CN113346594B - Charging circuit, control method of charging circuit, controller of charging circuit and charging pile - Google Patents

Charging circuit, control method of charging circuit, controller of charging circuit and charging pile Download PDF

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Publication number
CN113346594B
CN113346594B CN202110733397.5A CN202110733397A CN113346594B CN 113346594 B CN113346594 B CN 113346594B CN 202110733397 A CN202110733397 A CN 202110733397A CN 113346594 B CN113346594 B CN 113346594B
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China
Prior art keywords
circuit
preset
power factor
charging
factor correction
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CN202110733397.5A
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CN113346594A (en
Inventor
江冯林
张�杰
许林冲
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Sungrow Power Supply Co Ltd
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Sungrow Power Supply Co Ltd
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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/30—Constructional details of charging stations
    • B60L53/31—Charging columns specially adapted for electric vehicles
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/007188—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters
    • H02J7/007192—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208—Arrangements for improving power factor of AC input
    • H02M1/4241—Arrangements for improving power factor of AC input using a resonant converter
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J2207/20—Charging or discharging characterised by the power electronics converter
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/12—Electric charging stations

Abstract

The invention discloses a charging circuit, a control method of the charging circuit, a controller of the charging circuit and a charging pile, wherein the control method of the charging circuit comprises the following steps: acquiring the working temperature of the power factor correction circuit and the working temperature of the resonance circuit; and correspondingly adjusting the voltage value of the output voltage of the power factor correction circuit and the operating frequency of the resonant circuit according to the acquired operating temperature of the power factor correction circuit and the operating temperature of the resonant circuit. The technical scheme of the invention can enlarge the working temperature range of full power output of the charging circuit and the service life thereof.

Description

Charging circuit, control method of charging circuit, controller of charging circuit and charging pile
Technical Field
The invention relates to the technical field of charging piles, in particular to a charging circuit, a control method of the charging circuit, a controller of the charging circuit and a charging pile.
Background
At present, a PFC (power factor correction) circuit and an LLC (resonant) circuit are often adopted for a charging pile to construct a charging circuit, but the charging circuit needs to be maintained in a constant-power full-range output state along with different charging voltages required by different electric vehicles so as to meet the charging requirements of the different electric vehicles.
However, the existing charging circuit is to adjust the gain of the back-end LLC circuit to a fixed gain, and then to control the output voltage of the front-end PFC circuit to realize the constant-power full-range output adjustment of the charging circuit. Therefore, when the output voltage of the PFC circuit changes, the power tube of one of the PFC circuit and the LLC circuit can be heated too high, so that over-temperature protection of the charging circuit is triggered, the whole charging circuit is forced to perform derating work, and the working temperature range of the existing charging circuit capable of outputting full rated power is smaller.
Disclosure of Invention
The invention mainly aims to provide a charging circuit, which aims to solve the problem that the working temperature range of full power output of the existing charging circuit is smaller.
In order to achieve the above object, a control method of a charging circuit according to the present invention includes a power factor correction circuit for performing power factor correction on an input power supply signal and a resonance circuit for performing resonance conversion on the power factor corrected power supply signal, the control method of the charging circuit including the steps of:
acquiring the working temperature of the power factor correction circuit and the working temperature of the resonance circuit;
and correspondingly adjusting the voltage value of the output voltage of the power factor correction circuit and the operating frequency of the resonant circuit according to the acquired operating temperature of the power factor correction circuit and the operating temperature of the resonant circuit.
Optionally, the step of correspondingly adjusting the voltage value of the output voltage of the power factor correction circuit and the operating frequency of the resonant circuit according to the acquired operating temperature of the power factor correction circuit and the operating temperature of the resonant circuit includes:
comparing the acquired working temperature of the power factor correction circuit with a first preset temperature threshold value, and comparing the acquired working temperature of the resonant circuit with a second preset temperature threshold value;
respectively determining the output voltage regulating quantity of the power factor correction circuit and the working frequency regulating quantity of the resonant circuit according to the comparison result;
and correspondingly adjusting the voltage value of the output voltage of the power factor correction circuit according to the determined output voltage adjustment quantity, and correspondingly adjusting the working frequency of the resonant circuit according to the determined working frequency adjustment quantity.
Optionally, the step of determining the output voltage adjustment amount of the power factor correction circuit and the operating frequency adjustment amount of the resonant circuit according to the comparison result respectively specifically includes:
when the comparison result is that the working temperature of the power factor correction circuit is larger than a first preset temperature threshold value and the working temperature of the resonant circuit is smaller than a second preset temperature threshold value, determining the output voltage lowering amount of the power factor correction circuit according to the comparison result and a first preset formula under the condition that the total output power of the charging circuit is unchanged, and lowering the working frequency of the resonant circuit according to the comparison result and a second preset formula;
When the comparison result is that the working temperature of the power factor correction circuit is smaller than the first preset temperature threshold value and the working temperature of the resonant circuit is larger than the second preset temperature threshold value, under the condition that the total output power of the charging circuit is unchanged, determining the output voltage increasing amount of the power factor correction circuit according to the comparison result and a third preset formula, and determining the working frequency increasing amount of the resonant circuit according to the comparison result and a fourth preset formula.
Optionally, the first preset formula is the same as the third preset formula;
the first preset formula is: avbus=a1×tp2—a2×tp1, where a1 is a first preset voltage parameter and a2 is a second preset voltage parameter;
when the comparison result shows that the working temperature of the power factor correction circuit is larger than a first preset temperature threshold value, and the working temperature of the resonant circuit is smaller than a second preset temperature threshold value, and when Tp1 is assigned to be a first preset constant parameter, tp2 is assigned to be a second preset constant parameter, wherein Δvbus is smaller than or equal to zero, and the Δvbus is the working voltage reduction amount;
when the comparison result is that the working temperature of the power factor correction circuit is smaller than a first preset temperature threshold value and the working temperature of the resonant circuit is larger than a second preset temperature threshold value, assigning Tp1 as a second preset constant parameter, assigning Tp2 as a first preset constant parameter, wherein the delta Vbus is larger than or equal to zero, and the delta Vbus is the working voltage rising amount.
