A PWM modulation circuit based on data control

Abstract

The invention provides a PWM modulation circuit based on data control, external control units may be connected via data interfaces, transfer of data to the first register. The data is then accuratelyassigned to the fifth register (cycle register) and the second register (PWM pulse width register) under the control of the logic controller. Finally, under the control of the logic controller, the first counter and the second counter convert the data in the fifth register (cycle register) and the second register (PWM pulse width register) into corresponding state level signals, and the PWM modulation is completed by a latch. As that circuit of the invention is simple, the software is not require to be written, and in practical application, the software of the external control unit is only required to be update and maintained, the operation and control unit is separated from the PWM modulation unit, the CPLD and the FPGA chip are omitted, and the ARM chip plus the PWM modulation circuit ofthe invention can be realized.

Description

technical field The invention relates to AC-DC and DC-DC circuits, in particular to a PWM modulation circuit of a digital switching power supply mainly controlled by a digital programmable chip. Background technique Since the birth of digital switching power supply, digital switching power supply has been widely used in various fields due to its unique advantages, such as multi-channel redundant power supply system and fields requiring power-on sequence, and the power supplies can communicate with each other. The main features of flexible control mode, convenient management and high control precision have become the best choice for power solutions in this field. However, since the birth of digital switching power supply for many years, its main solutions are still based on typical solutions such as DSP, ARM+CPLD, and ARM+FPGA. Apart from the above main solutions, there are almost no other digital power supply solutions. The DSP scheme is relatively mature, and the cost is...

AI Technical Summary

Problems solved by technology

However, since the birth of digital switching power supply for many years, its main solutions are still based on typical solutions such as DSP, ARM+CPLD, and ARM+FPGA. Apart from the above main solutions, there are almost no other digital power supply solutions.

The DSP solution is relatively mature, and the cost is acceptable. Due to its unique software development environment and complex register configuration, its popularization is limited to a certain extent.

In addition, due to the singleness of the solution, the digital switching power supply of the DSP solution will inevitably become homogeneous in terms of cost, performance and core technology over time, and it is highly dependent on the DSP chip.

ARM+CPLD and ARM+FPGA solutions have become the new darlings in recent years, but the procurement costs of CPLD and FPGA chips are very high, even exceeding the main control chip (ARM)

CPLD and FPGA chips and DSP chips also have a unique software development environment and complex register configuration. The engineering software needs to be divided into two parts. In addition, the compatibility between the versions of the software development environment is relatively poor, which makes it difficult to update and maintain the engineering software.

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