buzzers, doorbells, clocks, watches, speakers, earphones, etc… Application of the Electromagnet Effect An electromagnet is applied to various equipment: ABS coils in a car, motors, electromagnetic brakes, buzzers, doorbells, clocks, watches, speakers, earphones, etc… When current flows through a coil, the iron core of a coil becomes an electromagnet. When no current flows through a coil, an electromagnet effect is not generated. Self Induction Effect Mutual Induction Effect Resonance Effect Electro- Magnet Effect Electro- Magnetic Induction Effect Copyright© 2014 SUMIDA CORPORATION. All rights reserved.

9. Application of the Electro-Magnetic Induction Effect When a magnet moves through a coil, voltage appears on both ends of the coil. Microphones and generators utilize this effect. The Electro-Magnetic Induction Effect When a magnet does not move through a coil, current does not flow. When a magnet moves through a coil, induced current flows. Self Induction Effect Mutual Induction Effect Resonance Effect Electro- Magnet Effect Electro- Magnetic Induction Effect Copyright© 2014 SUMIDA CORPORATION. All rights reserved.