Surge protectionequipment and method

Abstract

The invention provides surge protection equipment and method. The equipment comprises an acquisition circuit and a control circuit, wherein the acquisition circuit and the control circuit are connected with a protected circuit; the acquisition circuit is used for acquiring a first current value of the protected circuit in real time and sending the first current value to the control circuit; the control circuit is used for receiving the first current value sent by the acquisition circuit in real time, sending a first PWM control signal to the protected circuit when the first current value of the protected circuit is determined to be greater than a first current threshold value so as to close the PFC, and recording the duration that the first current value is greater than the first current threshold value; and the control circuit is also used for acquiring a second current value of a compressor of the frequency conversion equipment in real time, judging whether the duration is less thanor equal to preset time or not when the second current value is determined to be less than or equal to a second current threshold value, and sending a second PWM control signal to the protected circuit when the duration is less than or equal to the preset time so as to open the PFC. According to the scheme, a surge test level of the frequency conversion equipment can be improved.

Description

technical field [0001] The invention relates to the technical field of electronic engineering, in particular to surge protection equipment and methods. Background technique [0002] With the popularity of frequency conversion equipment, frequency conversion equipment produces large harmonics due to its high power. Therefore, active power factor correction circuits have emerged as the times require, and have become the mainstream solution used by frequency conversion equipment manufacturers to suppress harmonic interference. When using an active power factor correction circuit, due to the characteristics of the air conditioner itself, such as harsh operating environment, wide operating power, and large load fluctuations, how to ensure the reliability of the active power factor correction circuit has become a research focus. Among the protection functions, overcurrent protection is one of the important contents. [0003] The Chinese patent application document with the patent...

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Problems solved by technology

[0004] However, when the surge test is performed, the PFC circuit in the prior art will stop the whole inverter device when performing over-current protection, thus reducing the surge test level of the inverter device.

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