CN113206603A - Load power control method, control device, storage medium, and power management system - Google Patents
Load power control method, control device, storage medium, and power management system Download PDFInfo
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- CN113206603A CN113206603A CN202110508614.0A CN202110508614A CN113206603A CN 113206603 A CN113206603 A CN 113206603A CN 202110508614 A CN202110508614 A CN 202110508614A CN 113206603 A CN113206603 A CN 113206603A
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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
- H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
- H02M7/02—Conversion of AC power input into DC power output without possibility of reversal
- H02M7/04—Conversion of AC power input into DC power output without possibility of reversal by static converters
- H02M7/12—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/145—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
- H02M7/155—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
- H02M7/162—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only in a bridge configuration
- H02M7/1623—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only in a bridge configuration with control circuit
- H02M7/1626—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only in a bridge configuration with control circuit with automatic control of the output voltage or current
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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
- H02M5/00—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC
- H02M5/42—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters
- H02M5/44—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters using discharge tubes or semiconductor devices to convert the intermediate DC into AC
- H02M5/443—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters using discharge tubes or semiconductor devices to convert the intermediate DC into AC using devices of a thyratron or thyristor type requiring extinguishing means
- H02M5/45—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters using discharge tubes or semiconductor devices to convert the intermediate DC into AC using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
- H02M5/4505—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters using discharge tubes or semiconductor devices to convert the intermediate DC into AC using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only having a rectifier with controlled elements
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- Power Engineering (AREA)
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Abstract
The present application relates to a load power control method, a control device, a storage medium, and a power management system. The method comprises the following steps: acquiring a voltage signal and a current signal after inversion in a power supply circuit corresponding to a load; acquiring a voltage effective value and a current effective value according to the voltage signal and the current signal; calculating the current effective power based on the voltage effective value and the current effective value; and adjusting the output voltage of the power supply circuit according to the current effective power and the preset target power so as to adjust the power of the load. By adopting the method and the device, more accurate power control precision can be achieved.
Description
Technical Field
The present disclosure relates to the field of electrical control technologies, and in particular, to a load power control method, a control device, a storage medium, and a power management system.
Background
During the operation of the device, the actual power of the device may not reach the set power, so the power needs to be adjusted.
Most of the power closed-loop control methods adopted at present collect rectified direct-current voltage as power feedback of a load, and then perform power regulation and control according to the deviation of the feedback power and set power. However, the rectified dc voltage usually does not accurately reflect the power condition of the load, and therefore, the power regulation is not accurately controlled.
Disclosure of Invention
In view of the above, it is desirable to provide a load power control method, a control device, a storage medium, and a power management system that can improve power regulation accuracy.
A method of load power control, comprising:
acquiring a voltage signal and a current signal after inversion in a power supply circuit corresponding to a load;
acquiring a voltage effective value and a current effective value according to the voltage signal and the current signal;
calculating the current effective power based on the voltage effective value and the current effective value;
and adjusting the output voltage of the power supply circuit according to the current effective power and a preset target power so as to adjust the power of the load.
A control apparatus comprising a memory and a processor, the memory storing a computer program, the processor implementing the following steps when executing the computer program:
acquiring a voltage signal and a current signal after inversion in a power supply circuit corresponding to a load;
acquiring a voltage effective value and a current effective value according to the voltage signal and the current signal;
calculating the current effective power based on the voltage effective value and the current effective value;
and adjusting the output voltage of the power supply circuit according to the current effective power and a preset target power so as to adjust the power of the load.
A readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of:
acquiring a voltage signal and a current signal after inversion in a power supply circuit corresponding to a load;
acquiring a voltage effective value and a current effective value according to the voltage signal and the current signal;
calculating the current effective power based on the voltage effective value and the current effective value;
and adjusting the output voltage of the power supply circuit according to the current effective power and a preset target power so as to adjust the power of the load.