Optionally, the second preset formula is the same as the fourth preset formula;
the second preset formula is: Δfs=b1 Tp2-b2 Tp1, where b1 is a first preset frequency parameter and b2 is a second preset voltage parameter;
when the comparison result shows that the working temperature of the power factor correction circuit is larger than a first preset temperature threshold value and the working temperature of the resonant circuit is smaller than a second preset temperature threshold value, assigning Tp1 as a first preset constant parameter and assigning Tp2 as a second preset constant parameter, wherein Δfs is an output voltage lowering amount and is smaller than or equal to zero;
when the comparison result is that the working temperature of the power factor correction circuit is smaller than a first preset temperature threshold value and the working temperature of the resonant circuit is larger than a second preset temperature threshold value, assigning Tp1 as a second preset constant parameter and Tp2 as a first preset constant parameter, wherein Δfs is the output voltage heightening amount, and Δfs is larger than or equal to zero.
Optionally, the first preset constant parameter is one of 0 and 1, and the second preset constant parameter is the other of 0 and 1.
Optionally, after the step S210 of comparing the acquired operating temperature of the pfc circuit with the first preset temperature threshold and comparing the acquired operating temperature of the resonant circuit with the second preset temperature threshold, the method further includes:
When the comparison result is that the working temperature of the power factor correction circuit is larger than the first preset temperature threshold value and the working temperature of the resonance circuit is larger than the second preset temperature threshold value, correspondingly adjusting the voltage value of the output voltage of the power factor correction circuit and the working frequency of the resonance circuit so as to reduce the total output power of the charging circuit.
The present invention also proposes a controller of a charging circuit including a power factor correction circuit for performing power factor correction on an input power supply signal and a resonance circuit for performing resonance conversion on the power factor corrected power supply signal, the controller of the charging circuit including:
a memory;
a processor; and
a control program of a charging circuit stored on a memory and executable on a processor, which when executing the control program of the charging circuit implements the control method of the charging circuit as described above.
The invention also proposes a charging circuit comprising:
a power factor correction circuit for performing power factor correction on an input power supply signal;
the resonance circuit is used for carrying out resonance transformation on the power factor corrected power supply signal; the method comprises the steps of,
The controller of the charging circuit is connected with the power factor correction circuit and the resonance circuit respectively.
Optionally, the charging circuit further includes: the power factor correction controller is respectively in communication connection with the power factor correction circuit and the controller of the charging circuit and is used for controlling the power factor correction circuit to work;
alternatively, the controller of the charging circuit further includes: and the resonance controller is respectively in communication connection with the resonance circuit and the controller of the charging circuit, and is used for controlling the resonance circuit to work.
The invention also provides a charging pile which comprises a charging gun and the charging circuit;
the power input end of the charging gun is connected with the power output end of the charging circuit.
The control method of the charging circuit correspondingly adjusts the voltage value of the output voltage of the power factor correction circuit and correspondingly adjusts the working frequency of the resonant circuit according to the acquired working temperature of the power factor correction circuit and the working temperature of the resonant circuit. According to the technical scheme, when any one of the PFC circuit and the LLC circuit is over-heated, the over-heated work load is transferred to the other one without over-temperature, so that the working temperatures of the PFC circuit and the LLC circuit can be in dynamic balance.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flowchart illustrating a control method of a charging circuit according to an embodiment of the present invention;
FIG. 2 is a flowchart illustrating a control method of a charging circuit according to another embodiment of the present invention;
FIG. 3 is a flowchart illustrating a control method of a charging circuit according to another embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating a hardware operating environment of an embodiment of a controller for a charging circuit according to the present invention;
FIG. 5 is a schematic diagram of a circuit module of an embodiment of a charging circuit according to the present invention;
FIG. 6 is a schematic circuit diagram of another embodiment of a charging circuit according to the present invention;
fig. 7 is a schematic diagram of a control strategy according to an embodiment of a control method of the charging circuit of the present invention.
Reference numerals illustrate:
reference numerals Name of the name Reference numerals Name of the name
101 Memory device 221 LLC controller
102 Processor and method for controlling the same 220 LLC drive circuit
103 Communication bus C1、C2 Bus capacitor
210 PFC circuit A1、A2 Comparator with a comparator circuit
211 PFC controller U、V、W Three-phase input terminal
212 PFC driving circuit Vbus Bus voltage
220 LLC circuit Vo1、Vo2 Output voltage
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. 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.
Furthermore, descriptions such as those referred to as "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying an order of magnitude of the indicated technical features in the present disclosure. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
The invention provides a control method of a charging circuit, which can be realized by a controller of the charging circuit.
For convenience of description, the PFC circuit and the LLC circuit are used instead of the PFC circuit and the resonant circuit in this specification. The existing charging circuit is matched with the charging voltage of a charging load such as an electric automobile, the output voltage of the PFC circuit is kept unchanged, the working frequency of the LLC circuit is increased to the maximum working frequency, the gain of the LLC circuit to the output voltage of the PFC circuit is fixed, and the output voltage of the PFC circuit is regulated according to the charging voltage required by the charging load; the operating frequency of the LLC circuit is the switching frequency of the power tube therein, for example: after the operating frequency of the LLC circuit is increased to the highest operating frequency, the output voltage of the charging circuit is 1000V, the charging voltage required for charging the load is 500V, and the output voltage of the PFC circuit is reduced to enable the output voltage of the charging circuit to reach 500V. It should be noted that, the output voltage of the LLC circuit is determined by its input voltage (i.e., the output voltage of the PFC circuit) and its operating frequency, and in the case that its output voltage is constant, its input voltage and its operating frequency are combined in various ways, for example: when the output voltage of the LLC circuit is 650V, the input voltage of the LLC circuit can be 840V, and the working frequency of the LLC circuit can be 100 KHZ; alternatively, the input voltage may also be 810V and the operating frequency may also be 90 khz; alternatively, the input voltage may also be 780V, the operating frequency may also be 80 khz, etc., i.e. when the input voltage of the LLC circuit increases/decreases, its output voltage may be maintained constant by correspondingly adjusting the operating frequency of the LLC circuit.
