Switching Power Conversion Circuit Standby Mode Control
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Solution Overview
Problem
Conventional switching power supplies continue to consume electrical energy even when no energy is needed by the system circuit, failing to meet power-saving requirements.
Innovation Solution
A switching power conversion circuit with a power circuit, feedback circuit, and control circuit that alternately conducts and shuts off a first switch circuit based on a power-status signal, disabling the control circuit and reducing output voltage and auxiliary voltage when the system is not in use, thereby minimizing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the switching power supply continuously operates to maintain rated output voltage, then the output voltage stability is improved, but the power consumption increases
Solution Approach 1:
The patent applies dynamics by making the switching power supply's operation state changeable between active and standby modes based on system circuit status. The control circuit dynamically adjusts the switching circuit operation: in active mode it maintains rated output voltage for stability, while in standby mode it reduces switching frequency or duty cycle to lower power consumption, thus resolving the contradiction between continuous operation stability and power saving.
Solution Approach 2:
The patent changes operational parameters (switching frequency, duty cycle, or output voltage level) based on system circuit status. When the system circuit is inactive, the control circuit modifies these parameters to reduce power consumption while still maintaining the ability to quickly restore rated output voltage when needed, thereby balancing reliability and energy efficiency.
2Speed
If the switching power supply is continuously operated, then the response speed to system circuit needs is improved, but the power consumption increases
Solution Approach 1:
The patent implements preliminary action by maintaining the switching power supply in a ready state with minimal operation during standby mode, rather than completely shutting down. This allows the circuit to quickly transition to full operation when the system circuit becomes active, achieving fast response without the continuous power consumption of full-time operation.
Solution Approach 2:
The patent uses periodic action by implementing intermittent switching or pulse-width modulation at reduced duty cycles during standby mode. The control circuit periodically activates the switching circuit to maintain minimal output voltage or to recharge energy storage elements, enabling rapid response when needed while significantly reducing average power consumption compared to continuous operation.
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 reduces power consumption by disabling the power conversion circuit when the system is inactive, achieving a power-saving purpose without interrupting the input voltage.
Implementation Method 1
The input voltage is converted into the output voltage and a first auxiliary voltage by alternately conducting and shutting off the first switching circuit
Data Source
AI summary
A switching power conversion circuit receives an input voltage and generates an output voltage to a system circuit. The switching power conversion circuit includes a power circuit, a feedback circuit, a control circuit, and an initiation circuit. The power circuit includes a first switch circuit. The feedback circuit generates a feedback signal according to a power-status signal and the output voltage. The first switching circuit is conducted or shut off according to the feedback signal under control of the control circuit, so that the input voltage is converted into the output voltage and the first auxiliary voltage by the power circuit. If the power-status signal is in an off status, a ratio of the feedback signal to the output voltage is equal to a first feedback ratio and the magnitude of the first auxiliary voltage is lower than a normal operating voltage value, so that the control circuit is disabled.