Switching Power Supply Resume Control for Fast Output Stabilization
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Solution Overview
Problem
Switching power supply devices experience instability in output voltage immediately after resuming switching operations from a low-power mode due to inappropriate output duty, leading to prolonged stabilization times.
Innovation Solution
A switching power supply circuit with phase compensation capacitors and amplifiers that stabilize output voltage by controlling the switching operation modes and supplying specific voltages to capacitors during mode transitions, ensuring quick stabilization upon resumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the switching operation is stopped to reduce power consumption, then efficiency is improved through reduction in switching loss, but output voltage becomes unstable immediately after resuming switching operation
Solution Approach 1:
The patent applies preliminary action by pre-charging the first capacitor to a specific voltage corresponding to the output voltage before resuming switching operation from the stopped state. This preliminary voltage preparation ensures that when switching resumes, the output voltage stabilizes quickly without significant fluctuation, thus resolving the contradiction between energy efficiency during stopped state and voltage stability upon resumption.
2Stability of the object's composition
If the switching operation is performed continuously to maintain stable output voltage, then output voltage stability is maintained, but power consumption increases due to continuous switching loss
Solution Approach 1:
The patent implements dynamics by enabling the switching power supply device to dynamically switch between two operational states: a stopped state for low power consumption and a switching operation state for stable output voltage. The control circuit intelligently transitions between these states based on system requirements, and crucially, prepares the first capacitor voltage before state transitions to ensure smooth handover and maintain stability without continuous switching loss.
3Device complexity
If the first capacitor voltage is not prepared before resuming switching operation, then device complexity is reduced, but output voltage stabilization time is prolonged
Solution Approach 1:
The patent applies preliminary action by pre-charging the first capacitor to a specific voltage corresponding to the output voltage before resuming switching operation from the stopped state. This preliminary voltage preparation ensures that when switching resumes, the output voltage stabilizes quickly without significant fluctuation, thus resolving the contradiction between energy efficiency during stopped state and voltage stability upon resumption.
Data Source
AI summary
A switching power supply circuit includes: a switching circuit switching an input voltage; a first amplifier generating a first voltage; a first phase compensation circuit including a first capacitor and compensating for a phase of the first voltage; a second amplifier generating a second voltage; a second phase compensation circuit including a second capacitor and compensating for a phase of the second voltage; and a drive control circuit executing a switching operation according to the second voltage, wherein the switching power supply circuit operates in a first or second mode, the drive control circuit performs, in the first mode, the switching operation, and stops, in the second mode, the switching operation, and when returning from the second mode to the first mode, a specific voltage corresponding to an output voltage is supplied to the second capacitor and a predetermined voltage is supplied to the first capacitor.