Push-Pull Power Control Circuit for Balanced Multi-Channel Output
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Solution Overview
Problem
Open-loop controlled push-pull switching power systems face challenges in maintaining stable output voltage across multiple channels due to input voltage changes, leading to imbalanced multi-channel outputs and increased circuit complexity when additional stabilizing circuits are added.
Innovation Solution
A power control circuit with a feedback module and control module is implemented, allowing closed-loop feedback control of switching tubes based on preset power voltage and feedback signals to adjust output electrical signals, without increasing circuit costs or complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If one channel output is used as feedback loop for voltage stabilization, then output voltage stability is improved, but multi-channel output balance deteriorates
Solution Approach 1:
The patent segments the feedback control by channel, with each output channel having its own independent feedback module that monitors its dedicated sampling winding. This allows each channel to be controlled independently, preventing the voltage imbalance caused by single-channel feedback while maintaining overall voltage stability across all channels.
Solution Approach 2:
The patent transitions from single-channel feedback to multi-dimensional feedback by introducing separate feedback paths for each output channel through dedicated sampling windings. This dimensional expansion of the feedback system enables simultaneous voltage stabilization across multiple channels without compromising channel balance.
2Reliability
If voltage stabilizing circuit is added, then output voltage stability is improved, but circuit complexity and cost increase
Solution Approach 1:
The patent makes each sampling winding serve multiple functions: it simultaneously provides feedback for its dedicated channel's voltage stabilization and contributes to the overall multi-channel balance. This universal application of sampling windings eliminates the need for additional dedicated stabilizing circuits, reducing overall circuit complexity while maintaining voltage stability.
Solution Approach 2:
Each output channel self-regulates its voltage through its own feedback module and sampling winding, without requiring external stabilizing circuits. The system achieves voltage stabilization through self-service feedback control, eliminating the need for additional complexity-inducing stabilizing components.
3Reliability
If feedback control is implemented on one channel, then power supply quality is improved, but circuit cost increases
Solution Approach 1:
The patent merges the feedback control functions across all channels by having each channel share the same control module while maintaining independent feedback paths. This consolidation approach improves power supply quality through comprehensive feedback control without proportionally increasing circuit cost, as the control module serves multiple channels simultaneously.
Data Source
AI summary
An embodiment of the present disclosure provides a power control circuit and a power supply device. The circuit is provided with a feedback module and a control module. A first end of the feedback module is connected to a primary side circuit of a push-pull switching power, a second end of the feedback module is connected to the control module, and the feedback module is configured to generate a corresponding feedback signal according to an electrical signal of the primary side circuit of the push-pull switching power. The control module is respectively connected to control ends of two switching tubes in the primary side circuit of the push-pull switching power, and the control module is configured to control on-off states of the two switching tubes according to a preset power voltage and the feedback signal, so as to adjust output electrical signals of power output channels.