CN113346594A - 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
CN113346594A
CN113346594A CN202110733397.5A CN202110733397A CN113346594A CN 113346594 A CN113346594 A CN 113346594A CN 202110733397 A CN202110733397 A CN 202110733397A CN 113346594 A CN113346594 A CN 113346594A
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China
Prior art keywords
circuit
preset
power factor
factor correction
charging
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Granted
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CN202110733397.5A
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Chinese (zh)
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CN113346594B (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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    • 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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Dc-Dc Converters (AREA)

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 a power factor correction circuit and the working temperature of a resonance circuit; and correspondingly adjusting the voltage value of the output voltage of the power factor correction circuit according to the acquired working temperature of the power factor correction circuit and the working temperature of the resonance circuit, and correspondingly adjusting the working frequency of the resonance circuit. The technical scheme of the invention can enlarge the working temperature range of the full power output of the charging circuit and prolong the service life of the charging circuit.

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 the charging pile.
Background
At present, a charging circuit in a charging pile is usually constructed by a PFC (power factor correction) circuit and an LLC (resonance control) 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 different electric vehicles.
However, in the conventional charging circuit, the gain of the rear-end LLC circuit is first adjusted to a fixed gain, and then the constant-power full-range output adjustment of the charging circuit is realized by controlling the output voltage of the front-end PFC circuit. Therefore, when the output voltage of the PFC circuit changes, the power tube of one of the PFC circuit and the LLC circuit generates heat too high, over-temperature protection of the charging circuit is triggered, the whole charging circuit is forced to execute derating work, and the working temperature range of the existing charging circuit capable of outputting full power at rated power is smaller.
Disclosure of Invention
The invention mainly aims to provide a charging circuit, and aims to solve the problem that the working temperature range of the existing charging circuit at full power output is small.
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 signal and a resonant circuit for performing resonant conversion on the power factor-corrected power signal, and includes the steps of:
acquiring the working temperature of a power factor correction circuit and the working temperature of a resonance circuit;
and correspondingly adjusting the voltage value of the output voltage of the power factor correction circuit according to the acquired working temperature of the power factor correction circuit and the working temperature of the resonance circuit, and correspondingly adjusting the working frequency of the resonance circuit.
Optionally, the step of correspondingly adjusting the voltage value of the output voltage of the power factor correction circuit according to the obtained operating temperature of the power factor correction circuit and the operating temperature of the resonant circuit, and correspondingly adjusting the operating frequency 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 resonance 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 amount, and correspondingly adjusting the working frequency of the resonant circuit according to the determined working frequency adjustment amount.
Optionally, the step of determining the output voltage adjustment amount of the power factor correction circuit and the working frequency adjustment amount of the resonant circuit according to the comparison result respectively includes:
when the comparison result shows that the working temperature of the power factor correction circuit is greater than a first preset temperature threshold and the working temperature of the resonant circuit is less than a second preset temperature threshold, under the condition that the total output power of the charging circuit is kept unchanged, the output voltage reduction amount of the power factor correction circuit is determined according to the comparison result and a first preset formula, and the working frequency reduction amount of the resonant circuit is determined according to the comparison result and a second preset formula;
and when the comparison result shows that the working temperature of the power factor correction circuit is smaller than a first preset temperature threshold and the working temperature of the resonant circuit is larger than a second preset temperature threshold, under the condition that the total output power of the charging circuit is not changed, determining the output voltage adjustment amount of the power factor correction circuit according to the comparison result and a third preset formula, and determining the working frequency adjustment amount of the resonant circuit according to the comparison result and a fourth preset formula.
Optionally, the first preset formula is the same as a third preset formula;
the first preset formula is as follows: Δ Vbus-a 1 Tp2-a2 Tp1, wherein 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 greater than a first preset temperature threshold value and the working temperature of the resonant circuit is less than a second preset temperature threshold value and Tp1 is assigned as a first preset constant parameter, assigning TP2 as a second preset constant parameter, wherein the delta Vbus is less than or equal to zero and is the working voltage reduction amount;
and when the comparison result is that the working temperature of the power factor correction circuit is less than a first preset temperature threshold value and the working temperature of the resonant circuit is greater than a second preset temperature threshold value, assigning Tp1 as a second preset constant parameter, assigning Tp2 as the first preset constant parameter, wherein the delta Vbus is greater than or equal to zero, and the delta Vbus is the working voltage adjustment amount.
