Quick response type load adjusting system of high-voltage MOSFET power supply

Abstract

The invention discloses a quick response type load adjusting system of a high-voltage MOSFET (Metal-Oxide-Semiconductor Field Effect Transistor) power supply. The quick response type load adjusting system is characterized by comprising a high-voltage MOSFET module; a high-precision current sensor; a data acquisition module; a digital signal processing module; a control algorithm module; a driving circuit module; a temperature monitoring module; and a communication interface. According to the invention, through a current feedback control algorithm and PID control, the system can monitor the output current in real time and rapidly adjust the on-off state of the MOSFET, and the response speed to the load change is significantly improved; the introduction of an adaptive adjustment algorithm enables the control system to dynamically optimize control parameters according to real-time data, thereby improving the control precision of the system, and ensuring that the output current is always close to a set value. Through real-time feedback and adjustment, the system can effectively suppress output current fluctuation caused by load fluctuation, so that the stability of the power supply system is enhanced, and the power supply fault risk is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of power management, and in particular to a fast-response load adjustment system for a high-voltage MOSFET power supply. Background Art

[0002] As modern electronic devices continue to demand efficient and stable power supplies, high-voltage MOSFETs (metal oxide semiconductor field effect transistors) are widely used in power conversion and load regulation as key components in power management. High-voltage MOSFETs have the advantages of low on-resistance, fast switching speed and high withstand voltage, so they are widely used in power converters, motor drives and high-frequency switching power supplies.

[0003] However, traditional high-voltage MOSFET control systems often have problems such as slow response speed and low control accuracy when facing load changes. Especially in dynamic load environments, the power supply system needs to adjust the output current in time to adapt to load changes and ensure stable operation of the equipment. In response to this, real-time current feedback control algorithms have emerged. It monitors the output current and compares it with the set value to generate corresponding control signals and dynamically adjust the switching state of the MOSFET.

[0004] Currently, PID control (proportional-integral-differential control) has become one of the commonly used methods in current feedback control. PID control calculates the error between the current output and the set target, and adjusts the system output in real time to achieve fast and stable feedback. However, traditional PID control may not be able to achieve a fast enough response when facing rapidly changing loads, resulting in the system being unable to adapt to load fluctuations in time. Therefore, PID control combined with adaptive adjustment algorithms has become an important development direction. The adaptive adjustment algorithm can optimize the control parameters in real time according to load changes, improving the response speed and stability of the system. Summary of the invention

[0005] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] In a first aspect, the present invention provides a fast response load adjustment system for a high voltage MOSFET power supply, comprising:

[0008] High-voltage MOSFET module: used to control the output of the power supply and adjust the current flow to the load according to the control signal;

[0009] High-precision current sensor: uses Hall effect sensor to monitor the current flowing through the load in real time;

[0010] Data acquisition module: integrated ADC, responsible for converting the analog signal output by the current sensor into a digital signal for subsequent processing;

[0011] Digital signal processing module: contains a microcontroller that executes the current feedback control algorithm and calculates the required control signals in real time;

[0012] Control algorithm module: implements PID control and adaptive adjustment algorithm, dynamically adjusts the switching state of MOSFET according to real-time current feedback to quickly respond to load changes;

[0013] Drive circuit module: controls the switching state of MOSFET, receives control signals from the digital signal processing unit, and ensures accurate output regulation;

[0014] Temperature monitoring module: monitors the temperature of MOSFET and other key components of the system, provides over-temperature protection function, and ensures safe operation of the system;

[0015] Communication interface: Provides an interface for connecting to external devices to facilitate data collection, storage and remote monitoring.

[0016] As a preferred solution of the fast response load adjustment system of the high-voltage MOSFET power supply described in the present invention, the current feedback control algorithm is specifically as follows:

[0017]

[0018] Among them, I out (t) is the function of output current changing with time; T is the time constant of the control cycle; K p , K i , K d are proportional, integral and differential gains, respectively, which are parameters for adjusting the system response; ΔI(t) is the error between the feedback current and the set current; is an exponential decay function, which is used to simulate the delay effect of system response, where τ is a time constant, reflecting the dynamic characteristics of the system.

[0019] As a preferred solution of the fast response type load adjustment system of the high voltage MOSFET power supply of the present invention, wherein: out The output current range of (t) is:

[0020] I out (t)∈[I set -ΔI max , I set+ΔI max ]

[0021] Among them I set Set current, ΔI max is the maximum error that the system can tolerate.

