WO2022165815A1 - Ripple current control method and system, and device - Google Patents

Ripple current control method and system, and device Download PDF

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Publication number
WO2022165815A1
WO2022165815A1 PCT/CN2021/075880 CN2021075880W WO2022165815A1 WO 2022165815 A1 WO2022165815 A1 WO 2022165815A1 CN 2021075880 W CN2021075880 W CN 2021075880W WO 2022165815 A1 WO2022165815 A1 WO 2022165815A1
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Prior art keywords
ripple current
circuit
current
output
value
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PCT/CN2021/075880
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French (fr)
Chinese (zh)
Inventor
蒋芳林
赵德琦
吴壬华
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深圳欣锐科技股份有限公司
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Priority to CN202180003299.4A priority Critical patent/CN114051688B/en
Priority to PCT/CN2021/075880 priority patent/WO2022165815A1/en
Publication of WO2022165815A1 publication Critical patent/WO2022165815A1/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/14—Arrangements for reducing ripples from dc input or output
    • 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
    • B60L53/20—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 characterised by converters located in the vehicle
    • B60L53/22—Constructional details or arrangements of charging converters specially adapted for charging 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
    • H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
    • 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
    • H02M1/4233—Arrangements for improving power factor of AC input using a bridge converter comprising active switches
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
    • H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Definitions

  • the present application relates to the field of circuit technology, and in particular, to a ripple current control method, system and device.
  • the car charger is a device for charging the car power battery. At present, most of the car chargers use switching power supplies.
  • the input voltage of the switching power supply is AC mains, the frequency is usually 50Hz, and the output is high-voltage DC.
  • the power factor correction (Power Factor Correction, PFC) + bidirectional resonant converter (LLC resonant converter, CLLC) circuit inside the switching power supply can complete the conversion from AC mains to high-voltage DC, so that the switching power supply can charge the vehicle power battery with constant current.
  • PFC Power Factor Correction
  • CLLC bidirectional resonant converter
  • the high-voltage DC power output by the PFC+CLLC circuit after rectifying the AC mains usually contains AC low-frequency ripple, and the AC low-frequency ripple superimposed on the DC quantity is called ripple current.
  • Ripple current will affect the life of the vehicle power battery, thereby affecting the normal use of the vehicle.
  • the purpose of this application is to provide a ripple current control method, which can adjust the output voltage of the PFC circuit, change the operating frequency of the CLLC resonant circuit, keep the CLLC resonant circuit away from the resonant frequency, and avoid loop oscillation, thereby reducing the ripple current.
  • the present application provides a ripple current control method, the method comprising: collecting an output current, wherein the output current is an output current of a CLLC resonant circuit, the CLLC resonant circuit is connected to a PFC circuit, and the output current of the PFC circuit is is the input current of the above-mentioned CLLC resonant circuit; determine the value of the ripple current carried by the above-mentioned output current, the above-mentioned ripple current will cause the change of the amplitude of the output current and affect the stability of the output current; according to the value of the ripple current value, through pulse width modulation, to adjust the output voltage of the PFC circuit.
  • the value of the ripple current in the output of the circuit is reduced by adjusting the output voltage of the PFC circuit, so as to prevent the ripple current from having a great influence on the vehicle power battery.
  • determining the value of the ripple current carried by the output current includes: determining the peak-to-peak value of the ripple current carried by the output current, where the peak-to-peak value is the maximum value and the minimum value of the output current difference in value.
  • the method further includes: judging whether the magnitude of the ripple current exceeds the threshold value of the ripple current; if the judgment is yes, according to the ripple current , adjust the output voltage of the PFC circuit; if the judgment is no, keep the output voltage of the PFC circuit unchanged.
  • the output voltage of the PFC circuit is adjusted from high to low through pulse width modulation until the value of the ripple current is less than the threshold value, or; through pulse width modulation, the output voltage of the PFC circuit is adjusted from low to low The output voltage of the PFC circuit is adjusted high until the value of the ripple current is less than the threshold.
  • the method further includes: after adjusting the output voltage of the PFC circuit from high to low through pulse width modulation; or, after adjusting the PFC circuit from low to high through pulse width modulation After the output voltage is , the voltage of the PFC circuit corresponding to the minimum value of the ripple current is taken as the output voltage of the PFC circuit.
  • the present application provides a ripple current control system, characterized in that the ripple current control system includes: a sampling module, a determination module, and a control module: the sampling module is used to collect output current, wherein the output current is The output current of the CLLC resonant circuit, the CLLC resonant circuit is connected to the PFC circuit, and the output current of the above-mentioned PFC circuit is the input current of the above-mentioned CLLC resonant circuit; the above-mentioned determination module is used to determine the magnitude of the ripple current carried by the output current; the above-mentioned control module uses According to the value of the ripple current, the output voltage of the PFC circuit is adjusted by pulse width modulation.
  • the above-mentioned ripple current control system further includes a judgment module: the judgment module is used to judge whether the magnitude of the ripple current exceeds the threshold value of the ripple current; if the judgment is yes, according to the According to the value of the ripple current, the output voltage of the PFC circuit is adjusted; if the judgment is no, the output voltage of the PFC circuit is maintained unchanged.
  • an embodiment of the present application provides a ripple current control circuit, where the ripple current control circuit performs any possible implementation method of the first aspect.
  • the present application provides a charging device, the charging device includes a ripple current control circuit, and the ripple current control circuit performs any possible implementation method of the first aspect.
  • an embodiment of the present application provides a vehicle, where the vehicle includes a charging device, and the charging device performs any possible implementation method of the first aspect.
  • the application collects information such as the output current of the circuit, and then judges whether the output voltage of the PFC circuit needs to be adjusted through the peak-to-peak value and threshold value of the ripple current, and can adjust the output voltage through the control module, thereby eliminating the output current of the circuit.
  • the ripple current stabilizes the DC output of the circuit, thus solving the problem that the ripple current affects the life of the vehicle power battery.
  • FIG. 2 is a schematic diagram of a PFC+CLLC circuit provided by the present embodiment
  • FIG. 3 is a schematic diagram of a ripple current control system provided by this embodiment
  • FIG. 4 is a schematic structural diagram of a ripple current control system provided in this embodiment.
  • FIG. 5 is a schematic diagram of the connection between the ripple current control system and the circuit provided in this embodiment
  • FIG. 6 is a schematic flowchart of the ripple current control method provided in this embodiment.
  • FIG. 7 is a schematic structural diagram of the charging device provided in this embodiment.
  • the car charger is a device for charging the car power battery. At present, most of the car chargers use switching power supplies.
  • the input voltage of the switching power supply is AC mains, the frequency is usually 50Hz, and the output is high-voltage DC.
  • the PFC+CLLC circuit inside the switching power supply can complete the transformation from AC mains to high-voltage DC, so that the switching power supply can charge the vehicle power battery with constant current.
  • FIG. 1 is a schematic structural diagram of a PFC+CLLC circuit 100 .
  • the PFC+CLLC circuit 100 includes a PFC circuit 101 , a large-capacity capacitor C2 , a CLLC resonance circuit 102 and an output filter circuit 103 .
  • the input of the PFC circuit 101 is AC
  • the output of the output filter circuit 103 is DC.
  • the live wire of the AC input terminal of the PFC+CLLC circuit 100 is connected to the first terminal 1011 of the PFC circuit 101
  • the neutral wire of the AC input terminal of the PFC+CLLC circuit 100 is connected to the second terminal 1012 of the PFC circuit 101 .
  • the third terminal 1013 of the PFC circuit 101 is connected to the anode of the bulk capacitor C2 and the first terminal 1021 of the CLLC resonant circuit 102 .
  • the fourth terminal 1014 of the PFC circuit 101 is connected to the negative terminal of the bulk capacitor C2 and the second terminal 1022 of the CLLC resonant circuit 102 .
  • the third terminal 1023 of the CLLC resonance circuit 102 is connected to the first terminal 1031 of the output filter circuit 103
  • the fourth terminal 1024 of the CLLC resonance circuit 102 is connected to the second terminal 1032 of the output filter circuit 103 .
  • the positive output of the PFC+CLLC circuit 100 is connected to the third terminal 1033 of the output filter circuit 103
  • the negative output of the PFC+CLLC circuit 100 is connected to the fourth terminal 1034 of the output filter circuit 103 .
  • the PFC circuit 101 includes diodes D1 and D2, an inductor L1, a capacitor C1 and an N-channel enhancement type metal oxide semiconductor field effect transistor (N-Metal-Oxide-Semiconductor Field-Effect Transistor, N-MOSFET, hereinafter referred to as MOS tube) Q1, Q2, Q3, Q4.
  • N-MOSFET N-Metal-Oxide-Semiconductor Field-Effect Transistor
  • the live wire of the AC input terminal of the PFC+CLLC circuit 100 is connected to the anode of the diode D1, the first terminal e01 of the inductor L1 and the cathode of the diode D2, and the cathode of the diode D1 is connected to the drain (Drain, D pole) of the MOS transistor Q1, the capacitor The first end e03 of C1 and the D pole of the MOS transistor Q3.