Optionally, the second preset formula is the same as a fourth preset formula;
the second preset formula is as follows: Δ fs is b1 Tp2-b2 Tp1, wherein 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 greater than a first preset temperature threshold and the working temperature of the resonant circuit is less than a second preset temperature threshold, assigning Tp1 as a first preset constant parameter, and assigning TP2 as a second preset constant parameter, wherein Δ fs is the output voltage reduction amount, and is less 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 assigning Tp2 as a first preset constant parameter, wherein Δ fs is an output voltage adjustment amount, and Δ fs 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 obtained operating temperature of the power factor correction circuit with a first preset temperature threshold and comparing the obtained operating temperature of the resonant circuit with a second preset temperature threshold, the method further includes:
and when the comparison result shows that the working temperature of the power factor correction circuit is greater than a first preset temperature threshold and the working temperature of the resonance circuit is greater than a 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 resonance circuit so as to reduce the total output power of the charging circuit.
The present invention also provides a controller of a charging circuit, the charging circuit including a power factor correction circuit for performing power factor correction on an input power signal and a resonance circuit for performing resonance conversion on the power factor-corrected power signal, the controller of the charging circuit including:
a memory;
a processor; and
a control program for a charging circuit stored on a memory and executable on a processor, the processor implementing the control method for a charging circuit as described above when executing the control program for the charging circuit.
The present invention further provides a charging circuit, including:
the power factor correction circuit is used for carrying out power factor correction on an input power supply signal;
the resonance circuit is used for performing resonance transformation on the power supply signal subjected to power factor correction; and the number of the first and second groups,
the controller of the charging circuit is connected to the power factor correction circuit and the resonant circuit respectively.
Optionally, 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 comprises: and the resonance controller is in communication connection with the resonance circuit and the controller of the charging circuit respectively, 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;
and the power supply input end of the charging gun is connected with the power supply output end of the charging circuit.
The control method of the charging circuit of the invention correspondingly adjusts the voltage value of the output voltage of the power factor correction circuit and correspondingly adjusts the working frequency of the resonance circuit by acquiring the working temperature of the power factor correction circuit and the working temperature of the resonance circuit and according to the acquired working temperature of the power factor correction circuit and the working temperature of the resonance circuit. According to the technical scheme, when either one of the PFC circuit and the LLC circuit is over-temperature, the workload causing over-temperature 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, compared with the prior art, the working temperature range of full power output of the charging circuit is greatly improved, and the working stability, the charging efficiency and the service life of outdoor charging equipment such as a charging pile are obviously improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
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 diagram illustrating a hardware operating environment of an embodiment of a controller of the charging circuit according to the present invention;
FIG. 5 is a schematic circuit diagram of a charging circuit according to an embodiment of the present invention;
FIG. 6 is a schematic circuit diagram of a charging circuit according to another embodiment of the present invention;
fig. 7 is a schematic diagram of a control strategy according to an embodiment of the control method of the charging circuit of the present invention.
The reference numbers illustrate:
reference numerals Name (R) Reference numerals Name (R)
101 Memory device 221 LLC controller
102 Processor with a memory having a plurality of memory cells 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 drive circuit Vbus Bus voltage
220 LLC circuit Vo1、Vo2 Output voltage
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of 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 as the power factor correction circuit and the resonant circuit in this specification, respectively. For example, the output voltage of the PFC circuit in the charging circuit is kept unchanged, and the operating frequency of the LLC circuit is increased to the maximum operating frequency, so that the gain of the LLC circuit for the output voltage of the PFC circuit is a fixed gain, and then the output voltage of the PFC circuit is adjusted according to the charging voltage required by the charging load; the working frequency of the LLC circuit is the switching frequency of the power tube therein, for example: after the working frequency of the LLC circuit is increased to the highest working frequency, the output voltage of the charging circuit is 1000V, the charging voltage required by the charging load is 500V, and then the output voltage of the PFC circuit is reduced so that the output voltage of the charging circuit reaches 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 under the condition that its output voltage is constant, its input voltage and its operating frequency have various combinations, for example: when the output voltage of the LLC circuit is 650V, the input voltage of the LLC circuit may be 840V, and its operating frequency may be 100 khz; or, the input voltage can also be 810V, and the working frequency can also be 90 HZ; 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 operating temperatures of the PFC circuit and the LLC circuit mainly come from heat generated when the power tube generates switching loss, and the operating temperatures of the PFC circuit and the LLC circuit are too high, which may cause the power tube to be damaged, thereby affecting the operating state of the charging circuit, and therefore, the PFC circuit and the LLC circuit need to be protected from over-temperature. 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 perform derating operation, that is, the rated output power of the charging circuit is reduced to perform over-temperature protection on the PFC circuit and the LLC circuit, so that the charging circuit can output full power at the rated power within a smaller working temperature range although the power tube is prevented from being damaged. For the charging equipment of this kind of multi-purpose outdoor occasion of filling electric pile, ambient temperature is higher, and is more serious to wherein charging circuit operating temperature scope's influence, and after carrying out derating work, fills electric pile's charging power and descends, very influences charge efficiency and life-span. 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 this specification.
