CN114499175A - Power supply control method and system - Google Patents
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- CN114499175A CN114499175A CN202210164653.8A CN202210164653A CN114499175A CN 114499175 A CN114499175 A CN 114499175A CN 202210164653 A CN202210164653 A CN 202210164653A CN 114499175 A CN114499175 A CN 114499175A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
Abstract
The invention provides a power supply control method and system, and relates to the field of circuit control. A power supply control method, comprising the steps of: load current is collected through a control circuit of the switch conversion circuit, and positive feedback control is carried out on the inductive current of the switch conversion circuit by adopting the load current. In addition, the invention also provides a power supply control system, which comprises a switch conversion circuit, a control circuit and a sampling circuit, wherein the sampling circuit is used for sampling the inductive current, the capacitive voltage and the load current/load voltage of the control circuit, and the inductive current, the capacitive voltage and the load current/load voltage are calculated by a PI controller and then output PWM to drive the switch conversion circuit. The invention realizes the rapid feedback of the load fluctuation by adding the link of changing the positive feedback of the current by the load.
Description
Technical Field
The invention relates to the field of circuit control, in particular to a power supply control method and system.
Background
The research and development work of China on the triode direct-current converter and the switching power supply starts in the initial stage of the 60 s, enters the practical stage in the middle stage of the 60 s, and starts to research the switching power supply of the non-power-frequency transformer immediately after the initial stage of the 70 s. In 1974, a non-power frequency switching power supply with the working frequency of 10 kilohertz and the output voltage of 5v was successfully developed. In recent 30 years, many research institutes, factories and colleges have developed various types of switching power supplies, and the switching power supplies are widely applied to many aspects such as electronic computers, communication, household appliances and the like, and have good effects.
The core of the switching power supply is a high-frequency switching conversion circuit and a pulse control circuit. The high frequency conversion circuit converts a direct current input into a high frequency pulse output voltage average value. The pulse control circuit controls the on-time and the off-time of the high-frequency switching tube according to the feedback voltage, so as to achieve the purpose of controlling the output voltage. The isolation circuit adopts a high-frequency conversion device and a high-frequency isolation transformer. the switching power supply generally adopts two modulation modes of pulse width modulation and mixed modulation, which can be divided into: (1) pulse width modulation type: the oscillation frequency is kept constant, and the magnitude of the output voltage is changed and adjusted by changing the width of the pulse. The output voltage is stabilized by a closed loop formed by a sampling circuit and a coupling circuit, and the short term is PWM (pulse width modulation). (2) Frequency modulation type: the duty cycle is kept constant or the off-time is kept constant, and the frequency of the oscillator is changed to stabilize and regulate the output voltage amplitude, abbreviated PFM (pulse frequency modulation). (3) Mixed preparation type: and stabilizing and outputting the voltage amplitude by adjusting the oscillation frequency of the conduction time. In pulse width modulation, because the frequency is not changed, the test and design of magnetic elements and transistors in the circuit are convenient, and the suppression of radio frequency interference is easier, so that the pulse width modulation is widely applied.
At present, CN201810742941.0, "switching power supply control circuit and switching power supply" discloses a switching power supply control circuit and a switching power supply, which includes an error amplifier and a slope compensation circuit. The invention improves the variation range of the peak value of the inductive current by adjusting the starting point of the ramp signal. In patent CN201822177672.6 "a switching power supply control mode switching circuit and switching power supply chip", a switching power supply control mode switching circuit and a switching power supply chip are provided, the switching power supply control mode switching circuit is used for generating a driving signal; the device comprises a mode switching threshold generation module, a negative feedback loop control module and a driving signal generation module, and achieves the purpose of stably controlling the mode switching threshold. Patent CN201921494799.9 "switching power supply control circuit and switching power supply system for improving dynamic performance" discloses a switching power supply control circuit and switching power supply system for improving dynamic performance, which can monitor the peak current of the switching power supply in real time, and when it is detected that the number of cycles of the first type of peak current continuously appears reaches the preset threshold number, the system is considered to be in a switching dynamic mode of switching from light load to heavy load, so as to optimize the dynamic response performance. CN201822177503.2 patent CN201822177503.2 "a switching power supply control mode switching circuit and switching power supply chip" provides a switching power supply control mode switching circuit and a switching power supply chip, wherein the switching power supply control mode switching circuit is used for generating a driving signal for controlling a power driving tube in a switching power supply; the device comprises a mode switching threshold generation module, a negative feedback loop control module and a driving signal generation module; the mode switching threshold generation module includes: a current source, an equivalent variable resistor and an operational amplifier; the purpose of stably controlling the mode switching threshold value can be achieved. Patent CN201910848851.4 "switching power supply control circuit and method and switching power supply system for improving dynamic performance" discloses a switching power supply control circuit and method and switching power supply system for improving dynamic performance, which can monitor the peak current of the switching power supply in real time, and when it is detected that the number of cycles of the first kind of peak current continuously appears reaches the preset threshold number, the system is considered to be in a switching dynamic mode of switching from light load to heavy load, and at this time, the first kind of peak current is immediately switched to the second kind of peak current, thereby optimizing the dynamic response performance. However, the conventional methods cannot meet the requirement of rapid feedback of load fluctuation, and therefore, a power supply control method and system are needed to be designed to solve the above problems.