  • the second end e02 of the inductor L1 is connected to the source (Source, S pole) of the MOS transistor Q1 and the D pole of the MOS transistor Q2.
  • the S pole of the MOS transistor Q2 is connected to the anode of the diode D2, the second end e04 of the capacitor C1 and the S pole of the MOS transistor Q4.
  • the neutral line of the AC input terminal of the PFC+CLLC circuit 100 is connected to the D pole of the MOS transistor Q4 and the S pole of the MOS transistor Q3.
  • the positive pole of the large-capacity capacitor C2 is connected to the D pole of the MOS transistor Q3 of the PFC circuit 101, and the negative pole of the large-capacity capacitor C2 is connected to the S pole of the MOS transistor Q4.
  • the CLLC resonant circuit 102 includes MOS transistors Q5 , Q6 , Q7 , Q8 , Q9 , Q10 , Q11 , and Q12 , an inductor L2 , capacitors C3 and C4 , a transformer T1 , and a transformer T2 .
  • the positive pole of the large-capacity capacitor C2 is connected to the D pole of the MOS transistor Q5 and the D pole of the MOS transistor Q7, and the negative pole of the large-capacity capacitor C2 is connected to the S pole of the MOS transistor Q6 and the S pole of the MOS transistor Q8 and then connected to the primary side ground.
  • the gates (Gate, G poles) of the MOS transistors Q5, Q6, Q7, and Q8 are connected to the CLLC driving circuit, and the CLLC driving circuit is not described in detail in this embodiment.
  • the S pole of the MOS transistor Q5 is connected to the D pole of the MOS transistor Q6 and then to the first end e05 of the inductor L2.
  • the S pole of the MOS transistor Q7 is connected to the D pole of the MOS transistor Q8 and then to the first end e07 of the capacitor C3.
  • the first end of the transformer T1 and the primary coil of the transformer T2 are connected in series to the second end e06 of the inductor L2, and the second end after the series connection is connected to the second end e08 of the capacitor C3.
  • the transformer T1 is connected in parallel with the secondary coil of the transformer T2, and the first end is connected to the S pole of the MOS transistor Q9 and the D pole of the MOS transistor Q10. D pole of tube Q12.
  • the D pole of the MOS transistor Q9 is connected to the D pole of the MOS transistor Q11, and the S pole of the MOS transistor Q10 is connected to the S pole of the MOS transistor Q12 and then connected to the secondary side ground.
  • the output filter circuit 103 includes capacitors C5, C7, C8, an inductor L3, a large-capacity capacitor C6, a common-mode inductor L4, a casing J1, and a fuse F1.
  • the first terminal e09 of the capacitor C5 and the first terminal e11 of the inductor L3 are connected to the D pole of the MOS transistor Q11 in the CLLC resonant circuit 102, and the second terminal e12 of the inductor L3 is connected to the positive pole of the bulk capacitor C6 and the common mode inductor
  • the first end e13 of the L4 and the second end e10 of the capacitor C5 are connected to the negative electrode of the bulk capacitor C6 and the second end e14 of the common mode inductor L4 and then connected to the secondary side ground.
  • the capacitor C7 and the capacitor C8 are connected in series with the third terminal e15 and the fourth terminal e16 of the common mode inductor L4, wherein the capacitor C7 and the capacitor C8 are connected to the casing J1 in the middle, and the third terminal e15 of the common mode inductor L4 is connected to the fuse F1.
  • the positive pole of the DC output of the PFC+CLLC circuit 100 is connected to the fourth terminal e16 of the common mode inductor L4 to the negative pole of the DC output of the PFC+CLLC circuit 100 .
  • the PFC circuit 101 corrects the power factor by adjusting the phase of the input current and the input voltage, and the PFC circuit 101 can also convert the input AC voltage into a high-voltage DC voltage;
  • the large-capacity capacitor C2 is the energy storage capacitor of the PFC circuit 101;
  • the CLLC resonant circuit 102 is an isolated DC-DC power isolation conversion circuit, using the LC resonance characteristic, so that when the power supply is a DC power supply, the current in the circuit changes according to a sinusoidal law, and the current has a zero-crossing situation at this time. When the device is turned on or off, the resulting loss is zero, that is, the soft switching function of the CLLC resonant circuit 102 is realized.
  • the PFC circuit 101 can convert the input AC voltage into a high-voltage DC voltage, but the high-voltage DC output will inevitably superimpose some AC components, that is, ripple current, and the DC-DC conversion is performed in the CLLC resonant circuit 102 , the ripple current will also be superimposed on the output current of the CLLC resonant circuit 102 , and at the same time, the CLLC resonant circuit 102 will also generate a ripple current.
  • the ripple current or voltage refers to the high-order harmonic components in the current, which will bring about changes in the current or voltage amplitude, which may lead to breakdown.
  • LC filter circuit LC filter circuit or RC filter circuit
  • LC filter circuit due to volume limitations, LC The size of the filter inductor used in the filter circuit cannot be as large as possible, so the ripple current cannot be reduced as much as possible.
  • the filter capacitor of the RC filter circuit is increased to a certain level in specific use, its effect on reducing the ripple current is significantly reduced, and the cost and application space requirements are increased at the same time.
  • the other is by adjusting the PI parameters of the feedback loop.
  • the control deviation is formed according to the given value and the actual output value, and the proportional (P) and integral (I) of the deviation are linearly combined to form a control amount to control the controlled object.
  • the larger the proportional action the faster the adjustment speed, but the stability of the system will decrease.
  • due to the wide output voltage/current range and wide operating frequency range of the CLLC resonant circuit 102 its different output voltage/current operating conditions may be above the CLLC resonant frequency, or below the CLLC resonant frequency, or work at the resonant frequency. When the operating frequency is near the resonant frequency point, the CLLC resonant circuit 102 is very easy to oscillate, and the output ripple current cannot be adjusted by the PI parameter.
  • an embodiment of the present application provides a ripple current control system 200 , which adjusts the output voltage of the PFC circuit 101 to adjust the CLLC operating frequency, so that the CLLC resonant circuit 102 Move away from the resonant frequency to avoid loop oscillation, thereby reducing ripple current.
  • a ripple current control system 200 provided by an embodiment of the present application, as shown in FIG. 3 , the control system is connected to the fifth end 2001 of the output filter circuit 103 and the fifth end 2002 of the PFC circuit 101 .
  • the ripple current control system 200 can adjust the output voltage of the PFC circuit 101 according to the output ripple current of the CLLC resonant circuit 102, thereby controlling the operating frequency of the CLLC resonant circuit 102 to avoid the oscillation generated by the CLLC resonant circuit 102 operating at the resonant frequency point. .
  • the application does not limit the division of the functional units in the ripple current control system 200, and each module in the ripple current control system 200 can be added, reduced or combined as required. It may be a hardware module, or a part of a software module and a part of a hardware module, which is not limited in this application.
  • a division of functional modules is exemplarily provided: the ripple current control system 200 is composed of a sampling module 210 , a calculation module 220 , a judgment module 230 and a control module 240 . The function of each part is described below.
  • the sampling module 210 is used to collect the output current I CLLC of the CLLC resonant circuit 102 and the output voltage V PFC of the PFC circuit 101 .
  • the above-mentioned output current I CLLC includes a ripple current, and the ripple current is a high-order harmonic component carried by the output current I CLLC .
  • the calculation module 220 is configured to obtain the data of the output current I CLLC and calculate the difference between the maximum value and the minimum value of the output current I CLLC , and the difference is the peak-to-peak value of the ripple current I pk .
  • the calculation module 220 sends the calculated peak-to-peak value I pk of the ripple current to the judgment module 230 .
  • the judgment module 230 is used to judge whether the output voltage V PFC needs to be adjusted by comparing the ripple current threshold I S with the actual ripple current peak-to-peak value I pk .
  • the control module 240 completes the control of the output voltage VPFC of the PFC circuit 101 until the peak-to-peak value of the ripple current Ipk reaches the ripple current threshold IS ; if it is determined that no adjustment is required, the output voltage VPFC will remain unchanged.
  • the control module 240 is configured to receive the adjustment information sent by the determination module 230 and the output voltage V PFC information collected by the sampling module 210 and adjust the output voltage V PFC . Specifically, after receiving the adjustment information sent by the judgment module 230, the control module 240 adjusts the duty ratios of the MOS transistors Q1, Q2, Q3 and Q4 in the PFC circuit 101 to control the output voltage VPFC of the PFC circuit 101 until the ripple The current peak-to-peak value I pk reaches the ripple current threshold value IS .
  • FIG. 5 The connection relationship between the functional modules of the ripple current control system 200 and the PFC+CLLC circuit 100 is shown in FIG. 5 , the detailed description of the PFC+CLLC circuit 100 can refer to the description of FIG. Reference may be made to the description of FIG. 4 , which will not be repeated here.
  • the ripple current control system 200 can determine whether the output voltage V PFC of the PFC circuit 101 needs to be adjusted by collecting information such as the output current of the circuit, and then determining whether the output voltage V PFC of the PFC circuit 101 needs to be adjusted according to the peak-to-peak value and the threshold value of the ripple current, and can control
  • the module 240 adjusts the output voltage VPFC , thereby eliminating the ripple current in the output current of the circuit, so as to stabilize the output DC of the circuit, and solve the problem that the ripple current affects the life of the vehicle power battery.