In practical use, the working temperatures of the PFC circuit and the LLC circuit mainly come from heat generated when the power tube generates switching losses, and the working temperatures of the PFC circuit and the LLC circuit are too high to cause damage to the power tube, thereby affecting the working state of the charging circuit, so that over-temperature protection of the PFC circuit and the LLC circuit is required. In the prior art, when the working temperature of any one of the PFC circuit and the LLC circuit is detected to be too high, the whole charging circuit is forced to execute derating work, namely the rated output power of the charging circuit is reduced to carry out over-temperature protection on the PFC circuit and the LLC circuit, and the working temperature range of the charging circuit which can output full power with rated power is smaller although the damage of a power tube can be avoided. For charging equipment such as a charging pile which is used in outdoor occasions, the environment temperature is high, the influence on the working temperature range of a charging circuit is more serious, and after the derating work is performed, the charging power of the charging pile is reduced, so that the charging efficiency and the service life of the charging pile are very influenced. In order to further simplify the description, the power tube in the PFC circuit is denoted by "first power tube" and the power tube in the LLC circuit is denoted by "second power tube" in the present specification.
In order to solve the above problems, referring to fig. 1 to 7, in an embodiment of the present invention, the control method of the charging circuit includes the steps of:
step S100, acquiring the working temperature of the power factor correction circuit and the working temperature of the resonance circuit;
in this embodiment, the controller of the charging circuit may be connected to the output terminals of the temperature detection circuits of the PFC circuit and the LLC circuit, so as to access the temperature detection signals output by the temperature detection circuits, and may perform analysis processing on the temperature detection signals after converting them into digital signals, so as to obtain the operating temperatures of the PFC circuit and the LLC circuit in real time. In another embodiment, two paths of temperature detection circuits can be additionally arranged to realize temperature monitoring, and each temperature detection circuit can be realized by adopting a voltage division circuit constructed by an NTC resistance isothermal thermistor and a fixed value resistor, or can also be realized by adopting a special temperature sensor.
Step 200, correspondingly adjusting the voltage value of the output voltage of the power factor correction circuit and the operating frequency of the resonant circuit according to the acquired operating temperature of the power factor correction circuit and the operating temperature of the resonant circuit.
In this embodiment, a hardware circuit or a software program or an algorithm for comparison may be integrated in the controller of the charging circuit, and a plurality of preset temperature thresholds may be stored, so that after the working temperatures of the PFC circuit and the LLC circuit are obtained, the corresponding preset temperature thresholds may be invoked to compare with the corresponding working temperatures to determine whether the working temperatures of the PFC circuit and the LLC circuit are too high.
When the controller of the charging circuit determines that the working temperature of the PFC circuit is too high at the moment and the working temperature of the LLC circuit is normal, the controller of the charging circuit can enable the working temperature of the PFC to be reduced by adjusting the voltage value of the output voltage of the PFC, so that the PFC circuit is subjected to over-temperature heat preservation. The voltage value of the output voltage of the PFC circuit is increased/decreased, so that the total output voltage of the charging circuit is correspondingly increased/decreased, and the controller of the charging circuit can correspondingly adjust the working frequency of the LLC circuit, so that the working frequency of the LLC circuit after adjustment can be matched with the output voltage of the PFC circuit, and the charging circuit can maintain the total output voltage constant. When the controller of the charging circuit determines that the working temperature of the PFC circuit is normal at the moment and the working temperature of the LLC circuit is too high, the controller of the charging circuit can also enable the working temperature of the LLC circuit to be reduced by adjusting the voltage value of the output voltage of the PFC circuit, so that the LLC circuit is over-temperature protected. In order to maintain the total output voltage of the charging circuit constant, the controller of the charging circuit can also adjust the working frequency of the LLC circuit at the same time, so that the adjusted working frequency of the LLC circuit can be matched with the adjusted output voltage of the PFC circuit.
In practical application, when the output voltage of the PFC circuit is adjusted to reduce the operating temperature of the PFC circuit, the switching loss of the second power tube is increased and the operating temperature of the LLC circuit is increased; when the output voltage of the PFC circuit is adjusted to decrease the operating temperature of the LLC circuit, switching loss of the first power transistor increases and the operating temperature of the PFC circuit increases. According to the control method of the charging circuit, when the PFC circuit is over-heated, the workload which causes the over-temperature of the PFC circuit is transferred to the LLC circuit, so that the LLC circuit bears the heating value of the over-temperature part; when the LLC circuit is over-heated, the workload which causes the LLC circuit to be over-heated is transferred to the PFC circuit, so that the PFC circuit bears the heating value of the over-heated part. The circulating reciprocating mode is adopted, so that the working temperatures of the PFC circuit and the LLC circuit can be in dynamic balance, the situation that the charge circuit is forced to perform derating work when any one of the PFC circuit and the LLC circuit is over-heated in the prior art is avoided, the working temperature range of full power output of the charge circuit is greatly improved, and in the case of outdoor charge equipment such as a charge pile, the working stability of the outdoor charge equipment is improved, and the charge efficiency and the service life of the outdoor charge equipment are improved.
Referring to fig. 1 to 7, in an embodiment of the present invention, the step S200 of correspondingly adjusting the voltage value of the output voltage of the pfc circuit and the operating frequency of the resonant circuit according to the obtained operating temperature of the pfc circuit and the operating temperature of the resonant circuit includes:
step S210, comparing the acquired working temperature of the power factor correction circuit with a first preset temperature threshold value, and comparing the acquired working temperature of the resonant circuit with a second preset temperature threshold value;
in this embodiment, the first preset temperature threshold and the second preset temperature threshold may have a certain temperature margin, and represent critical temperature values of the damaged first power tube and the damaged second power tube respectively, which may be obtained through multiple pre-experiments, and are not limited herein. The controller of the charging circuit can compare the acquired working temperatures of the PFC circuit and the LLC circuit with a first preset temperature threshold and a second preset temperature threshold respectively, and can determine that the working temperature of the PFC circuit is too high and the working temperature of the LLC circuit is normal when the comparison result shows that the working temperature of the PFC circuit is larger than the first preset temperature threshold and the working temperature of the LLC is smaller than the second preset temperature threshold; and when the comparison result shows that the working temperature of the PFC circuit is smaller than the first preset temperature threshold and the working temperature of the LLC is larger than the second preset temperature threshold, determining that the working temperature of the PFC circuit is normal and the working temperature of the LLC circuit is too high.
