Flyback Power Supply Dynamic Frequency Adjustment
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Solution Overview
Problem
Existing flyback switching power supplies lack the ability to adjust their working frequency in response to varying environmental conditions, leading to potential temperature rises and reduced efficiency, especially in high-load situations.
Innovation Solution
A flyback switching power supply with a frequency adjustment circuit that includes a PWM control integrated circuit, a primary side module with a resistor and optical coupler, and a secondary side module with operational amplifiers, allowing the working frequency to be dynamically adjusted based on load conditions through optical coupling and resistor configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the flyback switching power supply uses a fixed working frequency, then the circuit structure is simple, but the power supply cannot adapt to different working environments and may cause temperature rise
Solution Approach 1:
The patent implements dynamic frequency adjustment by introducing a frequency adjustment circuit that modifies the working frequency based on load conditions. The circuit switches between different frequency states (first working frequency for high load, second working frequency for low load) to optimize performance across different operating environments, resolving the contradiction between adaptability and structural simplicity.
2Productivity
If the flyback switching power supply operates at high frequency, then the output capacity and response speed are improved, but the temperature rise increases and energy efficiency decreases
Solution Approach 1:
The patent dynamically adjusts the working frequency based on load conditions. Under high load conditions, a higher first working frequency is used to maximize output capacity and response speed. Under low load conditions, a lower second working frequency is used to reduce energy losses and temperature rise. This dynamic adaptation resolves the contradiction between productivity and energy efficiency.
3Loss of energy
If the flyback switching power supply operates at low frequency, then the energy efficiency is improved and temperature rise is reduced, but the output capacity and response speed decrease
Solution Approach 1:
The patent employs dynamic frequency switching to resolve this contradiction. When the load is high, the system operates at a higher frequency to maintain adequate output capacity. When the load is low, the system switches to a lower frequency to improve energy efficiency and reduce temperature rise. This conditional adaptation allows the system to optimize both energy efficiency and productivity based on actual operating 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
Enables the flyback switching power supply to operate at lower frequencies under low loads for energy savings and higher frequencies under high loads, reducing temperature rise and enhancing output capacity, thus improving reliability and adaptability.
Implementation Method 1
a frequency adjustment circuit connected between the chip working frequency setting pin of the PWM control integrated circuit and the voltage and current feedback circuit
Data Source
AI summary
The invention discloses a flyback switching power supply, including a power input and rectifying circuit; a DC-DC switching circuit, the DC-DC switching circuit comprising a PWM control integrated circuit; and a voltage and current feedback circuit. The PWM control integrated circuit comprises a chip working frequency setting pin for setting a working frequency of the PWM control integrated circuit, the flyback switching power supply further comprises a frequency adjustment circuit connected between the chip working frequency setting pin of the PWM control integrated circuit and the voltage and current feedback circuit, and the frequency adjustment circuit is configured to decrease the working frequency when the flyback switching power supply is under a low load condition, and increase the working frequency when the flyback switching power supply is under a high load condition.