  • the present application provides a ripple current control method, and the method includes the following steps:
  • the collection module 210 collects the output current I CLLC of the CLLC resonant circuit 102 , the output current I CLLC includes a ripple current, and the ripple current is a high-order harmonic component carried by the output current I CLLC .
  • the collection module 210 collects the current at the second end e12 of the inductor L3 , where the current is equivalent to the output current I CLLC of the CLLC resonant circuit 102 .
  • the peak-to-peak value I pk of the ripple current carried by the CLLC resonant circuit 102 is calculated from the output current I CLLC of the CLLC resonant circuit 102 .
  • the output current I CLLC should ideally be DC, but because the PFC circuit will also carry some AC components in the output DC when the AC is converted to DC, therefore, the peak-to-peak value I pk of the ripple current is calculated as the output current I CLLC The difference between the maximum value and the minimum value of .
  • the ripple current peak-to-peak value I pk calculated by the calculation module 220 is compared with the ripple current threshold value IS to determine whether the output voltage V PFC needs to be adjusted.
  • the ripple current threshold IS is a ripple current value that has little or negligible impact on the vehicle power battery, and the ripple current threshold IS can also be set by the user.
  • the ripple current threshold I S it is considered that the current circuit ripple current will not have a large impact on the circuit or the impact can be ignored, and it is only necessary to maintain the output voltage VPFC unchanged. Can.
  • step S310 will continue to be performed until the ripple current peaks.
  • the peak value I pk reaches the ripple current threshold value IS , the output voltage of the PFC circuit 101 under this working condition is set, and the output voltage V PFC is kept unchanged.
  • Pulse width modulation is used to adjust the output voltage V PFC .
  • the voltage of the positive electrode of the large-capacity capacitor C2 is sampled, and the MOS transistors Q1, Q2, Q3, and Q4G are adjusted by the control module 240.
  • the voltage range of the PFC circuit 101 is adjusted from high to low or from low to high to adjust the output voltage V PFC of the PFC circuit 101 until the peak-to-peak value of the ripple current I pk
  • the ripple current threshold IS is reached.
  • the output voltage VPFC is set to the peak-to-peak value I pk of the ripple current during the adjustment process.
  • the minimum value corresponds to VPFC .
  • the inherent step can be 1 volt every 100 milliseconds, that is, 1V/100ms, and the voltage range of the PFC circuit 101 is 380V-415V. Therefore, first adjust VPFC from 415V down, while monitoring the peak-to-peak ripple current I pk , if the ripple current threshold IS is reached during the adjustment process, the adjustment will be stopped. If the PFC voltage has been adjusted to the lower limit of 380V and has not reached the ripple current threshold I S , continue to adjust from the lowest to the higher. During the adjustment process, monitor whether the peak-to-peak value I pk of the ripple current reaches the ripple current threshold I S , and stop adjusting if it is reached. . If the ripple current threshold IS is not reached after the adjustment from high to low or from low to high is completed, set the PFC voltage with the minimum value of the ripple current during the adjustment process.
  • the ripple current control method by collecting information such as the output current of the circuit, and then determining whether the output voltage V PFC of the PFC circuit 101 needs to be adjusted according to the peak-to-peak value and the threshold value of the ripple current, and can be adjusted by the control module 240 adjusts the output voltage VPFC , thereby eliminating the ripple current in the output current of the circuit, making the circuit output DC stable, and solving the problem that the ripple current affects the life of the vehicle power battery.
  • Equation 1 is the gain function G of the CLLC resonant circuit 102 .
  • V OUT is the output voltage of the CLLC resonant circuit 102
  • V PFC is the input voltage of the CLLC circuit 102 , that is, the output voltage of the PFC circuit 101 .
  • the frequency-dependent expression G(f) of the gain function G of the CLLC resonant circuit 102 may be as shown in Equation 2.
  • x is the ratio of the actual operating frequency f to the resonant frequency fr of the CLLC resonant circuit 102 under this operating condition.
  • the calculation method of the resonant frequency fr is shown in formula 4, wherein the resonant inductance L r is the L2 inductance value of the inductance of the CLLC resonant circuit 102 , and C r is the resonant capacitance.
  • k is the ratio of the excitation inductance L p to the resonant inductance L r , where the excitation inductance L p is the inductance value of the transformer T1 and the primary coil of the transformer T2 in series.
  • Equation 6 R ac is the resistance value of the load resistance.
  • the actual operating frequency f of the CLLC resonant circuit 102 is determined by the input voltage V PFC of the CLLC resonant circuit 102 , the inherent parameters of the CLLC resonant circuit 102 (such as L r , L p , C r , R ac ) and the CLLC resonant circuit 102
  • the output voltage V OUT is determined. Understandably, if the input voltage V PFC of the CLLC resonant circuit 102 is adjusted, the actual operating frequency f must change in order to achieve the required output voltage under the condition that the inherent parameters of the CLLC resonant circuit 102 remain unchanged.
  • the actual operating frequency f of the CLLC resonant circuit 102 is changed by adjusting the input voltage of the PFC circuit 101 and then the input voltage V PFC of the CLLC resonant circuit 102 , so that the CLLC resonant circuit 102 is far away from the resonant frequency under operating conditions.
  • the embodiment of the present application further provides a ripple current control circuit, and the ripple current control circuit can execute the methods described in steps S310 to S340.
  • An embodiment of the present application further provides a charging device, where the charging device includes a ripple current control circuit, and the ripple current control circuit can execute the method as shown in FIG. 6 .
  • FIG. 7 is a schematic diagram of a hardware structure of a charging device 400 according to an embodiment of the present application.
  • the charging device 400 includes: a memory 401 , a transceiver 402 , a processor 403 coupled with the memory 401 and the transceiver 402 , and a PFC+CLLC circuit 404 .
  • the memory 401 is used to store instructions
  • the processor 403 is used to execute the instructions
  • the transceiver 402 is used to communicate with other devices under the control of the processor 403, and the PFC+CLLC circuit 404 can complete the conversion from AC mains to high-voltage DC, so that the The switching power supply charges the vehicle power battery with constant current.
  • the processor 403 may be a Microcontroller Unit (MCU), a central processing unit (CPU), a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (application- specific integrated circuit, ASIC), field programmable gate array (FPGA), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. It may implement or execute various exemplary logical blocks, modules and circuits described in connection with the disclosure of the embodiments of this application.
  • the processor 403 may also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of a DSP and a microprocessor, and the like.
  • the transceiver 402 may be a communication interface, a transceiver circuit, etc., wherein the communication interface is a general term and may include one or more interfaces.
  • the charging device 400 may further include a bus 405 .
  • the memory 401, the transceiver 402, the processor 403 and the PFC+CLLC circuit 404 can be connected to each other through the bus 405;
  • the bus 405 can include a Controller Area Network (CAN), a Local Interconnect Network , LIN) and Ethernet bus (Industrial Ethernet bus, IE-bus) and other automotive bus technologies.
  • the bus 405 can be divided into an address bus, a data bus, a control bus, and the like. For ease of presentation, only one thick line is used in FIG. 7, but it does not mean that there is only one bus or one type of bus.
  • the charging device 400 in the embodiment of the present application may also include other Hardware, no further details on this.
  • the steps of the method or algorithm described in combination with the disclosure of the embodiments of this application may be implemented in a hardware manner, or may be implemented in a manner in which the processor 403 executes software instructions.
  • Software instructions can be composed of corresponding software modules, and software modules can be stored in random access memory (RAM), flash memory, read only memory (ROM), erasable programmable read only memory (erasable programmable rom, EPROM), electrically erasable programmable read-only memory (electrically eprom, EEPROM), registers, hard disk, removable hard disk, compact disk read only (CD-ROM) or any other form of storage medium well known in the art.
  • An exemplary storage medium is coupled to processor 403 such that processor 403 can read information from, and write information to, the storage medium.
  • the storage medium can also be a component of the processor 403 .
  • the processor 403 and the storage medium may be located in an application specific integrated circuit (Application Specific Integrated Circuit, ASIC).
  • ASIC Application Specific Integrated Circuit
  • the ASIC may be located in a network device.
  • the processor 403 and the storage medium may also exist in the network device as discrete components.
  • An embodiment of the present application further provides a vehicle, the vehicle includes the charging device as shown in FIG. 7 , and the charging device can execute the method as shown in FIG. 6 .
  • Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another.
  • a storage medium can be any available medium that can be accessed by a general purpose or special purpose computer.

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  • Power Engineering (AREA)
  • Transportation (AREA)
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  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
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Abstract

The present application provides a ripple current control method and system, and a device. The method can be applied to a PFC+CLLC circuit. Output current of a CLLC circuit is collected, a ripple current peak-to-peak value in the output current is calculated, whether output voltage VPFC of a PFC circuit needs to be adjusted is determined in combination with a threshold, and if yes, the output voltage VPFC of the PFC circuit is adjusted by means of a control module. By using the characteristic of the CLLC circuit that voltage change will cause change of the working frequency, the CLLC circuit is enabled to avoid the resonant frequency, thereby eliminating ripple current in the output current of the circuit, making direct current output by the circuit stable, and solving the problem that the ripple current affects the service life of a vehicle-mounted power battery.

