CN-121984328-A - High-power low-ripple high-efficiency hybrid structure linear power supply and working method thereof

CN121984328ACN 121984328 ACN121984328 ACN 121984328ACN-121984328-A

Abstract

The application discloses a high-power low-ripple high-efficiency hybrid structure linear power supply and a working method thereof, relating to the technical field of electronics; the power amplifier comprises a reference source module, a power operational amplifier module, a MOS tube linear voltage regulation module, a voltage and power judgment module, a first switch module and a second switch module, wherein the first switch module and the second switch module are used for gating the power operational amplifier module or the MOS tube linear voltage regulation module. The reference source module is used as a reference circuit and used for outputting a reference voltage signal to a common end of the first switch module, and the reference voltage signal is controlled by the first switch module to be output to the power operational amplifier module or the MOS tube linear voltage regulating module. The application realizes the dynamic selection of the optimal working mode in the full power range, has the output characteristics of high precision, low ripple and high efficiency, effectively improves the overall energy efficiency and practicability of the power supply, can obviously reduce the power consumption and the temperature rise of the adjusting tube during the output of high power or low pressure difference, ensures the long-term operation reliability of the power supply and simplifies the heat dissipation design.

Inventors

DENG ERPING
LV JINPENG
WU LIXIN
ZHANG YONGKANG
CAO ZIJIAN

Assignees

合肥工业大学

Dates

Publication Date: 20260505
Application Date: 20251226

Claims (10)

1. A high power low ripple high efficiency hybrid structure linear power supply comprising: The reference source module is used for outputting a reference voltage signal to the common end of the first switch module; The input end of the power operational amplifier module is electrically connected with the first throw end of the first switch module, and the output end of the power operational amplifier module is electrically connected with the first throw end of the second switch module and is used for processing the reference voltage signal and outputting a processed low-voltage signal; The MOS tube linear voltage regulating module is characterized in that an input end of the MOS tube linear voltage regulating module is electrically connected with a second throw end of the first switch module, and an output end of the MOS tube linear voltage regulating module is electrically connected with the second throw end of the second switch module and is used for processing the reference voltage signal and outputting a processed high-voltage signal; The input end of the voltage and power judging module is electrically connected with two ends of the load to measure the load voltage and the load current, real-time output power is determined according to the load voltage and the load current, and the first switch module and the second switch module are controlled to be communicated with the power operational amplifier module or the MOS tube linear voltage regulating module according to the real-time output power; The first switch module and the second switch module are communicated with the MOS tube linear voltage regulating module in an initial state.
2. The high power low ripple high efficiency hybrid structure linear power supply of claim 1, wherein the reference source module comprises: a DAC unit for outputting an initial reference voltage signal; The input end of the voltage dividing network is electrically connected with the output end of the DAC unit and is used for scaling the initial reference voltage signal; and the input end of the first instrument amplifier is electrically connected with the output end of the voltage dividing network and is used for filtering the scaled initial reference voltage signal to output the reference voltage signal to the common end of the first switch module.
3. The high power low ripple high efficiency hybrid structure linear power supply of claim 2, wherein the reference source module further comprises: And the input end of the Butterworth low-pass filter is electrically connected with the output end of the first instrument amplifier, and is used for filtering the signal amplified by the first instrument amplifier to obtain a reference voltage signal and outputting the reference voltage signal to the common end of the first switch module.
4. A high power low ripple high efficiency hybrid structure linear power supply according to claim 3 wherein the butterworth low pass filter has a cut-off frequency of 300Hz and a stop band frequency of 100Khz.
5. The high power low ripple high efficiency hybrid structure linear power supply of claim 1, wherein the power op-amp module comprises an OPA549 op-amp having a forward input electrically connected to the first throw of the first switch module, a reverse input electrically connected to the first throw of the second switch module, and an output electrically connected to the first throw of the second switch module.
6. The high-power low-ripple high-efficiency hybrid structure linear power supply of claim 1, wherein the MOS transistor linear voltage regulation module comprises: the positive input end of the precise operational amplifier unit is electrically connected with the second throw end of the first switch module, and the reverse input end of the precise operational amplifier unit is electrically connected with the second throw end of the second switch module; and the base electrode of the power push-pull unit is electrically connected with the output end of the precise operational amplifier unit through a resistor, the collector electrodes of the power push-pull unit are respectively electrically connected with a power supply, and the emitting electrodes of the power push-pull unit are electrically connected with the second throwing end of the second switch module.
7. The high power low ripple high efficiency hybrid structure linear power supply of claim 6, wherein said precision op-amp unit comprises: the forward input end of the second instrument amplifier is electrically connected with the second throw end of the first switch module, the reverse input end of the second instrument amplifier is electrically connected with the second throw end of the second switch module, and the output end of the second instrument amplifier outputs a conditioning signal; And the input end of the first operational amplifier is electrically connected with the output end of the second instrument amplifier, and is used for amplifying the conditioning signal and outputting the conditioning signal to the base electrode of the power push-pull unit.
8. The high power low ripple high efficiency hybrid structure linear power supply of claim 1, wherein said voltage and power determination module comprises a second operational amplifier unit, an analog multiplier unit, and a voltage comparator unit connected in series in sequence, wherein: the second operational amplifier unit is used for amplifying the load voltage and the load current; the analog multiplier unit is used for analog multiplication of the instantaneous power value and outputting proportional voltage proportional to the real-time power of the load; the voltage comparator unit is used for comparing the proportional voltage with a preset switching threshold value and outputting digital level signals for controlling the first switch module and the second switch module.
9. The high power low ripple high efficiency hybrid structure linear power supply of claim 1, wherein the voltage and power determination module comprises: an ADC unit for collecting the load voltage and the load current; and the MCU is used for performing digital multiplication operation according to the load voltage and the load current to obtain real-time output power, and controlling the first switch module and the second switch module to be communicated with the power operational amplifier module or the MOS tube linear voltage regulating module according to the real-time output power.
10. The working method of the high-power low-ripple high-efficiency hybrid structure linear power supply is characterized by being applied to the high-power low-ripple high-efficiency hybrid structure linear power supply described in any one of 1-9, and the method comprises the following steps: outputting a reference voltage signal to a common end of a first switch module, wherein in an initial stage of load access, the first switch module and the second switch module are communicated with a MOS tube linear voltage regulating module; The method comprises the steps of monitoring load voltage and load current in real time to obtain load power, judging with a preset threshold, and controlling the first switch module and the second switch module to be communicated with a MOS tube linear voltage regulation module when the load power is higher than the preset threshold; and when the load power is lower than the preset threshold value, controlling the first switch module and the second switch module to be communicated with a power operational amplifier module.

