Discharge Prevention Circuit for Capacitor Current Detection
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Solution Overview
Problem
Existing discharge prevention circuits for capacitors in communication equipment are inefficient due to high power consumption and large size, particularly when dealing with large current transformers and momentary current changes, which complicates circuit design and increases heat generation.
Innovation Solution
A discharge prevention circuit utilizing a small current transformer, a controller, and a switch that detects charging and discharging currents to prevent capacitor discharge, allowing for efficient control of current flow and reducing power consumption by minimizing the size of the current transformer and eliminating unnecessary components in the main current line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a diode is used as a discharge prevention circuit, then the circuit configuration is simple, but power consumption increases and heat generation occurs
Solution Approach 1:
The patent changes the operating state of the MOSFET from static to dynamic, controlling it to be conductive only when needed (during capacitor charging) and non-conductive otherwise (during capacitor discharge prevention). This parameter change in the switching state eliminates continuous power consumption while maintaining discharge prevention functionality.
2Reliability
If a current transformer is placed in the main current line to detect discharge current, then discharge detection is reliable, but the device size increases and circuit design becomes complicated
Solution Approach 1:
The patent extracts the current detection function from the main current line by placing the current transformer only in the capacitor connection line. This allows reliable detection of capacitor discharge current without the need for a large current transformer in the main power line, thereby reducing overall device size and simplifying circuit design.
Solution Approach 2:
The patent introduces a control circuit as an intermediary that processes the signal from the current transformer and controls the MOSFET switching. This intermediary component enables reliable discharge detection and prevention while allowing the current transformer to be smaller since it only needs to detect capacitor current, not total load current.
3Measurement precision
If a large current transformer is used in the main current line, then discharge current detection is accurate, but power consumption increases and heat generation occurs
Solution Approach 1:
The patent extracts the current detection function from the main current line by placing the current transformer only in the capacitor connection line. This allows reliable detection of capacitor discharge current without the need for a large current transformer in the main power line, thereby reducing overall device size and simplifying circuit design.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively prevents capacitor discharge while minimizing power consumption and heat generation, allowing for a more compact and efficient design that can handle large currents without significant losses.
Implementation Method 1
a current transformer, a control circuit, and an n-channel enhancement MOSFET
Data Source
AI summary
A discharge prevention circuit and electronic equipment with the discharge prevention circuit are provided. The discharging prevention circuit includes a first power line, a second power line, a capacitor, a current detector and a switch. The first and second power lines directly or indirectly connect a power feed line to a load. The capacitor and the current detector are directly or indirectly connected in series between the first and second power lines. The switch is disposed in the first or second power line. The current detector detects at least charging current to the capacitor and discharging current from the capacitor. And if the current detector detects discharging current from the capacitor, the switch acts to stop current flow between the capacitor and the power feed line through the switch.