Multi-phase Converter Transient Response Circuit
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Solution Overview
Problem
Multi-phase converters face delays in responding to load transients due to the need to wait for a system clock pulse before turning on control switches, which can lead to inadequate power delivery during sudden load changes.
Innovation Solution
Implementing a circuit that compares the output voltage difference with a reference voltage to immediately turn on at least one control switch, and preferably all, when the output voltage exceeds a prescribed threshold, allowing for rapid response to load transients without waiting for a clock pulse.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If control switches are turned on only when a clock pulse occurs, then the converter operates in a controlled multi-phase sequence, but the response time to load transients is delayed
Solution Approach 1:
The patent implements a preliminary action by detecting output voltage drops before the clock pulse occurs and pre-turning on control switches in advance. The transient response circuit monitors the output voltage and activates control switches proactively when a load transient is detected, rather than waiting for the scheduled clock pulse, thereby reducing response time while maintaining controlled operation
Solution Approach 2:
The converter employs self-service through automatic transient detection and response. The control circuit continuously monitors output voltage and automatically activates additional control switches when a load transient is detected, without requiring external intervention or complex external control logic, thus improving response time while keeping the control system self-regulating
2Speed
If control switches are turned on immediately upon detecting load transient, then the response to load changes is rapid, but the clock-synchronized multi-phase operation is disrupted
Solution Approach 1:
The patent applies dynamics by making the control switch activation flexible and adaptive. During normal operation, switches are activated according to the fixed clock-synchronized multi-phase sequence. When a load transient is detected, the system dynamically adjusts by allowing immediate switch activation, thus maintaining operational stability while enabling rapid response when needed
Solution Approach 2:
The control system changes operational parameters based on load conditions. Under normal conditions, the converter operates with fixed clock-synchronized timing. When a load transient is detected through voltage drop monitoring, the system changes the activation timing parameter to allow immediate switch turn-on, thus maintaining multi-phase stability while achieving fast transient response
3Measurement precision
If the duty cycle follows the error amplifier signal continuously, then the output voltage is regulated accurately, but the converter cannot respond immediately to load transients occurring between clock pulses
Solution Approach 1:
The patent implements preliminary action by continuously monitoring the output voltage and detecting transients before the next clock pulse arrives. When a transient is detected, the system takes preliminary action by immediately activating control switches and adjusting duty cycles without waiting for the clock-synchronized sampling point, thus maintaining accurate voltage regulation while eliminating the response delay
Solution Approach 2:
The converter employs enhanced feedback by continuously monitoring output voltage and using this information to trigger immediate response actions. The feedback mechanism not only regulates voltage through duty cycle adjustment but also detects transients in real-time and triggers immediate switch activation, thus maintaining regulation accuracy while reducing response time compared to clock-synchronized-only feedback
Data Source
AI summary
A multi-phase converter comprising a plurality of switching circuits each providing a switched voltage to an output node of the converter and wherein each switching circuit sequentially provides a switched output voltage to the output node at which an output voltage of the converter is developed; a clock circuit for providing a plurality of out of phase clock signals to the switching circuits to determine when each switching circuit provides the switched voltage to the output node; each switching circuit comprising first and second series connected switches connected across a DC voltage bus; further comprising a first circuit comparing a first signal proportional to a difference between the output voltage of the converter at the output node and a first reference voltage with a second signal comprising a ramp signal and for producing a pulse width modulated signal to control the on-times of the switches of the connected switching circuit; further comprising a second circuit comparing the first signal proportional to the difference between the output voltage and the first reference voltage to a second reference voltage and if the first signal exceeds the second reference voltage by a prescribed amount, for turning on at least one switching circuit to provide the switched output voltage to the output node prior to occurrence of the clock signal.