Overvoltage and overcurrent protection element and overvoltage and overcurrent protection circuit

Abstract

The invention discloses an overvoltage and overcurrent protection element. The element is a resistance random storage unit having a two-end structure, when the voltages at the two ends of the element are beyond certain values, the resistance value is rapidly converted into a low resistance value from a high resistance value or is rapidly converted into the high resistance value to the low resistance value, by utilizing the characteristic that the resistance value is rapidly converted into the low resistance value from the high resistance value when the voltages at the two ends of the element are beyond certain values, the element and a load are correlated to achieve overvoltage protection of the load, and by the characteristic that the resistance value is rapidly converted into the high resistance value from the low resistance value when the voltages at the two ends of the element are beyond certain values, the element and a load are connected in series to achieve overcurrent protection of the load. Since the resistance conversion speed of a RRAM (Resistance Random Access Memory) device can reach nanosecond (ns), even picoseconds (ps), the conversion voltage can be controlled by a process, and the overvoltage and overcurrent protection element has the characteristics of a simple structure, fast protection speed, high resistance value, reversibility and the like, and is a very ideal overvoltage and overcurrent protection element.

Description

technical field [0001] The invention relates to the technical field of load and circuit protection, in particular to an overvoltage and overcurrent protection element and an overvoltage and overcurrent protection circuit. Background technique [0002] Electronic components are mainly devices made of semiconductors, which are the main body of electronic circuits, and each electronic component has a nominal maximum withstand voltage (V max ) and the maximum withstand current (I max ), therefore, when the current flowing through the component exceeds the maximum withstand current (overcurrent) or the voltage on the loaded device exceeds the maximum withstand voltage (overvoltage), the device will have varying degrees of damage, severe direct breakdown or burnout . In actual circuit applications, the short-circuit current is usually relatively large, and high pulse surge voltage often exists. Therefore, it is very important to prevent overvoltage and overcurrent problems of el...

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Problems solved by technology

Additionally, in addition to the device's V max and I max In addition, the response speed and leakage current of the device are also important parameters. If the protection device does not respond in time, the protected device will still be damaged

The above two circuit protection technologies are still the mainstream overvoltage and overcurrent protection technologies in circuit design, and they are widely used. However, in some precision applications, the response speed is not enough. The fastest Zener diode is usually on the order of nanoseconds

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