Output overcurrent and short circuit protector for high power contravariant equipment

Abstract

An output overcurrent short circuit protection device for a high power contravarient equipment relates to AC inverse power source protection field including output current real time detecting unit, analog signal digitalized unit, software judgement current step control and protection unit, transient excess-current impulse judgement unit, excess-current protection and automatic restoring unit after overshoot, continuous excess current or short protection unit. This invention can finish excess-current or output short protection for large power inverse output equipment.

Description

technical field [0001] The invention relates to the protection field of AC inverter power supply, in particular to a protection technology when a high-power (greater than 1kW) inverter equipment outputs overcurrent and output short circuit. Background technique [0002] Many electronic products and electronic equipment systems often face output overcurrent or short circuit phenomena during work. If there are no corresponding protection measures, the result will be partial or complete damage to the system, especially in high-power electronic output equipment. Once output overcurrent occurs Or short-circuit, the power tube will be damaged at the slightest, and the equipment will be completely destroyed at the worst, and even cause casualties and other property losses. Therefore, it is of great significance to take safe and reliable over-current and short-circuit protection measures for high-power electronic output devices. [0003] In the technical field of microelectronic cir...

AI Technical Summary

Problems solved by technology

[0007] For example, the Chinese patent 96117751 "Circuit for avoiding instantaneous short circuit of the upper and lower power tubes of the inverter" proposes a protection method for instantaneous short circuit of the key device inside the system - the switch tube, which is proposed according to the principle requirements of the system and the working characteristics of the power device The solution does not have sufficient protection for the overcurrent or short circuit of the system or equipment, and the protection for the inverter output equipment is incomplete;

[0008] 3) There is no function of automatic recovery immediately after the output is normal during overcurrent protection (requires computer control to recover)

[0010] 1) There is no single inverter cycle instantaneous current monitoring and protection function;

[0011] 2) There is no function of automatic recovery immediately after the overcurrent disappears;

[0012] 3) Failure to make protection and short circuit judgments for continuous overcurrent of multiple inverter cycles;

[0013] 4) There is no gradable current control function and gradable setting over-current protection measures, and the system cannot set multi-level over-current protection points

[0014] 5) The hardware protection control and software protection are not effectively combined to achieve double protection, and the reliability of protection is limited

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