A power management system comprises an alternating current power supply circuit, a sampling circuit and the control device, wherein the control device is connected with the alternating current power supply circuit and the sampling circuit;
the sampling circuit is connected with the alternating current power supply circuit and used for sampling the voltage signal and the current signal which are inverted by the alternating current power supply circuit and sending the voltage signal and the current signal to the control device.
According to the load power control method, the control device, the storage medium and the power management system, the inverted voltage signal and current signal in the power circuit corresponding to the load are collected, the current effective power is calculated as the feedback quantity of control on the basis of the inverted voltage signal and current signal, the output voltage of the power circuit is adjusted on the basis of the feedback quantity and the preset target power so as to adjust the power of the load, and the control of the load power is realized. The inverted signal can more accurately reflect the actual power condition of the load, so that the accuracy of power regulation and control based on the actual power is higher, and more accurate power control accuracy and better dynamic characteristics can be achieved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow diagram illustrating a method for load power control according to one embodiment;
FIG. 2 is a block diagram of a power management system in one embodiment;
FIG. 3 is a schematic circuit diagram of a three-phase bridge fully-controlled rectifier circuit according to an embodiment;
fig. 4 is a waveform diagram of a three-phase bridge type fully-controlled rectifying circuit alpha equal to 0 deg.;
fig. 5 is a waveform diagram of a three-phase bridge type fully-controlled rectifying circuit alpha being 60 degrees;
fig. 6 is a waveform diagram of a three-phase bridge type fully-controlled rectifying circuit alpha being 90 degrees;
fig. 7 is a schematic structural diagram of a power management system in another embodiment.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Embodiments of the present application are set forth in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or be connected to the other element through intervening elements. Further, "connection" in the following embodiments is understood to mean "electrical connection", "communication connection", or the like, if there is a transfer of electrical signals or data between the connected objects.
As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.
As described in the background art, the problem of low precision in power regulation in the prior art is found by the inventor, and the reason for the problem is that for a load using an ac output, a rectified dc voltage needs to be further processed, and is not directly output as a dc voltage, for example, for a heater, after rectification, an inverter needs to be inverted for output; therefore, the power condition of the load cannot be accurately reflected by collecting and rectifying the direct-current voltage, and the accuracy of feeding back the direct-current voltage for power regulation is low.
Based on the reasons, the scheme capable of improving the power regulation and control precision is provided.
In one embodiment, as shown in fig. 1, a load power control method is provided, for example, applied to a control device, and the method includes the following steps:
s110: and acquiring the inverted voltage signal and current signal in the power circuit corresponding to the load.
The power circuit corresponding to the load may be a circuit that supplies power to the load. The power circuit processes the accessed voltage and outputs the processed voltage; the power of the load varies with the output voltage of the power supply circuit. Specifically, the power supply circuit is a power supply circuit outputting alternating current and comprises an inverter circuit; the inverted signal in the power circuit is an alternating current signal output by the inverter circuit, that is, the acquired voltage signal is an alternating current voltage signal, and the acquired current signal is an alternating current signal.
The control device may collect the voltage signal and the current signal at preset intervals, for example, at intervals. Specifically, the control device may acquire the voltage signal and the current signal, which are sampled after inversion from the power supply circuit, from the sampling circuit.
S130: and acquiring a voltage effective value and a current effective value according to the voltage signal and the current signal.
Specifically, a voltage effective value is obtained according to the currently acquired voltage signal, and a current effective value is obtained according to the currently acquired current signal.
S150: and calculating the current effective power based on the voltage effective value and the current effective value.
The effective power is the power corresponding to the voltage effective value and the current effective value. Specifically, the control device may perform calculation by using a power calculation function according to the currently collected voltage effective value and current effective value to obtain the current effective power. Of course, it is understood that the control device may also obtain the effective power in other manners, for example, the effective power may be obtained by outputting the voltage effective value and the current effective value to an external device, and receiving the effective power returned after calculation by the external device.
