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Devices for Measuring Chopped Current

A technology of chopping current and measuring circuits, applied in the direction of measuring current/voltage, only measuring current, measuring electrical variables, etc., can solve the problems of depending on the duty cycle and not being long enough to allow the transformer to demagnetize

Active Publication Date: 2019-01-08
VALEO SYST DE CONTROLE MOTEUR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this period depends on the duty cycle and may not be long enough to allow demagnetization of the transformer

Method used

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  • Devices for Measuring Chopped Current
  • Devices for Measuring Chopped Current
  • Devices for Measuring Chopped Current

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0072] The invention relates to a device 1 for measuring a chopping current, in particular a chopping current flowing inside a DC-DC converter 3 .

[0073] converter

[0074] refer to figure 1 , the represented converter 3 has an H-bridge structure with a first branch B 1 and the second branch B 2 .

[0075] first branch B 1 including the first switch Mos 1 and the second switch Mos 2 .

[0076] second branch B 2 including the first switch Mos 3 and the second switch Mos 4 .

[0077] As a non-limiting example, switch Mos 1 to Mos 4 These include N-type field effect transistors, known simply as MOSFETs.

[0078] When controlling the first branch B 1 , when the second switch Mos 2 When blocked, the first switch Mos 1 is turned on, and conversely, when the first switch Mos 1 When blocked, the second switch Mos 2 is turned on.

[0079] The same applies for controlling the second branch B 2 , when the second switch Mos 4 When blocked, the first switch Mos 3 ...

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PUM

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Abstract

The invention relates to a device for measuring a chopping current capable of flowing in an electric circuit having an H-bridge structure comprising a first and a second branch. The apparatus comprises: two transformers, each connected to a branch, the transformers comprising: a primary circuit and a secondary circuit configured for passing a chopping current; and two demagnetizing circuits; and two measuring circuits, respectively connected to To the terminals of the secondary circuit of the associated transformer, the measuring circuit respectively comprises: at least one unit comprising a first switch and a second switch connected in opposite directions, both switches being respectively implemented by a transistor. The measurement circuit comprises a common measurement resistor connected to ground via a first terminal and connected to the source of the first transistor of the first measurement circuit and the source of the first transistor of the second measurement circuit via a second terminal.

Description

technical field [0001] The invention relates to a device for measuring chopping current. Background technique [0002] Such a measuring device is particularly useful for measuring the chopping current flowing to the input of a DC-DC converter. [0003] Such measuring devices may include pulse transformers. A transformer includes a primary circuit through which a chopping current flows, and a secondary circuit through which an output current proportional to the chopping current flows. The secondary circuit of the transformer includes two output terminals, between which a circuit for measuring the output current is connected. The measurement circuit typically includes resistors. [0004] Sometimes it is necessary to measure a chopping current with a non-zero average value, for example for measuring the chopping current flowing in a DC-DC converter connecting two supply batteries of different voltages. [0005] Therefore, the pulse transformer must be demagnetized regularly...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/18
CPCG01R15/183G01R19/20H02M1/0009H02M3/33573G01R19/0046G01R19/0092
Inventor P.萨达特M.莫罗
Owner VALEO SYST DE CONTROLE MOTEUR