[0022] As a preferred solution of the fast response type load adjustment system of the high voltage MOSFET power supply of the present invention, wherein: out (t) The specific value range is as follows:

[0023] Normal operation range: Iut(t)≈I set , the error is small;

[0024] Slight overshoot range: I out (t)>I set , slightly exceeds the set value;

[0025] Severe overshoot interval: I out (t)>>I set , obviously exceeds the set value;

[0026] Below the set value range: I out (t) set , the output current is lower than the set value;

[0027] System unstable range: I out (t) The fluctuations are large, with large up and down swings.

[0028] As a preferred solution of the fast response load adjustment system of the high-voltage MOSFET power supply described in the present invention, the adjustment solution corresponding to the value range is as follows:

[0029] Normal operating range: Maintain the existing K p , K i , K d Parameters, monitor the current regularly to ensure the system operates within the normal range;

[0030] Slight overshoot range: Increase K d To enhance the suppression capability of the system, reduce overshoot, and appropriately reduce K p , place overreaction;

[0031] Severe overshoot range: significantly increase K d And reduce K p , increase the value of the integral time constant τ to reduce the system response speed and reduce the impact;

[0032] Below the set value range: Increase K p To quickly increase the output current, moderately increase K i , enhance the ability to correct steady-state errors;​

[0033] System unstable period: re-evaluate and adjust K p , K i , K d to achieve a more balanced feedback control.

[0034] As a preferred solution of the fast response type load adjustment system of the high voltage MOSFET power supply of the present invention, the specific method of controlling the switching state of the MOSFET is as follows:

[0035] According to the calculated I out (t), determine the difference between the target current and the current output current, and set the maximum output current I max With the minimum output current I min ;

[0036] According to I out (t), generates the duty cycle of the PWM signal, the size of the duty cycle is proportional to the required output current;

[0037] Use a dedicated MOSFET driver chip to convert the PWM signal into a control signal to drive the MOSFET;

[0038] When I out When (t) is lower than the set value, the PWM duty cycle is increased, so that the MOSFET is turned on for more time and the output current is increased. out When (t) is higher than the set value, the PWM duty cycle is reduced, making the MOSFET conduction less time and reducing the output current.

[0039] As a preferred solution of the fast response type load adjustment system of the high voltage MOSFET power supply of the present invention, the duty cycle calculation formula is as follows:

[0040]

[0041] Where D is the duty cycle of PWM.

[0042] In a second aspect, the present invention provides a fast response load adjustment method for a high voltage MOSFET power supply, specifically comprising:

[0043] S1. Determine the basic architecture of the high-voltage MOSFET power supply, including input power supply, MOSFET switch, load, control circuit and feedback mechanism;

[0044] S2. Select a suitable high-precision current sensor to ensure that it can work stably under high voltage conditions and has fast response characteristics, and install it to monitor the current flowing through the load in real time;

[0045] S3, collect data, read the signal output by the current sensor in real time, and convert it into a digital signal for subsequent processing;

[0046] S4, calculate through the current feedback algorithm to realize proportional-integral-differential control, so as to adjust the on-time of MOSFET according to the feedback current, and dynamically adjust the PID parameters according to the load change to improve the system response speed and stability;

[0047] S5. Add a temperature sensor to monitor the operating temperature of the MOSFET to prevent performance degradation due to overheating and limit the current when necessary.

[0048] In a third aspect, an embodiment of the present invention provides a computer device, comprising a memory and a processor, wherein the memory stores a computer program, wherein: when the computer program is executed by the processor, a fast response load adjustment system for a high-voltage MOSFET power supply as described in the first aspect of the present invention is implemented.

[0049] In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium having a computer program stored thereon, wherein: when the computer program is executed by a processor, it implements a fast-response load adjustment system for a high-voltage MOSFET power supply as described in the first aspect of the present invention.

[0050] Beneficial effects of the present invention:

[0051] Through current feedback control algorithm and PID control, the system can monitor the output current in real time and quickly adjust the switching state of MOSFET, significantly improving the response speed to load changes, which is particularly important for application scenarios that require high-frequency adjustment; the introduction of adaptive adjustment algorithm enables the control system to dynamically optimize control parameters according to real-time data, thereby improving the control accuracy of the system and ensuring that the output current is always close to the set value; through real-time feedback and adjustment, the system can effectively suppress output current fluctuations caused by load fluctuations, thereby enhancing the stability of the power supply system and reducing the risk of power supply failure; by accurately controlling the switching state of MOSFET, switching loss and conduction loss are reduced, the energy efficiency of the entire power supply system is improved, and the service life of the equipment is extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0053] Figure 1A system architecture diagram of a fast response load adjustment system for a high-voltage MOSFET power supply proposed by the present invention;

