Current detection circuit, current detection method and converter
By designing a current detection circuit including a current transformer, a magnetic reset circuit, a chip selection circuit, a sampling circuit and a clamp circuit, the problem of bidirectional current detection cannot be realized in the prior art, and the detection of bidirectional current and peak current control are realized.
CN113640565BActive Publication Date: 2025-03-25DELTA ELECTRONICS (SHANGHAI) CO LTD
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Patent Information
- Application Number
- CN202110842529.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2021-07-26
- Publication Date
- 2025-03-25
- Estimated Expiration
- 2041-07-26
AI Technical Summary
Technical Problem
The existing detection circuit based on current transformers cannot realize bidirectional current detection and cannot meet the needs of bidirectional energy transmission in applications such as on-board chargers.
Method used
A current detection circuit including a current transformer, a magnetic reset circuit, a chip selection circuit, a sampling circuit and a clamp circuit are designed to detect bidirectional current through mode switching of the chip selection circuit.
Benefits of technology
It realizes the detection capability of bidirectional current, and can provide accurate current detection results when the converter has bidirectional energy transmission requirements and supports peak current control.
✦ Generated by Eureka AI based on patent content.
Abstract
The present application provides a current detection circuit, comprising a current transformer, a magnetic reset circuit, a chip select circuit, a sampling circuit and a clamp circuit. The primary winding of the current transformer receives the current to be detected and generates a sampling current in the secondary winding. The magnetic reset circuit is used to reset the current transformer. The chip select circuit is electrically connected to the magnetic reset circuit and can be switched between a first mode and a second mode. The first mode is used to detect a current to be detected having a first direction, and the second mode is used to detect a current to be detected having a second direction opposite to the first direction. The sampling circuit is electrically connected to the chip select circuit to sample the sampling current and output a sampling signal to a controller. The clamp circuit is electrically connected between the sampling circuit and the controller and provides a reference potential. The present application also provides a converter having the current detection circuit.
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