Output overcurrent and short circuit protector for high power contravariant equipment

A short-circuit protection and high-power technology, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the problems of over-current or short-circuit without sufficient protection, no over-current, limited reliability, etc., to save equipment maintenance and repair cost, increased reliability, and increased flexibility

Inactive Publication Date: 2004-01-07
ZTE CORP
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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 (require

Method used

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  • Output overcurrent and short circuit protector for high power contravariant equipment
  • Output overcurrent and short circuit protector for high power contravariant equipment
  • Output overcurrent and short circuit protector for high power contravariant equipment

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Embodiment Construction

[0035] Below in conjunction with accompanying drawing and specific embodiment, the present invention will be further described:

[0036] see figure 1 , figure 2 , the device of the present invention is realized as follows:

[0037] figure 1 The function realized by the output current real-time detection unit 101 in the figure 2 In the output current detection and signal conversion circuit 201, the signal amplification and filter processing circuit 202 are completed, wherein:

[0038] The output current detection and signal conversion circuit 201 converts the output current into a voltage signal that is convenient for processing, accurately and without time delay (or very small time delay, negligible) in proportion. In order to meet the use under different output current conditions, the ratio of the conversion circuit is selected according to the actual protection range. It is advisable to select the ratio of the converted output signal that can make full use of the monit...

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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...

Claims

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Application Information

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IPC IPC(8): H02H7/122
Inventor 张南山贺川汪广武
Owner ZTE CORP
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