CN116722737B - Control method, system and storage medium for LLC power supply self-adaptive adjustment output - Google Patents
Control method, system and storage medium for LLC power supply self-adaptive adjustment output Download PDFInfo
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- CN116722737B CN116722737B CN202310997002.1A CN202310997002A CN116722737B CN 116722737 B CN116722737 B CN 116722737B CN 202310997002 A CN202310997002 A CN 202310997002A CN 116722737 B CN116722737 B CN 116722737B
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- 239000003990 capacitor Substances 0.000 claims description 106
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Classifications
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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
- H02M3/01—Resonant DC/DC converters
- H02M3/015—Resonant DC/DC converters with means for adaptation of resonance frequency, e.g. by modification of capacitance or inductance of resonance circuit
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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
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/4815—Resonant converters
- H02M7/4818—Resonant converters with means for adaptation of resonance frequency, e.g. by modification of capacitance or inductance of resonance circuits
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention provides a control method, a system and a storage medium for LLC power supply self-adaptive regulation output, when detecting that first voltage information is lower than or higher than a preset first voltage range, firstly, obtaining first frequency information according to first capacitance information, and obtaining second frequency information; then, according to the relation between the first voltage information and the voltage range and the magnitude relation between the first frequency information and the second frequency information, determining an adjustment mode of the first frequency information; finally, according to the relation between the temperature information and the preset temperature threshold value, the power supply output is adjusted; the effect of adaptively adjusting output and keeping output voltage stable according to the real-time state of the LLC power supply circuit is achieved; meanwhile, the components of the LLC power supply circuit are ensured to work in a safe temperature state, and the service life is prolonged.
Description
Technical Field
The present invention relates to the field of LLC resonant switching power supplies, and more particularly, to a control method, system, and storage medium for adaptively adjusting output of an LLC power supply.
Background
A switching power supply (Switch Mode Power Supply, SMPS for short), also called a switching power supply or a switching converter, is a high-frequency power conversion device, and is a power supply. With the rapid development of the technology of the switching power supply, the switching power supply is developed towards high power, high efficiency and high power density.
With further improvement of technology, higher requirements are placed on the performance of switching power supplies. LLC resonant switching power supply is composed of two inductive reactance devices and a capacitive reactance device, can meet the requirement of high frequency, can reach higher conversion efficiency, and has been widely adopted in industry. According to the working principle of LLC power supply, the closer the resonance frequency is to the frequency of input power supply, the larger the gain of output voltage is; the gain of the output voltage is gradually reduced at a resonant frequency higher or lower than the frequency of the input power supply.
However, due to the influence of factors such as instability of an input power supply and long-time operation heating, the output voltage is shifted, and even the service life of power circuit components is influenced.
Disclosure of Invention
In view of the foregoing, it is an object of the present invention to provide a control method, system and storage medium for adaptively adjusting output of an LLC power supply, which can adaptively adjust circuit parameters of the LLC power supply according to an input power supply frequency and an output voltage offset, so that the LLC power supply maintains stable output. In addition, the circuit of LLC power supply is ensured to work in a safe state through real-time temperature detection, so that the purpose of protecting the service life of the circuit is achieved.
The first aspect of the present invention provides a control method for adaptively adjusting output of an LLC power source, the method comprising:
acquiring first voltage information, and judging whether the first voltage information is in a preset first voltage range;
when the first voltage information is lower or higher than a preset first voltage range,
acquiring first capacitance information, and acquiring first frequency information according to the first capacitance information;
acquiring second frequency information;
determining an adjustment mode of the first frequency information according to the relation between the first voltage information and the voltage range and the magnitude relation between the first frequency information and the second frequency information;
acquiring temperature information, and judging whether the temperature information exceeds a preset temperature threshold value;
if not, carrying out output adjustment according to the adjustment mode; if the voltage exceeds the preset safety voltage information, the first voltage range is adjusted, and the output is adjusted.
In this scheme, the adjustment mode of the first frequency is determined according to the magnitude relation between the first frequency information and the second frequency information and the relation between the first voltage information and the voltage range, specifically:
when the first voltage information is lower than the preset voltage range;
if the first frequency information is lower than the second frequency information, setting an adjustment mode of the first frequency information to be upward adjustment;
And if the first frequency information is not lower than the second frequency information, setting the adjustment mode of the first frequency information to be downward adjustment.
In this scheme, the adjustment mode of the first frequency is determined according to the magnitude relation between the first frequency information and the second frequency information and the relation between the first voltage information and the voltage range, specifically:
when the first voltage information is higher than a preset voltage range;
if the first frequency information is lower than the second frequency information, setting an adjustment mode of the first frequency information to be downward adjustment;
and if the first frequency information is not lower than the second frequency information, setting the adjustment mode of the first frequency information to be upward adjustment.
In this scheme, carry out output adjustment according to adjustment mode, specifically be:
when the adjustment mode of the first frequency information is downward adjustment, the first capacitance information is upward adjusted according to a preset first step according to a resonant frequency formula;
and when the adjustment mode of the first frequency information is upward adjustment, the first capacitance information is downward adjusted according to a preset first step according to a resonant frequency formula.
