COT Multiphase Parallel Circuit for High-Frequency Power Output
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Solution Overview
Problem
Conventional constant on time (COT) multiphase parallel circuits face difficulties in generating high-frequency RAMP signals due to inherent delays in signal generators produced by BCD processes, limiting the frequency of output power signals in power supply devices.
Innovation Solution
A COT parallel circuit design incorporating a multiphase controller with a frequency divider, phase inverters, period control modules, and OR gates, which allows for the output of multiple power signals in one RAMP signal period without increasing the RAMP signal frequency, enabling high-frequency power signal output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the frequency of the continuous RAMP signal is increased to achieve high-frequency power signal output, then the output frequency of the power supply device is improved, but the difficulty of generating the RAMP signal increases due to inherent delays in BCD process signal generators
Solution Approach 1:
The patent divides the multiphase parallel circuit into multiple independent phase modules (first phase converter, second phase converter, etc.), each capable of operating autonomously. The controller generates control signals for each phase independently, avoiding the need for a single high-frequency continuous RAMP signal. This segmentation allows each phase to operate at high frequency without requiring the entire system to generate a correspondingly high-frequency RAMP signal, thus resolving the contradiction between output frequency and RAMP signal generation difficulty.
2Power
If multiple power signals are output in sequence using a continuous RAMP signal, then the current output capability is improved, but the RAMP signal frequency must be increased proportionally, which exceeds the capability of BCD process signal generators
Solution Approach 1:
The patent employs periodic action by using separate RAMP signals for each phase converter instead of a single continuous high-frequency RAMP signal. Each phase converter operates periodically with its own RAMP signal, and the controller coordinates these periodic operations to achieve high current output capability through parallel operation of multiple phases. This approach maintains manageable RAMP signal frequencies while still achieving the desired power output through phased periodic operation.
3Ease of operation
If a single high-frequency continuous RAMP signal is used to control multiple phase converters, then the control simplicity is maintained, but the maximum operating frequency is limited by BCD process capabilities
Solution Approach 1:
The patent segments the control approach by providing each phase converter with its own control signals generated independently by the controller. Instead of using a single high-frequency continuous RAMP signal that would require BCD process signal generators to operate at impractically high frequencies, the controller generates separate control signals for each phase based on lower-frequency RAMP signals. This segmentation maintains control simplicity at the system level while enabling each phase to operate at high frequency without requiring the entire RAMP signal to be at that frequency.
Data Source
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AI summary
This application provides a COT parallel circuit and a power supply device. After receiving a first power signal output by a first phase converter, the COT multiphase parallel circuit may output a first pulse signal to a second phase converter, where the first pulse signal is used to indicate the second phase converter to output a second power signal. Further, the COT multiphase parallel circuit may output a plurality of power signals in one period of a RAMP signal. A high-frequency power signal can be output without increasing a frequency of the RAMP signal, thereby reducing difficulty of implementing a high-frequency COT multiphase parallel connection.