Disclosure of Invention
The invention aims to provide a power supply control method, which realizes rapid feedback of load fluctuation by adding a load change current positive feedback link.
Another object of the present invention is to provide a power control system, which can realize rapid feedback of load fluctuation by adding a load change current positive feedback link.
The embodiment of the invention is realized by the following steps:
in a first aspect, an embodiment of the present application provides a power control method, which includes the following steps: load current is collected through a control circuit of the switch conversion circuit, and positive feedback control is carried out on the inductive current of the switch conversion circuit by adopting the load current.
In some embodiments of the present invention, the load current is a plurality of current values and/or voltage values, and the plurality of current values and/or voltage values are calculated by a PI controller and then output PWM to drive the switching converter circuit.
In some embodiments of the present invention, the step of acquiring a plurality of current values and/or voltage values specifically comprises the steps of: and collecting an inductive current according to the inductor of the switch conversion circuit, collecting a capacitor voltage according to the capacitor of the switch conversion circuit, and collecting a load current according to the load of the switch conversion circuit.
In some embodiments of the present invention, the collecting of the plurality of current values and/or voltage values specifically comprises the steps of: collecting inductance current according to the inductance of the switch conversion circuit, collecting capacitance voltage according to the capacitance of the switch conversion circuit, and collecting load voltage according to the load of the switch conversion circuit.
In some embodiments of the present invention, the control circuit of the switching converter circuit includes a control section, a comparison amplification section, and a pulse width modulation section.
In some embodiments of the present invention, the switch converter circuit has a buck circuit topology.
In some embodiments of the present invention, the output voltage of the switching converter circuit is lower than the input voltage.
In some embodiments of the present invention, the input current of the switching converter circuit is a pulsating current.
In some embodiments of the present invention, the output current of the switching converter circuit is a continuous current.
In a second aspect, an embodiment of the present application provides a power control system, which includes a switching converter circuit, a control circuit, and a sampling circuit, where the sampling circuit is configured to sample an inductive current, a capacitive voltage, and a load current/load voltage of the control circuit, and the inductive current, the capacitive voltage, and the load current/load voltage are calculated by a PI controller and then output a PWM to drive the switching converter circuit.
Compared with the prior art, the embodiment of the invention has at least the following advantages or beneficial effects:
in a first aspect, an embodiment of the present application provides a power control method, which includes the following steps: load current is collected through a control circuit of the switch conversion circuit, and positive feedback control is carried out on the inductive current of the switch conversion circuit by adopting the load current.
With respect to the first aspect: after a specific power supply voltage is input, the output voltage of the power supply is reduced due to the load added to the switching conversion circuit, and the traditional method is to feed back the inductive current and the voltage value acquired by the switching conversion circuit to the controller, so that signal lag is caused. According to the method and the device, the current value flowing through the current load at the voltage load is collected to directly participate in positive feedback control, the hysteresis error during signal feedback is solved, and the rapidity of reference voltage regulation is improved. The embodiment of the application increases the load in the control loop to sample the current, thereby directly feeding back, realizing the rapid adjustment of the output voltage, being stable and reliable, being suitable for the switching power supply with fluctuating load, and having the advantages of small power consumption, small volume and high efficiency.
In a second aspect, an embodiment of the present application provides a power control system, which includes a switching converter circuit, a control circuit, and a sampling circuit, where the sampling circuit is configured to sample an inductive current, a capacitive voltage, and a load current/load voltage of the control circuit, and the inductive current, the capacitive voltage, and the load current/load voltage are calculated by a PI controller and then output a PWM to drive the switching converter circuit.