In this scheme, still include:
when the temperature information exceeds the preset temperature threshold value;
The preset safety voltage information adjusts a first voltage range, and the first capacitance information is adjusted downwards according to a preset second step;
and setting the mark information and entering a low power consumption mode.
In this scheme, still include:
the first capacitance information is a capacitance value of a digital tunable capacitor;
the digital adjustable capacitor is in communication connection with the digital adjustable capacitor through a preset communication instruction, and the digital adjustable capacitor comprises the steps of acquiring capacitance information of the digital adjustable capacitor through a capacitance value acquisition instruction and adjusting the capacitance information of the adjustable capacitor through a capacitance value adjustment instruction.
The second aspect of the present invention provides a control system for adaptive adjustment output of LLC power, including a control method program for adaptive adjustment output of LLC power, which when executed by the processor, implements the steps of:
acquiring first voltage information, and judging whether the first voltage information is in a preset first voltage range;
when the first voltage information is lower or higher than a preset first voltage range,
acquiring first capacitance information, and acquiring first frequency information according to the first capacitance information;
acquiring second frequency information;
determining an adjustment mode of the first frequency information according to the relation between the first voltage information and the voltage range and the magnitude relation between the first frequency information and the second frequency information;
Acquiring temperature information, and judging whether the temperature information exceeds a preset temperature threshold value;
if not, carrying out output adjustment according to the adjustment mode; if the voltage exceeds the preset safety voltage information, the first voltage range is adjusted, and the output is adjusted.
In this scheme, the adjustment mode of the first frequency is determined according to the magnitude relation between the first frequency information and the second frequency information and the relation between the first voltage information and the voltage range, specifically:
when the first voltage information is lower than the preset voltage range;
if the first frequency information is lower than the second frequency information, setting an adjustment mode of the first frequency information to be upward adjustment;
and if the first frequency information is not lower than the second frequency information, setting the adjustment mode of the first frequency information to be downward adjustment.
In this scheme, the adjustment mode of the first frequency is determined according to the magnitude relation between the first frequency information and the second frequency information and the relation between the first voltage information and the voltage range, specifically:
when the first voltage information is higher than a preset voltage range;
if the first frequency information is lower than the second frequency information, setting an adjustment mode of the first frequency information to be downward adjustment;
And if the first frequency information is not lower than the second frequency information, setting the adjustment mode of the first frequency information to be upward adjustment.
A third aspect of the present invention provides a computer-readable storage medium having embodied therein a control method program for LLC power adaptively adjusted output, which when executed by a processor, implements the steps of a control method for LLC power adaptively adjusted output as described in any one of the preceding claims.
The invention provides a control method, a system and a storage medium for LLC power supply self-adaptive regulation output, when detecting that first voltage information is lower than or higher than a preset first voltage range, firstly, obtaining first frequency information according to first capacitance information, and obtaining second frequency information; then, according to the relation between the first voltage information and the voltage range and the magnitude relation between the first frequency information and the second frequency information, determining an adjustment mode of the first frequency information; finally, according to the relation between the temperature information and the preset temperature threshold value, the power supply output is adjusted; the effect of adaptively adjusting output and keeping output voltage stable according to the real-time state of the LLC power supply circuit is achieved; meanwhile, the components of the LLC power supply circuit are ensured to work in a safe temperature state, and the service life is prolonged.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be considered as limiting the scope.
FIG. 1 is a flow chart of a control method for adaptively adjusting output of an LLC power supply according to the present invention;
FIG. 2 is a flowchart showing a method for determining an adjustment mode of a first frequency when the first voltage information is lower than a preset voltage range;
FIG. 3 is a flowchart showing a method for determining an adjustment mode of a first frequency when the first voltage information is higher than a preset voltage range;
fig. 4 shows a block diagram of a control system for adaptively adjusting the output of an LLC power source in accordance with the invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Unless otherwise defined, all terms (including technical and scientific terms) used in the embodiments of the invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The terms "first," "second," and the like, as used in embodiments of the present invention, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Nor does the terms "a," "an," or "the" or similar terms mean a limitation of quantity, but rather that at least one is present. Likewise, the word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The steps preceding or following the methods of embodiments of the present invention are not necessarily performed in a sequential order. Rather, the various steps may be processed in reverse order or simultaneously. Also, other operations may be added to or removed from these processes.
In addition, functional modules in the embodiments of the present invention may be integrated together to form a single part, or each module may exist alone, or two or more modules may be integrated to form a single part.
Fig. 1 shows a flow chart of a control method of an LLC power supply adaptive adjustment output according to the invention.
As shown in fig. 1, the invention discloses a control method for adaptively adjusting output of an LLC power supply, which comprises the following steps:
s102, acquiring first voltage information, and judging whether the first voltage information is in a preset first voltage range;
s104, when the first voltage information is lower than or higher than a preset first voltage range,
s106, acquiring first capacitance information, and acquiring first frequency information according to the first capacitance information;
s108, acquiring second frequency information;
s110, determining an adjustment mode of the first frequency information according to the relation between the first voltage information and the voltage range and the magnitude relation between the first frequency information and the second frequency information;
s112, acquiring temperature information, and judging whether the temperature information exceeds a preset temperature threshold value;
if not, executing S114, and carrying out output adjustment according to the adjustment mode; if yes, S116 is executed, the first voltage range is adjusted according to the preset safety voltage information, and the output is adjusted.