To solve the above problem, referring to fig. 1 to 7, in an embodiment of the present invention, a method for controlling a charging circuit includes the following steps:
s100, acquiring the working temperature of a power factor correction circuit and the working temperature of a resonance circuit;
in this embodiment, the controller of the charging circuit may be connected to the output ends 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 analyze and process the temperature detection signals after converting the temperature detection signals 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 temperature detection circuits may be additionally provided to implement temperature monitoring, and each temperature detection circuit may be implemented by using a voltage division circuit constructed by an NTC resistor and a constant-value resistor, or may be implemented by using a dedicated temperature sensor.
And S200, correspondingly adjusting the voltage value of the output voltage of the power factor correction circuit according to the acquired working temperature of the power factor correction circuit and the working temperature of the resonance circuit, and correspondingly adjusting the working frequency of the resonance circuit.
In this embodiment, a hardware circuit, a software program, or an algorithm for comparison may be further integrated in the controller of the charging circuit, and a plurality of preset temperature thresholds are stored, so that after the working temperatures of the PFC circuit and the LLC circuit are obtained, the corresponding preset temperature thresholds may be called to compare with the corresponding working temperatures, so as 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 reduce the working temperature of the PFC by adjusting the voltage value of the output voltage of the PFC, so that the over-temperature heat preservation is carried out on the PFC circuit. And because the voltage value of the output voltage of the PFC circuit is increased/decreased, the total output voltage of the charging circuit is correspondingly increased/decreased, and aiming at the phenomenon, the controller of the charging circuit can correspondingly adjust the working frequency of the LLC circuit, so that the working frequency adjusted by the LLC circuit can be matched with the output voltage adjusted by the PFC circuit, and further the charging circuit can maintain the total output voltage to be 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 overhigh, the controller of the charging circuit can also reduce the working temperature of the LLC circuit by adjusting the voltage value of the output voltage of the PFC circuit, so that the LLC circuit is subjected to overtemperature protection. And in order to keep 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 working frequency adjusted by the LLC circuit can be matched with the output voltage adjusted by the PFC circuit.
In practical application, when the output voltage of the PFC circuit is adjusted to decrease 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, the switching loss of the first power transistor is increased and the operating temperature of the PFC circuit is increased. According to the control method of the charging circuit, when the PFC circuit is over-temperature, the workload which causes the over-temperature of the PFC circuit is transferred to the LLC circuit, so that the LLC circuit bears the heat productivity of the over-temperature part; when the LLC circuit is over-temperature, the workload causing the LLC circuit to be over-temperature is transferred to the PFC circuit, so that the PFC circuit bears the heat productivity of the over-temperature part. The circulation is reciprocal for the operating temperature of PFC circuit and LLC circuit can be in dynamic balance, has avoided prior art when any in PFC circuit and LLC circuit is too warm, is compelled to carry out derating work with regard to control charging circuit, very big improvement charging circuit full power output's operating temperature scope, and to filling this type of outdoor charging equipment of electric pile, be favorable to improving its job stabilization nature and with its charge efficiency and life-span.