With respect to the second aspect: after a specific power supply voltage is input, the output voltage of the power supply is reduced due to the load added to the switching conversion circuit, and the traditional method is to feed back the inductive current and the voltage value acquired by the switching conversion circuit to the controller, so that signal lag is caused. According to the method and the device, the current value flowing through the current load at the voltage load is collected to directly participate in positive feedback control, the hysteresis error during signal feedback is solved, and the rapidity of reference voltage regulation is improved; the voltage and current sampling at the buck circuit and the current or voltage sampling at the load are fed back to the PI controller and directly participate in the PI operation of the current loop, and after comparison and amplification, the pulse modulation circuit improves the duty ratio according to the error, so that the output voltage is increased, the switch conversion circuit is controlled to adjust the voltage output to the load, and the stability of the output voltage is further improved. The embodiment of the application increases the load in the control loop to sample the current, thereby directly feeding back, realizing the rapid adjustment of the output voltage, being stable and reliable, being suitable for the switching power supply with fluctuating load, and having the advantages of small power consumption, small volume and high efficiency.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic diagram of embodiments 1 to 2 of the present invention;
FIG. 2 is a schematic diagram of a switching converter circuit according to embodiments 1-2 of the present invention;
FIG. 3 is a schematic diagram of a control circuit of a current mode controller according to embodiments 1-2 of the present invention;
FIG. 4 is a schematic diagram of a control circuit of a voltage type controller according to embodiments 1-2 of the present invention;
FIG. 5 is a schematic diagram of an example of a fast response closed loop boost converter according to embodiments 1-2 of the present invention;
FIG. 6 is a schematic diagram of voltage output AC ripple without positive feedback of load current according to embodiments 1-2 of the present invention;
fig. 7 is a schematic diagram of voltage output ac ripples with load current positive feedback according to embodiments 1 to 2 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. The embodiments described below and the individual features of the embodiments can be combined with one another without conflict.
Example 1
Referring to fig. 1 to 4, fig. 1 to 4 are schematic flow charts of a power control method according to an embodiment of the present disclosure. The power supply control method comprises the following steps: load current is collected through a control circuit of the switch conversion circuit, and the load current is adopted to carry out positive feedback control on the inductive current of the switch conversion circuit.
In some embodiments of the present invention, the load current is a plurality of current values and/or voltage values, and the plurality of current values and/or voltage values are calculated by a PI controller and then output PWM to drive the switching converter circuit.
In some embodiments of the present invention, the step of acquiring a plurality of current values and/or voltage values specifically comprises the steps of: and collecting an inductive current according to the inductor of the switch conversion circuit, collecting a capacitor voltage according to the capacitor of the switch conversion circuit, and collecting a load current according to the load of the switch conversion circuit.
In some embodiments of the present invention, the collecting of the plurality of current values and/or voltage values specifically comprises the steps of: the method comprises the steps of collecting an inductive current according to an inductor of the switch conversion circuit, collecting a capacitor voltage according to a capacitor of the switch conversion circuit, and collecting a load voltage according to a load of the switch conversion circuit.
In some embodiments of the present invention, the control circuit of the switching converter circuit includes a control section, a comparison amplification section, and a pulse width modulation section.
In some embodiments of the present invention, the switch converter circuit has a buck circuit topology.
In some embodiments of the present invention, the output voltage of the switching converter circuit is lower than the input voltage.
In some embodiments of the present invention, the input current of the switching converter circuit is a pulsating current.
In some embodiments of the present invention, the output current of the switching converter circuit is a continuous current.
The invention is suitable for high-voltage power grids or other electric topological structures or occasions which need stable power supplies and have frequent load change. After the mains supply is rectified and filtered, one path of voltage is used as a working power supply of the single chip microcomputer, and the other path of voltage is directly used as an input voltage of the switch conversion circuit. The singlechip acquires information according to an input value required by a power grid, voltage and current information at the buck circuit and voltage and current of a load, calculates a difference value, modifies a pulse duty ratio, and outputs and controls the power switch tube so as to obtain an expected output voltage value, thereby achieving the purpose of quickly adjusting the output voltage.
Assuming that in a certain normal state, the output is V0, the feedback voltage is Vf, the user sets the voltage to Vs, when Vf = Vs, the deviation is 0, the single chip does not perform pulse width updating, when the output increases due to grid fluctuation, i.e., V0> Vs, the voltage sampled by the single chip also increases, the single chip modifies the duty ratio according to the deviation to reduce the on-time, thereby decreasing the voltage, and similarly, when the output voltage decreases due to grid fluctuation, i.e., V0< Vs, the single chip modifies the pulse width to increase the on-time, thereby increasing the output voltage, and the cycle is repeated to perform voltage stabilization.