The first voltage information is an output voltage of the LLC power supply circuit; the first voltage range is a set range of output voltages meeting the requirements; the first capacitance information is a capacitance value of a capacitor in the LLC power supply circuit for adjusting the resonance frequency; the first frequency information is a resonant frequency of a capacitor and an inductor in the LLC power circuit; the second frequency information is the frequency of the input power; the temperature information is a real-time temperature value of the LLC power circuit.
First, the preset first voltage range may be a set range, for example, 210 volts to 230 volts; it may also be based on the error range of the standard output voltage, for example 220 volts up and down by 5%, i.e. 209 volts to 231 volts. When the first voltage is lower than or higher than a preset first voltage range, the first voltage is used for indicating that the adjusting system needs to be activated to adjust the output voltage.
Then, when the output voltage needs to be regulated, the resonant frequency is regulated according to the working principle of the LLC power supply to regulate the output gain of the circuit, so that the purpose of regulating the output voltage is achieved. According to the basic principle that the higher the output gain of the circuit is when the resonance frequency is closer to the input power supply frequency, when the first voltage information is lower than the voltage range, the resonance frequency needs to be set in a direction close to the input power supply frequency; when the first voltage information is higher than the voltage range, the resonance frequency needs to be set in a direction away from the input power supply frequency.
Finally, when the temperature of the circuit increases, the characteristics of components in the circuit change. When the circuit temperature does not exceed the preset temperature threshold, the components are indicated to work in a normal state, and at the moment, the output voltage is adjusted according to the adjustment mode of the resonant frequency. When the circuit temperature exceeds a preset threshold value, the circuit state at the moment is not suitable for continuously executing high-power output, the first voltage range is set to be a preset safe voltage range at the moment, and the output voltage is adjusted until the output voltage reaches the safe voltage range, so that the power supply circuit works in a low-power state, and the aim of reducing the temperature is fulfilled. And (3) until the temperature is reduced to a preset temperature threshold value, the first voltage range is regulated back, and the power supply circuit works in a normal power state.
Fig. 2 shows a flowchart of determining an adjustment mode of the first frequency when the first voltage information is below a preset voltage range.
According to an embodiment of the present invention, as shown in fig. 2, the determining the adjustment mode of the first frequency according to the magnitude relation between the first frequency information and the second frequency information and the relation between the first voltage information and the voltage range specifically includes:
s202, when the first voltage information is lower than the preset voltage range;
S204, if the first frequency information is lower than the second frequency information, executing S206, and setting the adjustment mode of the first frequency information to be upward adjustment;
s208, if the first frequency information is not lower than the second frequency information, S210 is executed to set the adjustment mode of the first frequency information to be downward adjustment.
It should be noted that, according to the working principle of the LLC power supply, the resonant frequency is adjusted to adjust the output gain of the circuit, so as to achieve the purpose of adjusting the output voltage. When the first voltage information is lower than the preset voltage range, the output gain is required to be increased to increase the output voltage. In accordance with the basic principle that the higher the output gain of the circuit is when the resonance frequency is closer to the input power supply frequency, in order to increase the output voltage, it is necessary to set the resonance frequency closer to the input power supply frequency. That is, when the first frequency information is lower than the second frequency information, the first frequency information needs to be adjusted upwards to increase the output gain, so as to achieve the purpose of increasing the output voltage; when the first frequency information is not lower than the second frequency information, the first frequency information is required to be adjusted downwards to improve the output gain, so that the purpose of improving the output voltage is achieved.
FIG. 3 is a flowchart showing a method for determining an adjustment mode of a first frequency when the first voltage information is higher than a preset voltage range;
according to an embodiment of the present invention, as shown in fig. 3, the determining the adjustment mode of the first frequency according to the magnitude relation between the first frequency information and the second frequency information and the relation between the first voltage information and the voltage range specifically includes:
s302, when the first voltage information is higher than a preset voltage range;
s304, if the first frequency information is lower than the second frequency information, S306 is executed to set the adjustment mode of the first frequency information as downward adjustment;
if the first frequency information is not lower than the second frequency information, S308 is executed, and the adjustment mode of the first frequency information is set to be upward adjustment S310.
The resonant frequency is adjusted according to the working principle of the LLC power supply, so that the purpose of adjusting the output voltage is achieved by adjusting the output gain of the circuit. When the first voltage information is higher than the preset voltage range, the output gain needs to be reduced to reduce the output voltage. The basic principle that the lower the output gain of a circuit is when the power supply frequency is input according to the principle that the resonance frequency is, the further the resonance frequency is required to be set from the input power supply frequency in order to lower the output voltage. That is, when the first frequency information is lower than the second frequency information, the first frequency needs to be adjusted downward to reduce the output gain, so as to achieve the purpose of reducing the output voltage; when the first frequency information is not lower than the second frequency information, the first frequency information is required to be adjusted upwards to reduce the output gain, so that the purpose of reducing the output voltage is achieved.
According to the embodiment of the invention, the output adjustment is performed according to the adjustment mode, specifically:
when the adjustment mode of the first frequency information is downward adjustment, the first capacitance information is upward adjusted according to a preset first step according to a resonant frequency formula;
and when the adjustment mode of the first frequency information is upward adjustment, the first capacitance information is downward adjusted according to a preset first step according to a resonant frequency formula.