Description

一种纹波电流控制方法、***及设备A ripple current control method, system and device 技术领域technical field
本申请涉及电路技术领域，尤其涉及一种纹波电流控制方法、***及设备。The present application relates to the field of circuit technology, and in particular, to a ripple current control method, system and device.
背景技术Background technique
车载充电机是为车载动力电池充电的设备，目前车载充电机大多采用开关电源。开关电源的输入电压为交流市电，频率通常在50Hz，输出为高压直流电。该开关电源内部的功率因数校正(Power Factor Correction，PFC)+双向谐振变换(LLC resonant converter，CLLC)电路能完成交流市电到高压直流电的转变，使开关电源为车载动力电池恒流充电。The car charger is a device for charging the car power battery. At present, most of the car chargers use switching power supplies. The input voltage of the switching power supply is AC mains, the frequency is usually 50Hz, and the output is high-voltage DC. The power factor correction (Power Factor Correction, PFC) + bidirectional resonant converter (LLC resonant converter, CLLC) circuit inside the switching power supply can complete the conversion from AC mains to high-voltage DC, so that the switching power supply can charge the vehicle power battery with constant current.
但是，PFC+CLLC电路对交流市电进行整流后输出的高压直流电中通常含有交流低频纹波，这种叠加在直流量上的交流低频纹波称为纹波电流。纹波电流会影响车载动力电池的寿命，进而影响汽车的正常使用。However, the high-voltage DC power output by the PFC+CLLC circuit after rectifying the AC mains usually contains AC low-frequency ripple, and the AC low-frequency ripple superimposed on the DC quantity is called ripple current. Ripple current will affect the life of the vehicle power battery, thereby affecting the normal use of the vehicle.
发明内容SUMMARY OF THE INVENTION
本申请的目的在于提供一种纹波电流控制方法，可以通过调整PFC电路的输出电压，改变调节CLLC谐振电路工作频率，使CLLC谐振电路远离谐振频率，避免环路振荡，从而减少纹波电流。The purpose of this application is to provide a ripple current control method, which can adjust the output voltage of the PFC circuit, change the operating frequency of the CLLC resonant circuit, keep the CLLC resonant circuit away from the resonant frequency, and avoid loop oscillation, thereby reducing the ripple current.
目标和其他目标将通过独立权利要求中的特征来达成。进一步的实现方式在从属权利要求、说明书和附图中体现。The objects and other objects are achieved by the features of the independent claims. Further implementations are embodied in the dependent claims, the description and the drawings.
第一方面，本申请提供一种纹波电流控制方法，该方法包括：采集输出电流，其中，输出电流为CLLC谐振电路的输出电流，上述CLLC谐振电路与PFC电路连接，上述PFC电路的输出电流是上述CLLC谐振电路的输入电流；确定上述输出电流携带的纹波电流的值，上述纹波电流会引起该输出电流幅值的变化，影响该输出电流的稳定性；根据所述纹波电流的值，通过脉冲宽度调制，调整所述PFC电路的输出电压。In a first aspect, the present application provides a ripple current control method, the method comprising: collecting an output current, wherein the output current is an output current of a CLLC resonant circuit, the CLLC resonant circuit is connected to a PFC circuit, and the output current of the PFC circuit is is the input current of the above-mentioned CLLC resonant circuit; determine the value of the ripple current carried by the above-mentioned output current, the above-mentioned ripple current will cause the change of the amplitude of the output current and affect the stability of the output current; according to the value of the ripple current value, through pulse width modulation, to adjust the output voltage of the PFC circuit.
这样，通过调节PFC电路的输出电压进而降低电路输出中纹波电流的值，避免纹波电流对车载动力电池产生较大影响。In this way, the value of the ripple current in the output of the circuit is reduced by adjusting the output voltage of the PFC circuit, so as to prevent the ripple current from having a great influence on the vehicle power battery.
结合第一方面，在一些实施例中，上述确定该输出电流携带的纹波电流的值包括：确定该输出电流携带的纹波电流的峰峰值，其中，该峰峰值为输出电流最大值与最小值的差值。With reference to the first aspect, in some embodiments, determining the value of the ripple current carried by the output current includes: determining the peak-to-peak value of the ripple current carried by the output current, where the peak-to-peak value is the maximum value and the minimum value of the output current difference in value.
结合第一方面，在一些实施例中，在确定输出电流携带的纹波电流的值之后，还包括：判断纹波电流的大小是否超过纹波电流的阈值；若判断为是，根据纹波电流的值，调整PFC电路的输出电压；若判断为否，维持PFC电路的输出电压不变。With reference to the first aspect, in some embodiments, after determining the value of the ripple current carried by the output current, the method further includes: judging whether the magnitude of the ripple current exceeds the threshold value of the ripple current; if the judgment is yes, according to the ripple current , adjust the output voltage of the PFC circuit; if the judgment is no, keep the output voltage of the PFC circuit unchanged.
结合第一方面，在一些实施例中，通过脉冲宽度调制，从高往低调整PFC电路的输出电压，直到所述纹波电流的值小于所述阈值，或者；通过脉冲宽度 调制，从低往高调整PFC电路的输出电压，直到所述纹波电流的值小于所述阈值。In combination with the first aspect, in some embodiments, the output voltage of the PFC circuit is adjusted from high to low through pulse width modulation until the value of the ripple current is less than the threshold value, or; through pulse width modulation, the output voltage of the PFC circuit is adjusted from low to low The output voltage of the PFC circuit is adjusted high until the value of the ripple current is less than the threshold.
结合第一方面，在一些实施例中，所述方法还包括：在通过脉冲宽度调制，从高往低调整PFC电路的输出电压后；或者，在通过脉冲宽度调制，从低往高调整PFC电路的输出电压后，将所述纹波电流的最小值对应的PFC电路的电压作为PFC电路的输出电压。With reference to the first aspect, in some embodiments, the method further includes: after adjusting the output voltage of the PFC circuit from high to low through pulse width modulation; or, after adjusting the PFC circuit from low to high through pulse width modulation After the output voltage is , the voltage of the PFC circuit corresponding to the minimum value of the ripple current is taken as the output voltage of the PFC circuit.
第二方面，本申请提供一种纹波电流控制***，其特征在于，该纹波电流控制***包括：采样模块，确定模块以及控制模块：上述采样模块用于采集输出电流，其中，输出电流为CLLC谐振电路的输出电流，CLLC谐振电路与PFC电路连接，上述PFC电路的输出电流是上述CLLC谐振电路的输入电流；上述确定模块用于确定输出电流携带的纹波电流的大小；上述控制模块用于根据纹波电流的值，通过脉冲宽度调制，调整PFC电路的输出电压。In a second aspect, the present application provides a ripple current control system, characterized in that the ripple current control system includes: a sampling module, a determination module, and a control module: the sampling module is used to collect output current, wherein the output current is The output current of the CLLC resonant circuit, the CLLC resonant circuit is connected to the PFC circuit, and the output current of the above-mentioned PFC circuit is the input current of the above-mentioned CLLC resonant circuit; the above-mentioned determination module is used to determine the magnitude of the ripple current carried by the output current; the above-mentioned control module uses According to the value of the ripple current, the output voltage of the PFC circuit is adjusted by pulse width modulation.
结合第二方面，在一些实施例中，上述纹波电流控制***还包括判断模块：该判断模块用于判断纹波电流的大小是否超过所述纹波电流的阈值；若判断为是，根据所述纹波电流的值，调整PFC电路的输出电压；若判断为否，维持所述PFC电路的输出电压不变。With reference to the second aspect, in some embodiments, the above-mentioned ripple current control system further includes a judgment module: the judgment module is used to judge whether the magnitude of the ripple current exceeds the threshold value of the ripple current; if the judgment is yes, according to the According to the value of the ripple current, the output voltage of the PFC circuit is adjusted; if the judgment is no, the output voltage of the PFC circuit is maintained unchanged.
第三方面，本申请实施例提供了一种纹波电流控制电路，所述纹波电流控制电路执行如第一方面的任一可能的实现方法。In a third aspect, an embodiment of the present application provides a ripple current control circuit, where the ripple current control circuit performs any possible implementation method of the first aspect.
第四方面，本申请提供一种充电装置，上述充电装置包括纹波电流控制电路，该纹波电流控制电路执行如第一方面的任一可能的实现方法。In a fourth aspect, the present application provides a charging device, the charging device includes a ripple current control circuit, and the ripple current control circuit performs any possible implementation method of the first aspect.
第五方面，本申请实施例提供了一种车辆，所述车辆包括充电装置，该充电装置执行如第一方面的任一可能的实现方法。In a fifth aspect, an embodiment of the present application provides a vehicle, where the vehicle includes a charging device, and the charging device performs any possible implementation method of the first aspect.
