DC-DC Converter Ideal Diode Through Current Prevention
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Solution Overview
Problem
In DC-DC converters, the ideal diode's erroneous operation due to through current and resonance issues leads to efficiency losses and power consumption increases, particularly in low load states where the second MOS transistor may turn on erroneously, causing voltage drops and energy loss.
Innovation Solution
A DC-DC converter and controller design that includes a pulse generation circuit to keep the second transistor off before the first transistor turns on and an erroneous operation prevention circuit to maintain the second transistor off until the first transistor is on, preventing through current and resonance-induced errors, thereby enhancing efficiency and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the second MOS transistor is used as an ideal diode to prevent energy loss, then conversion efficiency is improved, but through current may flow causing power consumption increase
Solution Approach 1:
The control circuit proactively manages the second MOS transistor's switching timing by detecting the first MOS transistor's state. Before through current can occur, the control circuit ensures the second transistor is appropriately controlled based on the first transistor's on/off status, preventing the harmful current path from forming in the first place
Solution Approach 2:
The control circuit continuously monitors the state of the first MOS transistor and uses this feedback information to adjust the switching control of the second MOS transistor. This closed-loop control ensures that the second transistor only conducts when appropriate, preventing through current while maintaining ideal diode functionality for energy recovery
2Reliability
If the comparator generates detection signal delayed, then the second MOS transistor turns on after first MOS transistor, but through current flows and efficiency decreases
Solution Approach 1:
The control circuit proactively manages the second MOS transistor's switching timing by detecting the first MOS transistor's state. Before through current can occur, the control circuit ensures the second transistor is appropriately controlled based on the first transistor's on/off status, preventing the harmful current path from forming in the first place
Solution Approach 2:
The control circuit continuously monitors the state of the first MOS transistor and uses this feedback information to adjust the switching control of the second MOS transistor. This closed-loop control ensures that the second transistor only conducts when appropriate, preventing through current while maintaining ideal diode functionality for energy recovery
3Use of energy by moving object
If the second MOS transistor remains off to prevent through current, then power consumption is reduced, but erroneous operation may occur during resonance
Solution Approach 1:
The control circuit continuously monitors the state of the first MOS transistor and uses this feedback information to adjust the switching control of the second MOS transistor. This closed-loop control ensures that the second transistor only conducts when appropriate, preventing through current while maintaining ideal diode functionality for energy recovery
Solution Approach 2:
The control circuit dynamically adjusts the second MOS transistor's state based on real-time detection of the first transistor's condition and circuit resonance state. This dynamic control allows the system to adapt to changing conditions, maintaining reliability while minimizing power consumption by keeping the second transistor off only when safe to do so
4Loss of energy
If the ideal diode structure is implemented with second MOS transistor, then forward voltage drop is reduced, but simultaneous conduction of both transistors causes through current
Solution Approach 1:
The control circuit continuously monitors the state of the first MOS transistor and uses this feedback information to adjust the switching control of the second MOS transistor. This closed-loop control ensures that the second transistor only conducts when appropriate, preventing through current while maintaining ideal diode functionality for energy recovery
Solution Approach 2:
The control circuit proactively manages the second MOS transistor's switching timing by detecting the first MOS transistor's state. Before through current can occur, the control circuit ensures the second transistor is appropriately controlled based on the first transistor's on/off status, preventing the harmful current path from forming in the first place
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 through current and erroneous operations, improving the conversion efficiency of the DC-DC converter by maintaining the ideal diode in a disconnected state during low load conditions and ensuring the transistors are not simultaneously on, thus reducing energy loss and maintaining constant output voltage.
Implementation Method 1
The comparator detects the current flowing through the inductor based on the voltage drop between the source and drain of the second MOS transistor
Implementation Method 2
resonance may occur due to a choke coil and smoothing capacitor connected to the output terminal of the DC-DC converter and cause linking
Data Source
AI summary
A DC-DC converter for preventing through current from causing erroneous operation of an ideal diode. A first transistor for receiving input voltage is connected to an ideal diode, which includes a second transistor and a comparator for detecting current flowing through the second transistor and generating a detection signal. A control circuit generates a switching signal for turning the first transistor on and off so as to keep the output voltage constant. A pulse generation circuit generates a pulse signal for turning off the second transistor before the first transistor is turned on and keeping the second transistor turned off for a predetermined period from when the first transistor is turned on. An erroneous operation prevention circuit generates a control signal for keeping the second transistor turned off from when the second transistor is turned off to when the first transistor is turned on.