Power Switch Gate Control Using Auxiliary Voltage Hold-Up
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Solution Overview
Problem
Switch control devices fail to sense power voltage decreases, leading to latched outputs that can damage power switches and supply excessive power, especially when the voltage drops below a certain threshold, causing malfunction and heat generation.
Innovation Solution
A switch control device with an auxiliary power device that includes a parasitic capacitor and power capacitor, along with a control pulse generator and logic unit, generates a stable gate signal by maintaining an auxiliary power voltage higher than the transmission voltage, even when the main power voltage drops below the recognition threshold, using diodes and inverters to ensure proper switching operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the switch control device uses direct power voltage sensing, then the device structure is simple, but the device cannot detect power voltage decreases below the transmission voltage threshold
Solution Approach 1:
The patent introduces an auxiliary power device as an intermediary component that converts the main power voltage into an auxiliary power voltage through a parasitic capacitor. This intermediary mechanism enables the control device to detect power voltage abnormalities even when the direct power voltage drops below the transmission voltage threshold, as the auxiliary power voltage provides an extended detection range
Solution Approach 2:
The patent extends the detection capability from a single voltage dimension (main power voltage) to a dual-dimension system by introducing the auxiliary power voltage. When the main power voltage decreases, the auxiliary power voltage changes in response, providing an additional detection dimension that allows the device to sense power abnormalities that would otherwise be undetectable
2Use of energy by moving object
If the power voltage drops below the transmission voltage, then energy consumption is reduced, but the output signal becomes latched and causes excessive power supply to the load
Solution Approach 1:
The patent implements a feedback mechanism where the auxiliary power device continuously monitors the main power voltage status and provides feedback through the auxiliary power voltage. When the main power voltage drops below the transmission voltage, the auxiliary power voltage reflects this change, enabling the control device to detect the abnormal state and prevent inappropriate output latching, thus maintaining reliability even during voltage drops
Solution Approach 2:
The patent prepares for potential power voltage drops by introducing the auxiliary power device in advance. This preliminary measure ensures that when the main power voltage decreases, the system already has an extended detection mechanism in place to prevent latch-up conditions, cushioning against the harmful effects before they occur
3Duration of action of stationary object
If the output remains latched during low power voltage, then the control device maintains operational state, but excessive heat is generated causing damage to the power switch and control device
Solution Approach 1:
The feedback mechanism through the auxiliary power device allows the control device to continuously monitor power voltage status and adjust operation accordingly. When power voltage drops occur, the auxiliary power voltage provides feedback that prevents inappropriate continued operation, thereby reducing heat generation and preventing damage while maintaining operational continuity under normal conditions
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 allows the switch control device to stably generate gate signals during abnormal power voltage states, preventing latch-up and excessive power supply, thus protecting the power switch and switch control device from damage.
Implementation Method 1
an auxiliary power device including a parasitic capacitor and charging the parasitic capacitor by receiving a power voltage to generate an auxiliary power voltage
Implementation Method 2
a diode having a cathode connected to a first end of the parasitic capacitor and an anode to which the power voltage is input, and the parasitic capacitor is charged by a current flowing through the diode
Data Source
AI summary
The switch control device controls a switching operation of a power switch. The switch control device includes an auxiliary power device. The auxiliary power device includes a parasitic capacitor, and charges the parasitic capacitor by receiving a power voltage to generate an auxiliary power voltage. The switch control device includes a control pulse generator driven by the auxiliary power voltage and generating a set pulse and a reset pulse according to an input signal that is input for controlling the switching operation of the power switch. The switch control device generates a gate signal that turns on the power switch by being synchronized with the set pulse and generates a gate signal that turns off the power switch by being synchronized with the reset pulse.