Novel frequency conversion power source protecting device

Abstract

A protective device for a variable-frequency power supply comprises a power resistor, a relay and a negative temperature coefficient thermistor, wherein the power resistor and the negative temperature coefficient thermistor are connected in series between the power supply and an integrated circuit; the relay is connected in parallel with the power resistor and both ends of the negative temperature coefficient thermistor; and a capacitor is connected in parallel with the integrated circuit. The invention includes the resistor satisfying the requirements of a rectification circuit, thereby effectively preventing overvoltage and overcurrent, protecting the capacitor and shortening the charge time.

Description

Technical field [0001] The invention belongs to the field of electrical engineering, and relates to a power supply protection device, in particular a variable frequency power supply protection device. Background technique [0002] With the increasing development of electronic technology, variable frequency power supplies have been widely used, and variable frequency power protection devices have also been valued. However, currently commonly used variable frequency power protection devices (such as figure 1 Shown) Only composed of power resistor 11 and relay 12, most of them have the problem that the charging current of capacitor 14 is still large at the beginning of power-on; as the voltage of capacitor 14 increases, the charging current of capacitor 14 gradually decreases, making the charging time longer. . [0003] Again from figure 2 It can be seen that the choice of resistance has different effects on the rectifier circuit: [0004] 1) At the initial stage of capacitor charging...

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Problems solved by technology

[0002] With the development of electronic technology, variable frequency power supply has been widely used, and the protection device of variable frequency power supply has also attracted much attention. figure 1 As shown) is only composed of a power resistor 11 and a relay 12, most of which have problems such as that the charging current of the capacitor 14 is still relatively large at the initial stage of power-on; as the voltage of the capacitor 14 increases, the charging current of the capacitor 14 gradually decreases, making the charging time longer and other problems

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