Description

High-power low-ripple high-efficiency hybrid structure linear power supply and working method thereof Technical Field The application relates to the technical field of power electronics, in particular to a high-power low-ripple high-efficiency hybrid structure linear power supply. Background In modern electronic systems, linear power supplies are used as key basic power supply units, and are widely used in fields with extremely high requirements on power quality, such as precision measurement instruments, medical electronic equipment, audio processing systems, communication base stations, laboratory test equipment, industrial automation control and the like. These application scenarios often require that the power supply have low noise, high stability, and high precision output characteristics, so as to ensure normal operation of the sensitive circuit or element, and avoid signal distortion, measurement error, or system performance degradation caused by power supply ripple, noise, or voltage fluctuation. However, with the development of electronic devices toward high performance and high integration, the power supply system needs to meet not only low ripple and high precision output requirements, but also challenges of wide voltage current output range, high power density and energy efficiency management, which provides a serious test for traditional linear power supply architecture. Therefore, a linear power supply solution that can intelligently adapt to load changes and that combines low ripple with high efficiency over a wide voltage-current range is needed to meet the comprehensive demands of modern electronic systems for power performance, energy efficiency and reliability. Disclosure of Invention The application aims to at least solve the problems that the traditional linear power supply in the prior art cannot achieve low ripple and high efficiency in a wide voltage current output range and serious heating is caused by overlarge power consumption of the adjusting tube in low voltage and high current output, dynamically select an optimal working mode in a full power range, have the output characteristics of high precision, low ripple and high efficiency, effectively improve the overall energy efficiency and practicability of the power supply, obviously reduce the power consumption and the temperature rise of the adjusting tube in high power or low voltage difference output, ensure the long-term operation reliability of the power supply and simplify the heat dissipation design. The exemplary embodiment of the present application is implemented as follows. The first aspect of the present application provides a high power low ripple high efficiency hybrid structure linear power supply comprising: The reference source module is used for outputting a reference voltage signal to the common end of the first switch module; The input end of the power operational amplifier module is electrically connected with the first throw end of the first switch module, and the output end of the power operational amplifier module is electrically connected with the first throw end of the second switch module and is used for processing the reference voltage signal and outputting a processed low-voltage signal; The MOS tube linear voltage regulating module is characterized in that an input end of the MOS tube linear voltage regulating module is electrically connected with a second throw end of the first switch module, and an output end of the MOS tube linear voltage regulating module is electrically connected with the second throw end of the second switch module and is used for processing the reference voltage signal and outputting a processed high-voltage signal; The input end of the voltage and power judging module is electrically connected with two ends of the load to measure the load voltage and the load current, real-time output power is determined according to the load voltage and the load current, and the first switch module and the second switch module are controlled to be communicated with the power operational amplifier module or the MOS tube linear voltage regulating module according to the real-time output power; The first switch module and the second switch module are communicated with the MOS tube linear voltage regulating module in an initial state. The system has the advantages of time-sharing multiplexing of the two topologies (a path formed by connecting power operational amplifier modules or MOS tube linear voltage regulating modules) in a time dimension, dynamic selection of an optimal working mode in a full power range is realized, dynamic optimization of output performance in the full power range is ensured, high-precision clean output of a low-millivolt level can be provided, high-power loads of hundreds of watts can be carried efficiently, the system has the output characteristics of high precision, low ripple and high efficiency, the overall energy efficiency and the practicability of a power supply a