Accelerating Discharge Circuit for IEC 62368-1 Power Supply Compliance
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Solution Overview
Problem
Conventional power supply devices fail to meet the requirements of the second edition of IEC 62368-1, which mandates that input voltage be discharged to 60V within 2 seconds under normal conditions and to 120V within 2 seconds under abnormal conditions when external input power is removed.
Innovation Solution
An accelerating discharge device comprising a first and second parallel inductive element, a capacitor, noise suppression elements, one-way elements, and discharge circuits that generate control voltages and selectively couple inductive elements to ground, significantly increasing discharging speed by using a combination of inductive elements and discharge circuits to manage and direct energy release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a conventional power supply device is used, then the device structure is simple, but the discharging time exceeds 2 seconds and does not meet IEC 62368-1 requirements
Solution Approach 1:
The power supply device is segmented into multiple independent modules: first and second parallel inductive elements, first and second capacitors, first and second discharge circuits, and first and second switch elements. Each module can be independently controlled to discharge, allowing the system to meet the 2-second discharge requirement through coordinated operation of multiple segments rather than relying on a single large capacitor.
Solution Approach 2:
The discharge circuits dynamically control the switch elements based on real-time voltage detection. When the input voltage drops below threshold values (first threshold voltage for normal discharge, second threshold voltage for abnormal discharge), the control circuit activates the appropriate switch elements to engage discharge paths, creating a dynamic response that adapts to changing voltage conditions to ensure compliance with discharge time requirements.
2Speed
If multiple parallel inductive elements are used to reduce discharging time, then the discharging speed increases, but the interference between inductive elements increases
Solution Approach 1:
Noise suppression elements are introduced as intermediary components between the first and second parallel inductive elements. These elements act as mediators that filter and suppress electromagnetic interference generated by the inductive elements during switching operations, allowing the system to maintain high discharging speed while eliminating the harmful interference that would otherwise be generated by multiple parallel inductors.
Solution Approach 2:
The harmful interference generated by parallel inductive elements is extracted and directed to dedicated noise suppression elements. By separating the interference management function from the main discharge function, the system can maintain high discharging speed while the extracted interference is handled by specialized components designed to suppress electromagnetic noise.
3Loss of time
If discharge circuits are added to meet IEC 62368-1 requirements, then the discharging time is reduced to within 2 seconds, but the device complexity increases
Solution Approach 1:
The discharge circuits are designed with multi-functionality to reduce overall device complexity. The first and second discharge circuits share common components and control logic, and the switch elements can operate in multiple modes (normal discharge and abnormal discharge). This universal design allows the system to meet IEC 62368-1 requirements while minimizing the increase in device complexity through component sharing and integrated control.
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 proposed design reduces the overall discharging time, meeting the IEC 62368-1 requirements by ensuring the input voltage falls to 60V within 1.315 seconds under normal conditions and to 120V within 0.79 seconds under abnormal conditions, thus enhancing compliance with safety standards.
Implementation Method 1
The first parallel inductive element generates a first control voltage according to a first input voltage
Implementation Method 2
The second parallel inductive element generates a second control voltage according to a second input voltage
Implementation Method 3
The first capacitor is coupled between the first parallel inductive element and the second parallel inductive element
Data Source
AI summary
An accelerating discharge device includes a first parallel inductive element, a second parallel inductive element, a first capacitor, a noise suppression element, a one-way element, a first discharge circuit, a second discharge circuit, a first switch element, and a second switch element. The first parallel inductive element generates a first control voltage according to a first input voltage. The second parallel inductive element generates a second control voltage according to a second input voltage. The first switch element selectively couples the first parallel inductive element through the second discharge circuit to a ground according to the first control voltage. The second switch element selectively couples the second parallel inductive element through the second discharge circuit to the ground according to the second control voltage.