Resettable fuse type self-protective overvoltage/overcurrent protection device
A self-resetting fuse, overvoltage and overcurrent protection technology, applied in emergency protection circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, electrical components, etc., can solve thermal breakdown, varistor temperature High, limited and other problems, to achieve the effect of solving the protection too slow or even no protection
Inactive Publication Date: 2012-04-04
溧阳杰敏电子有限公司
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Problems solved by technology
The zinc oxide varistor absorbs energy when it is turned on, and its temperature rises rapidly. Therefore, the energy that the varistor can absorb when it is turned on is limited. If the energy is too large, the temperature of the varistor will be too high and thermal breakdown will fail.
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[0015] Below in conjunction with accompanying drawing and specific embodiment the technical scheme is further described as follows:
[0016] A self-recovery fuse type self-protection type overvoltage and overcurrent protection device, including a varistor, a ceramic PTC thermistor, a self-recovery fuse and an encapsulation coating; the two ends of the varistor are respectively connected to the ceramic PTC thermal One end of the sensitive resistor and one end of the self-recovery fuse; one end of the ceramic PTC thermistor that is not connected with the varistor is connected with a lead wire; one end of the self-recovery fuse that is not connected with the varistor is connected with a lead wire; One end of the varistor connected to the resettable fuse is connected with a lead wire; the encapsulating paint is coated on the surface of the varistor, the ceramic PTC thermistor and the resettable fuse, and only the lead wire is exposed.
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A resettable fuse type self-protective overvoltage / overcurrent protection device comprises a piezoresistor, a ceramic PTC (Positive Temperature Coefficient) thermistor, a resettable fuse and a sealing coating, wherein the two ends of the piezoresistor are connected to one end of the ceramic PTC thermistor and one end of the resettable fuse through conducting layers, respectively; the end of the ceramic PTC thermistor which is not connected with the piezoresistor is connected to a lead; the end of the resettable fuse which is not connected with the piezoresistor is connected to a lead; the end of the piezoresistor which is connected with the resettable fuse is connected to a lead; and the sealing coating is applied to the surfaces of the piezoresistor, the ceramic PTC thermistor and the resettable fuse with only the leads exposed. The technical proposal improves the reliability of the zinc oxide piezoresistor and avoids voltage-sensitive effectiveness loss due to long-term overvoltage; besides, the resettable fuse type self-protective overvoltage / overcurrent protection device solves the problem of the voltage-sensitive effectiveness loss of the conventional overvoltage / overcurrent protection device due to too slow protection of the resettable fuse, and overcomes the shortcomings of two slow protection and even no protection of the resettable fuse in low-temperature environments.
Description
technical field [0001] The technical solution belongs to the technical field of electronic devices, in particular to a self-protection type overvoltage and overcurrent protection device. Background technique [0002] Zinc oxide varistors have nonlinear volt-ampere characteristics, and are generally used in electronic circuits as anti-overvoltage and anti-lightning protection devices. When the voltage is lower than the working voltage value of the varistor, the resistance of the varistor is extremely high, almost open circuit, so it will not affect the normal operation of the device or electrical equipment. When the voltage is momentarily higher than a certain value, the resistance of the varistor drops rapidly, conducts a large current, and clamps the voltage within the voltage range that the protected device or electrical equipment can withstand to protect the protected device or electrical equipment. The zinc oxide varistor absorbs energy when it is turned on, and its tem...
Claims
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IPC IPC(8): H02H9/02H02H9/04
Inventor 漆光智王峰
Owner 溧阳杰敏电子有限公司
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