S170: and adjusting the output voltage of the power supply circuit according to the current effective power and the preset target power so as to adjust the power of the load.
The current real power reflects the actual power level of the load. The preset target power is the power which the set load needs to reach. Specifically, the control device adjusts the output voltage of the power supply circuit with the aim that the current effective power reaches the target power according to the deviation between the current effective power and the preset target power.
The output voltage of the power supply circuit is the voltage finally output by the power supply circuit; the power of the load changes along with the output voltage change of the power supply circuit, so the power of the load is adjusted by adjusting the output voltage of the power supply circuit, and the control of the power of the load is realized. The voltage output by any sub-circuit in the power circuit changes to cause the change of the overall output voltage, and specifically, the control device may adjust the voltage output by any sub-circuit in the power circuit, for example, the power circuit includes a rectifying circuit and an inverter circuit, and the control device may adjust the voltage output by the rectifying circuit or may adjust the voltage output by the inverter circuit.
According to the load power control method, the inverted voltage signal and current signal in the power circuit of the load are collected, the current effective power is obtained as the feedback quantity of control by processing based on the inverted voltage signal and current signal, the output voltage of the power circuit is adjusted based on the feedback quantity and the preset target power so as to adjust the power of the load, and the control of the power of the load is realized. The inverted signal can more accurately reflect the actual power condition of the load, so that the accuracy of power regulation and control based on the actual power is higher, and more accurate power control accuracy and better dynamic characteristics can be achieved.
In one embodiment, step S130 includes step (a1) and step (a 2).
Step (a 1): the voltage peak value and the voltage valley value are determined based on the voltage signal, and the voltage effective value is calculated according to the voltage peak value and the voltage valley value.
The peak value of the voltage wave is the highest value in one voltage period of the voltage signal, and the valley value of the voltage wave is the lowest value in one voltage period of the voltage signal. Specifically, the control device may calculate a peak-to-peak value of the voltage signal from the voltage peak value and the voltage valley value, and calculate the voltage effective value from the peak-to-peak value.
Step (a 2): the current peak value and the current valley value are determined based on the current signal, and the current effective value is calculated according to the current peak value and the current valley value.
The peak value of the current wave is the highest value in one voltage period of the current signal, and the valley value of the current wave is the lowest value in one voltage period of the current signal. Specifically, the control device may calculate a peak-to-peak value of the current signal from the current wave peak value and the current wave valley value, and calculate the current effective value from the peak-to-peak value.
The wave crest and the wave trough can accurately reflect the amplitude of the voltage signal/current signal. By determining the respective peak and trough according to the voltage signal and the current signal, the accuracy of the effective value calculated according to the peak and trough is high. It is understood that in other embodiments, the voltage and current effective values may be obtained in other manners, for example, the voltage wave peak value of the voltage signal and the current wave peak value of the current signal may be determined, the voltage effective value may be calculated according to the voltage wave peak value, and the current effective value may be calculated according to the current wave peak value.
In one embodiment, the determining the voltage peak value and the voltage valley value based on the voltage signal in step (a1) includes: tracking the phase of the voltage signal, starting timing when the phase of the voltage signal is 0 degrees, and acquiring the voltage value of the voltage signal in a preset voltage period with timing duration of 1/4 to obtain the voltage wave peak value of the voltage signal; and restarting timing in the preset voltage period of 1/4, and acquiring the voltage value of the voltage signal in the preset voltage period with the timing duration of 1/2 to obtain the voltage wave valley value of the voltage signal.
The preset voltage period is the period of the voltage signal after the inversion of the power circuit. Taking the example where the voltage signal is a sinusoidal signal, the voltage value at 1/4 cycles is at the peak and the voltage value at 3/4 cycles (1/2 cycles away from 1/4 cycles) is at the trough during one cycle starting with a 0 ° phase.