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 power factor correction circuit according to the acquired operating temperature of the power factor correction circuit and the operating temperature of the resonant circuit, and correspondingly adjusting the operating frequency 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 respectively represent the damaged critical temperature values of the first power tube and the second power tube, which may be obtained through multiple preliminary 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 greater than the first preset temperature threshold and the working temperature of the LLC circuit is less than the second preset temperature threshold; and when the comparison result shows that the working temperature of the PFC circuit is smaller than a first preset temperature threshold value and the working temperature of the LLC circuit is larger than a second preset temperature threshold value, 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 resonance circuit according to the comparison result;
in this embodiment, a controller of the charging circuit may store a plurality of temperature difference intervals, a plurality of output voltage adjustment amounts of the PFC circuits, and a plurality of operating frequency adjustment amounts of the LLC circuits, and the output voltage adjustment amount of each PFC circuit and the operating frequency adjustment amount of each LLC circuit may be stored in association with one temperature difference interval. When the operating temperatures of the PFC circuit and the LLC circuit are compared with the corresponding preset temperature thresholds, the controller of the charging circuit can obtain comparison results respectively representing the difference value between the operating temperature of the PFC circuit and the first preset temperature threshold and the comparison results representing the difference value between the operating temperature of the LLC circuit and the second preset temperature threshold by utilizing hardware circuits such as a differential comparator and software programs or algorithms integrated in the controller. The controller of the charging circuit can also determine a matched temperature difference interval according to each obtained comparison result, and call an output voltage regulating quantity and a 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 operating frequency adjustment corresponding to each comparison result of the characterization difference values and a corresponding preset formula. In another embodiment, a comparator, which may be constructed for a single operational amplifier, is integrated in the controller of the charging circuit, and the preset output voltage reduction amount, the preset operating frequency reduction amount, the preset output voltage increase amount, and the preset operating frequency increase amount may be prestored, 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 adjustment amount and the preset operating frequency adjustment amount may be directly invoked to control the operation of the PFC circuit and the LLC circuit, respectively. Wherein, predetermine output voltage regulating variable and predetermine operating frequency regulating variable and can set up to a great value to make PFC circuit and LLC circuit can keep better cooling efficiency throughout, and so set up still to be favorable to reducing design cost.
And 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 the control signals for controlling the PFC circuit and the LLC circuit to operate according to the determined output voltage and the operating frequency adjustment amount, so as to respectively control the PFC circuit to adjust the output voltage thereof by a voltage value corresponding to the output voltage adjustment amount, and control the LLC circuit to adjust the operating frequency thereof by a frequency corresponding to the operating frequency adjustment amount. Therefore, when the PFC/LLC circuit is over-temperature seriously, the PFC/LLC circuit can realize rapid cooling by determining a larger output voltage/working frequency regulating quantity, and when the PFC/LLC circuit is not over-temperature seriously, the PFC/LLC circuit can realize fine cooling 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 is favorably further improved, and the stability of the temperature range of full-power output of the charging circuit is also favorably 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 working frequency adjustment amount of the resonant circuit according to the comparison result includes:
when the comparison result shows that the working temperature of the power factor correction circuit is greater than a first preset temperature threshold and the working temperature of the resonant circuit is less than a second preset temperature threshold, under the condition that the total output power of the charging circuit is kept unchanged, the output voltage reduction amount of the power factor correction circuit is determined according to the comparison result and a first preset formula, and the working frequency reduction amount of the resonant circuit is determined according to the comparison result and a second preset formula;
and when the comparison result shows that the working temperature of the power factor correction circuit is smaller than a first preset temperature threshold and the working temperature of the resonant circuit is larger than a second preset temperature threshold, under the condition that the total output power of the charging circuit is not changed, determining the output voltage adjustment amount of the power factor correction circuit according to the comparison result and a third preset formula, and determining the working frequency adjustment 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 less 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 adjustment amount is the output voltage reduction amount, and the determined working frequency adjustment amount is the working frequency reduction amount; and when the working temperature of the PFC circuit is determined to be normal and the working temperature of the LLC circuit is determined to be overhigh, the determined output voltage adjustment amount is the output voltage adjustment amount, and the determined working frequency adjustment amount is the working frequency adjustment amount. The controller of the charging circuit can call corresponding preset voltage/frequency parameters and preset constant parameters according to the 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 can run a software algorithm or a program for calculating the called preset voltage/frequency parameters and the called preset constant parameters according to corresponding preset formulas so as to calculate the output voltage increase/decrease amount and the working frequency increase/decrease amount. Therefore, the dynamic balance of the temperatures of the PFC circuit and the LLC circuit can be realized, and the working temperature range of full power output of the charging circuit and the service life of the charging circuit can be favorably improved.
Referring to fig. 1 to 7, in an embodiment of the present invention, the first predetermined formula is the same as the third predetermined formula;
the first preset formula is as follows: Δ Vbus-a 1 Tp2-a2 Tp1, wherein 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 greater than a first preset temperature threshold value and the working temperature of the resonant circuit is less than a second preset temperature threshold value, and Tp1 is assigned as a first preset constant parameter, TP2 is assigned as a second preset constant parameter, wherein delta Vbus is less than or equal to zero, and delta Vbus is the working voltage reduction amount;
and 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 adjustment amount.