Step S220, respectively determining the output voltage regulating quantity of the power factor correction circuit and the working frequency regulating quantity of the resonant circuit according to the comparison result;
in this embodiment, the controller of the charging circuit may store a plurality of temperature difference intervals, output voltage adjustment amounts of a plurality of PFC circuits, and operation frequency adjustment amounts of a plurality of LLC circuits, and the output voltage adjustment amount of each PFC circuit and the operation frequency adjustment amount of each LLC circuit may be stored in association with one temperature difference interval. The controller of the charging circuit may utilize a hardware circuit and a software program or algorithm integrated therein, such as a differential comparator, to obtain a comparison result respectively representing a difference between the operating temperature of the PFC circuit and a first preset temperature threshold value, and a comparison result representing a difference between the operating temperature of the LLC circuit and a second preset temperature threshold value, when comparing the operating temperatures of the PFC circuit and the LLC circuit with corresponding preset temperature threshold values. The controller of the charging circuit can also determine a matched temperature difference interval according to the obtained comparison results, and call the output voltage regulating quantity and the working frequency regulating quantity corresponding to the matched temperature difference interval. In another embodiment, the controller of the charging circuit may further calculate, in real time, an output voltage and an adjustment amount of the operating frequency corresponding to the comparison result according to each comparison result of the characterization difference and a corresponding preset formula. In still another embodiment, a comparator which can be built for a single operational amplifier and is integrated in a controller of the charging circuit may be pre-stored with a preset output voltage lowering amount, a preset operating frequency lowering amount, a preset output voltage raising amount and a preset operating frequency raising amount, so that when it is determined that the operating temperature of the PFC circuit or the LLC circuit is too high, the corresponding preset output voltage regulating amount and the corresponding preset operating frequency regulating amount may be directly called to control the PFC circuit and the LLC circuit to operate respectively. The preset output voltage regulating quantity and the preset working frequency regulating quantity can be set to be larger values, so that the PFC circuit and the LLC circuit can always keep better cooling efficiency, and the setting is also beneficial to reducing design cost.
Step S230, correspondingly adjusting the voltage value of the output voltage of the power factor correction circuit according to the determined output voltage adjustment amount, and correspondingly adjusting the working frequency of the resonant circuit according to the determined working frequency adjustment amount.
In this embodiment, the controller of the charging circuit may operate the hardware circuit and the software program or algorithm to output control signals for controlling the operations of the PFC circuit and the LLC circuit, respectively, according to the determined output voltage and the operation frequency adjustment amount, to control the PFC circuit to adjust its output voltage by a voltage value corresponding to the output voltage adjustment amount, and to control the LLC circuit to adjust its operation frequency by a frequency corresponding to the operation frequency adjustment amount, respectively. Thus, when the over-temperature of the PFC/LLC circuit is serious, the rapid cooling can be realized by determining a larger output voltage/working frequency regulating quantity, and when the over-temperature is not serious, the fine cooling can be realized by determining a smaller output voltage/working frequency regulating quantity, so that the stability of dynamic balance of the PFC circuit and the LLC circuit and the stability of the full-power output temperature range of the charging circuit are further improved.
Referring to fig. 1 to 7, in an embodiment of the present invention, the step S220 of determining the output voltage adjustment amount of the power factor correction circuit and the operating frequency adjustment amount of the resonant circuit according to the comparison result respectively specifically includes:
When the comparison result is that the working temperature of the power factor correction circuit is larger than a first preset temperature threshold value and the working temperature of the resonant circuit is smaller than a second preset temperature threshold value, determining the output voltage lowering amount of the power factor correction circuit according to the comparison result and a first preset formula under the condition that the total output power of the charging circuit is unchanged, and lowering the working frequency of the resonant circuit according to the comparison result and a second preset formula;
when the comparison result is that the working temperature of the power factor correction circuit is smaller than the first preset temperature threshold value and the working temperature of the resonant circuit is larger than the second preset temperature threshold value, under the condition that the total output power of the charging circuit is unchanged, determining the output voltage increasing amount of the power factor correction circuit according to the comparison result and a third preset formula, and determining the working frequency increasing amount of the resonant circuit according to the comparison result and a fourth preset formula.
In this embodiment, the working temperature change of the PFC circuit is proportional to the output voltage thereof, that is, the smaller the output voltage of the PFC circuit is, the smaller the loss of the first power tube is, and the lower the working temperature of the PFC circuit is; the larger the output voltage of the PFC circuit is, the larger the loss of the first power tube is, and the higher the working temperature of the PFC circuit is. According to the principle of constant power, the working temperature change of the LLC circuit is inversely proportional to the input voltage (namely the output voltage of the PFC circuit), namely the smaller the output voltage of the PFC circuit is, the larger the loss of the second power tube is, and the higher the working temperature of the LLC circuit is; the larger the output voltage of the PFC circuit is, the smaller the loss of the second power tube is, and the lower the working temperature of the LLC circuit is. Therefore, when the controller of the charging circuit determines that the working temperature of the PFC circuit is too high and the working temperature of the LLC circuit is normal, the determined output voltage regulating quantity is the output voltage regulating quantity, and the determined working frequency regulating quantity is the working frequency regulating quantity; when the working temperature of the PFC circuit is normal and the working temperature of the LLC circuit is too high, the determined output voltage regulating quantity is the output voltage regulating quantity, and the determined working frequency regulating quantity is the working frequency regulating quantity. The controller of the charging circuit may call corresponding preset voltage/frequency parameters and preset constant parameters according to comparison results of the working temperatures of the PFC circuit and the LLC circuit with the first preset temperature threshold and the second preset temperature threshold, respectively, and may operate a software algorithm or program that calculates the called preset voltage/frequency parameters and preset constant parameters according to corresponding preset formulas, so as to calculate the output voltage increasing/decreasing amount and the working frequency increasing/decreasing amount. Therefore, the dynamic balance of the temperatures of the PFC circuit and the LLC circuit can be realized, and the full-power output working temperature range of the charging circuit and the service life of the charging circuit can be improved.
