A PFM modulation circuit based on data control

Abstract

The invention provides a PFM modulation circuit based on data control, external control units may be connected via data interfaces, data is transferred to the logical controller, and then allocating the data to the fifth register and the second register accurately under the control of the logic controller, finally, under the control of the logic controller, the first counter and the second counterstart counting, and the data in the fifth register and the second register are converted into corresponding state level signals, and pulse modulation is completed through a latch, and finally complementary pulses with a duty cycle of 50% are output. The invention saves CPLD and FPGA chips, only needs ARM chip + PFM modulation circuit of the invention to realize, can be integrated to form a unit circuit, can also be integrated to mass production, and can effectively reduce the cost.

Description

technical field [0001] The invention relates to AC-DC and DC-DC circuits, in particular to a PFM 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 charging and inverter power supply in peak shifting power system and solar and wind power generation fields. Its main characteristics are The control system is complex and the installed capacity is super large. Digital switching power supply has irreplaceable advantages in these fields. The inverter power supply with digital power technology can track the phase of the power grid in real time, reducing the impact on the power grid caused by switching power supply, and realizing safer power supply switching. The charging system of solar and wind power stations uses digital power technology to...

AI Technical Summary

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 mainstream solutions in high-power digital power supply systems 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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