The resonant frequency calculation formula of the LLC power circuit is:
；
wherein:
a frequency value representing the resonance frequency, i.e. the first frequency information;
representing circumferenceThe rate is constant;
representing the inductance value of an inductor in the LLC power circuit;
representing a capacitance value of a capacitor in the LLC power supply circuit, i.e. a capacitance value of the first capacitance information;
as can be seen from the formula, when the first frequency information is to be adjusted downward, the capacitance value of the first capacitance information needs to be adjusted upward; when the first frequency information is to be adjusted upwards, the capacitance value of the first capacitance information needs to be adjusted downwards. The adjustment step is a level of capacitance variation when the digital tunable capacitor executes an adjustment instruction. Assuming that the digital tunable capacitor is divided into 100 capacitance levels, the preset first step is 5 levels, and if the current level is 50, the preset first step is adjusted upwards to be 55 th level, and the preset first step is adjusted downwards to be 45 th level.
According to an embodiment of the present invention, further comprising:
when the temperature information exceeds the preset temperature threshold value;
the preset safety voltage information adjusts a first voltage range, and the first capacitance information is adjusted downwards according to a preset second step;
and setting the mark information and entering a low power consumption mode.
When the temperature of the circuit increases, the characteristics of the components in the circuit change. When the circuit temperature exceeds a preset threshold, the circuit state is not suitable for continuously executing high-power output, and the first voltage range is set to be a preset safe voltage range, for example, 220V is the normal working voltage, and 110V is the preset safe voltage. The digitally tunable capacitor is then adjusted downward using a second step, which is a step of relatively large span level, causing the output voltage to drop rapidly. For example, assuming that the digitally tunable capacitor is divided into 100 capacitance levels, the second step may be 20 levels. And adjusting the output voltage until reaching a safe voltage range, so that the power supply circuit works in a low-power state, and the aim of cooling is fulfilled. In addition, the flag bit information is set to indicate that the power supply circuit is overheated and needs to enter into cooling protection, so that the system enters into a low-power consumption mode.
According to an embodiment of the present invention, further comprising:
the first capacitance information is a capacitance value of a digital tunable capacitor;
the digital adjustable capacitor is in communication connection with the digital adjustable capacitor through a preset communication instruction, and the digital adjustable capacitor comprises the steps of acquiring capacitance information of the digital adjustable capacitor through a capacitance value acquisition instruction and adjusting the capacitance information of the adjustable capacitor through a capacitance value adjustment instruction.
It should be noted that, the digital tunable capacitor, also called a digital programmable capacitor, provides a capacitive bias adjustment function for the capacitive sensitive circuit. And reading the capacitance information of the digital adjustable capacitor through a preset communication instruction, and adjusting the capacitance information of the digital adjustable capacitor through the preset instruction.
It is worth mentioning that the method further comprises:
the first capacitance information is a capacitance value of a capacitor;
the capacitor consists of one or more capacitors, and the connection mode is series connection or parallel connection;
wherein at least one of the capacitors is a digitally tunable capacitor.
It should be noted that the capacitive device may achieve the effect of adjusting the overall capacitance by means of series connection or parallel connection.
In one embodiment, the capacitor of the first capacitance information is formed by connecting one or more capacitors in parallel, so that the range of the adjustment capacitance value is increased, and the effect of increasing the adjustment range of the resonance frequency is achieved. For example, the capacitor is formed by connecting an adjustable capacitor and a capacitor with a fixed capacitance in parallel, wherein the adjustable capacitor has an adjusting range of 0-100 capacitance units, the capacitor with the fixed capacitance has 50 capacitance units, and the capacitance range of the capacitor after the adjustable capacitor and the capacitor are connected in parallel is 50-150 capacitance units.
In one embodiment, the capacitor of the first capacitance information is formed by connecting one or more capacitors in series or in parallel, so that the adjustment output precision is improved, and the effect of improving the resonant frequency adjustment precision is achieved. For example, assuming an adjustment level of 100 for an adjustable capacitor, for an adjustable capacitor with an adjustment range of 0-200 capacitance units, the adjustment step is 2 capacitance units; two adjustable capacitors with the adjusting range of 0-100 capacitance units are used in parallel connection, the adjusting range after combination is 0-200 capacitance units, and the adjusting step is 1 capacitance unit.
It is worth mentioning that the method further comprises:
when output adjustment is carried out according to the adjustment mode;
recording the first step adjusted by the first capacitance information and the current first voltage information;
obtaining slope information of the change with time according to the first voltage information in the record;
and adjusting the first step according to the change slope.
When the output voltage is to be adjusted by adjusting the capacitor, the first voltage information is stored after each time the first voltage information is obtained. And establishing a coordinate system with a vertical axis as a voltage value and a horizontal axis as time according to the relation between the record of the first voltage information and the time axis, and drawing a change curve of the first voltage information. The slope of the curve may represent the rate of change of the voltage. After the capacitor is adjusted according to a preset first step, if the output voltage changes slowly, in order to increase the voltage change speed, the output voltage can be quickly adjusted to a preset voltage range, and the first step is increased and adjusted; if the output voltage changes too fast, the up-and-down reciprocating jitter changes are presented, which indicates that the fluctuation range of the output voltage is too large, and the first step needs to be reduced and adjusted.
