Resettable fuse type overvoltage and overcurrent protection circuit

A self-recovery fuse, overvoltage and overcurrent protection technology, applied in emergency protection circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, circuit devices, etc., can solve thermal breakdown, varistor temperature High, limited and other problems, to solve the effect of slow protection or even no protection
CN102437562AInactive Publication Date: 2012-05-02溧阳杰敏电子有限公司
0 Cites 1 Cited by

Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
溧阳杰敏电子有限公司
Publication Date
2012-05-02
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
Patent Text Reader

Abstract

The invention discloses a resettable fuse type overvoltage and overcurrent protection circuit, comprising a piezoresistor, a PTC (Positive Temperature Coefficient) ceramic thermistor, a resettable fuse and a protected circuit, wherein the protected circuit is connected with a resistor, formed by connecting the piezoresistor and the PTC ceramic thermistor in series, in parallel and then is connected with the resettable fuse in series; and the piezoresistor and the resettable fuse comprise a common connecting end. The technical scheme provided by the invention has the advantages of increasing the reliability of a zinc oxide piezoresistor so as to prevent a voltage-sensitive failure due to long-term overvoltage, solving the problem of the voltage-sensitive failure of a conventional overvoltage and overcurrent protection device due to over-low protection speed of the resettable fuse, and overcoming the defects that the resettable fuse is slow in protection and unavailable for protection in a low-temperature environment.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The technical proposal belongs to the technical field of electronic circuits, in particular to a self-restoring fuse type 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 is turned on, and i...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More