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overcurrent protection device

An overcurrent protection and current technology, applied in the direction of current response resistors, resistors with positive temperature coefficient, etc., can solve the problem of large difference in operating time, and achieve the effect of small operating current variation and reduced operating time.

Active Publication Date: 2016-12-14
LITTELFUSE ELECTRONICS (SHANGHAI) CO LTD
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  • Abstract
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Problems solved by technology

This will cause a large difference in the operating time corresponding to the same fault current (which is usually the operating current that enables the PTC thermistor to automatically shut down)

Method used

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Embodiment Construction

[0027] The making and using of the embodiments are discussed in detail below. It should be understood, however, that the specific embodiments discussed are merely illustrative of specific ways to make and use the invention, and do not limit the scope of the invention.

[0028] figure 1 A block diagram of an overcurrent protection device 100 according to an embodiment of the present invention is shown. The overcurrent protection device 100 includes a thermistor 101 and a current heating unit 102, wherein:

[0029] The thermistor 101 includes a thermosensitive material with a positive temperature coefficient characteristic;

[0030] The current heating unit 102 is connected in series with the thermistor 101 and heats the thermistor 101 through heat conduction.

[0031] Specifically, when the overcurrent protection device 100 is connected to a circuit, the current flowing through the current heating unit 102 will cause the current heating unit 102 to generate heat and conduct ...

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Abstract

The present invention provides an overcurrent protection device, comprising: a thermistor, which includes a heat-sensitive material with a positive temperature coefficient; a current heating unit, which is connected in series with the thermistor, and conducts heat to the thermistor The thermistor is heated. Compared with traditional overcurrent protection devices, the action time of the overcurrent protection device of the present invention is significantly reduced, especially when the overcurrent protection device works at a small operating current, the reduction in action time is particularly obvious. In addition, since the auxiliary current heating unit can heat the thermistor with a substantially stable heating efficiency, the influence of the ambient temperature on the thermistor is reduced, which enables the overcurrent protection device of the present invention to operate in a larger temperature range The operating current within the range of change is small.

Description

technical field [0001] The present invention relates to the technical field of electronic devices, and more specifically, the present invention relates to an overcurrent protection device. Background technique [0002] A thermistor is a resistor whose resistance value changes with temperature. According to different temperature coefficients, thermistors are usually divided into positive temperature coefficient (Positive Temperature Coefficient, PTC) thermistors and negative temperature coefficient (Negative Temperature Coefficient, NTC) thermistors. PTC thermistors increase in resistance as the temperature increases, while NTC thermistors decrease in resistance as the temperature increases. [0003] Specifically, the positive temperature coefficient characteristic of the PTC thermistor means that when the temperature rises above the Curie temperature point (or transition temperature point), the resistance value of the PTC thermistor will increase geometrically; When the te...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01C7/02H01C7/13
Inventor 董湧郭涛马歇尔·R·威廉斯尼尔·H·舒尔特西丽克特·曼里拉
Owner LITTELFUSE ELECTRONICS (SHANGHAI) CO LTD
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