It is worth mentioning that the method further comprises:
judging whether the temperature information exceeds a preset overtemperature protection threshold value or not;
if so, the digitally tunable capacitor is set to a minimum value, or in an off state.
It should be noted that, when the temperature of the power circuit exceeds the temperature threshold value and enters the safety voltage, the temperature still continues to rise, or the temperature directly rises due to a fault, if the temperature information of the power circuit exceeds the preset overtemperature protection threshold value, the power protection function is triggered. At this time, the first capacitance information of the digital adjustable capacitor is adjusted to the minimum value, or the digital adjustable capacitor with the disconnection function is set to enter the disconnection state and is used for bringing the output voltage to the minimum value, so that the risk of protecting the power circuit components from being burnt due to overhigh temperature is achieved.
Fig. 4 shows a block diagram of a control system for adaptively adjusting the output of an LLC power source in accordance with the invention.
As shown in fig. 4, the invention discloses a control system 4 for LLC power adaptive adjustment output, which comprises a memory 41 and a processor 42, wherein the memory includes a control method program for LLC power adaptive adjustment output, and when the control method program for LLC power adaptive adjustment output is executed by the processor, the following steps are implemented:
Acquiring first voltage information, and judging whether the first voltage information is in a preset first voltage range;
when the first voltage information is lower or higher than a preset first voltage range,
acquiring first capacitance information, and acquiring first frequency information according to the first capacitance information;
acquiring second frequency information;
determining an adjustment mode of the first frequency information according to the relation between the first voltage information and the voltage range and the magnitude relation between the first frequency information and the second frequency information;
acquiring temperature information, and judging whether the temperature information exceeds a preset temperature threshold value;
if not, carrying out output adjustment according to the adjustment mode; if the voltage exceeds the preset safety voltage information, the first voltage range is adjusted, and the output is adjusted.
The first voltage information is an output voltage of the LLC power supply circuit; the first voltage range is a set range of output voltages meeting the requirements; the first capacitance information is a capacitance value of a capacitor in the LLC power supply circuit for adjusting the resonance frequency; the first frequency information is a resonant frequency of a capacitor and an inductor in the LLC power circuit; the second frequency information is the frequency of the input power; the temperature information is a real-time temperature value of the LLC power circuit.
First, the preset first voltage range may be a set range, for example, 210 volts to 230 volts; it may also be based on the error range of the standard output voltage, for example 220 volts up and down by 5%, i.e. 209 volts to 231 volts. When the first voltage is lower than or higher than a preset first voltage range, the first voltage is used for indicating that the adjusting system needs to be activated to adjust the output voltage.
Then, when the output voltage needs to be regulated, the resonant frequency is regulated according to the working principle of the LLC power supply to regulate the output gain of the circuit, so that the purpose of regulating the output voltage is achieved. According to the basic principle that the higher the output gain of the circuit is when the resonance frequency is closer to the input power supply frequency, when the first voltage information is lower than the voltage range, the resonance frequency needs to be set in a direction close to the input power supply frequency; when the first voltage information is higher than the voltage range, the resonance frequency needs to be set in a direction away from the input power supply frequency.
Finally, when the temperature of the circuit increases, the characteristics of components in the circuit change. When the circuit temperature does not exceed the preset temperature threshold, the components are indicated to work in a normal state, and at the moment, the output voltage is adjusted according to the adjustment mode of the resonant frequency. When the circuit temperature exceeds a preset threshold value, the circuit state at the moment is not suitable for continuously executing high-power output, the first voltage range is set to be a preset safe voltage range at the moment, and the output voltage is adjusted until the output voltage reaches the safe voltage range, so that the power supply circuit works in a low-power state, and the aim of reducing the temperature is fulfilled. And (3) until the temperature is reduced to a preset temperature threshold value, the first voltage range is regulated back, and the power supply circuit works in a normal power state.
According to the embodiment of the invention, the adjustment mode of the first frequency is determined according to the magnitude relation between the first frequency information and the second frequency information and the relation between the first voltage information and the voltage range, specifically:
when the first voltage information is lower than the preset voltage range;
if the first frequency information is lower than the second frequency information, setting an adjustment mode of the first frequency information to be upward adjustment;
and if the first frequency information is not lower than the second frequency information, setting the adjustment mode of the first frequency information to be downward adjustment.
It should be noted that, according to the working principle of the LLC power supply, the resonant frequency is adjusted to adjust the output gain of the circuit, so as to achieve the purpose of adjusting the output voltage. When the first voltage information is lower than the preset voltage range, the output gain is required to be increased to increase the output voltage. In accordance with the basic principle that the higher the output gain of the circuit is when the resonance frequency is closer to the input power supply frequency, in order to increase the output voltage, it is necessary to set the resonance frequency closer to the input power supply frequency. That is, when the first frequency information is lower than the second frequency information, the first frequency information needs to be adjusted upwards to increase the output gain, so as to achieve the purpose of increasing the output voltage; when the first frequency information is not lower than the second frequency information, the first frequency information is required to be adjusted downwards to improve the output gain, so that the purpose of improving the output voltage is achieved.