The invention optimizes and improves the feedback aspect in practical application, and generates an occasion which is rapid in adjustment, simple and reliable, and is suitable for occasions with frequent load change and higher requirements on reference voltage. Through parameter selection of withstand voltage, capacitance value and resistance value of basic elements such as a resistor and a capacitor and model parameter selection of an operational amplifier, the voltage source controller can be suitable for various occasions, and the speed of the voltage source controller is far superior to that of a voltage source controller used in the market.
For the switching current stabilizing power supply: the method can form a control loop of load voltage inner loop positive feedback current outer loop negative feedback, and the reaction speed caused by the method is also superior to that of a current source controller used in the market.
Fig. 5 is a schematic diagram of an example fast response closed loop boost converter, which outputs load current through a sampling voltage source and directly controls input inductor current as positive feedback. The PID regulator independent of the voltage control loop can perform rapid and stable control on the load.
FIG. 6 shows the conventional voltage source of FIG. 5 without the positive feedback compensation, which simulates closed-loop AC ripple when the pulse load is switched instantaneously between 0.1A and 10A (10W to 1 kW). The vertical axis 2V/Div, plus the high frequency AC ripple, has a ripple not less than 11Vp-p, and has poor interference and stability.
Fig. 7 is a voltage source with positive feedback compensation according to the example of fig. 5, simulating closed loop ac ripple when the pulsed load is switched instantaneously from 0.1A to 10A (10W to 1 kW). The vertical axis is 2V/Div, the ripple wave less than or equal to 1.5Vp-p is mainly unavoidable high-frequency alternating current ripple wave, and the interference and the stability are very good.
The power supply control method comprises a switch conversion circuit, a control circuit and a sampling circuit. The control circuit comprises a control part, a comparison amplifying part and a pulse width adjusting part. The switching converter circuit uses a typical buck circuit topology. The sampling circuit is used for sampling the voltage and the current of the buck circuit and sampling the current or the voltage of the load. In detail, a current sampling part of a load is added in a control loop and fed back to a PI controller, so that the output voltage is quickly regulated, and the stability is further improved. The provided power supply voltage is set to be a fixed value, the power supply output voltage is reduced due to the addition of the load, the current value flowing through the current load at the voltage load is collected to directly participate in the PI operation of the current loop, and after the control loop is used for comparison and amplification, the pulse modulation circuit improves the duty ratio according to the error so that the output voltage is increased, the stability of the output voltage is controlled, and the regulation of the reference voltage can be accelerated at the same time. Load current is collected through a control circuit of the switch conversion circuit, and the inductive current can be quickly controlled by adopting direct load feedback. When the control loop is provided with a current type controller, the positive feedback control is carried out on the inductive current to form a control loop with the load current inner loop positive feedback and the voltage outer loop negative feedback. When the power supply is used for a switch voltage stabilization type power supply, a control loop of load voltage inner loop positive feedback and current outer loop negative feedback is formed. Direct load feedback is adopted to directly and rapidly control the inductive current, and the optimal dynamic response can be obtained to the maximum extent.
In the switch conversion circuit, when the PWM wave is at a high level, the energy storage inductor is magnetized, the current flowing through the inductor is linearly increased, and meanwhile, the capacitor is charged to provide energy for the load. When the PWM wave is at a low level, the energy storage inductor discharges through the freewheeling diode, the inductor current decreases linearly, and the output voltage is maintained by the discharge of the output filter capacitor and the reduced inductor current.
In the control circuit, the voltage and current information of the switch conversion circuit and the voltage and current information of the load are fed back, and the positive feedback of the output load current is increased in the current feedback link, so that when the load is suddenly loaded or unloaded, the current loop can quickly feed back to compensate the load current, and the output voltage of the switch power supply is quickly stabilized.
The embodiment of the application can generate a simple and reliable reference voltage application environment with frequent load change, and the reference voltage self-regulation capability is rapidly improved.
Example 2
Referring to fig. 2, an embodiment of the present application provides a power control system based on the power control method of embodiment 1, which includes a switch conversion circuit, a control circuit, and a sampling circuit, where the sampling circuit is configured to sample an inductive current, a capacitive voltage, and a load current/load voltage of the control circuit, and the inductive current, the capacitive voltage, and the load current/load voltage are calculated by a PI controller and then output a PWM to drive the switch conversion circuit.
The principle of the embodiment of the present application is the same as that of embodiment 1, and a repeated description thereof will not be provided.