Referring to fig. 1 to 7, in an embodiment of the present invention, the first preset formula is the same as the third preset formula;
the first preset formula is: avbus=a1×tp2—a2×tp1, where a1 is a first preset voltage parameter and a2 is a second preset voltage parameter;
when the comparison result shows that the working temperature of the power factor correction circuit is larger than a first preset temperature threshold value and the working temperature of the resonant circuit is smaller than a second preset temperature threshold value, assigning Tp1 as a first preset constant parameter, assigning Tp2 as a second preset constant parameter, wherein the delta Vbus is smaller than or equal to zero, and the delta Vbus is the lower regulating amount of the working voltage;
when the comparison result shows that the working temperature of the power factor correction circuit is smaller than the first preset temperature threshold value and the working temperature of the resonant circuit is larger than the second preset temperature threshold value, assigning Tp1 as a second preset constant parameter, assigning Tp2 as a first preset constant parameter, wherein the delta Vbus is larger than or equal to zero, and the delta Vbus is the working voltage rising amount.
In this embodiment, a1, a2, tp1 and Tp2 may be obtained by multiple preliminary experiments, and are not limited herein. The controller of the charging circuit may have a plurality of preset constant parameters pre-stored therein, so that when determining the amount of the output voltage to be reduced or increased, the corresponding preset constant parameter may be selected from the plurality of preset constant parameters and assigned to Tp1 according to a comparison result representing a difference between the working temperature of the PFC circuit and a first preset temperature threshold, and the corresponding preset constant parameter may be selected from the plurality of preset constant parameters and assigned to Tp2 according to a comparison result representing a difference between the working temperature of the LLC circuit and a second preset temperature threshold. Note that in the present embodiment, assignment of both Tp1 and Tp2 is determined when the output voltage is turned down by an amount, as opposed to assignment of both Tp1 and Tp2 when the output voltage is turned up by an amount. It should be noted that the parameters a1, a2, tp1 and Tp2,4 may be one or more of positive numbers, negative numbers or 0, respectively, which is not limited herein, but specific values of a1, a2, tp1 and Tp2 need to satisfy that the product result of a1 and Tp1 is less than or equal to the product result of a2×tp2 when determining the output voltage reduction amount, that is, the value of avbus is less than or equal to 0 at this time; when the output voltage is determined to be increased, the product result of a1 and Tp1 is greater than or equal to the product result of a2×Tt2, that is, the value of ΔVbus is greater than or equal to 0. It can be appreciated that in other alternative embodiments, the first preset formula and the third preset formula may be different formulas, so as to implement more accurate output voltage adjustment of the PFC circuit. According to the technical scheme, the first preset formula and the third preset formula are set to be the same, and assignment logic of TPI and TP2 is set to be opposite when the first preset formula and the third preset formula are calculated, so that the DeltaVbus has a plurality of adjusting gears, multi-gear cooling protection of the PFC circuit can be realized, the accuracy of temperature protection of the PFC circuit is improved, the probability of over-temperature damage of the first power tube is reduced, and the design cost and difficulty are reduced.
Referring to fig. 1 to 7, in an embodiment of the present invention, the second preset formula is the same as the fourth preset formula;
the second preset formula is: Δfs=b1 Tp2-b2 Tp1, where b1 is a first preset frequency parameter and b2 is a second preset voltage parameter;
when the comparison result shows that the working temperature of the power factor correction circuit is larger than a first preset temperature threshold value and the working temperature of the resonant circuit is smaller than a second preset temperature threshold value, assigning Tp1 as a first preset constant parameter, assigning Tp2 as a second preset constant parameter, wherein Δfs is the output voltage lowering amount, and Δfs is smaller than or equal to zero;
when the comparison result shows that the working temperature of the power factor correction circuit is smaller than the first preset temperature threshold value and the working temperature of the resonant circuit is larger than the second preset temperature threshold value, assigning Tp1 as a second preset constant parameter, assigning Tp2 as a first preset constant parameter, wherein Δfs is the output voltage heightening amount, and Δfs is larger than or equal to zero.
In this embodiment, b1 and b2 may be obtained by multiple preliminary experiments, which are not limited herein. When the controller of the charging circuit determines the lower or higher operating frequency, the controller can select the corresponding preset constant parameter from a plurality of preset constant parameters and assign the corresponding preset constant parameter to Tp1 according to the comparison result of the operating temperature of the PFC circuit and the first preset temperature threshold difference value, and can select the corresponding preset constant parameter from a plurality of preset constant parameters and assign the corresponding preset constant parameter to Tp2 according to the comparison result of the operating temperature of the LLC circuit and the second preset temperature threshold difference value. Note that in the present embodiment, assignment of both Tp1 and Tp2 is determined when the operation frequency is turned down by an amount, as opposed to assignment of both Tp1 and Tp2 is determined when the operation frequency is turned up by an amount. b1 and b2 may be one or more of positive number, negative number or 0, and are not limited herein, but specific values of b1, b2, tp1 and Tp2 need to satisfy the product result of b1 and Tp1 being smaller than or equal to the product result of b2×tp2 when determining the lower amount of the operating frequency, that is, the value of Δfs is smaller than or equal to 0; when the operation frequency is determined to be increased, the product result of b1 and Tp1 is greater than or equal to the product result of b2 and Tp2, namely the value of delta fs is greater than or equal to 0. It will be appreciated that in other alternative embodiments, the second preset formula and the fourth preset formula may also be different formulas, so as to implement more accurate adjustment of the operating frequency of the LLC circuit. According to the technical scheme, the second preset formula and the fourth preset formula are set to be the same, and the assignment logic of the TPI and the TP2 is set to be opposite when the second preset formula and the fourth preset formula are calculated, so that Δfs1 has the same number of adjustment gears as that of ΔVbus1, multi-gear cooling protection of an LLC circuit can be realized, the precision of temperature protection of the LLC circuit is improved, the probability of over-temperature damage of a second power tube is reduced, and the design cost is further reduced.
