Inrush Current Suppressor Circuit with Shared Components
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Solution Overview
Problem
Conventional inrush current suppressor circuits require multiple diodes and resistors for both stand-by and start-up modes, leading to increased power loss and manufacturing costs due to unnecessary power consumption and part redundancy.
Innovation Solution
An inrush current suppressor circuit that integrates a switch, a stand-by power supply, a common inrush current suppressing diode, a common inrush current suppressing resistor, and a shared capacitor to reduce part count and power loss by eliminating redundant components and optimizing energy storage and distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate inrush current suppressing diodes and resistors are provided for stand-by mode and start-up mode, then inrush current can be suppressed in both modes, but the number of parts increases and power loss occurs due to redundant components
Solution Approach 1:
The patent combines separate inrush current suppressing diodes and resistors for stand-by mode and start-up mode into a single shared inrush current suppressing diode and a single shared inrush current suppressing resistor. This merging eliminates redundant components while maintaining effective inrush current suppression in both operational modes, directly resolving the contradiction between reliability and device complexity
Solution Approach 2:
The shared inrush current suppressing diode and resistor are designed to serve multiple functions: suppressing inrush current during stand-by mode operation and suppressing inrush current during start-up mode operation. This multi-functionality allows a single component to replace what were previously two separate components, reducing part count while maintaining suppression effectiveness
2Reliability
If separate inrush current suppressing diodes and resistors are provided for stand-by mode and start-up mode, then inrush current can be suppressed in both modes, but power loss increases due to continuous current flow through suppressing resistors
Solution Approach 1:
The patent implements dynamic control where the inrush current suppressing diode is turned off during start-up mode when the main switch is activated. This dynamic switching prevents continuous current flow through the suppressing resistor, eliminating unnecessary power loss while maintaining suppression effectiveness during stand-by mode when the diode remains active
Solution Approach 2:
The patent extracts the unnecessary power consumption function by selectively turning off the inrush current suppressing diode during start-up mode. This extraction removes the harmful energy loss through the suppressing resistor while preserving the essential inrush current suppression function during stand-by operation
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 reduces manufacturing costs and improves power efficiency by minimizing the number of parts and eliminating unnecessary power loss, while maintaining effective inrush current suppression in both stand-by and start-up modes.
Implementation Method 1
an inrush current suppressing diode (11) connected to the stand-by power supply part (17) when the switch (1) is turned off
Implementation Method 2
an inrush current suppressing resistor (13) connected to the inrush current suppressing diode (11) in series
Implementation Method 3
a common capacitor (15) connected to the stand-by power supply part (17) so that voltage is applied to the common capacitor (15) when the switch (1) is turned off
Data Source
AI summary
Disclosed is an inrush current suppressor circuit of a power supply circuit that supplies stand-by voltage from AC voltage. At a stand-by mode, only a diode and a resistor for suppressing inrush current are provided, and a capacitor provided in common between a stand-by power supply part and a start-up power supply part is charged, so that the inrush current is suppressed at both of stand-by and start-up modes and the number of devices of a circuit and power consumption are reduced.