It will be appreciated that the configuration shown in fig. 1 is merely illustrative and that the power control system may also include more or fewer components than shown in fig. 1 or have a different configuration than shown in fig. 1. The components shown in fig. 1 may be implemented in hardware, software, or a combination thereof.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other manners. The apparatus embodiments described above are merely illustrative, and for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, functional modules in the embodiments of the present application may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
To sum up, the embodiment of the present application provides a power control method and system:
after a specific power supply voltage is input, the output voltage of the power supply is reduced due to the load added to the switching conversion circuit, and the traditional method is to feed back the inductive current and the voltage value acquired by the switching conversion circuit to the controller, so that signal lag is caused. According to the method and the device, the current value flowing through the current load at the voltage load is collected to directly participate in positive feedback control, the hysteresis error during signal feedback is solved, and the rapidity of reference voltage regulation is improved; the voltage and current sampling at the buck circuit and the current or voltage sampling at the load are fed back to the PI controller and directly participate in the PI operation of the current loop, and after comparison and amplification, the pulse modulation circuit improves the duty ratio according to the error, so that the output voltage is increased, the switch conversion circuit is controlled to adjust the voltage output to the load, and the stability of the output voltage is further improved. The embodiment of the application increases the load in the control loop to sample the current, thereby directly feeding back, realizing the rapid adjustment of the output voltage, being stable and reliable, being suitable for the switching power supply with fluctuating load, and having the advantages of small power consumption, small volume and high efficiency.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
It will be evident to those skilled in the art that the present application is not limited to the details of the foregoing illustrative embodiments, and that the present application may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (10)
1. A power supply control method is characterized by comprising the following steps: the load current is collected through a control circuit of the switch conversion circuit, and the load current is adopted to carry out positive feedback control on the inductive current of the switch conversion circuit.
2. The power control method of claim 1, wherein the load current is a plurality of current values and/or voltage values, and the plurality of current values and/or voltage values are calculated by a PI controller and then output PWM to drive the switching converter circuit.
3. The power control method according to claim 2, wherein the step of collecting a plurality of current values and/or voltage values comprises the steps of: and acquiring an inductive current according to the inductor of the switch conversion circuit, acquiring a capacitor voltage according to the capacitor of the switch conversion circuit, and acquiring a load current according to the load of the switch conversion circuit.
4. The power control method according to claim 2, wherein the step of collecting a plurality of current values and/or voltage values comprises the steps of: and acquiring inductive current according to the inductor of the switch conversion circuit, acquiring capacitor voltage according to the capacitor of the switch conversion circuit, and acquiring load voltage according to the load of the switch conversion circuit.
5. The power supply control method according to claim 1, wherein the control circuit of the switching converter circuit includes a control section, a comparison amplification section, and a pulse width modulation section.
6. The power control method of claim 1, wherein the switching converter circuit is a buck circuit topology.
7. The power control method of claim 1, wherein the output voltage of the switching converter circuit is lower than the input voltage.
8. The power control method of claim 1, wherein the input current of the switching converter circuit is a pulsating current.
9. The power control method of claim 1, wherein the output current of the switching converter circuit is a continuous current.
10. A power control system is characterized by comprising a switch conversion circuit, a control circuit and a sampling circuit, wherein the sampling circuit is used for sampling inductive current, capacitive voltage and load current/load voltage of the control circuit, and the inductive current, the capacitive voltage and the load current/load voltage are calculated by a PI controller and then output PWM to drive the switch conversion circuit.
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| CN111725988A (en) * | 2020-06-08 | 2020-09-29 | 南京航空航天大学 | Load current feedforward control method based on single-cycle control and PFC controller |
| CN112671226A (en) * | 2021-03-22 | 2021-04-16 | 宜宾听点科技有限公司 | Power amplifier power supply voltage control method and system |
| CN113411002A (en) * | 2021-05-14 | 2021-09-17 | 杭州电子科技大学 | Single-phase inverter control system and method based on sliding mode variable structure of extreme learning machine |
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2022
- 2022-02-23 CN CN202210164653.8A patent/CN114499175A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111725988A (en) * | 2020-06-08 | 2020-09-29 | 南京航空航天大学 | Load current feedforward control method based on single-cycle control and PFC controller |
| CN112671226A (en) * | 2021-03-22 | 2021-04-16 | 宜宾听点科技有限公司 | Power amplifier power supply voltage control method and system |
| CN113411002A (en) * | 2021-05-14 | 2021-09-17 | 杭州电子科技大学 | Single-phase inverter control system and method based on sliding mode variable structure of extreme learning machine |
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