Current Sensing Module Multiplex Switching Bi-directional Detection
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Solution Overview
Problem
Conventional current sensing modules require additional negative power supply and bias circuits to handle bi-directional and AC currents, complicating circuit design and increasing costs in power conversion applications.
Innovation Solution
A current sensing module utilizing multiplex switching means to selectively couple nodes based on current direction, eliminating the need for a negative power supply and bias circuit, and implementing a time-division multiplexing mechanism for multi-channel current sensing without additional amplifiers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional current sensing module is used to detect bi-directional current, then current detection function is achieved, but additional negative power supply circuit and bias circuit are required, increasing device complexity and cost
Solution Approach 1:
The patent merges the sampling stage circuit and output stage circuit into a single integrated current sensing module. The sampling stage includes a first sampling circuit and second sampling circuit that can be selectively switched, and the output stage includes a third sampling circuit and fourth sampling circuit with switching control. This integration eliminates the need for separate negative power supply and bias circuits, reducing device complexity while maintaining bi-directional current detection capability.
Solution Approach 2:
The patent employs dynamic switching mechanisms where the sampling stage and output stage can selectively connect different circuits based on current direction. Switching control signals dynamically activate appropriate sampling circuits (first/second for one direction, third/fourth for opposite direction), enabling the module to adapt to bi-directional current flow without requiring static additional circuits for each direction.
2Adaptability or versatility
If additional negative power supply and bias circuit are added, then bi-directional current sensing is enabled, but whole design cost of power conversion apparatus is increased
Solution Approach 1:
The current sensing module is designed with universal sampling circuits that can handle both directions of current flow through selective switching. The first and second sampling circuits in the sampling stage, along with the third and fourth sampling circuits in the output stage, form a multi-functional system that detects current in either direction using the same basic circuit structure, eliminating the need for separate dedicated circuits for each direction.
Solution Approach 2:
The module uses periodic switching control to alternate between different sampling circuit configurations based on current direction. The switching control signal periodically activates appropriate circuit pairs (first/second or third/fourth sampling circuits), enabling the system to handle bi-directional current through time-multiplexed operation of shared circuit resources.
3Reliability
If conventional current sensing module is applied to power conversion apparatus with switching operation modes, then current detection is achieved, but circuit design difficulty increases due to current flowing backward
Solution Approach 1:
The current sensing module is segmented into distinct functional stages: a sampling stage with first/second sampling circuits for one current direction and third/fourth sampling circuits for the opposite direction, and an output stage with corresponding sampling circuits. This segmentation allows each circuit pair to be optimized for specific current directions while sharing common control and output infrastructure, reducing overall design complexity.
Solution Approach 2:
The switching control signal acts as an intermediary that coordinates between the sampling stage and output stage. It selectively activates appropriate sampling circuits based on current direction and synchronizes their operation, mediating the interaction between bi-directional current input and unidirectional output signal generation without requiring complex individual circuit designs for each direction.
Data Source
AI summary
A current sensing module and a power conversion apparatus and an electronic apparatus using the same are provided. The current sensing module is suitable for detecting a first load current flowing through a first load. The current sensing module includes a sampling stage circuit and an output stage circuit. The sampling stage circuit couples across the first load and selectively exchanges coupling nodes between the sampling stage circuit and the first load by a multiplex switching means, so as to sample the first load current flowing along a first direction or a second direction, and thus generate a sampling signal. The output stage circuit is coupled to the sampling stage circuit and switches coupling nodes between the output stage circuit and the output terminal of the sampling stage circuit, so as to generate a current indication signal indicating the magnitude of the first load current according to the sampling signal.