可以理解的是上述任一方面可以与其他任一方面或者多方面一起实施，也可以独立实施。It can be understood that any of the above-mentioned aspects can be implemented together with any other aspect or multiple aspects, and can also be implemented independently.
可以看到，本申请通过采集电路输出电流等信息，再通过纹波电流峰峰值与阈值判断PFC电路的输出电压是否需要调整，并能通过控制模块调整输出电压，进而消除电路的输出电流中的纹波电流，使电路输出直流稳定，从而解决了纹波电流影响车载动力电池的寿命问题。It can be seen that the application collects information such as the output current of the circuit, and then judges whether the output voltage of the PFC circuit needs to be adjusted through the peak-to-peak value and threshold value of the ripple current, and can adjust the output voltage through the control module, thereby eliminating the output current of the circuit. The ripple current stabilizes the DC output of the circuit, thus solving the problem that the ripple current affects the life of the vehicle power battery.
附图说明Description of drawings
为了更清楚地说明本申请实施例或背景技术中的技术方案，下面将对本申请实施例或背景技术中所需要使用的附图进行说明。In order to more clearly illustrate the technical solutions in the embodiments of the present application or the background technology, the accompanying drawings required in the embodiments or the background technology of the present application will be described below.
图1是本实施例提供的PFC+CLLC电路结构示意图；1 is a schematic diagram of the PFC+CLLC circuit structure provided in this embodiment;
图2是本实施例提供的PFC+CLLC电路示意图；2 is a schematic diagram of a PFC+CLLC circuit provided by the present embodiment;
图3是本实施例提供的纹波电流控制***示意图；FIG. 3 is a schematic diagram of a ripple current control system provided by this embodiment;
图4是本实施例提供的纹波电流控制***结构示意图；FIG. 4 is a schematic structural diagram of a ripple current control system provided in this embodiment;
图5是本实施例提供的纹波电流控制***与电路连接示意图；FIG. 5 is a schematic diagram of the connection between the ripple current control system and the circuit provided in this embodiment;
图6是本实施例提供的纹波电流控制方法流程示意图；FIG. 6 is a schematic flowchart of the ripple current control method provided in this embodiment;
图7是本实施例提供的充电装置结构示意图。FIG. 7 is a schematic structural diagram of the charging device provided in this embodiment.
具体实施方式Detailed ways
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行描述。应当理解，当在本说明书和所附权利要求书中使用时，术语“包括”和“包含”指示所描述特征、整体、步骤、操作、元素和/或组件的存在，但并不排除一个或多个其它特征、整体、步骤、操作、元素、组件和/或其集合的存在或添加。此外，术语“第一”、“第二”和“第三”等是用于区别不同的对象，而并非用于描述特定的顺序。The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application. It is to be understood that, when used in this specification and the appended claims, the terms "comprising" and "comprising" indicate the presence of the described features, integers, steps, operations, elements and/or components, but do not exclude one or The presence or addition of a number of other features, integers, steps, operations, elements, components, and/or sets thereof. In addition, the terms "first", "second", "third", etc. are used to distinguish different objects and not to describe a specific order.
需要说明的是，在本申请实施例中使用的术语是仅仅出于描述特定实施例的目的，而非旨在限制本申请。在本申请实施例和所附权利要求书中所使用的单数形式的“一种”、“所述”和“该”也旨在包括多数形式，除非上下文清楚地表示其他含义。还应当理解，本文中使用的术语“和/或”是指并包含一个或多个相关联的列出项目的任何或所有可能组合。It should be noted that the terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. As used in the embodiments of this application and the appended claims, the singular forms "a," "the," and "the" are intended to include the plural forms as well, unless the context clearly dictates otherwise. It will also be understood that the term "and/or" as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.
车载充电机是为车载动力电池充电的设备，目前车载充电机大多采用开关电源。开关电源的输入电压为交流市电，频率通常在50Hz，输出为高压直流电。该开关电源内部的PFC+CLLC电路能完成交流市电到高压直流电的转变，使开关电源为车载动力电池恒流充电。The car charger is a device for charging the car power battery. At present, most of the car chargers use switching power supplies. The input voltage of the switching power supply is AC mains, the frequency is usually 50Hz, and the output is high-voltage DC. The PFC+CLLC circuit inside the switching power supply can complete the transformation from AC mains to high-voltage DC, so that the switching power supply can charge the vehicle power battery with constant current.
为了便于理解本申请实施例，首先对本申请涉及的PFC+CLLC电路进行说明。In order to facilitate understanding of the embodiments of the present application, the PFC+CLLC circuit involved in the present application is first described.
如图1所示为一种PFC+CLLC电路100的结构示意图。由图1可知，PFC+CLLC电路100包括PFC电路101，大容量电容器C2，CLLC谐振电路102以及输出滤波电路103。如图1所示，PFC电路101的输入为交流，输出滤波电路103的输出为直流。FIG. 1 is a schematic structural diagram of a PFC+CLLC circuit 100 . As can be seen from FIG. 1 , the PFC+CLLC circuit 100 includes a PFC circuit 101 , a large-capacity capacitor C2 , a CLLC resonance circuit 102 and an output filter circuit 103 . As shown in FIG. 1 , the input of the PFC circuit 101 is AC, and the output of the output filter circuit 103 is DC.
下面针对上述PFC+CLLC电路100的结构和功能做详细介绍。The structure and function of the above-mentioned PFC+CLLC circuit 100 will be described in detail below.
如图1所示，PFC+CLLC电路100的交流输入端火线连接PFC电路101的第一端1011，PFC+CLLC电路100的交流输入端零线连接PFC电路101的第二端1012。PFC电路101的第三端1013连接大容量电容器C2的正极以及CLLC谐振电路102的第一端1021。PFC电路101的第四端1014连接大容量电容器C2的负极以及CLLC谐振电路102的第二端1022。CLLC谐振电路102的第三端1023连接输出滤波电路103的第一端1031，CLLC谐振电路102的第四端1024连接输出滤波电路103的第二端1032。PFC+CLLC电路100的正极输出连接输出滤波电路103的第三端1033，PFC+CLLC电路100的负极输出连接输出滤波电路103的第四端1034。As shown in FIG. 1 , the live wire of the AC input terminal of the PFC+CLLC circuit 100 is connected to the first terminal 1011 of the PFC circuit 101 , and the neutral wire of the AC input terminal of the PFC+CLLC circuit 100 is connected to the second terminal 1012 of the PFC circuit 101 . The third terminal 1013 of the PFC circuit 101 is connected to the anode of the bulk capacitor C2 and the first terminal 1021 of the CLLC resonant circuit 102 . The fourth terminal 1014 of the PFC circuit 101 is connected to the negative terminal of the bulk capacitor C2 and the second terminal 1022 of the CLLC resonant circuit 102 . The third terminal 1023 of the CLLC resonance circuit 102 is connected to the first terminal 1031 of the output filter circuit 103 , and the fourth terminal 1024 of the CLLC resonance circuit 102 is connected to the second terminal 1032 of the output filter circuit 103 . The positive output of the PFC+CLLC circuit 100 is connected to the third terminal 1033 of the output filter circuit 103 , and the negative output of the PFC+CLLC circuit 100 is connected to the fourth terminal 1034 of the output filter circuit 103 .
可选地，如图2所示，PFC电路101包括二极管D1与D2，电感L1，电容C1和N沟道增强型金属氧化物半导体场效应管(N-Metal-Oxide-Semiconductor Field-Effect Transistor,N-MOSFET，以下简称MOS管)Q1、Q2、Q3、Q4。Optionally, as shown in FIG. 2, the PFC circuit 101 includes diodes D1 and D2, an inductor L1, a capacitor C1 and an N-channel enhancement type metal oxide semiconductor field effect transistor (N-Metal-Oxide-Semiconductor Field-Effect Transistor, N-MOSFET, hereinafter referred to as MOS tube) Q1, Q2, Q3, Q4.
具体地，PFC+CLLC电路100的交流输入端火线连接二极管D1正极、电感L1的第一端e01和二极管D2的负极，二极管D1的负极连接MOS管Q1的漏极(Drain，D极)、电容C1的第一端e03、MOS管Q3的D极。电感L1的第二端e02连接MOS管Q1的源极(Source，S极)和MOS管Q2的D极。MOS管Q2的S极连接二极管D2的正极、电容C1的第二端e04与接MOS管Q4的S极。PFC+CLLC电路100的交流输入端零线连接MOS管Q4的D极与MOS管Q3的S极。Specifically, the live wire of the AC input terminal of the PFC+CLLC circuit 100 is connected to the anode of the diode D1, the first terminal e01 of the inductor L1 and the cathode of the diode D2, and the cathode of the diode D1 is connected to the drain (Drain, D pole) of the MOS transistor Q1, the capacitor The first end e03 of C1 and the D pole of the MOS transistor Q3. The second end e02 of the inductor L1 is connected to the source (Source, S pole) of the MOS transistor Q1 and the D pole of the MOS transistor Q2. The S pole of the MOS transistor Q2 is connected to the anode of the diode D2, the second end e04 of the capacitor C1 and the S pole of the MOS transistor Q4. The neutral line of the AC input terminal of the PFC+CLLC circuit 100 is connected to the D pole of the MOS transistor Q4 and the S pole of the MOS transistor Q3.