Referring to fig. 1 to 7, in an embodiment of the present invention, the first preset constant parameter is one of 0 and 1, and the second preset constant parameter is the other of 0 and 1.
In this embodiment, there are two assignment schemes, the first: when the first preset constant parameter is assigned to 1, the second preset constant parameter is assigned to 0; second kind: when the first preset constant parameter is assigned to 0, the second preset constant parameter is assigned to 1. When the first scheme is adopted, when the output voltage regulating down quantity and the working frequency regulating down quantity are determined, and a2 and b2 are not negative numbers, the delta Vbus1 and delta fs1 can be ensured to be smaller than or equal to 0; when the output voltage increasing amount and the working frequency increasing amount are determined, and both a1 and b1 are not negative numbers, the delta Vbus2 and delta fs2 can be ensured to be larger than 0, namely, at the moment, the a1, a2, b1 and b2 can be set to be non-complex, so that the design cost is further reduced.
Referring to fig. 1 to 7, in an embodiment of the present invention, after the step S210 of comparing the acquired operating temperature of the pfc circuit with the first preset temperature threshold and comparing the acquired operating temperature of the resonant circuit with the second preset temperature threshold, the method further includes:
And step 240, when the comparison result shows that the working temperature of the power factor correction circuit is greater than the first preset temperature threshold and the working temperature of the resonant circuit is greater than the second preset temperature threshold, correspondingly adjusting the voltage value of the output voltage of the power factor correction circuit and the working frequency of the resonant circuit so as to reduce the total output power of the charging circuit.
In this embodiment, when the comparison result is that the operating temperature of the PFC circuit is greater than the first preset temperature threshold and the operating temperature of the LLC is greater than the second preset temperature threshold, the controller of the charging circuit may determine that the operating temperatures of the PFC circuit and the LLC circuit are both too high at this time, but cannot transfer the operating temperature of the PFC circuit or the LLC circuit to the other for bearing. For this problem, the controller of the charging circuit may control the charging circuit to perform derating operation such that the rated output power of the charging circuit is reduced at this time and such that the operating temperatures of both the PFC circuit and the LLC circuit are reduced when it is determined that the operating temperatures of both the PFC circuit and the LLC circuit are excessively high. In this embodiment, derating includes, but is not limited to: the output voltage of the PFC circuit is adjusted to reduce its output power, and the operating frequency of the LLC circuit is adjusted to reduce its output power. It is understood that step 240 need only follow step 210. Therefore, the probability of damage of the first power tube and the second power tube due to over-temperature can be reduced to the minimum, and the service life of the charging circuit and the charging stability of the charging circuit are obviously improved.
The invention also provides a controller of the charging circuit, which can be used in the charging circuit.
A charging circuit including a power factor correction circuit for performing power factor correction on an input power supply signal and a resonance circuit for performing resonance conversion on the power factor corrected power supply signal, a controller of the charging circuit comprising:
a memory 101;
a processor 102; and
the control program of the charging circuit stored on the memory 101 and executable on the processor, and the processor 102 implements the control method of the charging circuit as described above when executing the control program of the charging circuit.
In this embodiment, the memory 101 may be a high-speed RAM memory or a stable memory (non-volatile memory), for example, a disk memory, and the memory 101 may be a storage device independent of the control device; the processor 102 may be a CPU. The memory 101 and the processor 102 are connected by a communication bus 103, which communication bus 103 may be a UART bus or an I2C bus. It will be appreciated that other related programs may be provided in the controller to drive other functional units and modules in the charging circuit to operate.
The invention further provides a charging circuit.
Referring to fig. 1 to 7, in an embodiment of the present invention, the charging circuit includes:
a power factor correction circuit 210 for performing power factor correction on an input power supply signal;
a resonant circuit 220 for performing resonant conversion on the power factor corrected power supply signal; the method comprises the steps of,
the controller of the charging circuit as described above is connected to the power factor correction circuit 210 and the resonance circuit 220, respectively.
In this embodiment, the PFC circuit 210 may be formed by using discrete electronic devices such as an inductance element, a switching device, and a diode; the switching device is the first power tube described in the application, and can be one or more combinations of IGBT or MOSFET. The PFC circuit 210 may include a rectifying circuit and a voltage conversion circuit, and the first power tube may be disposed in the voltage conversion circuit; the input end of the PFC circuit 210, i.e. the input end U, V, W in fig. 6, may be connected to a power signal in the form of three-phase ac voltage output by an ac power supply such as a utility power grid, and output to a rectifying circuit for rectification and conversion, so as to rectify the ac voltage into a dc voltage, and output to a voltage converting circuit therein for corresponding step-up or step-down conversion and output.
LLC circuit 220 may be implemented by discrete electronic components such as switching devices, transformers, diodes, resistors, capacitors, etc.; the switching device is the second power tube described in the application, and can be one or more combinations of IGBT or MOSFET. The LLC circuit 220 may be connected to the dc voltage output by the PFC circuit 210 via positive and negative voltage buses, and may regulate the dc voltage by controlling the switching frequency of each power tube therein, and may output the regulated dc voltage as the output voltage Vo of the charging circuit. It can be understood that the LLC circuit 220 may further include a modulation circuit, such as a chopper circuit, for modulating the voltage output from the LLC circuit 220, such as chopping, and outputting the modulated voltage as the output voltage Vo of the charging circuit. In the embodiment shown in fig. 6, vbus is the bus voltage and is also the output voltage of PFC circuit 210; the number of the LLC circuits 220 is two, the two LLC circuits 220 are arranged in series, wherein the positive electrode input end of the first LLC circuit 220 is connected with a positive voltage bus ("+" in fig. 6), the negative electrode input end of the second LLC circuit 220 is connected with a negative voltage bus ("-" in fig. 6), two bus capacitors (C1 and C2) which are connected in series with each other are arranged between the positive voltage bus and the negative voltage bus, and the common point of the two bus capacitors is respectively connected with the negative electrode input end of the first LLC circuit 220 and the positive electrode input end of the second LLC circuit 220; the bus capacitors (C1, C2) are used to provide a pure dc voltage to the two LLC circuits 220. In the embodiment shown in fig. 6, one of the LLC circuits 220 has an output voltage Vo1, the other LLC circuit 220 has an output voltage Vo2, and Vo1 and Vo2 can be output to a battery in the charging load via an output series/parallel relay. In another alternative embodiment, the two-way LLC circuit 220 may also be arranged in parallel.