In this embodiment, a1, a2, Tp1 and Tp2 can be obtained by multiple preliminary experiments, which is not limited herein. The controller of the charging circuit can be pre-stored with a plurality of preset constant parameters, so that when the output voltage is determined to be adjusted in a low amount or an high amount, corresponding preset constant parameters can be selected from the plurality of preset constant parameters and assigned to Tp1 according to a comparison result of a difference value between the working temperature of the PFC circuit and the first preset temperature threshold, and corresponding preset constant parameters can be selected from the plurality of preset constant parameters and assigned to Tp2 according to a comparison result of a difference value between the working temperature of the LLC circuit and the second preset temperature threshold. It is to be noted that in the present embodiment, the values of Tp1 and Tp2 are both assigned when the output voltage adjustment amount is determined, as opposed to the values of Tp1 and Tp2 when the output voltage adjustment amount is determined. It should be further noted that, a1, a2, Tp1 and Tp2, 4 parameters may be one or more combinations of positive numbers, negative numbers or 0, respectively, which is not limited herein, but the 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 the output voltage is determined to be turned down, that is, the value of Δ Vbus is less than or equal to 0; when determining the output voltage adjustment amount, it is satisfied that the result of multiplication of a1 with Tp1 is greater than or equal to the result of multiplication of a2 × Tp2, that is, when the value of Δ Vbus is greater than or equal to 0. It is understood that, in other alternative embodiments, the first preset formula and the third preset formula may also be different formulas, so as to achieve more precise output voltage regulation 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 logics of TPI and TP2 are set to be opposite when the first preset formula and the third preset formula are calculated, so that the delta Vbus has a plurality of adjusting gears, multi-gear cooling protection of the PFC circuit can be achieved, 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 can be reduced.
Referring to fig. 1 to 7, in an embodiment of the present invention, the second predetermined formula is the same as the fourth predetermined formula;
the second preset formula is as follows: Δ fs is b1 Tp2-b2 Tp1, wherein 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 greater than a first preset temperature threshold and the working temperature of the resonant circuit is less than a second preset temperature threshold, and Tp1 is assigned as a first preset constant parameter, TP2 is assigned as a second preset constant parameter, wherein Δ fs is the output voltage reduction amount, and Δ fs is less 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, Tp1 is assigned as a second preset constant parameter, Tp2 is assigned as a first preset constant parameter, Δ fs is an output voltage adjustment amount, and Δ fs is larger than or equal to zero.
In this embodiment, b1 and b2 may be obtained by multiple preliminary experiments, and are not limited herein. The controller of the charging circuit can also select corresponding preset constant parameters from the plurality of preset constant parameters and assign the preset constant parameters to Tp1 according to the comparison result of the difference value between the working temperature of the characterization PFC circuit and the first preset temperature threshold value when the working frequency is determined to be adjusted to be decreased or increased, and select corresponding preset constant parameters from the plurality of preset constant parameters and assign the preset constant parameters to Tp2 according to the comparison result of the difference value between the working temperature of the characterization LLC circuit and the second preset temperature threshold value. It is to be noted that in the present embodiment, the assignment of both Tp1 and Tp2 when determining the operating frequency adjustment amount is opposite to the assignment of both Tp1 and Tp2 when determining the operating frequency adjustment amount. b1 and b2 may be respectively one or more combinations of positive numbers, negative numbers or 0, and are not limited herein, but specific values of b1, b2, Tp1 and Tp2 are required to satisfy that the product result of b1 and Tp1 is less than or equal to the product result of b2 × Tp2 when the operating frequency is determined to be reduced, that is, the value of Δ fs is less than or equal to 0; when the operating frequency adjustment amount is determined, it is satisfied that the result of multiplication of b1 with Tp1 is greater than or equal to the result of multiplication of b2 by Tp2, that is, the value of Δ fs is greater than or equal to 0. It is understood that, in other alternative embodiments, the second preset formula and the fourth preset formula may also be different formulas, so as to achieve more accurate operation frequency adjustment 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 logics of TPI and TP2 are set to be opposite when the second preset formula and the fourth preset formula are calculated, so that the delta fs1 has the same number of adjusting gears as the delta Vbus1, multi-gear cooling protection of the LLC circuit can be achieved, the accuracy of temperature protection of the LLC circuit is improved, the probability of over-temperature damage of the 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 predetermined constant parameter is one of 0 and 1, and the second predetermined constant parameter is the other of 0 and 1.
