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Current detection method and device

A current detection device and current detection technology, applied in the field of power electronics, can solve problems such as inaccurate current detection

Active Publication Date: 2013-09-18
VERTIV CORP
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a current detection method and device that can accurately detect the current flowing through the switch tube of the UPS rectifier in view of the above-mentioned inaccurate current detection defect in the prior art

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Embodiment Construction

[0049] Such as Figure 5As shown, in the first embodiment of the current detection method of the present invention, it should first be explained that the opening or closing of the switch tube is controlled by the EPWM signal, that is, when the EPWM signal is at a high level, the switch tube is turned on, and the EPWM signal is at a low level. level, the switch is turned off. During the turn-on time of the switch tube, through Figure 1 to Figure 3 The circuit shown samples, converts and amplifies the current flowing through the switch tube, and sends it to the AD converter. In order to accurately sample the current flowing through the switch tube, the sampling time of the switch tube current must be located in the "best sampling area", that is, the sampling time of the sequence corresponding to the switch tube current sampling of the AD converter must be in the In the "best sampling area". For a certain AD converter, the sampling time of each order is determined, so to make...

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Abstract

The present invention relates to a current detection method and device. The method includes: A. Taking the rising edge of the EPWM signal driving the switch tube as the zero moment, respectively calculating the time tn corresponding to each sequence AD ​​sampling of the M sequence AD ​​converter B. determine the minimum value of the high level duration of the EPWM signal according to the corresponding moment of each sequential AD sampling of the AD converter, the turn-on delay time of the switch tube and the turn-off delay time of the switch tube , and the sequence value of the AD converter corresponding to the sampling moment of the switching tube current when the high level duration of the EPWM signal is the minimum value; C. the sampling of the switching tube current is placed in the high level duration of the EPWM signal as The rank value corresponding to the minimum value. The implementation of the technical solution of the present invention ensures that the current flowing through the switch tube can be accurately detected on the premise of limiting the shortest duration of the high level of the EPWM signal driving the switch tube.

Description

technical field [0001] The present invention relates to power electronics technology, and more specifically, to a current detection method and device. Background technique [0002] At present, current detection devices in the industry generally use current transformers, shunts and Hall devices. Among these devices, high-frequency current transformers are the cheapest. [0003] figure 1 It is the circuit schematic diagram of the rectifier of UPS (Uninterruptible Power Supply, uninterruptible power supply), figure 2 is the current sampling circuit diagram, image 3 is the amplified circuit diagram of the sampling current; combined with figure 1 , figure 2 and image 3 , in the design of the rectifier of small and medium power UPS, high-frequency current transformers CT1 and CT2 are often used to detect the currents of the switch tubes Q1 and Q2 respectively. width modulator) signal to drive. [0004] In the following, only the current transformer CT1 that detects the ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/25
Inventor 卢军刘中伟罗建震吴逊兵刘小刚沈宝山
Owner VERTIV CORP
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