A method of detecting load current

A load current and voltage technology, applied in the direction of measuring current/voltage, measuring electrical variables, measuring devices, etc., can solve the problem of large load current detection error

Active Publication Date: 2021-05-04
SOUTHCHIP SEMICON TECH SHANGHAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for detecting load current, which mainly solves the problem of large detection error of existing load current existing in the prior art

Method used

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  • A method of detecting load current
  • A method of detecting load current
  • A method of detecting load current

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Embodiment

[0023] Such as Figure 1 to Figure 7 As shown, a method for detecting load current includes a control circuit for detecting load current, the control circuit includes a comparator, a logic control circuit connected to the COMP_OUT terminal of the comparator, and a signal generation circuit connected to the Step_Down_Ctrl pin of the logic control circuit , a signal generation circuit connected to the logic control circuits EN_Shut_Down and EN_Step_Down and an isolation tube grid control circuit, a gate driver connected to the isolation tube grid control circuit, an external isolation tube connected to the grid and the isolation tube grid control circuit, One end is connected to the drain of the external isolation tube, the other end is grounded and the capacitor C is connected to the external load, connected to the positive input of the comparator and passed the threshold voltage VS0-ΔV0 of the set voltage threshold, and connected to the comparator at the same time through the s...

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Abstract

The invention discloses a method for detecting load current, which mainly solves the problem of large detection error of the existing load current in the prior art. The detection method includes (S1) connecting a threshold voltage VS0-ΔV0 with a voltage threshold at the positive input terminal of the comparator, and simultaneously connecting the VS voltage of the voltage on the detection capacitor C at the negative input terminal of the comparator; (S2) passing The comparator judges the magnitude of the threshold voltage VS0-ΔV0 and the VS voltage within a fixed time interval; (S3) when the VS voltage is less than the threshold voltage VS0-ΔV0, the comparator outputs a high level, and the voltage of the capacitor C drops significantly at this time, indicating that The load current of the load connected to the capacitor C is large, and vice versa, the load current of the load connected to the capacitor C is small. Through the above solution, the present invention achieves the purpose of accurately judging the magnitude of the load current in the circuit, and has high practical value and popularization value.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits, and in particular relates to a method for detecting load current. Background technique [0002] In the charging system, it is generally judged by detecting the magnitude of the load current whether the load terminal is fully charged or whether it has been unplugged. The existing technology basically judges the load size by directly sampling the current on the charging path. There are two general methods: the first is to connect a sense resistor in series on the charging path, and the circuit will measure the voltage across the sense resistor. The second is to directly sample the voltage difference between the two ends of the isolation tube. The first way (such as figure 1 As shown), the charging device controls the entire charging process by controlling the gate VDRV voltage of the isolation tube. In order to stabilize the input voltage of the charging load, a load capacitor of seve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/00
Inventor 肖哲飞
Owner SOUTHCHIP SEMICON TECH SHANGHAI CO LTD
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