[0054] Figure 2 A method flow chart of a fast response load adjustment method for a high voltage MOSFET power supply proposed by the present invention;

[0055] Figure 3 It is a system flow chart of the partitioning and corresponding scheme of the current feedback calculation in the present invention. DETAILED DESCRIPTION

[0056] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0057] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0058] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0059] Reference Figure 1-3 The present invention provides a fast response load adjustment system for a high voltage MOSFET power supply, comprising:

[0060] High-voltage MOSFET module: used to control the output of the power supply and adjust the current flow to the load according to the control signal;

[0061] High-precision current sensor: uses Hall effect sensor to monitor the current flowing through the load in real time;

[0062] Data acquisition module: integrated ADC (analog-to-digital converter), responsible for converting the analog signal output by the current sensor into a digital signal for subsequent processing;

[0063] Digital signal processing module: contains a microcontroller that executes the current feedback control algorithm and calculates the required control signals in real time;

[0064] Control algorithm module: implements PID control and adaptive adjustment algorithm, dynamically adjusts the switching state of MOSFET according to real-time current feedback to quickly respond to load changes;

[0065] Drive circuit module: controls the switching state of MOSFET, receives control signals from the digital signal processing unit, and ensures accurate output regulation;

[0066] Temperature monitoring module: monitors the temperature of MOSFET and other key components of the system, provides over-temperature protection function, and ensures safe operation of the system;

[0067] Communication interface: Provides an interface for connecting to external devices to facilitate data collection, storage and remote monitoring.

[0068] Among them, the current feedback control algorithm is as follows:

[0069]

[0070] Among them, I out (t) is the function of output current changing with time; T is the time constant of the control cycle; J p , K i , K d are proportional, integral and differential gains, respectively, which are parameters for adjusting the system response; ΔI(t) is the error between the feedback current and the set current; is an exponential decay function, which is used to simulate the delay effect of system response, where τ is a time constant, reflecting the dynamic characteristics of the system, and is controlled by the proportional gain K p Amplify the current error to achieve instant response; through the integral gain K i Process past errors, correct steady-state deviations, and ensure long-term accuracy; through the differential gain K d Process the error change rate, reduce system overshoot, and improve system stability.

[0071] Furthermore, I out The output current range of (t) is:

[0072] I out (t)∈[I set -ΔI max , I set +ΔI max ]

[0073] Among them I set Set current, ΔI max is the maximum error that the system can tolerate.

[0074] Furthermore, I out (t) The specific value range is as follows:

[0075] Normal operating range: I out (t)≈I set , the error is small;

[0076] Slight overshoot range: Iout (t)>I set , slightly exceeds the set value;

[0077] Severe overshoot interval: I out (t)>>I set , obviously exceeds the set value;

[0078] Below the set value range: I out (t) set , the output current is lower than the set value;

[0079] System unstable range: I out (t) Fluctuates greatly, up and down, through I out The obtained value of (t) is used to distinguish them, and different adjustment plans are customized for different intervals.

[0080] Furthermore, the corresponding adjustment scheme of the value range is as follows:

[0081] Normal operating range: Maintain the existing K p , K i , K d Parameters, monitor the current regularly to ensure the system operates within the normal range;

[0082] Slight overshoot range: Increase K d To enhance the suppression capability of the system, reduce overshoot, and appropriately reduce K p , place overreaction;

[0083] Severe overshoot range: significantly increase K d And reduce K p , increase the value of the integral time constant τ to reduce the system response speed and reduce the impact;

[0084] Below the set value range: Increase K p To quickly increase the output current, moderately increase K i , enhance the ability to correct steady-state errors;

[0085] System unstable period: re-evaluate and adjust K p , K i , K d The initial value of can achieve a more balanced feedback control. Through the above corresponding adjustment scheme, the current feedback control system can be effectively adjusted under different operating conditions, thereby improving the stability and responsiveness of the system.