In this embodiment, there are two assignment schemes, the first scheme is: when the first preset constant parameter is assigned to be 1, and the second preset constant parameter is assigned to be 0; and the second method comprises the following steps: when the first preset constant parameter is assigned to 0, and the second preset constant parameter is assigned to 1. When the first scheme is adopted, when the output voltage adjustment amount and the working frequency adjustment amount are determined, and a2 and b2 are not negative numbers, the Δ Vbus1 and the Δ fs1 can be ensured to be less than or equal to 0; when the output voltage adjustment amount and the working frequency adjustment amount are determined, and a1 and b1 are not negative numbers, the Δ Vbus2 and Δ fs2 can be ensured to be larger than 0, namely a1, a2, b1 and b2 can be set to be non-complex numbers, and 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 power factor correction 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 240, correspondingly adjusting the voltage value of the output voltage of the power factor correction circuit and the working frequency of the resonance circuit to reduce the total output power of the charging circuit when the comparison result shows that the working temperature of the power factor correction circuit is greater than a first preset temperature threshold and the working temperature of the resonance circuit is greater than a second preset temperature threshold.
In this embodiment, when the comparison result indicates that the operating temperature of the PFC circuit is greater than the first preset temperature threshold and the operating temperature of the LLC circuit 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, but the operating temperature of the PFC circuit or the LLC circuit cannot be transferred to the other circuit to be borne at this time. In view of this problem, the controller of the charging circuit may control the charging circuit to perform derating operation when determining that the operating temperatures of the PFC circuit and the LLC circuit are both too high, so that the rated output power of the charging circuit at this time is reduced, and the operating temperatures of both the PFC circuit and the LLC circuit are reduced. 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 to be understood that step 240 need only be after step 210. Therefore, the probability of the over-temperature damage of the first power tube and the second power tube is reduced to the minimum, and the service life and the charging stability of the charging circuit are remarkably improved.
The invention also provides a controller of the charging circuit, which can be used in the charging circuit.
The charging circuit includes a power factor correction circuit for power factor correcting an input power supply signal and a resonance circuit for resonance converting the power factor corrected power supply signal, and the controller of the charging circuit includes:
a memory 101;
a processor 102; and
a control program of the charging circuit stored on the memory 101 and executable on the processor, the processor 102 implementing 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 may be a non-volatile memory (e.g., a magnetic disk memory), and the memory 101 may optionally be a storage device independent from the control device; the processor 102 may be a CPU. The memory 101 and the processor 102 are connected by a communication bus 103, and the communication bus 103 may be a UART bus or an I2C bus. It is understood 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 also 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 transformation on the power factor corrected power supply signal; and the number of the first and second groups,
as described above, the controller of the charging circuit is connected to the power factor correction circuit 210 and the resonant circuit 220, respectively.
In this embodiment, the PFC circuit 210 may be constructed by using discrete electronic devices such as an inductance element, a switching device, and a diode; the switching device is the first power transistor described in this application, and may be one or a combination of more than one of an IGBT or a MOSFET. The PFC circuit 210 may include a rectifying circuit and a voltage converting circuit, and the first power transistor may be disposed in the voltage converting circuit; an input end of the PFC circuit 210, i.e. the U, V, W three-phase input end in fig. 6, may be connected to a power signal in the form of a three-phase ac voltage output by an ac power source such as a mains grid, and output the power signal to a rectification circuit for rectification and transformation, so as to rectify the ac voltage into a dc voltage and output the dc voltage to a voltage conversion circuit therein for corresponding step-up or step-down transformation and output the dc voltage.
The LLC circuit 220 can be implemented by discrete electronic devices such as switching devices, transformers, diodes, resistors, and capacitors; the switching device is the second power transistor described in this application, and may also 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 the 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, a modulation circuit such as a chopper circuit may be further disposed behind the LLC circuit 220, so as to output the voltage output by the LLC circuit 220 as the output voltage Vo of the charging circuit after modulation processing such as chopping. In the embodiment shown in fig. 6, Vbus is the bus voltage, which is also the output voltage of the PFC circuit 210; the number of the LLC circuits 220 is two, the two LLC circuits 220 are arranged in series, wherein the positive input end of the first LLC circuit 220 is connected to a positive voltage bus (in fig. 6, "+"), the negative input end of the second LLC circuit 220 is connected to a negative voltage bus (in fig. 6, "-"), and there are two bus capacitors (C1, C2) connected in series between the positive and negative voltage buses, and the common point of the two bus capacitors is connected to the negative input end of the first LLC circuit 220 and the positive input end of the second LLC circuit 220, respectively; the bus capacitors (C1, C2) are used for providing pure dc voltage for the two LLC circuits 220. In the embodiment shown in fig. 6, the output voltage of one of the LLC circuits 220 is Vo1, the output voltage of the other LLC circuit 220 is Vo2, and Vo1 and Vo2 can be output to the battery in the charging load through the output serial/parallel relay. In another alternative embodiment, the two LLC circuits 220 may also be arranged in parallel.
