Interleave Control Power Supply Device Phase Accuracy
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Solution Overview
Problem
Existing power factor correction (PFC) techniques face challenges in achieving high phase control accuracy and reducing circuit complexity, particularly in interleaved control methods where phase difference detection and control are complex, leading to increased circuit scale and accuracy issues.
Innovation Solution
The proposed interleave control power supply device employs a master and slave converter system with a simplified analog control technique, using on and off phase controllers to generate timing signals with a predetermined phase difference, and a master-side control circuit that generates on and off periods based on error signals and reference voltages, while the slave-side control circuit adjusts periods to maintain a 180° phase difference, independent of capacitor variations and offset voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If digital control technique is used to measure switching cycle based on clock cycle to obtain 180° phase difference, then phase control accuracy is improved, but circuit scale increases due to need for sufficient number of digital bits
Solution Approach 1:
The patent replaces the digital control technique with an analog control technique. Instead of using digital circuits to measure switching cycles and calculate phase differences, the invention uses analog circuits (comparators, capacitors, resistors) to directly generate and compare voltage waveforms, thereby obtaining the 180° phase difference signal. This substitution of analog for digital systems resolves the contradiction by achieving the same phase control function without the circuit complexity associated with digital bit processing.
Solution Approach 2:
The patent changes the control parameter from digital switching cycle measurement to analog voltage waveform comparison. By using voltage signals that naturally exhibit the switching cycle characteristics and comparing their phase relationships through analog means, the system achieves accurate phase difference detection without requiring complex digital processing, thus improving phase control accuracy while reducing circuit scale.
2Measurement precision
If analog control technique with phase difference holding circuit is used, then phase difference control is achieved, but control delay increases and circuit scale increases
Solution Approach 1:
The patent extracts and eliminates the phase difference holding circuit from the control system. Instead of using a separate circuit to hold and maintain the phase difference, the invention directly generates the phase difference through the natural timing relationships of the switching cycles and voltage waveforms. This removal of the holding circuit eliminates the associated control delay and reduces circuit complexity.
Solution Approach 2:
The patent performs the phase difference generation in advance through the design of the switching control architecture itself. The master and slave converter switching cycles are synchronized from the beginning, and the phase difference is inherently established through the control logic, eliminating the need for subsequent holding or correction actions that would introduce delays.
3Measurement precision
If voltage crossing detection circuit is used to determine slave signal timing, then phase difference control is achieved, but circuit complexity increases and phase control accuracy decreases
Solution Approach 1:
The patent replaces the voltage crossing detection circuit with a simpler analog timing generation approach. Instead of detecting when voltages cross and generating slave signals based on those detection events, the system uses predetermined timing relationships established through the switching control architecture, eliminating the need for complex detection circuits and their associated accuracy issues.
Solution Approach 2:
The patent uses a simplified approach where the slave converter's switching waveform is essentially a time-shifted copy of the master converter's waveform. The phase difference is established through direct timing relationships rather than complex detection and generation circuits, achieving accurate phase control through a simpler, more reliable method.
4Measurement precision
If independent switching control circuits are used for respective phases, then phase control is achieved, but circuit scale increases
Solution Approach 1:
The patent merges the control functions of the master and slave converters into a unified control architecture. Instead of using completely independent control circuits for each phase, the system uses a shared control framework where the slave converter's control is derived from and synchronized with the master converter's control signals. This merging reduces the overall circuit scale while maintaining accurate phase control through the inherent synchronization mechanism.
Data Source
AI summary
A two-phase critical interleave PFC boost converter, includes a master-side control circuit configured to critically control a first switching element based on a master signal; and a slave-side control circuit configured to critically control a second switching element based on a slave-signal with a phase difference of 180° from the master signal. In the PFC boost converter, an off period generator of the master-side control circuit feeds an M_ON signal which is the same in waveform as the master signal to an on phase controller of the slave-side control circuit, and the slave-side control circuit determines the rising timing of the slave signal from the rising time of the master signal.