[0086] Furthermore, the specific method of controlling the switching state of MOSFET is as follows:

[0087] According to the calculated I out ​(t), determine the difference between the target current and the current output current, and set the maximum output current I max With the minimum output current I min ;

[0088] According to I out (t), generates the duty cycle of the PWM signal, the size of the duty cycle is proportional to the required output current;

[0089] Use a dedicated MOSFET driver chip to convert the PWM signal into a control signal to drive the MOSFET;

[0090] When I out When (t) is lower than the set value, the PWM duty cycle is increased, so that the MOSFET is turned on for more time and the output current is increased. out When (t) is higher than the set value, the PWM duty cycle is reduced to make the MOSFET conduct less time and reduce the output current. The above steps can effectively utilize the calculated I out (t) Adjust the switching state of the high-voltage MOSFET to achieve efficient and stable current control.

[0091] Furthermore, the duty cycle calculation formula is as follows:

[0092]

[0093] Where D is the duty cycle of PWM.

[0094] This embodiment also provides a fast response load adjustment method for a high voltage MOSFET power supply, which specifically includes:

[0095] S1. Determine the basic architecture of the high-voltage MOSFET power supply, including input power supply, MOSFET switch, load, control circuit and feedback mechanism;

[0096] S2. Select a suitable high-precision current sensor to ensure that it can work stably under high voltage conditions and has fast response characteristics, and install it to monitor the current flowing through the load in real time;

[0097] S3, collect data, read the signal output by the current sensor in real time, and convert it into a digital signal for subsequent processing;

[0098] S4, calculate through the current feedback algorithm to realize proportional-integral-differential control, so as to adjust the on-time of MOSFET according to the feedback current, and dynamically adjust the PID parameters according to the load change to improve the system response speed and stability;

[0099] S5. Add a temperature sensor to monitor the operating temperature of MOSFET to prevent performance degradation due to overheating, and limit the current when necessary. Through the above implementation steps, the current feedback mechanism can be effectively improved, and the accuracy of load adjustment can be improved by using high-precision current sensors, thereby enhancing the fast response performance of high-voltage MOSFET power supply.

[0100] This embodiment also provides a computer device, which is suitable for a fast-response load adjustment system for a high-voltage MOSFET power supply, including: a memory and a processor; the memory is used to store computer-executable instructions, and the processor is used to execute computer-executable instructions to implement a fast-response load adjustment system for a high-voltage MOSFET power supply as proposed in the above embodiment.

[0101] The computer device may be a terminal, and the computer device includes a processor, a memory, a communication interface, a display screen and an input device connected via a system bus. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The communication interface of the computer device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be achieved through WIFI, an operator network, NFC (near field communication) or other technologies. The display screen of the computer device may be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device may be a touch layer covering the display screen, or a key, trackball or touchpad provided on the housing of the computer device, or an external keyboard, touchpad or mouse, etc.

[0102] This embodiment also provides a storage medium on which a computer program is stored. When the program is executed by a processor, a fast response load adjustment system for a high-voltage MOSFET power supply is implemented as proposed in the above embodiment; the storage medium can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (Static Random Access Memory, referred to as SRAM), electrically erasable programmable read-only memory (Electrically Erasable Programmable Read-Only Memory, referred to as EEPROM), erasable programmable read-only memory (Erasable Programmable Read Only Memory, referred to as EPROM), programmable read-only memory (Programmable Red-Only Memory, referred to as PROM), read-only memory (Read-Only Memory, referred to as ROM), magnetic storage, flash memory, magnetic disk or optical disk.

[0103] In summary, the present invention uses a current feedback control algorithm and PID control, so that the system can monitor the output current in real time and quickly adjust the switching state of MOSFET, which significantly improves the response speed to load changes; at the same time, the introduction of the adaptive adjustment algorithm enables the control system to dynamically optimize the control parameters according to real-time data, thereby improving the control accuracy of the system and ensuring that the output current is always close to the set value, and through real-time feedback and adjustment, the system can effectively suppress the output current fluctuation caused by load fluctuations, thereby enhancing the stability of the power supply system and reducing the risk of power supply failure; by accurately controlling the switching state of MOSFET, the switching loss and conduction loss are reduced, the energy efficiency of the entire power supply system is improved, and the service life of the equipment is extended.

[0104] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A fast response load adjustment system for a high voltage MOSFET power supply, characterized in that: include: High-voltage MOSFET module: used to control the output of the power supply and adjust the current flow to the load according to the control signal; High-precision current sensor: uses Hall effect sensor to monitor the current flowing through the load in real time; Data acquisition module: integrated ADC, responsible for converting the analog signal output by the current sensor into a digital signal for subsequent processing; Digital signal processing module: contains a microcontroller that executes the current feedback control algorithm and calculates the required control signals in real time; Control algorithm module: implements PID control and adaptive adjustment algorithm, dynamically adjusts the switching state of MOSFET according to real-time current feedback to quickly respond to load changes; Drive circuit module: controls the switching state of MOSFET, receives control signals from the digital signal processing unit, and ensures accurate output regulation; Temperature monitoring module: monitors the temperature of MOSFET and other key components of the system, provides over-temperature protection function, and ensures safe operation of the system; Communication interface: Provides an interface for connecting to external devices to facilitate data collection, storage and remote monitoring.