The charging circuit comprises a controller of the charging circuit; the detailed structure of the controller of the charging circuit can refer to the above embodiments, and is not described herein again; it can be understood that, because the controller of the charging circuit is used in the charging circuit, the embodiment of the charging circuit includes all technical solutions of all embodiments of the controller of the charging circuit, and the achieved technical effects are also completely the same, and are not described herein again. The controller of the charging circuit is used for controlling 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 comprises: and the resonance controller is in communication connection with the resonance circuit and the controller of the charging circuit respectively, and is used for controlling the resonance circuit to work.
For simplicity of explanation, the PFC controller 211 and the LLC controller 221 are used as the power factor correction controller and the resonance electric controller in this specification instead of the expression. 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 also 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 a temperature detection signal output by the temperature detection circuit in the PFC circuit 210 through the PFC controller 211, and may feedback the determined output voltage increase amount or the determined output voltage decrease 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 that the controller of the charging circuit is integrated 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 the temperature detection signal output by the temperature detection circuit in the LLC circuit 220 through the LLC controller 221, and may feedback and output the determined output voltage adjustment amount or the determined output voltage reduction amount 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 that the controller of the charging circuit is integrated with the PFC controller 211.
In the embodiment shown in fig. 7, the controller of the charging circuit may be integrated with the PFC controller 211 or the LLC controller 221, and the controller of the charging circuit and the LLC controller 221 are explained 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, and Tref2 may be a second preset temperature threshold; the comparator A1 has its non-inverting input connected to Temp1 and its inverting input connected to Tref1 for comparing Temp1 with Tref1 and outputting a high signal when Temp1 is greater than Tref1 and a low signal when Temp1 is less than Tref 1. The comparator A2 has its non-inverting input connected to Temp2 and its inverting input connected to Tref2 for comparing Temp2 with Tref2 and outputting a high signal when Temp2 is greater than Tref2 and a low signal when Temp2 is less than Tref 2. The PFC controller 211 may communicate the output signal of the comparator a1 to the LLC controller 221, so that the LLC controller 221 may determine the temperature states of the PFC circuit and the LLC circuit according to the output signals of the comparator a1 and the comparator a2, and determine the corresponding output voltage down/up and the operating frequency down/up. The LLC controller 221 may adjust the determined output voltage to a lower/higher amount and then return 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 increase/decrease its output voltage value, and may directly control the LLC driving circuit 222 to drive the LLC circuit to correspondingly increase/decrease its operating frequency. Since the working principle and logic of the charging circuit when the controller and the PFC controller 211 are integrally configured can refer to the above embodiments, they are not described herein again. 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 include the PFC controller 211 and the LLC controller 221, i.e. when both the PFC controller 211 and the LLC controller 221 are integrated in the controller of the charging circuit. In yet another alternative embodiment, the charging circuit includes the PFC controller 211 and the LLC controller 221, that is, in this case, the controller of the charging circuit, the PFC controller 211 and the LLC controller 221 are independently arranged, and two of the three are in communication connection with each other. In practical generation application, the charging circuit usually adopts a design concept that the PFC controller 211 and the LLC controller 221 are independently arranged, but the PFC controller 211 and the LLC controller 221 are usually designed by different design teams, so as to facilitate communication with controllers designed by other teams and reduce program design cost, the existing PFC controller 211 and LLC controller 221 can only judge whether their corresponding PFC or LLC circuits are over-temperature, and when the over-temperature is identified, can only control their corresponding PFC210 or LLC circuit 220 to perform derating operation, and communicate with another controller to trigger another controller to control its corresponding circuit to perform derating operation. The technical scheme of the application overcomes the design defects 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 full-power output temperature range of the charging circuit is greatly improved, and the service life of the charging circuit is greatly prolonged.
The invention further provides a charging pile body, which comprises a charging gun and a charging circuit, the specific structure of the charging circuit refers to the above embodiments, and the charging pile body adopts all the technical schemes of all the embodiments, so that the charging pile body at least has all the beneficial effects brought by the technical schemes of the embodiments, and further description is omitted. Wherein, 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 such as an electric automobile.
The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (11)

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, the control method of the charging circuit comprising the steps of:
acquiring the working temperature of a power factor correction circuit and the working temperature of a resonance circuit;
and correspondingly adjusting the voltage value of the output voltage of the power factor correction circuit according to the acquired working temperature of the power factor correction circuit and the working temperature of the resonance circuit, and correspondingly adjusting the working frequency of the resonance circuit.