大容量电容器C2正极与PFC电路101的MOS管Q3的D极相连，大容量电容器C2负极与MOS管Q4的S极相连。The positive pole of the large-capacity capacitor C2 is connected to the D pole of the MOS transistor Q3 of the PFC circuit 101, and the negative pole of the large-capacity capacitor C2 is connected to the S pole of the MOS transistor Q4.
可选地，如图2所示，CLLC谐振电路102包括MOS管Q5、Q6、Q7、Q8、Q9、Q10、Q11、Q12，电感L2，电容C3、C4，变压器T1、变压器T2。Optionally, as shown in FIG. 2 , the CLLC resonant circuit 102 includes MOS transistors Q5 , Q6 , Q7 , Q8 , Q9 , Q10 , Q11 , and Q12 , an inductor L2 , capacitors C3 and C4 , a transformer T1 , and a transformer T2 .
具体地，大容量电容器C2正极连接MOS管Q5的D极和MOS管Q7的D极，大容量电容器C2负极连接MOS管Q6的S极和MOS管Q8的S极后接到原边地。MOS管Q5、Q6、Q7、Q8的栅极(Gate，G极)连接CLLC驱动电路，CLLC驱动电路在本实施例中不做详细说明。MOS管Q5的S极连接MOS管Q6的D极后连接电感L2的第一端e05，MOS管Q7的S极连接MOS管Q8的D极后连接电容C3的第一端e07。变压器T1与变压器T2的初级线圈串联后第一端连接电感L2的第二端e06，串联后的第二端连接电容C3的第二端e08。变压器T1与变压器T2的次级线圈并联后第一端连接MOS管Q9的S极和MOS管Q10的D极，次级线圈并联后第二端连接电容C4后连接MOS管Q11的S极和MOS管Q12的D极。MOS管Q9的D极与MOS管Q11的D极相连，MOS管Q10的S极与MOS管Q12的S极相连后连接到副边地。Specifically, the positive pole of the large-capacity capacitor C2 is connected to the D pole of the MOS transistor Q5 and the D pole of the MOS transistor Q7, and the negative pole of the large-capacity capacitor C2 is connected to the S pole of the MOS transistor Q6 and the S pole of the MOS transistor Q8 and then connected to the primary side ground. The gates (Gate, G poles) of the MOS transistors Q5, Q6, Q7, and Q8 are connected to the CLLC driving circuit, and the CLLC driving circuit is not described in detail in this embodiment. The S pole of the MOS transistor Q5 is connected to the D pole of the MOS transistor Q6 and then to the first end e05 of the inductor L2. The S pole of the MOS transistor Q7 is connected to the D pole of the MOS transistor Q8 and then to the first end e07 of the capacitor C3. The first end of the transformer T1 and the primary coil of the transformer T2 are connected in series to the second end e06 of the inductor L2, and the second end after the series connection is connected to the second end e08 of the capacitor C3. The transformer T1 is connected in parallel with the secondary coil of the transformer T2, and the first end is connected to the S pole of the MOS transistor Q9 and the D pole of the MOS transistor Q10. D pole of tube Q12. The D pole of the MOS transistor Q9 is connected to the D pole of the MOS transistor Q11, and the S pole of the MOS transistor Q10 is connected to the S pole of the MOS transistor Q12 and then connected to the secondary side ground.
可选地，输出滤波电路103包括电容C5、C7、C8，电感L3，大容量电容器C6，共模电感L4，机壳J1，保险丝F1。Optionally, the output filter circuit 103 includes capacitors C5, C7, C8, an inductor L3, a large-capacity capacitor C6, a common-mode inductor L4, a casing J1, and a fuse F1.
具体地，电容C5的第一端e09与电感L3的第一端e11连接到CLLC谐振电路102中MOS管Q11的D极，电感L3的第二端e12连接大容量电容C6的正极和共模电感L4的第一端e13，电容C5的第二端e10连接大容量电容C6的负极和共模电感L4的第二端e14后连接到副边地。电容C7与电容C8串联后并联到共模电感L4的第三端e15与第四端e16，其中，电容C7与电容C8中间连接机壳J1，共模电感L4第三端e15连接保险丝F1后连接PFC+CLLC电路100直流输出的正极，共模电感L4第四端e16连接PFC+CLLC电路100直流输出的负极。Specifically, the first terminal e09 of the capacitor C5 and the first terminal e11 of the inductor L3 are connected to the D pole of the MOS transistor Q11 in the CLLC resonant circuit 102, and the second terminal e12 of the inductor L3 is connected to the positive pole of the bulk capacitor C6 and the common mode inductor The first end e13 of the L4 and the second end e10 of the capacitor C5 are connected to the negative electrode of the bulk capacitor C6 and the second end e14 of the common mode inductor L4 and then connected to the secondary side ground. The capacitor C7 and the capacitor C8 are connected in series with the third terminal e15 and the fourth terminal e16 of the common mode inductor L4, wherein the capacitor C7 and the capacitor C8 are connected to the casing J1 in the middle, and the third terminal e15 of the common mode inductor L4 is connected to the fuse F1. The positive pole of the DC output of the PFC+CLLC circuit 100 is connected to the fourth terminal e16 of the common mode inductor L4 to the negative pole of the DC output of the PFC+CLLC circuit 100 .
PFC电路101通过调整输入电流与输入电压的相位来校正功率因数，同时PFC电路101还可以将输入的交流电压转换成高压直流电压；大容量电容器C2为PFC电路101的储能电容；CLLC谐振电路102是一种隔离型DC-DC功率隔离变换电路，利用LC谐振特性，使得在电源为直流电源时，电路中的电流按照正弦规律变化，此时电流就存在过零点的情况，如果此时开关器件开通 或关断，产生的损耗就为零，即实现了CLLC谐振电路102软开关的功能。The PFC circuit 101 corrects the power factor by adjusting the phase of the input current and the input voltage, and the PFC circuit 101 can also convert the input AC voltage into a high-voltage DC voltage; the large-capacity capacitor C2 is the energy storage capacitor of the PFC circuit 101; the CLLC resonant circuit 102 is an isolated DC-DC power isolation conversion circuit, using the LC resonance characteristic, so that when the power supply is a DC power supply, the current in the circuit changes according to a sinusoidal law, and the current has a zero-crossing situation at this time. When the device is turned on or off, the resulting loss is zero, that is, the soft switching function of the CLLC resonant circuit 102 is realized.
根据以上描述可知，PFC电路101能将输入的交流电压转换成高压直流电压，但高压直流输出会不可避免的叠加了部分交流成分，即纹波电流，而在CLLC谐振电路102进行DC-DC变换时，纹波电流也会被叠加到CLLC谐振电路102的输出电流上，同时，CLLC谐振电路102也会产生纹波电流。其中，纹波电流或电压是指的电流中的高次谐波成分,会带来电流或电压幅值的变化,可能导致击穿。同样地，由于是交流成分,还会在电容上发生耗散,超过了电容的最大容许纹波电流,会导致电容烧毁，最终影响车载动力电池的寿命，进而影响汽车的正常使用。It can be seen from the above description that the PFC circuit 101 can convert the input AC voltage into a high-voltage DC voltage, but the high-voltage DC output will inevitably superimpose some AC components, that is, ripple current, and the DC-DC conversion is performed in the CLLC resonant circuit 102 , the ripple current will also be superimposed on the output current of the CLLC resonant circuit 102 , and at the same time, the CLLC resonant circuit 102 will also generate a ripple current. Among them, the ripple current or voltage refers to the high-order harmonic components in the current, which will bring about changes in the current or voltage amplitude, which may lead to breakdown. Similarly, due to the AC component, it will also dissipate on the capacitor, which exceeds the maximum allowable ripple current of the capacitor, which will cause the capacitor to burn, which will ultimately affect the life of the vehicle power battery, which in turn affects the normal use of the car.
目前，消除纹波电流的方式有两种，一种是在电源输出端加入滤波电路(LC滤波电路或RC滤波电路)可以滤除输出电压中夹杂的纹波电流，但是由于体积的限制，LC滤波电路所使用的滤波电感尺寸无法尽可能地做大，因此无法尽量多地减小纹波电流。另外，在具体使用中RC滤波电路的滤波电容在增加到一定程度时，其对减小纹波电流的效果明显降低了，同时增加了成本和应用空间的要求。At present, there are two ways to eliminate the ripple current. One is to add a filter circuit (LC filter circuit or RC filter circuit) at the output of the power supply to filter out the ripple current contained in the output voltage. However, due to volume limitations, LC The size of the filter inductor used in the filter circuit cannot be as large as possible, so the ripple current cannot be reduced as much as possible. In addition, when the filter capacitor of the RC filter circuit is increased to a certain level in specific use, its effect on reducing the ripple current is significantly reduced, and the cost and application space requirements are increased at the same time.