According to the embodiment of the invention, the adjustment mode of the first frequency is determined according to the magnitude relation between the first frequency information and the second frequency information and the relation between the first voltage information and the voltage range, specifically:
when the first voltage information is higher than a preset voltage range;
if the first frequency information is lower than the second frequency information, setting an adjustment mode of the first frequency information to be downward adjustment;
and if the first frequency information is not lower than the second frequency information, setting the adjustment mode of the first frequency information to be upward adjustment.
The resonant frequency is adjusted according to the working principle of the LLC power supply, so that the purpose of adjusting the output voltage is achieved by adjusting the output gain of the circuit. When the first voltage information is higher than the preset voltage range, the output gain needs to be reduced to reduce the output voltage. The basic principle that the lower the output gain of a circuit is when the power supply frequency is input according to the principle that the resonance frequency is, the further the resonance frequency is required to be set from the input power supply frequency in order to lower the output voltage. That is, when the first frequency information is lower than the second frequency information, the first frequency information needs to be adjusted downward to reduce the output gain, so as to achieve the purpose of reducing the output voltage; when the first frequency information is not lower than the second frequency information, the first frequency information is required to be adjusted upwards to reduce the output gain, so that the purpose of reducing the output voltage is achieved.
According to the embodiment of the invention, the output adjustment is performed according to the adjustment mode, specifically:
when the adjustment mode of the first frequency information is downward adjustment, the first capacitance information is upward adjusted according to a preset first step according to a resonant frequency formula;
and when the adjustment mode of the first frequency information is upward adjustment, the first capacitance information is downward adjusted according to a preset first step according to a resonant frequency formula.
The resonant frequency calculation formula of the LLC power circuit is:
；
wherein:
a frequency value representing the resonance frequency, i.e. the first frequency information;
the circumference ratio is represented as a constant;
representing the inductance value of an inductor in the LLC power circuit;
representing a capacitance value of a capacitor in the LLC power supply circuit, i.e. a capacitance value of the first capacitance information;
as can be seen from the formula, when the first frequency information is to be adjusted downward, the capacitance value of the first capacitance information needs to be adjusted upward; when the first frequency information is to be adjusted upwards, the capacitance value of the first capacitance information needs to be adjusted downwards. The adjustment step is a level of capacitance variation when the digital tunable capacitor executes an adjustment instruction. Assuming that the digital tunable capacitor is divided into 100 capacitance levels, the preset first step is 5 levels, and if the current level is 50, the preset first step is adjusted upwards to be 55 th level, and the preset first step is adjusted downwards to be 45 th level.
According to an embodiment of the present invention, further comprising:
when the temperature information exceeds the preset temperature threshold value;
the preset safety voltage information adjusts a first voltage range, and the first capacitance information is adjusted downwards according to a preset second step;
and setting the mark information and entering a low power consumption mode.
When the temperature of the circuit increases, the characteristics of the components in the circuit change. When the circuit temperature exceeds a preset threshold, the circuit state is not suitable for continuously executing high-power output, and the first voltage range is set to be a preset safe voltage range, for example, 220V is the normal working voltage, and 110V is the preset safe voltage. The digitally tunable capacitor is then adjusted downward using a second step, which is a step of relatively large span level, causing the output voltage to drop rapidly. For example, assuming that the digitally tunable capacitor is divided into 100 capacitance levels, the second step may be 20 levels. And adjusting the output voltage until reaching a safe voltage range, so that the power supply circuit works in a low-power state, and the aim of cooling is fulfilled. In addition, the flag bit information is set to indicate that the power supply circuit is overheated and needs to enter into cooling protection, so that the system enters into a low-power consumption mode.
According to an embodiment of the present invention, further comprising:
the first capacitance information is a capacitance value of a digital tunable capacitor;
the digital adjustable capacitor is in communication connection with the digital adjustable capacitor through a preset communication instruction, and the digital adjustable capacitor comprises the steps of acquiring capacitance information of the digital adjustable capacitor through a capacitance value acquisition instruction and adjusting the capacitance information of the adjustable capacitor through a capacitance value adjustment instruction.
It should be noted that the digital tunable capacitor, also called a digital programmable capacitor, provides a capacitive bias adjustment function for the capacitive sensitive circuit. And reading the capacitance information of the digital adjustable capacitor through a preset communication instruction, and adjusting the capacitance information of the digital adjustable capacitor through the preset instruction.
It is worth mentioning that the method further comprises:
further comprises:
the first capacitance information is a capacitance value of a capacitor;
the capacitor consists of one or more capacitors, and the connection mode is series connection or parallel connection;
wherein at least one of the capacitors is a digitally tunable capacitor.
It should be noted that the capacitive device may achieve the effect of adjusting the overall capacitance by means of series connection or parallel connection.
In one embodiment, the capacitor of the first capacitance information is formed by connecting one or more capacitors in parallel, so that the range of the adjustment capacitance value is increased, and the effect of increasing the adjustment range of the resonance frequency is achieved. For example, the capacitor is formed by connecting an adjustable capacitor and a capacitor with a fixed capacitance in parallel, wherein the adjustable capacitor has an adjusting range of 0-100 capacitance units, the capacitor with the fixed capacitance has 50 capacitance units, and the capacitance range of the capacitor after the adjustable capacitor and the capacitor are connected in parallel is 50-150 capacitance units.
