A pwm modulation circuit based on data control

Abstract

The present invention provides a PWM modulation circuit based on data control. The external control unit can transmit data to the first register through the data interface, and then accurately distribute the data to the fifth register (period register) under the control of the logic controller. And in the second register (PWM pulse width register), finally pass under the control of the logic controller, the first counter, the second counter, the fifth register (period register) and the second register (PWM pulse width register) The data is converted into the corresponding state level signal, and the PWM modulation is completed through the latch. The invention has a simple circuit and does not need to write software itself. In practical application, it only needs to update and maintain the software of the external control unit, and separates the calculation and control unit from the PWM modulation unit, eliminating the need for CPLD and FPGA chips. Only the ARM chip + the PWM modulation circuit of the invention can be realized.

Description

technical field [0001] 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 [0002] 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. [0003] 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. [0004] The DSP scheme is re...

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Problems solved by technology

[0003] 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.

[0004] The DSP solution is relatively mature, and the cost is acceptable. Due to its unique software development environment and complex register configuration, its popularity 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.

[0005] 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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