Clock domain crossing controller of digital control switch power supply and control method thereof

Abstract

The invention relates to a clock domain crossing controller of a digital control switch power supply and a control method thereof. The controller comprises a potential-divider network, a analog to digital converter, a digital compensator, a digital pulse modulation circuit, a drive circuit and a clock logic circuit, wherein after data at the output end of a switching power supply is acquired, a voltage control signal of the switching power supply is output through carrying out sequential processing on the data by all modules, and the clock logic circuit provides a working clock of the controller. The invention adopts a system structure of synchronous clock two-edge trigger, overcomes the data delay steady state introduced by the clock single-edge trigger, and is used for optimizing the system data processing part on the basis of maintaining the advantages of the common digital control, thereby reducing the control signal hysteresis in the system, realizing a real-time data control system, cutting off the work of the forestage module after the synchronous clock pulse is ended, and saving the system power consumption.

Description

technical field [0001] The invention belongs to the field of electronic technology, relates to the design of an integrated circuit, and is used for a switching power supply of digital control technology, in particular to a cross-clock domain controller of a digital control switching power supply and a control method thereof. Background technique [0002] The switching power supply using digital control technology can significantly improve the performance of the power system, because the digital control method is flexible, can realize complex control algorithms, and is less sensitive to external influences, such as being less affected by device changes. [0003] The control loop of a digital power supply is formed by cascading multiple functional modules, and how to ensure the synchronous collection of data collection points of each module is a very important issue in digital technology. When data is transmitted across the clock domain, the input data and the sampling clock a...

AI Technical Summary

Problems solved by technology

Among the existing digital control switching power supply solutions, one is to use multiple shift registers to hold data in front of the digital pulse width modulation circuit. The advantage is that all the data generated by the previous stage can be processed, but the current processing control The signal is the value corresponding to the data several switching cycles ago, which cannot realize real-time control of the system; another method is to perform "cold" processing on the accumulated data, that is, do not do anything to the data that the digital pulse width modulation circuit has no time to process. Processing, DPWM only processes the data at the current input end. This scheme has a simple circuit structure, but part of the data will be lost, and the processed data still has a delay. It is not the latest data, and the cycle corresponding to the data being processed cannot be known.

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