另一种是通过调节反馈回路的PI参数。具体地，根据给定值与实际输出值构成控制偏差，将偏差的比例(P)和积分(I)通过线性组合构成控制量，对被控对象进行控制。比例作用越大，调节速度就越快，但是***的稳定性会下降。同时，由于CLLC谐振电路102输出电压/电流范围宽，工作频率范围宽，其不同输出电压/电流工况可能在CLLC谐振频率以上，也可能在CLLC谐振频率以下，或工作在谐振频率点。当工作频率在谐振频率点附近时，CLLC谐振电路102极易产生振荡，此时输出的纹波电流也无法通过PI参数调节。The other is by adjusting the PI parameters of the feedback loop. Specifically, the control deviation is formed according to the given value and the actual output value, and the proportional (P) and integral (I) of the deviation are linearly combined to form a control amount to control the controlled object. The larger the proportional action, the faster the adjustment speed, but the stability of the system will decrease. At the same time, due to the wide output voltage/current range and wide operating frequency range of the CLLC resonant circuit 102, its different output voltage/current operating conditions may be above the CLLC resonant frequency, or below the CLLC resonant frequency, or work at the resonant frequency. When the operating frequency is near the resonant frequency point, the CLLC resonant circuit 102 is very easy to oscillate, and the output ripple current cannot be adjusted by the PI parameter.
为了解决纹波电流影响车载动力电池的寿命问题，本申请实施例提供了一种纹波电流控制***200，该***通过调整PFC电路101的输出电压，从而调节CLLC工作频率，使CLLC谐振电路102远离谐振频率，避免环路振荡，从而减少纹波电流。In order to solve the problem that the ripple current affects the life of the vehicle power battery, an embodiment of the present application provides a ripple current control system 200 , which adjusts the output voltage of the PFC circuit 101 to adjust the CLLC operating frequency, so that the CLLC resonant circuit 102 Move away from the resonant frequency to avoid loop oscillation, thereby reducing ripple current.
本申请实施例提供的一种纹波电流控制***200，如图3所示，控制***连接输出滤波电路103的第五端2001与PFC电路101的第五端2002。纹波电流控制***200可以根据CLLC谐振电路102的输出的纹波电流，调整PFC电路101的输出电压，进而控制CLLC谐振电路102的工作频率，避免CLLC谐振电路102工作在谐振频率点产生的振荡。In a ripple current control system 200 provided by an embodiment of the present application, as shown in FIG. 3 , the control system is connected to the fifth end 2001 of the output filter circuit 103 and the fifth end 2002 of the PFC circuit 101 . The ripple current control system 200 can adjust the output voltage of the PFC circuit 101 according to the output ripple current of the CLLC resonant circuit 102, thereby controlling the operating frequency of the CLLC resonant circuit 102 to avoid the oscillation generated by the CLLC resonant circuit 102 operating at the resonant frequency point. .
本申请对该纹波电流控制***200中的功能单元的划分不做限定，可以根据需要对该纹波电流控制***200中的各个模块进行增加、减少或合并，各个模块可以是软件模块，也可以是硬件模块，也可以部分是软件模块部分是硬件模块，本申请不对其进行限制。如图4所示，示例性地提供了一种功能模块的划分：纹波电流控制***200由采样模块210，计算模块220，判断模块230以及控制模块240组成。下面分别介绍每个部分的功能。The application does not limit the division of the functional units in the ripple current control system 200, and each module in the ripple current control system 200 can be added, reduced or combined as required. It may be a hardware module, or a part of a software module and a part of a hardware module, which is not limited in this application. As shown in FIG. 4 , a division of functional modules is exemplarily provided: the ripple current control system 200 is composed of a sampling module 210 , a calculation module 220 , a judgment module 230 and a control module 240 . The function of each part is described below.
采样模块210用于采集CLLC谐振电路102的输出电流I CLLC和PFC电路 101的输出电压V PFC，其中，输出电流I CLLC数据将发送给计算模块220，输出电压V PFC将发送给控制模块240。上述输出电流I CLLC包括了纹波电流，该纹波电流为输出电流I CLLC携带的高次谐波成分。 The sampling module 210 is used to collect the output current I CLLC of the CLLC resonant circuit 102 and the output voltage V PFC of the PFC circuit 101 . The above-mentioned output current I CLLC includes a ripple current, and the ripple current is a high-order harmonic component carried by the output current I CLLC .
计算模块220用于获取输出电流I CLLC数据，并计算输出电流I CLLC输出电流最大值和最小值的差值，该差值即为纹波电流峰峰值I pk。计算模块220将计算得到的纹波电流峰峰值I pk发送给判断模块230。 The calculation module 220 is configured to obtain the data of the output current I CLLC and calculate the difference between the maximum value and the minimum value of the output current I CLLC , and the difference is the peak-to-peak value of the ripple current I pk . The calculation module 220 sends the calculated peak-to-peak value I pk of the ripple current to the judgment module 230 .
判断模块230用于通过将纹波电流阈值I S与实际纹波电流峰峰值I pk进行比较，判断是否需要对输出电压V PFC进行调整，若需要调整，将发送调整信息给控制模块240，由控制模块240完成PFC电路101的输出电压V PFC的控制，直到纹波电流峰峰值I pk达到纹波电流阈值I S；若判断结果为不需要调整，将维持输出电压V PFC不变。 The judgment module 230 is used to judge whether the output voltage V PFC needs to be adjusted by comparing the ripple current threshold I S with the actual ripple current peak-to-peak value I pk . The control module 240 completes the control of the output voltage VPFC of the PFC circuit 101 until the peak-to-peak value of the ripple current Ipk reaches the ripple current threshold IS ; if it is determined that no adjustment is required, the output voltage VPFC will remain unchanged.
控制模块240用于接收判断模块230发送的调整信息与采样模块210采集到的输出电压V PFC信息并调整输出电压V PFC。具体地，控制模块240接收到判断模块230发送的调整信息后，通过调整PFC电路101中MOS管Q1、Q2、Q3以及Q4占空比，进而控制PFC电路101的输出电压V PFC，直到纹波电流峰峰值I pk达到纹波电流阈值I S。 The control module 240 is configured to receive the adjustment information sent by the determination module 230 and the output voltage V PFC information collected by the sampling module 210 and adjust the output voltage V PFC . Specifically, after receiving the adjustment information sent by the judgment module 230, the control module 240 adjusts the duty ratios of the MOS transistors Q1, Q2, Q3 and Q4 in the PFC circuit 101 to control the output voltage VPFC of the PFC circuit 101 until the ripple The current peak-to-peak value I pk reaches the ripple current threshold value IS .
纹波电流控制***200的功能模块与PFC+CLLC电路100的连接关系如图5所示，PFC+CLLC电路100的详细介绍可参见图2的描述，纹波电流控制***200功能模块的详细介绍可参见图4的描述，此处不再赘述。The connection relationship between the functional modules of the ripple current control system 200 and the PFC+CLLC circuit 100 is shown in FIG. 5 , the detailed description of the PFC+CLLC circuit 100 can refer to the description of FIG. Reference may be made to the description of FIG. 4 , which will not be repeated here.
综上，本申请实施例提供的纹波电流控制***200，通过采集电路输出电流等信息，再通过纹波电流峰峰值与阈值判断PFC电路101的输出电压V PFC是否需要调整，并能通过控制模块240调整输出电压V PFC，进而消除电路的输出电流中的纹波电流，使电路输出直流稳定，解决纹波电流影响车载动力电池的寿命问题。 To sum up, the ripple current control system 200 provided by the embodiment of the present application can determine whether the output voltage V PFC of the PFC circuit 101 needs to be adjusted by collecting information such as the output current of the circuit, and then determining whether the output voltage V PFC of the PFC circuit 101 needs to be adjusted according to the peak-to-peak value and the threshold value of the ripple current, and can control The module 240 adjusts the output voltage VPFC , thereby eliminating the ripple current in the output current of the circuit, so as to stabilize the output DC of the circuit, and solve the problem that the ripple current affects the life of the vehicle power battery.
下面结合附图，对本申请提供的纹波电流控制***200如何调整PFC+CLLC电路100输出电流中的纹波电流进行详细介绍。The following describes in detail how the ripple current control system 200 provided by the present application adjusts the ripple current in the output current of the PFC+CLLC circuit 100 with reference to the accompanying drawings.
如图6所示，本申请提供了一种纹波电流控制方法，所述方法包括以下步骤：As shown in FIG. 6, the present application provides a ripple current control method, and the method includes the following steps:
S310：采集输出电流I CLLC。 S310: Collect the output current I CLLC .
具体地，采集模块210采集CLLC谐振电路102的输出电流I CLLC，输出电流I CLLC包括了纹波电流，该纹波电流为输出电流I CLLC携带的高次谐波成分。示例性地，如图5所示，采集模块210采集电感L3第二端e12处的电流，该处电流等效于CLLC谐振电路102的输出电流I CLLC。 Specifically, the collection module 210 collects the output current I CLLC of the CLLC resonant circuit 102 , the output current I CLLC includes a ripple current, and the ripple current is a high-order harmonic component carried by the output current I CLLC . Exemplarily, as shown in FIG. 5 , the collection module 210 collects the current at the second end e12 of the inductor L3 , where the current is equivalent to the output current I CLLC of the CLLC resonant circuit 102 .