In one embodiment, the capacitor of the first capacitance information is formed by connecting one or more capacitors in series or in parallel, so that the adjustment output precision is improved, and the effect of improving the resonant frequency adjustment precision is achieved. For example, assuming an adjustment level of 100 for an adjustable capacitor, for an adjustable capacitor with an adjustment range of 0-200 capacitance units, the adjustment step is 2 capacitance units; two adjustable capacitors with the adjusting range of 0-100 capacitance units are used in parallel connection, the adjusting range after combination is 0-200 capacitance units, and the adjusting step is 1 capacitance unit.
It is worth mentioning that the method further comprises:
when output adjustment is carried out according to the adjustment mode;
recording the first step adjusted by the first capacitance information and the current first voltage information;
obtaining slope information of the change with time according to the first voltage information in the record;
and adjusting the first step according to the change slope.
When the output voltage is to be adjusted by adjusting the capacitor, the first voltage information is stored after each time the first voltage information is obtained. And establishing a coordinate system with a vertical axis as a voltage value and a horizontal axis as time according to the relation between the record of the first voltage information and the time axis, and drawing a change curve of the first voltage information. The slope of the curve may represent the rate of change of the voltage. After the capacitor is adjusted according to a preset first step, if the output voltage changes slowly, in order to increase the voltage change speed, the output voltage can be quickly adjusted to a preset voltage range, and the first step is increased and adjusted; if the output voltage changes too fast, the up-and-down reciprocating jitter changes are presented, which indicates that the fluctuation range of the output voltage is too large, and the first step needs to be reduced and adjusted.
It is worth mentioning that the method further comprises:
judging whether the temperature information exceeds a preset overtemperature protection threshold value or not;
if so, the digitally tunable capacitor is set to a minimum value, or in an off state.
It should be noted that, when the temperature of the power circuit exceeds the temperature threshold value and enters the safety voltage, the temperature still continues to rise, or the temperature directly rises due to a fault, if the temperature information of the power circuit exceeds the preset overtemperature protection threshold value, the power protection function is triggered. At this time, the first capacitance information of the digital adjustable capacitor is adjusted to the minimum value, or the digital adjustable capacitor with the disconnection function is set to enter the disconnection state and is used for bringing the output voltage to the minimum value, so that the risk of protecting the power circuit components from being burnt due to overhigh temperature is achieved.
A third aspect of the present invention provides a computer-readable storage medium having embodied therein a control method program for LLC power adaptively adjusted output, which when executed by a processor, implements the steps of a control method for LLC power adaptively adjusted output as described in any one of the preceding claims.
The invention provides a control method, a system and a storage medium for LLC power supply self-adaptive regulation output, when detecting that first voltage information is lower than or higher than a preset first voltage range, firstly, obtaining first frequency information according to first capacitance information, and obtaining second frequency information; then, according to the relation between the first voltage information and the voltage range and the magnitude relation between the first frequency information and the second frequency information, determining an adjustment mode of the first frequency information; finally, according to the relation between the temperature information and the preset temperature threshold value, the power supply output is adjusted; the effect of adaptively adjusting output and keeping output voltage stable according to the real-time state of the LLC power supply circuit is achieved; meanwhile, the components of the LLC power supply circuit are ensured to work in a safe temperature state, and the service life is prolonged.
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 this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A control method for adaptively adjusting output of an LLC power source, the method comprising:
acquiring first voltage information, and judging whether the first voltage information is in a preset first voltage range;
when the first voltage information is lower or higher than a preset first voltage range,
acquiring first capacitance information, and acquiring first frequency information according to the first capacitance information;
acquiring second frequency information;
determining an adjustment mode of the first frequency information according to the relation between the first voltage information and the voltage range and the magnitude relation between the first frequency information and the second frequency information;
the first capacitance information is a capacitance value of a digital tunable capacitor;
the method comprises the steps of obtaining capacitance information of the digital adjustable capacitor through a capacitance value obtaining instruction and adjusting the capacitance information of the adjustable capacitor through a capacitance value adjusting instruction;
The capacitor consists of one or more capacitors, and the connection mode is series connection or parallel connection;
wherein at least one capacitor is a digitally tunable capacitor;
recording a first step of the first capacitance information adjustment and the current first voltage information;
obtaining slope information of the change with time according to the first voltage information in the record;
adjusting the first step according to the change slope;
acquiring temperature information, and judging whether the temperature information exceeds a preset temperature threshold value;
if not, carrying out output adjustment according to the adjustment mode; if the voltage exceeds the preset safety voltage information, adjusting a first voltage range and adjusting output;
judging whether the temperature information exceeds a preset overtemperature protection threshold value or not;
if so, the digitally tunable capacitor is set to a minimum value, or in an off state.
2. The control method for adaptively adjusting output of an LLC power supply according to claim 1, wherein the adjustment mode of the first frequency is determined according to the magnitude relation between the first frequency information and the second frequency information, and the relation between the first voltage information and the voltage range, specifically:
when the first voltage information is lower than the preset voltage range;
If the first frequency information is lower than the second frequency information, setting an adjustment mode of the first frequency information to be upward adjustment;
and if the first frequency information is not lower than the second frequency information, setting the adjustment mode of the first frequency information to be downward adjustment.
