Multifunctional over-temperature fusing resistor

Abstract

The invention discloses a multifunctional over-temperature fusing resistor which comprises the components of an energy absorber which absorbs instantaneous energy that is increased in a circuit; a low-temperature fuse wire, electrically connected to the energy absorption body; and a shell, the shell wrapping the energy absorption body, the low-temperature fuse wire and the energy absorption body and being electrically connected with an external circuit. According to the utility model, the anti-lightning surge performance is ensured, the production cost is lower, the size is smaller, the powerconsumption is lower, the shell melting can be effectively avoided during use, and the energy is saved.

Description

technical field [0001] The invention belongs to the field of resistance components and devices, and in particular relates to a multifunctional over-temperature fuse resistor. Background technique [0002] At the moment when the existing switching power supply or capacitor-loaded circuit is connected to the current, the energy stored in the capacitor in the internal circuit is overloaded instantaneously, and the instantaneous current in the circuit will also reach several hundred amps, which will easily lead to bridge piles and capacitors in the circuit. And other electronic components are damaged due to overload, and even cause explosions and fusion shells. [0003] The solution commonly used in the market at present is: add a fuse box or fuse to the circuit, and then absorb it through the varistor to reduce the voltage and current generated when the circuit is turned on, and then enter the capacitor through the bridge stack. However, this solution has the following disadva...

AI Technical Summary

Problems solved by technology

However, this solution has the following disadvantages: due to the characteristics of the thermistor, there is resistance at the moment of power-on, and as its working time increases, its temperature will increase and its resistance will decrease accordingly, which will cause its The voltage division effect will also gradually decrease, and when the thermistor is in a half-short circuit state, its temperature will be very high, resulting in safety hazards such as melting shells

[0004] Another solution on the market is to use a wire-wound fuse instead of a piezoresistor. Because the resistance of the wire-wound fuse is fixed, when it is in a half-short circuit state, the temperature of the wire-wound fuse remains the same. However, at present, the melting point of the wire-wound fuse is relatively high. When the temperature of the wire-wound fuse is high, there will be dangers such as fusion shells; there is also a low-temperature fuse placed inside the wire-wound resistor. The method can perform anti-surge and half-short test, but the production cost is high, and it is necessary to install a bushing to prevent splashing, and at low voltage, according to the power consumption formula P=I*I*R, the power consumption increases with the increase of low-voltage input current increased sharply, reducing the efficiency

Images