2. The method for controlling the charging circuit according to claim 1, wherein the step of correspondingly adjusting the voltage value of the output voltage of the power factor correction circuit according to the acquired operating temperature of the power factor correction circuit and the operating temperature of the resonant circuit and correspondingly adjusting the operating frequency of the resonant circuit comprises the steps of:
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 resonance 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 amount, and correspondingly adjusting the working frequency of the resonant circuit according to the determined working frequency adjustment amount.
3. The method for controlling a charging circuit according to claim 2, wherein 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 comprises:
when the comparison result shows that the working temperature of the power factor correction circuit is greater than a first preset temperature threshold and the working temperature of the resonant circuit is less than a second preset temperature threshold, under the condition that the total output power of the charging circuit is kept unchanged, the output voltage reduction amount of the power factor correction circuit is determined according to the comparison result and a first preset formula, and the working frequency reduction amount of the resonant circuit is determined according to the comparison result and a second preset formula;
and when the comparison result shows that the working temperature of the power factor correction circuit is smaller than a first preset temperature threshold and the working temperature of the resonant circuit is larger than a second preset temperature threshold, under the condition that the total output power of the charging circuit is not changed, determining the output voltage adjustment amount of the power factor correction circuit according to the comparison result and a third preset formula, and determining the working frequency adjustment amount of the resonant circuit according to the comparison result and a fourth preset formula.
4. The control method of the charging circuit according to claim 3, wherein the first preset formula is the same as a third preset formula;
the first preset formula is as follows: Δ Vbus-a 1 Tp2-a2 Tp1, wherein 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 greater than a first preset temperature threshold value and the working temperature of the resonant circuit is less than a second preset temperature threshold value and Tp1 is assigned as a first preset constant parameter, assigning TP2 as a second preset constant parameter, wherein the delta Vbus is less than or equal to zero and is the working voltage reduction amount;
and when the comparison result is that the working temperature of the power factor correction circuit is less than a first preset temperature threshold value and the working temperature of the resonant circuit is greater than a second preset temperature threshold value, assigning Tp1 as a second preset constant parameter, assigning Tp2 as the first preset constant parameter, wherein the delta Vbus is greater than or equal to zero, and the delta Vbus is the working voltage adjustment amount.
5. The control method of the charging circuit according to claim 3, wherein the second preset formula is the same as a fourth preset formula;
the second preset formula is as follows: Δ fs is b1 Tp2-b2 Tp1, wherein 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 greater than a first preset temperature threshold and the working temperature of the resonant circuit is less than a second preset temperature threshold, assigning Tp1 as a first preset constant parameter, and assigning TP2 as a second preset constant parameter, wherein Δ fs is the output voltage reduction amount, and is less 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 assigning Tp2 as a first preset constant parameter, wherein Δ fs is an output voltage adjustment amount, and Δ fs is larger than or equal to zero.
6. The control method of the charging circuit according to claim 4 or 5, wherein the first preset constant parameter is one of both 0 and 1, and the second preset constant parameter is the other of both 0 and 1.
7. The method for controlling the charging circuit according to claim 2, wherein the steps of comparing the acquired operating temperature of the power factor correction circuit with a first preset temperature threshold and comparing the acquired operating temperature of the resonant circuit with a second preset temperature threshold further comprise:
and when the comparison result shows that the working temperature of the power factor correction circuit is greater than a first preset temperature threshold and the working temperature of the resonance circuit is greater than a 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 resonance circuit so as to reduce the total output power of the charging circuit.
8. A controller for a charging circuit including a power factor correction circuit for power factor correcting an input power signal and a resonant circuit for resonant conversion of the power factor corrected power signal, the controller comprising:
a memory;
a processor; and
a control program for a charging circuit stored on a memory and executable on a processor, the processor implementing a control method for a charging circuit as claimed in any one of claims 1 to 7 when executing the control program for the charging circuit.
9. A charging circuit, comprising:
the power factor correction circuit is used for carrying out power factor correction on an input power supply signal;
the resonance circuit is used for performing resonance transformation on the power supply signal subjected to power factor correction; and the number of the first and second groups,
the controller of the charging circuit of claim 8, the controller of the charging circuit being connected to the power factor correction circuit and the resonant circuit, respectively.
10. The charging circuit of claim 9, further comprising: 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 comprises: and the resonance controller is in communication connection with the resonance circuit and the controller of the charging circuit respectively, and is used for controlling the resonance circuit to work.
11. A charging pole, characterized in that it comprises a charging gun and a charging circuit according to any one of claims 9-10;
and the power supply input end of the charging gun is connected with the power supply output end of the charging circuit.
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