PPTC circuit-protection devices are used to protect against harmful over current surges and over-temperature faults. Like traditional fuses, these limit the flow of dangerously high current during fault conditions. The PPTC device, however, automatically resets after the fault is cleared and power to the circuit is removed. Understanding the precise nature of these devices can help designers develop more reliable equipment and reduce warranty, service and repair costs. Improvements in size, cost and performance have resulted in wide spread ....etc

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EDDY CURRENT BRAKES

EDDY CURRENT:
It is a swirling current set up in a conductor in response to a changing magnetic field.
By Lenz's law, the current swirls in such a way as to create a magnetic field opposing the change

Eddy Current Brakes
It slow an object by creating eddy currents through emi which create resistance, and in turn either heat or electricity.
Braking action is made by varying the strength of the magnetic field.
¢ A braking force is possible when electric current is passed ....etc

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RESETTABLE FUSE

Electrical fuse

Various fuses
¢ Thermal fuse
¢ Resettale fuse



Resettable fuse (PPTC)
Positive polymeric temperature coefficient


INTRODUCTION
Ablity to handle higher current and voltage
PPTC effect,secure protection
Current rating

MANUFACTURE

PPTC consist of multiple top and bottom layer, made of non crystalline organic polymer with conducting materials, ....etc

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RESETTABLE FUSE

Electrical fuse

Various fuses
¢ Thermal fuse
¢ Resettale fuse



Resettable fuse (PPTC)
Positive polymeric temperature coefficient


INTRODUCTION
Ablity to handle higher current and voltage
PPTC effect,secure protection
Current rating

MANUFACTURE

PPTC consist of multiple top and bottom layer, made of non crystalline organic polymer with conducting materials, ....etc

[:=Read Full Message Here=:]

EDDY CURRENT BRAKES

EDDY CURRENT:
It is a swirling current set up in a conductor in response to a changing magnetic field.
By Lenz's law, the current swirls in such a way as to create a magnetic field opposing the change

Eddy Current Brakes
It slow an object by creating eddy currents through emi which create resistance, and in turn either heat or electricity.
Braking action is made by varying the strength of the magnetic field.
¢ A braking force is possible when electric current is passed ....etc

[:=Read Full Message Here=:]

Poly Fuse

Polyfuse is a new standard for circuit protection. It is resettable. Many manufacturers also call it polyswitch or multifuse. Polyfuses are not fuses but polymeric positive temperature co-efficient (PPTC) thermistors.

Current limiting can be accomplished by using resistors , fuses , switches or positive temperature co-efficient devices. Resistors are rarely an acceptable solution because the high power resistors that are usually required are expensive. One-shot fuses can be used, but they might fatigue, and they must be replaced ....etc

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Lithium ion cells packaged in aluminium cans continue to be the highest performing cells in the market. Circuit protection for rechargeable lithium-based battery cells and packs in a critical design consideration. overcurrent and overtemperature conduction that can result from accidental shorting or abusive/runaway charging can raise temperature high enough to damage components and cause substantial damage. This paper presents the use of PPTC devices for short-circuit and overcharge of battery packs. Polymeric positive temperature coefficient [ ....etc

[:=Read Full Message Here=:]

Lithium ion cells packaged in aluminium cans continue to be the highest performing cells in the market. Circuit protection for rechargeable lithium-based battery cells and packs in a critical design consideration.

overcurrent and overtemperature conduction that can result from accidental shorting or abusive/runaway charging can raise temperature high enough to damage components and cause substantial damage.

This paper presents the use of PPTC devices for short-circuit ....etc

[:=Read Full Message Here=:]

Poly Fuse

Polyfuse is a new standard for circuit protection. It is resettable. Many manufacturers also call it polyswitch or multifuse. Polyfuses are not fuses but polymeric positive temperature co-efficient (PPTC) thermistors.

Current limiting can be accomplished by using resistors , fuses , switches or positive temperature co-efficient devices. Resistors are rarely an acceptable solution because the high power resistors that are usually required are expensive. One-shot fuses can be used, but they might fatigue, and they must be replaced ....etc

[:=Read Full Message Here=:]

Lithium ion cells packaged in aluminium cans continue to be the highest performing cells in the market. Circuit protection for rechargeable lithium-based battery cells and packs in a critical design consideration. overcurrent and overtemperature conduction that can result from accidental shorting or abusive/runaway charging can raise temperature high enough to damage components and cause substantial damage. This paper presents the use of PPTC devices for short-circuit and overcharge of battery packs. Polymeric positive temperature coefficient [ ....etc

[:=Read Full Message Here=:]

PPTC circuit-protection devices are used to protect against harmful over current surges and over-temperature faults. Like traditional fuses, these limit the flow of dangerously high current during fault conditions. The PPTC device, however, automatically resets after the fault is cleared and power to the circuit is removed. Understanding the precise nature of these devices can help designers develop more reliable equipment and reduce warranty, service and repair costs. Improvements in size, cost and performance have resulted in wide spread acce ....etc

[:=Read Full Message Here=:]