Resettable fuse type self protection overvoltage overcurrent protection circuit
A self-recovery fuse, overvoltage and overcurrent protection technology, applied in the direction of emergency protection circuit devices, emergency protection circuit devices, circuit devices, etc. for limiting overcurrent/overvoltage, can solve the problem of high temperature, limited, and Thermal breakdown and other issues
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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[0016] Below in conjunction with accompanying drawing and specific embodiment the technical scheme is further described as follows:
[0017] A self-recovery fuse type self-protection type overvoltage and overcurrent protection circuit, including a varistor, a ceramic PTC thermistor, a self-recovery fuse and a protected circuit; after the self-recovery fuse is connected in series with the protected circuit, it is connected with the The resistance formed by the series connection of the varistor and the ceramic PTC thermistor is connected in parallel; the varistor and the resettable fuse have a common connection end.
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The invention relates to a resettable fuse type self protection overvoltage overcurrent protection circuit, which comprises a voltage sensitive resistor, a ceramic PTC thermal sensitive resistor, a resettable fuse and a protected circuit; the resettable fuse is connected in series with the protected circuit and then is connected in parallel with a resistor formed in a manner that the voltage sensitive resistor is connected in series with the ceramic PTC thermal sensitive resistor; and the voltage sensitive resistor and the resettable fuse have a common connecting end. The technical scheme has the effects that: the reliability of the zinc oxide voltage sensitive resistor is improved and the voltage sensitive failure caused by longtime overvoltage is avoided; the problem on the voltage sensitive failure caused by too slow protection of the resettable fuse on the conventional overvoltage overcurrent protection device is solved; and the defect on too slow protection and even non protection of the resettable fuse on the conventional overvoltage overcurrent protection device in low temperature environment is solved.
Description
technical field [0001] The technical proposal belongs to the technical field of electronic circuits, in particular to a self-restoring fuse type self-protection overvoltage and overcurrent protection circuit. 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...
Claims
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IPC IPC(8): H02H9/04H02H9/02
Inventor 漆光智王峰
Owner 溧阳杰敏电子有限公司