Voltage Adjustment Module for DC-DC Converter Efficiency
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Solution Overview
Problem
Conventional DC-to-DC converters experience reduced conversion efficiency in both high and low output current states due to fixed voltage drive signals, leading to excessive power loss and inefficiency.
Innovation Solution
A voltage regulation module is coupled to a power conversion module in a closed loop, using a subtraction circuit and regulation circuit to generate a level voltage proportional to the output current, allowing the PWM circuit to adjust the drive signal voltage accordingly, thereby optimizing conversion efficiency across varying output currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a fixed voltage level (5V or 12V) is used to drive the power switch module, then the conversion efficiency is improved in one current state, but the conversion efficiency deteriorates in the other current state
Solution Approach 1:
The patent applies the dynamics principle by making the drive signal voltage level variable instead of fixed. The voltage regulation module dynamically adjusts the voltage level of drive signals based on the output current state of the DC-to-DC converter. When output current is high, the drive voltage is increased to 12V to reduce internal resistance and conduction loss; when output current is low, the drive voltage is reduced to 5V to minimize switching loss. This dynamic adaptation resolves the contradiction between optimizing efficiency for different current states.
Solution Approach 2:
The patent applies parameter changes by modifying the voltage level parameter of the drive signal according to operating conditions. The system changes the drive voltage parameter between 5V and 12V based on the output current magnitude. This parameter adjustment allows the power switch module to operate with optimal internal resistance characteristics in high current states while minimizing excessive power loss in low current states, thereby resolving the efficiency contradiction.
2Power
If a higher voltage level (12V) is used to drive the power switch module, then the internal resistance is reduced in high current state, but excessive power loss occurs in low current state
Solution Approach 1:
The voltage regulation module dynamically adjusts the drive signal voltage level based on real-time output current detection. In high current states, the system switches to 12V drive level to reduce internal resistance and improve power delivery capability. In low current states, the system switches to 5V drive level to prevent excessive power loss during switching operations. This dynamic voltage adjustment resolves the contradiction between drive capability and power loss.
Solution Approach 2:
The system changes the drive voltage parameter from a fixed value to a variable value that adapts to load conditions. By adjusting the voltage parameter between 5V and 12V based on output current magnitude, the system optimizes the balance between achieving sufficient drive power in high current states and minimizing switching power loss in low current states.
Data Source
AI summary
A voltage regulation module coupled to a power conversion module to form a closed loop. The power conversion module includes a PWM circuit and a conversion circuit. The conversion circuit includes serially coupled first and second power switches. The PWM circuit outputs a drive signal to control the first and second power switches to cause the conversion circuit to generate an output current. The voltage regulation module includes subtraction and regulation circuits. The subtraction circuit obtains a voltage related to the output current, and performs a subtraction operation on this voltage and a reference voltage to generate a second regulation voltage. The regulation circuit generates a level voltage, which is directly proportional to the output current, according to the second regulation voltage. The PWM circuit adjusts a voltage level of the drive signal according to the level voltage so that this voltage level follows the output current.