Since the charging circuit includes the controller of the charging circuit described above; the detailed structure of the controller of the charging circuit can refer to the above embodiments, and will not be described herein again; it can be understood that, since the controller of the charging circuit is used in the charging circuit, the embodiment of the charging circuit includes all the technical schemes of all the embodiments of the controller of the charging circuit, and the achieved technical effects are identical, and are not described herein again. The controller of the charging circuit is used to control the PFC circuit 210 and the LLC circuit 220 to operate.
Referring to fig. 1 to 7, in an embodiment of the present invention, the charging circuit further includes: the power factor correction controller is respectively in communication connection with the power factor correction circuit and the controller of the charging circuit and is used for controlling the power factor correction circuit to work;
alternatively, the controller of the charging circuit further includes: and the resonance controller is respectively in communication connection with the resonance circuit and the controller of the charging circuit, and is used for controlling the resonance circuit to work.
For simplicity of description, the PFC controller 211 is used as the PFC controller and the LLC controller 221 is used as the resonant electric controller in place of the description in this specification. The PFC controller 211 and the LLC controller 221 may be implemented by a microprocessor such as an MCU, a DSP, or an FPGA, or may be implemented by a dedicated main control chip. When the charging circuit further includes the PFC controller 211, the controller of the charging circuit may obtain, by using the PFC controller 211, a temperature detection signal output by the temperature detection circuit in the PFC circuit 210, and may feedback and output the determined output voltage up-regulation amount or output voltage down-regulation amount to the PFC circuit 210, so that the PFC controller 211 controls the output voltage of the PFC circuit 210 to correspondingly increase or decrease, which is equivalent to integrating the controller of the charging circuit with the LLC controller 221 at this time. When the charging circuit further includes the LLC controller 221, the controller of the charging circuit may obtain, by using the LLC controller 221, a temperature detection signal output by a temperature detection circuit in the LLC circuit 220, and may feedback and output the determined output voltage by an amount equal to or lower than the output voltage to the LLC circuit 220, so that the LLC controller 221 controls the output voltage of the LLC circuit 220 to correspondingly increase or decrease, which is equivalent to integrating the controller of the charging circuit with the PFC controller 211.
In the embodiment shown in fig. 7, the controller of the charging circuit may be integrally provided with the PFC controller 211 or the LLC controller 221, and this is explained by taking the case that the controller of the charging circuit is integrally provided with the LLC controller 221 as an example. In this embodiment, temp1 may be a first temperature detection signal output by a temperature detection circuit in PFC, tref1 may be a first preset temperature threshold, temp1 may be a second temperature detection signal output by a temperature detection circuit in LLC, tref2 may be a second preset temperature threshold; the non-inverting input terminal of the comparator A1 can be connected with Temp1, the inverting input terminal of the comparator A1 can be connected with Tref1 to compare Temp1 with Tref1, and can output a high-level signal when Temp1 is larger than Tref1, and output a low-level signal when Temp1 is smaller than Tref 1. The non-inverting input terminal of the comparator A2 is connected with Temp2, the inverting input terminal is connected with Tref2, and the comparator A2 is used for comparing Temp2 with Tref2 and outputting a high-level signal when Temp2 is larger than Tref2 and outputting a low-level signal when Temp2 is smaller than Tref 2. The PFC controller 211 may communicate the output signal of the comparator A1 to the LLC controller 221 such that the LLC controller 221 may determine the temperature conditions of the PFC and LLC circuits based on the output signals of the comparator A1 and the comparator A2, and determine the corresponding output voltage turndown/turnup amounts and operating frequency turndown/turnup amounts. The LLC controller 221 may output the determined output voltage down/up amount back to the PFC controller 211, so that the PFC controller 211 may control the PFC driving circuit 212 to drive the PFC circuit to correspondingly raise/lower its output voltage value, and may directly control the LLC driving circuit 222 to drive the LLC circuit to correspondingly raise/lower its operating frequency. Since the working principle and logic of the controller of the charging circuit and the PFC controller 211 are integrally provided with reference to the above embodiments, a detailed description thereof will be omitted. Of course, it is understood that the comparators (A1, A2) may also be integrated in the PFC controller 211 and the LLC controller 221, respectively.
In another alternative embodiment, the charging circuit does not comprise a PFC controller 211 and an LLC controller 221, i.e. both PFC controller 211 and LLC controller 221 are integrated in the controller of the charging circuit at this time. In yet another alternative embodiment, the charging circuit includes a PFC controller 211 and an LLC controller 221, i.e., the controller of the charging circuit, the PFC controller 211, and the LLC controller 221 are independently disposed, and two of the three are communicatively connected to each other. In practical applications, the charging circuit generally adopts the design concept that the PFC controller 211 and the LLC controller 221 are independently set, but the PFC controller 211 and the LLC controller 221 are generally designed by different design teams, so that in order to facilitate communication with controllers designed by other teams and reduce programming cost, the existing PFC controller 211 and LLC controller 221 can only judge whether the PFC or LLC circuit corresponding to itself is over-temperature, and when the over-temperature is identified, only control the PFC210 or LLC circuit 220 corresponding to itself to perform derating operation, and communicate with another controller to trigger the other controller to control the corresponding circuit to perform derating operation. The technical scheme overcomes the design defect in the industry, and the working temperatures of the PFC circuit 210 and the LLC circuit 220 can be more reasonably controlled by linking the PFC controller 211 and the LLC controller 221, so that the temperature range of full power output of the charging circuit and the service life of the charging circuit are greatly improved.
The invention also provides a charging pile body, which comprises a charging gun and a charging circuit, and the specific structure of the charging circuit refers to the embodiment, and because the charging pile body adopts all the technical schemes of all the embodiments, the charging pile body at least has all the beneficial effects brought by the technical schemes of the embodiments, and the detailed description is omitted. The power input end of the charging gun is connected with the power output end of the charging circuit.