Specifically, by tracking the phase of the voltage signal, when the voltage phase is 0 °, as a starting point, a preset voltage period with a timer time of 1/4 is set for accurate timing, and when the timing time is up, the current voltage value is sampled to obtain a voltage peak value. Starting with a preset voltage period counted to 1/4, namely, starting with the time of sampling the peak value of the voltage wave, setting a preset voltage period with a timer time of 1/2, restarting accurate timing, and counting the time to reach 3/4 periods starting with a phase of 0 °, wherein the current voltage value is sampled to obtain the valley value of the voltage wave. Therefore, the voltage wave peak value and the voltage wave valley value in a single period can be accurately collected. And repeating the same steps to obtain the peak value and the valley value of the voltage wave in the next acquisition period when the acquisition is carried out next time.
The determination of the current peak value and the current valley value based on the current signal in the step (a2) may be performed in the same manner as the determination of the voltage peak value and the voltage valley value in the step (a1) to accurately collect the current peak value and the current valley value.
In one embodiment, step S150 includes:
Pw＝UiIicosβ； (1)
wherein Pw is the current effective power, Ui is the voltage effective value, Ii is the current effective value, and beta is the output power factor angle.
The effective power corresponding to the voltage effective value and the current effective value can be accurately calculated by adopting the formula (1). When the load is a heater, the voltage current output by the inverter of the heater in a normal operating state is in a resonance state, and the power factor angle at a certain time is approximately considered to be 0, so that Pw is equal to UiIi for the heater.
In one embodiment, the adjusting the output voltage of the power circuit in step S170 includes: the conduction time of a rectifier tube in a rectifying circuit before inversion in a power supply circuit is adjusted.
The power circuit comprises a rectifying circuit and an inverter circuit, and the voltage output after rectification by the rectifying circuit is output after inversion by the inverter circuit. The rectifier tube is a device used for rectification in the rectifier circuit, for example, the rectifier circuit may be a three-phase bridge full-control rectifier circuit, and the adopted rectifier tube is a thyristor. Specifically, the control device adjusts the on-time of the rectifier tube, and can change the voltage output by the rectifier circuit, so as to change the output voltage of the power circuit and further adjust the power of the load. The power of the load is regulated and controlled by adjusting the output mode of the rectifying circuit, and the control is convenient.
In one embodiment, step S170 includes: if the current effective power is larger than the preset target power, reducing the output voltage of the power circuit; and if the current effective power is smaller than the preset target power, increasing the output voltage of the power circuit.
If the current effective power is larger than the preset target power, the current load power is over-high, and at the moment, the load power can be controlled to be reduced by reducing the output voltage of the power supply circuit. If the current effective power is smaller than the preset target power, the current effective power indicates that the power of the load is too small, and at the moment, the power of the load can be controlled to be increased by increasing the output voltage of the power circuit. The actual power of the load can be close to the target power by analyzing the current effective power based on the target power so as to adjust the power. Specifically, power adjustment is performed once every time a voltage signal and a current signal are collected, and power is dynamically adjusted.
The output voltage of the power circuit is reduced, specifically, the conduction time of a rectifier tube in a rectifying circuit before inversion in the power circuit is reduced; the output voltage of the power supply circuit may be increased, specifically, the on time of a rectifier in a rectifier circuit before inversion in the power supply circuit may be increased.
Specifically, the control device may perform closed-loop control by using a PID control algorithm, and perform control output by using the current effective power Pw as a feedback value and using a preset target power as a target value, so as to control the conduction of the thyristor and change the voltage of the rectified output, thereby adjusting the power of the inverter side.
It should be understood that, although the steps in the flowchart of fig. 1 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least a portion of the steps in fig. 1 may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, which are not necessarily performed in sequence, but may be performed in turn or alternately with other steps or at least a portion of the other steps or stages.
In an embodiment, a readable storage medium is provided, on which a computer program is stored, which computer program, when being executed by a processor, is adapted to carry out the steps of the above-mentioned method embodiments.