3. The control method for adaptively adjusting output of an LLC power supply according to claim 1, wherein the adjustment mode of the first frequency is determined according to the magnitude relation between the first frequency information and the second frequency information, and the relation between the first voltage information and the voltage range, specifically:
when the first voltage information is higher than a preset voltage range;
if the first frequency information is lower than the second frequency information, setting an adjustment mode of the first frequency information to be downward adjustment;
and if the first frequency information is not lower than the second frequency information, setting the adjustment mode of the first frequency information to be upward adjustment.
4. The control method for adaptively adjusting output of an LLC power supply according to claim 1, wherein said performing output adjustment according to an adjustment mode includes:
when the adjustment mode of the first frequency information is downward adjustment, the first capacitance information is upward adjusted according to a preset first step according to a resonant frequency formula;
And when the adjustment mode of the first frequency information is upward adjustment, the first capacitance information is downward adjusted according to a preset first step according to a resonant frequency formula.
5. A control method for adaptively adjusting output of an LLC power source according to claim 1, further comprising:
when the temperature information exceeds the preset temperature threshold value;
the preset safety voltage information adjusts a first voltage range, and the first capacitance information is adjusted downwards according to a preset second step;
and setting the mark information and entering a low power consumption mode.
6. A control system for LLC power adaptive adjustment output, the system comprising a memory and a processor, the memory including a control method program for LLC power adaptive adjustment output, the control method program for LLC power adaptive adjustment output when executed by the processor implementing the steps of:
acquiring first voltage information, and judging whether the first voltage information is in a preset first voltage range;
when the first voltage information is lower or higher than a preset first voltage range,
acquiring first capacitance information, and acquiring first frequency information according to the first capacitance information;
Acquiring second frequency information;
determining an adjustment mode of the first frequency information according to the relation between the first voltage information and the voltage range and the magnitude relation between the first frequency information and the second frequency information;
the first capacitance information is a capacitance value of a digital tunable capacitor;
the method comprises the steps of obtaining capacitance information of the digital adjustable capacitor through a capacitance value obtaining instruction and adjusting the capacitance information of the adjustable capacitor through a capacitance value adjusting instruction;
the capacitor consists of one or more capacitors, and the connection mode is series connection or parallel connection;
wherein at least one capacitor is a digitally tunable capacitor;
recording a first step of the first capacitance information adjustment and the current first voltage information;
obtaining slope information of the change with time according to the first voltage information in the record;
adjusting the first step according to the change slope;
acquiring temperature information, and judging whether the temperature information exceeds a preset temperature threshold value;
if not, carrying out output adjustment according to the adjustment mode; if the voltage exceeds the preset safety voltage information, adjusting a first voltage range and adjusting output;
Judging whether the temperature information exceeds a preset overtemperature protection threshold value or not;
if so, the digitally tunable capacitor is set to a minimum value, or in an off state.
7. The control system for adaptively adjusting output of an LLC power supply according to claim 6, wherein said determining the adjustment mode of the first frequency according to the magnitude relation between the first frequency information and the second frequency information, and the relation between the first voltage information and the voltage range is specifically:
when the first voltage information is lower than the preset voltage range;
if the first frequency information is lower than the second frequency information, setting an adjustment mode of the first frequency information to be upward adjustment;
and if the first frequency information is not lower than the second frequency information, setting the adjustment mode of the first frequency information to be downward adjustment.
8. The control system for adaptively adjusting output of an LLC power supply according to claim 6, wherein said determining the adjustment mode of the first frequency according to the magnitude relation between the first frequency information and the second frequency information, and the relation between the first voltage information and the voltage range is specifically:
when the first voltage information is higher than a preset voltage range;
If the first frequency information is lower than the second frequency information, setting an adjustment mode of the first frequency information to be downward adjustment;
and if the first frequency information is not lower than the second frequency information, setting the adjustment mode of the first frequency information to be upward adjustment.
9. A computer readable storage medium having a computer program stored thereon, wherein the computer readable storage medium comprises a control method program for LLC power adaptive adjustment output, which when executed by a processor, implements the steps of the control method for LLC power adaptive adjustment output according to any one of claims 1 to 5.
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| CN111146949A (en) * | 2019-12-25 | 2020-05-12 | 中国长城科技集团股份有限公司 | Control method and system of LLC resonant circuit |
| CN114448270A (en) * | 2022-02-14 | 2022-05-06 | 厦门市爱维达电子有限公司 | Two-stage direct current conversion circuit, 5G base station power supply AC-DC converter and efficiency optimization method thereof |
| CN217469443U (en) * | 2022-03-09 | 2022-09-20 | 常州市创联电源科技股份有限公司 | Overtemperature and derating protection circuit for switching power supply |
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| GB2057168A (en) * | 1979-08-28 | 1981-03-25 | Hewlett Packard Co | Power supplies |
| CN108011499A (en) * | 2014-01-10 | 2018-05-08 | 雅达电子国际有限公司 | Use the control circuit and method of multiple and/or adjustable reference voltage adjustment output voltage |
| CN111146949A (en) * | 2019-12-25 | 2020-05-12 | 中国长城科技集团股份有限公司 | Control method and system of LLC resonant circuit |
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