Two-Stage Switch Power Supply Voltage Limiting Delay Module
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Solution Overview
Problem
Increasing the output voltage of the first conversion module in a two-stage switch power supply to prevent intermittent operation increases consumption, leading to inefficiencies.
Innovation Solution
A two-stage switch power supply with a voltage limiting delay module that controls the start of the second-stage conversion module, using a triode and capacitor to rapidly reset the soft start PWM pin, ensuring efficient and low-loss operation by delaying the start until a preset voltage is reached.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the output voltage of the first conversion module is increased to prevent intermittent operation, then the stability of power supply operation is improved, but the energy consumption of the switch power supply increases
Solution Approach 1:
The voltage limiting switch module is configured to limit the output voltage of the first conversion module to a preset voltage value before the second conversion module starts operating. This preliminary voltage limitation prevents the first conversion module from operating in an intermittent state, thereby ensuring stable operation without requiring excessive voltage increase that would lead to higher energy consumption.
Solution Approach 2:
The invention changes the voltage parameter dynamically by using the voltage limiting switch module to maintain the output voltage of the first conversion module at a preset value during the startup phase. This parameter control ensures the first conversion module operates stably at an optimized voltage level rather than requiring continuously high voltage, thus reducing energy consumption while preventing intermittent operation.
2Reliability
If the output voltage of the first conversion module is increased to prevent intermittent operation, then the continuous operation of the switch power supply is improved, but the power loss increases
Solution Approach 1:
The voltage limiting switch module performs preliminary voltage limitation on the output of the first conversion module, ensuring it reaches a stable preset voltage before the second conversion module activates. This preliminary action enables continuous operation of the power supply without requiring sustained high voltage levels that would cause excessive power loss.
Solution Approach 2:
The voltage limiting switch module automatically regulates the output voltage of the first conversion module to the preset value, enabling the system to self-adjust and maintain optimal operating conditions. This self-regulation ensures continuous operation while minimizing power loss by preventing voltage from exceeding the necessary threshold.
3Reliability
If the output voltage of the first conversion module is increased to prevent intermittent operation, then the stability of voltage supply to the second conversion module is improved, but the overall efficiency of the power supply decreases
Solution Approach 1:
The voltage limiting switch module performs preliminary voltage stabilization by limiting the output of the first conversion module to a preset value. This ensures the second conversion module receives stable voltage input for reliable operation, while the limitation prevents excessive voltage that would reduce overall power supply efficiency.
Solution Approach 2:
The invention optimizes the voltage parameter by dynamically controlling it through the voltage limiting switch module. The output voltage of the first conversion module is maintained at an optimal preset value, ensuring stable supply to the second conversion module while maximizing overall system efficiency by avoiding unnecessary voltage elevation.
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
This solution prevents intermittent working states while achieving rapid start-ups with high efficiency and low loss, maintaining a simple structure and low overall cost.
Implementation Method 1
the voltage limiting switch module is configured to operate as a voltage limiting delay module comprising a triode Q71 and a capacitor C70, both connected in parallel across the soft start PWM pin and ground, and being configured to rapidly discharge the capacitor C70 through the triode Q71
Implementation Method 2
the voltage limiting switch module is configured to operate as a voltage limiting delay module comprising a triode Q71 and a capacitor C70, both connected in parallel across the soft start PWM pin and ground
Data Source
Figure 1~2
Figure 3~4
AI summary
Disclosed is a two-stage switch power supply (10), comprising an input rectification module (101), a first control module (102), a first conversion module (103), a second control module (106), a second conversion module (104) and a voltage-limiting switch module (105). The first control module controls the first conversion module so that same carries out voltage conversion on a rectification filtering voltage signal so as to acquire a power supply voltage and a bus voltage; the first conversion module outputs the power supply voltage to the first control module, and outputs the bus voltage to the second conversion module, the voltage-limiting switch module and the second control module; and the voltage-limiting switch module controls, when the bus voltage reaches a pre-set voltage, the second control module so that same outputs a voltage signal to the second conversion module so as to control the second conversion module so that same converts the bus voltage and then outputs the voltage to a load. Thus, the problem of a switch power supply being in an intermittent working state due to a voltage output by a first conversion module being low is avoided, and the overall structure is simple.