The readable storage medium can realize the steps in the embodiments of the method, and can control the power more accurately.
In one embodiment, a control device is provided, comprising a memory and a processor, the memory having stored therein a computer program, the processor implementing the steps of the above method embodiments when executing the computer program.
The control device can realize the steps in the embodiments of the method, and can control the power more accurately in the same way.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database or other medium used in the embodiments provided herein can include at least one of non-volatile and volatile memory. Non-volatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical storage, or the like. Volatile Memory can include Random Access Memory (RAM) or external cache Memory. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others.
As shown in fig. 2, in one embodiment, a power management system is provided, which includes an ac power circuit 210, a sampling circuit 220, and a control device 230, wherein the control device 230 connects the ac power circuit 210 and the sampling circuit 220. The alternating current power supply circuit is a power supply circuit for outputting alternating current.
The sampling circuit 220 is connected to the ac power circuit 210, and is configured to sample the voltage signal and the current signal after inversion of the ac power circuit and send the voltage signal and the current signal to the control device 230. The control means 230 comprises a memory in which a computer program is stored and a processor which, when executing the computer program, carries out the steps in the embodiments of the method described above.
The power management system adopts the control device which can realize the steps of the method, and can control the power more accurately and has good power regulation and control effect.
In one embodiment, the ac power circuit 210 includes a rectifying circuit and an inverting circuit connected in sequence, the control device 230 is connected to the rectifying circuit, and the sampling circuit 230 is connected to an output terminal of the inverting circuit and is configured to sample a current signal and a voltage signal output by the inverting circuit.
The rectification circuit is connected with the input voltage, rectifies the input voltage and outputs the rectified voltage to the inverter circuit; the inverter circuit performs inversion processing on the input voltage and outputs the voltage. Specifically, the rectifying circuit includes a rectifying tube for rectifying. The control device 230 is connected to the rectifying circuit, and adjusts the on-time of the rectifying tube in the rectifying circuit according to the current effective power and the preset target power to adjust the voltage output by the rectifying circuit, so as to change the output voltage of the power circuit and further adjust the power of the load. The power of the load is regulated and controlled by adjusting the output mode of the rectifying circuit, and the control is convenient.
In particular, the rectifier circuit may be a three-phase bridge fully controlled rectifier circuit. The three-phase bridge type full-control rectification circuit is the most widely applied rectification circuit in industry, and the essence of the three-phase bridge type full-control rectification circuit is the series connection of a group of common cathodes and a group of common anodes three-phase half-wave controllable rectification circuits, as shown in fig. 3; the phase shift range is 0-120 degrees, and the maximum conduction angle is 120 degrees. Wherein Ud is output voltage, and Ud is processed by a post-stage filter circuit to obtain stable direct current voltage. As shown in fig. 4 to 6, 3 graphs show output waveforms of α ═ 0 °, α ═ 60 °, and α ═ 90 °. In one period of the alternating current power supply, the electrical angle of the thyristor which is not conducted under the action of the positive anode voltage is called a control angle or a phase shift angle and is expressed by alpha; the electrical angle of conduction is called the conduction angle and is denoted by θ. That is, when α is 0, the conduction angle θ is 120 degrees, and the rectifier circuit is in a fully conducting state.
In one embodiment, the ac power circuit may further include a transformer, and the transformer is connected to the inverter circuit and is configured to transform the voltage output by the inverter circuit and output the transformed voltage. Through adopting the transformer, carry out the vary voltage to the voltage after the contravariant, make the voltage reach the size of follow-up needs, it is practical convenient.
In one embodiment, the sampling circuit 220 includes a voltage sampling circuit and a current sampling circuit; the voltage sampling circuit is connected with the alternating current power supply circuit 210 and the control device 230, and is used for sampling a voltage signal inverted by the alternating current power supply circuit 210 and sending the voltage signal to the control device 230; the current sampling circuit is connected to the ac power circuit 210 and the control device 230, and is configured to sample a current signal inverted by the ac power circuit 210 and send the current signal to the control device 230.
