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Hybrid circuit protection tech capable of 30A hold currents, 100A max

Posted: 15 Nov 2010 ?? ?Print Version ?Bookmark and Share

Keywords:Li-ion? hybrid circuit protection? MHP?

Tyco Electronics introduced its Metal Hybrid PPTC (MHP) technology, useful for high-rate-discharge battery applications at ratings above 30VDC/30A. MHP technology utilizes a new hybrid circuit protection design which merges a bimetal protector in parallel with a polymeric positive temperature coefficient (PPTC) device, offering resettable overcurrent protection.

This integrated solution offers resettable overcurrent protection and utilizes the low resistance of the PPTC device to help prevent arcing in the bimetal protector at higher currents, at the same time heating the bimetal, keeping it open and in a latched position.

With the advances in lithium ion (Li-ion) technology, a rapidly growing market for high-rate-discharge Li-ion battery applications has created the need for cost-effective, robust circuit protection devices that help ensure battery safety in end-products. Currently, however, few protection solutions address high-rate-discharge battery applications and traditional circuit protection techniques tend to be large, complex and/or expensive. In response, MHP technology offers a cost-effective, space-saving option which conventional circuit protection approaches are unable to deliver.

The initial device in a planned family of MHP devices, the MHP30-36, has a 36VDC/100A maximum rating and a time-to-trip of under five seconds at 100A (at 25C). The device's hold current is 30A and the initial resistance is under 2m. This brings excellent arc suppression characteristics compared with standard breaker devices which must limit the number of switching cycles (since arcing between contacts may damage them).

The MHP30-36 device can also help reduce the number of discharge FETs and accompanying heat sinks in applications that usually use IC-plus-FET battery protection designs.

The MHP device technology may be configured for various applications; higher voltage (up to 400VDC) and hold current (60A) devices are now in development. Future design considerations consists of battery protection in Li-ion battery packs used in e-scooters and light electric vehicles (LEVs), as well as standby-power applications and non-battery applications such as electric motor protection.

Samples are now available for Model MHP30-36-T (30A, 36VDC).

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