Boost Converter Parasitic Capacitance ZVS
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Solution Overview
Problem
Conventional boost converters face reduced output efficiency due to non-ideal parasitic capacitance in switch elements, which prevents perfect Zero Voltage Switching (ZVS) operations.
Innovation Solution
A boost converter design incorporating a first inductor, a power switch element with a built-in parasitic capacitor, a tuning circuit with second and third inductors, and a current-limiting path, forming an equivalent transformer to balance charging and discharging operations of the parasitic capacitor, allowing for nearly lossless ZVS operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional boost converter uses a power switch element with parasitic capacitance, then the circuit can be implemented with standard components, but the output efficiency is reduced due to non-ideal ZVS operation
Solution Approach 1:
The patent introduces an intermediary circuit between the power switch element and ground, consisting of two inductors connected in series with their middle point grounded. This intermediary circuit acts as a mediator to balance the charging and discharging of the parasitic capacitor, enabling the switch to achieve near-perfect ZVS operation and thereby resolving the contradiction between energy loss and switching reliability
Solution Approach 2:
The patent changes the electrical parameters of the circuit by introducing specific inductance values in the intermediary circuit. By carefully selecting the inductance parameters of the two inductors, the circuit transforms the non-ideal parasitic capacitance characteristics into beneficial effects, allowing the switch to operate with near-perfect ZVS and significantly improving output efficiency
2Loss of energy
If the parasitic capacitor is not balanced, then the circuit structure remains simple, but energy loss increases due to imperfect ZVS
Solution Approach 1:
The patent introduces an intermediary circuit between the power switch element and ground, consisting of two inductors connected in series with their middle point grounded. This intermediary circuit acts as a mediator to balance the charging and discharging of the parasitic capacitor, enabling the switch to achieve near-perfect ZVS operation and thereby resolving the contradiction between energy loss and switching reliability
Solution Approach 2:
The patent segments the ground connection path into two separate inductor branches instead of using a single direct connection. This segmentation allows independent control of charging and discharging paths for the parasitic capacitor, balancing the energy flow and reducing losses while maintaining reasonable circuit complexity
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 increases the output efficiency of the boost converter by suppressing non-ideal parasitic capacitance characteristics, enabling efficient energy transfer and suitable for various electronic devices.
Implementation Method 1
The first inductor, the second inductor, and the third inductor are mutually coupled to each other, so as to form an equivalent transformer
Implementation Method 2
A parasitic capacitor is built in the power switch element
Data Source
AI summary
A boost converter includes a first inductor, a power switch element, a tuning circuit, and an output stage circuit. The first inductor is configured to receive an input voltage. A parasitic capacitor is built in the power switch element. The power switch element selectively couples the first inductor to a ground voltage according to a clock voltage. The output stage circuit is configured to generate an output voltage. The tuning circuit includes a second inductor, a third inductor, and a current-limiting path. The second inductor is coupled to the first inductor and the power switch element. The third inductor is coupled through the current-limiting path to the output stage circuit. The first inductor, the second inductor, and the third inductor are mutually coupled to each other, so as to form an equivalent transformer.