Specifically, the current sampling circuit may be directly connected to the ac power circuit 210, or may be associated with the ac power circuit 210 by coupling induction, and sample the current signal by induction. The voltage sampling circuit and the current sampling circuit are adopted to respectively sample the voltage signal and the current signal, so that the subsequent signals based on sampling can be conveniently and respectively processed.
In one embodiment, as shown in FIG. 7, the control device 230 is an MCU (micro controller Unit). The MCU is adopted for power regulation and control, so that the occupied size is small and the power consumption is low.
In the description herein, references to the description of "some embodiments," "other embodiments," "desired embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, a schematic description of the above terminology may not necessarily refer to the same embodiment or example.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A method for controlling power of a load, comprising:
acquiring a voltage signal and a current signal after inversion in a power supply circuit corresponding to a load;
acquiring a voltage effective value and a current effective value according to the voltage signal and the current signal;
calculating the current effective power based on the voltage effective value and the current effective value;
and adjusting the output voltage of the power supply circuit according to the current effective power and a preset target power so as to adjust the power of the load.
2. The method of claim 1, wherein obtaining a voltage effective value and a current effective value from the voltage signal and the current signal comprises:
determining a voltage wave peak value and a voltage wave valley value based on the voltage signal, and calculating a voltage effective value according to the voltage wave peak value and the voltage wave valley value;
and determining a current wave peak value and a current wave valley value based on the current signal, and calculating a current effective value according to the current wave peak value and the current wave valley value.
3. The method of claim 2, wherein said determining a voltage peak and a voltage valley based on said voltage signal comprises:
tracking the phase of the voltage signal, starting timing when the phase of the voltage signal is 0 degrees, and acquiring the voltage value of the voltage signal when the timing duration is 1/4 within a preset voltage period to obtain the voltage wave peak value of the voltage signal;
restarting timing in a preset voltage period of 1/4, and acquiring the voltage value of the voltage signal in the preset voltage period with the timing duration of 1/2 to obtain the voltage wave valley value of the voltage signal.
4. The method of claim 1, wherein the adjusting the output voltage of the power circuit comprises:
and adjusting the conduction time of a rectifier tube in a rectifying circuit before inversion in the power supply circuit.
5. The method of claim 1, wherein the adjusting the output voltage of the power circuit according to the current effective power and a preset target power comprises:
if the current effective power is larger than the preset target power, reducing the output voltage of the power supply circuit;
and if the current effective power is smaller than the preset target power, increasing the output voltage of the power supply circuit.
6. A readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 5.
7. A control apparatus comprising a memory and a processor, the memory storing a computer program, characterized in that the processor, when executing the computer program, implements the steps of the method of any one of claims 1 to 5.
8. A power management system comprising an ac power circuit, a sampling circuit, and the control device of claim 7, the control device connecting the ac power circuit and the sampling circuit;
the sampling circuit is connected with the alternating current power supply circuit and used for sampling the voltage signal and the current signal which are inverted by the alternating current power supply circuit and sending the voltage signal and the current signal to the control device.
9. The power management system according to claim 8, wherein the ac power circuit comprises a rectifying circuit and an inverting circuit connected in sequence, the control device is connected to the rectifying circuit, and the sampling circuit is connected to an output end of the inverting circuit and is configured to sample a current signal and a voltage signal output by the inverting circuit.
10. The power management system of claim 8, wherein the sampling circuit comprises a voltage sampling circuit and a current sampling circuit;
the voltage sampling circuit is connected with the alternating current power supply circuit and the control device and is used for sampling a voltage signal inverted by the alternating current power supply circuit and sending the voltage signal to the control device;
the current sampling circuit is connected with the alternating current power supply circuit and the control device and is used for sampling current signals inverted by the alternating current power supply circuit and sending the current signals to the control device.
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