The power input end of the charging gun can be connected with the output voltage Vo output by the charging circuit and is used for charging a battery in a charging load when the charging gun is inserted into a charging interface of the charging load of an electric automobile and the like.
The foregoing description is only of the optional embodiments of the present invention, and is not intended to limit the scope of the invention, and all the equivalent structural changes made by the description of the present invention and the accompanying drawings or the direct/indirect application in other related technical fields are included in the scope of the invention.

Claims (9)

1. A control method of a charging circuit including a power factor correction circuit for performing power factor correction on an input power supply signal and a resonance circuit for performing resonance conversion on the power factor corrected power supply signal, characterized by comprising the steps of:
Acquiring the working temperature of the power factor correction circuit and the working temperature of the resonance circuit;
comparing the acquired working temperature of the power factor correction circuit with a first preset temperature threshold value, and comparing the acquired working temperature of the resonant circuit with a second preset temperature threshold value;
when the comparison result is that the working temperature of the power factor correction circuit is larger than a first preset temperature threshold value and the working temperature of the resonant circuit is smaller than a second preset temperature threshold value, determining the output voltage lowering amount of the power factor correction circuit according to the comparison result and a first preset formula under the condition that the total output power of the charging circuit is unchanged, and determining the working frequency lowering amount of the resonant circuit according to the comparison result and a second preset formula;
when the comparison result is that the working temperature of the power factor correction circuit is smaller than the first preset temperature threshold value and the working temperature of the resonant circuit is larger than the second preset temperature threshold value, determining the output voltage increasing amount of the power factor correction circuit according to the comparison result and a third preset formula under the condition that the total output power of the charging circuit is unchanged, and determining the working frequency increasing amount of the resonant circuit according to the comparison result and a fourth preset formula;
And correspondingly adjusting the voltage value of the output voltage of the power factor correction circuit according to the determined output voltage adjustment quantity, and correspondingly adjusting the working frequency of the resonant circuit according to the determined working frequency adjustment quantity.
2. The method of controlling a charging circuit according to claim 1, wherein the first preset formula is the same as a third preset formula;
the first preset formula is: avbus=a1×tp2—a2×tp1, where a1 is a first preset voltage parameter and a2 is a second preset voltage parameter;
when the comparison result shows that the working temperature of the power factor correction circuit is larger than a first preset temperature threshold value, and the working temperature of the resonant circuit is smaller than a second preset temperature threshold value, and when Tp1 is assigned to be a first preset constant parameter, tp2 is assigned to be a second preset constant parameter, wherein Δvbus is smaller than or equal to zero, and the Δvbus is the working voltage reduction amount;
when the comparison result is that the working temperature of the power factor correction circuit is smaller than a first preset temperature threshold value and the working temperature of the resonant circuit is larger than a second preset temperature threshold value, assigning Tp1 as a second preset constant parameter, assigning Tp2 as a first preset constant parameter, wherein the delta Vbus is larger than or equal to zero, and the delta Vbus is the working voltage rising amount.
3. The method of controlling a charging circuit according to claim 1, wherein the second preset formula is the same as the fourth preset formula;
the second preset formula is: Δfs=b1 Tp2-b2 Tp1, where b1 is a first preset frequency parameter and b2 is a second preset voltage parameter;
when the comparison result shows that the working temperature of the power factor correction circuit is larger than a first preset temperature threshold value and the working temperature of the resonant circuit is smaller than a second preset temperature threshold value, assigning Tp1 as a first preset constant parameter and assigning Tp2 as a second preset constant parameter, wherein Δfs is an output voltage lowering amount and is smaller than or equal to zero;
when the comparison result is that the working temperature of the power factor correction circuit is smaller than a first preset temperature threshold value and the working temperature of the resonant circuit is larger than a second preset temperature threshold value, assigning Tp1 as a second preset constant parameter and Tp2 as a first preset constant parameter, wherein Δfs is the output voltage heightening amount, and Δfs is larger than or equal to zero.
4. A control method of a charging circuit according to claim 2 or 3, wherein the first preset constant parameter is one of 0 and 1, and the second preset constant parameter is the other of 0 and 1.
5. The method of controlling a charging circuit according to claim 1, wherein after the step of comparing the obtained operating temperature of the power factor correction circuit with a first preset temperature threshold value and comparing the obtained operating temperature of the resonant circuit with a second preset temperature threshold value, further comprising:
when the comparison result is that the working temperature of the power factor correction circuit is larger than the first preset temperature threshold value and the working temperature of the resonance circuit is larger than the second preset temperature threshold value, correspondingly adjusting the voltage value of the output voltage of the power factor correction circuit and the working frequency of the resonance circuit so as to reduce the total output power of the charging circuit.
6. A controller of a charging circuit including a power factor correction circuit for performing power factor correction on an input power supply signal and a resonance circuit for performing resonance conversion on the power factor corrected power supply signal, the controller of the charging circuit comprising:
a memory;
a processor; and
a control program of a charging circuit stored on a memory and executable on a processor, said processor implementing a control method of a charging circuit according to any one of claims 1-5 when executing said control program of a charging circuit.
7. A charging circuit, the charging circuit comprising:
a power factor correction circuit for performing power factor correction on an input power supply signal;
the resonance circuit is used for carrying out resonance transformation on the power factor corrected power supply signal; the method comprises the steps of,
the controller of the charging circuit of claim 6, the controller of the charging circuit being connected to the power factor correction circuit and the resonant circuit, respectively.
8. The charging circuit of claim 7, wherein the charging circuit further comprises: the power factor correction controller is respectively in communication connection with the power factor correction circuit and the controller of the charging circuit and is used for controlling the power factor correction circuit to work;
alternatively, the controller of the charging circuit further includes: and the resonance controller is respectively in communication connection with the resonance circuit and the controller of the charging circuit, and is used for controlling the resonance circuit to work.
9. A charging post, characterized in that the charging post comprises a charging gun and a charging circuit according to any one of claims 7-8;
the power input end of the charging gun is connected with the power output end of the charging circuit.
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