2. The fast response load adjustment system of a high voltage MOSFET power supply according to claim 1, characterized in that: The current feedback control algorithm is as follows: Among them, I out (t) is the function of output current changing with time; T is the time constant of the control cycle; K p , K i , K d are proportional, integral and differential gains, respectively, which are parameters for adjusting the system response; ΔI(t) is the error between the feedback current and the set current; is an exponential decay function, which is used to simulate the delay effect of system response, where τ is a time constant, reflecting the dynamic characteristics of the system.

3. The fast response load adjustment system of a high voltage MOSFET power supply according to claim 2, characterized in that: I out The output current range of (t) is: I out (t)∈[I set -ΔI max ,I set +ΔI max ] Among them I set Set current, ΔI max is the maximum error that the system can tolerate.

4. The fast response load adjustment system of a high voltage MOSFET power supply according to claim 3, characterized in that: I out (t) The specific value range is as follows: Normal operating range: I out (t)≈I set , the error is small; Slight overshoot range: I out (t)>I set , slightly exceeds the set value; Severe overshoot interval: I out (t)>>I set , obviously exceeds the set value; Below the set value range: I out (t) set , the output current is lower than the set value;​ System unstable range: I out (t) The fluctuations are large, with large up and down swings.

5. The fast response load adjustment system of a high voltage MOSFET power supply according to claim 4, characterized in that: The corresponding adjustment scheme of the value range is as follows: Normal operating range: Maintain the existing K p , K i , K d Parameters, monitor the current regularly to ensure the system operates within the normal range; Slight overshoot range: Increase K d To enhance the suppression capability of the system, reduce overshoot, and appropriately reduce K p , place overreaction; Severe overshoot range: significantly increase K d And reduce K p , increase the value of the integral time constant τ to reduce the system response speed and reduce the impact; Below the set value range: Increase K p To quickly increase the output current, moderately increase K i , enhance the ability to correct steady-state errors; System unstable period: re-evaluate and adjust K p , K i , K d to achieve a more balanced feedback control.

6. The fast response load adjustment system of a high voltage MOSFET power supply according to claim 5, characterized in that: The specific method of controlling the switching state of the MOSFET is as follows: According to the calculated I out (t), determine the difference between the target current and the current output current, and set the maximum output current I max With the minimum output current I min ; According to I out (t), generates the duty cycle of the PWM signal, the size of the duty cycle is proportional to the required output current; Use a dedicated MOSFET driver chip to convert the PWM signal into a control signal to drive the MOSFET; When I out When (t) is lower than the set value, the PWM duty cycle is increased, so that the MOSFET is turned on for more time and the output current is increased. out When (t) is higher than the set value, the PWM duty cycle is reduced, making the MOSFET conduction less time and reducing the output current.

7. The fast response load adjustment system of a high voltage MOSFET power supply according to claim 6, characterized in that: The duty cycle calculation formula is as follows: Where D is the duty cycle of PWM.

8. A fast response type load adjustment method for a high voltage MOSFET power supply, based on a fast response type load adjustment system for a high voltage MOSFET power supply according to any one of claims 1 to 7, characterized in that: Specifically include: S1. Determine the basic architecture of the high-voltage MOSFET power supply, including input power supply, MOSFET switch, load, control circuit and feedback mechanism; S2. Select a suitable high-precision current sensor to ensure that it can work stably under high voltage conditions and has fast response characteristics, and install it to monitor the current flowing through the load in real time; S3, collect data, read the signal output by the current sensor in real time, and convert it into a digital signal for subsequent processing; S4, calculate through the current feedback algorithm to realize proportional-integral-differential control, so as to adjust the on-time of MOSFET according to the feedback current, and dynamically adjust the PID parameters according to the load change to improve the system response speed and stability; S5. Add a temperature sensor to monitor the operating temperature of the MOSFET to prevent performance degradation due to overheating and limit the current when necessary.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the fast-response load adjustment system for a high-voltage MOSFET power supply according to any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, a fast-response load adjustment system for a high-voltage MOSFET power supply according to any one of claims 1 to 7 is implemented.

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