S320：计算纹波电流峰峰值I pk。 S320: Calculate the peak-to-peak value I pk of the ripple current.
具体地，通过CLLC谐振电路102的输出电流I CLLC计算出其携带的纹波电流峰峰值I pk。输出电流I CLLC理想状态下应该为直流，但因为PFC电路会在交流电转变为直流电时在输出的直流电中还携带部分交流成分，因此，纹波电流峰峰值I pk计算方式为输出电流的I CLLC的最大值与最小值的差值。 Specifically, the peak-to-peak value I pk of the ripple current carried by the CLLC resonant circuit 102 is calculated from the output current I CLLC of the CLLC resonant circuit 102 . The output current I CLLC should ideally be DC, but because the PFC circuit will also carry some AC components in the output DC when the AC is converted to DC, therefore, the peak-to-peak value I pk of the ripple current is calculated as the output current I CLLC The difference between the maximum value and the minimum value of .
S330：判断输出电压V PFC是否需要调整。 S330: Determine whether the output voltage V PFC needs to be adjusted.
具体地，通过计算模块220计算得到的纹波电流峰峰值I pk与纹波电流阈值I S进行比较，判断是否需要对输出电压V PFC调整。其中，纹波电流阈值I S为对车载动力电池影响较小或影响可忽略不计的纹波电流值，该纹波电流阈值I S也可以由用户自定义设定。 Specifically, the ripple current peak-to-peak value I pk calculated by the calculation module 220 is compared with the ripple current threshold value IS to determine whether the output voltage V PFC needs to be adjusted. The ripple current threshold IS is a ripple current value that has little or negligible impact on the vehicle power battery, and the ripple current threshold IS can also be set by the user.
S3301：维持输出电压V PFC不变。 S3301: Keep the output voltage V PFC unchanged.
具体地，若纹波电流峰峰值I pk小于纹波电流阈值I S，则认为当前电路纹波电流不会对电路产生较大影响或影响可忽略不计，只需要维持输出电压V PFC不变即可。 Specifically, if the peak-to-peak value of the ripple current I pk is less than the ripple current threshold I S , it is considered that the current circuit ripple current will not have a large impact on the circuit or the impact can be ignored, and it is only necessary to maintain the output voltage VPFC unchanged. Can.
S340：调整输出电压V PFC。 S340: Adjust the output voltage VPFC .
具体地，对实际PFC电路101输出电压V PFC进行采样，按照固有步进量从高往低，或从低往高调整输出电压V PFC，完成调整后将继续执行步骤S310，直到纹波电流峰峰值I pk达到纹波电流阈值I S时，设定该工况下的PFC电路101的输出电压，并维持输出电压V PFC不变。 Specifically, the actual PFC circuit 101 output voltage VPFC is sampled, and the output voltage VPFC is adjusted from high to low or from low to high according to the inherent step size. After the adjustment is completed, step S310 will continue to be performed until the ripple current peaks. When the peak value I pk reaches the ripple current threshold value IS , the output voltage of the PFC circuit 101 under this working condition is set, and the output voltage V PFC is kept unchanged.
其中，调整输出电压V PFC采用脉冲宽度调制(Pulse width modulation，PWM)，如图5所示，对大容量电容器C2正极的电压进行采样，通过控制模块240调整MOS管Q1、Q2、Q3、Q4G极的偏置，来实现MOS管导通时间的改变，进而在PFC电路101的电压范围从高往低或者从低往高调整PFC电路101的输出电压V PFC，直到纹波电流峰峰值I pk达到纹波电流阈值I S。若完成从高往低或从低往高调整后纹波电流峰峰值I pk仍未达到纹波电流阈值I S，则将输出电压V PFC设定为调整过程中纹波电流峰峰值I pk为最小值对应的V PFC。 Pulse width modulation (PWM) is used to adjust the output voltage V PFC . As shown in FIG. 5 , the voltage of the positive electrode of the large-capacity capacitor C2 is sampled, and the MOS transistors Q1, Q2, Q3, and Q4G are adjusted by the control module 240. The voltage range of the PFC circuit 101 is adjusted from high to low or from low to high to adjust the output voltage V PFC of the PFC circuit 101 until the peak-to-peak value of the ripple current I pk The ripple current threshold IS is reached. If the ripple current peak-to-peak value I pk does not reach the ripple current threshold value IS after the adjustment from high to low or from low to high is completed, the output voltage VPFC is set to the peak-to-peak value I pk of the ripple current during the adjustment process. The minimum value corresponds to VPFC .
举例来说，固有步进可以为每100毫秒1伏特，即1V/100ms，PFC电路101的电压范围为380V-415V，因此，先从415V往下调整V PFC，同时监测纹波电流峰峰值I pk，如在调整过程中达到纹波电流阈值I S，则停止调整。若PFC电压已调至下限380V还未达到纹波电流阈值I S，则继续从最低往高调，调整过程中监测纹波电流峰峰值I pk是否达到纹波电流阈值I S，若达到则停止调整。如果完成从高往低或从低往高调整一遍后仍未达到纹波电流阈值I S，则以在调整过程中纹波电流最小值的PFC电压设定。 For example, the inherent step can be 1 volt every 100 milliseconds, that is, 1V/100ms, and the voltage range of the PFC circuit 101 is 380V-415V. Therefore, first adjust VPFC from 415V down, while monitoring the peak-to-peak ripple current I pk , if the ripple current threshold IS is reached during the adjustment process, the adjustment will be stopped. If the PFC voltage has been adjusted to the lower limit of 380V and has not reached the ripple current threshold I S , continue to adjust from the lowest to the higher. During the adjustment process, monitor whether the peak-to-peak value I pk of the ripple current reaches the ripple current threshold I S , and stop adjusting if it is reached. . If the ripple current threshold IS is not reached after the adjustment from high to low or from low to high is completed, set the PFC voltage with the minimum value of the ripple current during the adjustment process.
综上，本申请实施例提供的纹波电流控制方法，通过采集电路输出电流等信息，再通过纹波电流峰峰值与阈值判断PFC电路101的输出电压V PFC是否需要调整，并能通过控制模块240调整输出电压V PFC，进而消除电路的输出电流中的纹波电流，使电路输出直流稳定，解决纹波电流影响车载动力电池的寿命问题。 To sum up, in the ripple current control method provided by the embodiments of the present application, by collecting information such as the output current of the circuit, and then determining whether the output voltage V PFC of the PFC circuit 101 needs to be adjusted according to the peak-to-peak value and the threshold value of the ripple current, and can be adjusted by the control module 240 adjusts the output voltage VPFC , thereby eliminating the ripple current in the output current of the circuit, making the circuit output DC stable, and solving the problem that the ripple current affects the life of the vehicle power battery.
接下来对本实施例的工作原理进行详细介绍。Next, the working principle of this embodiment will be described in detail.
如下公式1为CLLC谐振电路102的增益函数G。Equation 1 below is the gain function G of the CLLC resonant circuit 102 .
Figure PCTCN2021075880-appb-000001
Figure PCTCN2021075880-appb-000001
其中，V OUT为CLLC谐振电路102的输出电压，V PFC为CLLC电路102 的输入电压，即PFC电路101的输出电压。 Wherein, V OUT is the output voltage of the CLLC resonant circuit 102 , and V PFC is the input voltage of the CLLC circuit 102 , that is, the output voltage of the PFC circuit 101 .
CLLC谐振电路102的增益函数G与频率相关的表达式G(f)可以如公式2所示。The frequency-dependent expression G(f) of the gain function G of the CLLC resonant circuit 102 may be as shown in Equation 2.
Figure PCTCN2021075880-appb-000002
Figure PCTCN2021075880-appb-000002
其中，如公式3所示，x为CLLC谐振电路102该工况下实际工作频率f与谐振频率f r的比值。 Wherein, as shown in formula 3, x is the ratio of the actual operating frequency f to the resonant frequency fr of the CLLC resonant circuit 102 under this operating condition.
Figure PCTCN2021075880-appb-000003
Figure PCTCN2021075880-appb-000003
谐振频率f r的计算方法如公式4所示，其中，谐振电感L r为CLLC谐振电路102的电感的L2电感值，C r为谐振电容。 The calculation method of the resonant frequency fr is shown in formula 4, wherein the resonant inductance L r is the L2 inductance value of the inductance of the CLLC resonant circuit 102 , and C r is the resonant capacitance.
Figure PCTCN2021075880-appb-000004
Figure PCTCN2021075880-appb-000004
如公式5所示，k为励磁电感L p与谐振电感L r的比值，其中，励磁电感L p为变压器T1与变压器T2初级线圈串联后的电感值。 As shown in formula 5, k is the ratio of the excitation inductance L p to the resonant inductance L r , where the excitation inductance L p is the inductance value of the transformer T1 and the primary coil of the transformer T2 in series.
Figure PCTCN2021075880-appb-000005
Figure PCTCN2021075880-appb-000005
Q为品质因数，具体计算方式如公式6所示，其中，R ac为负载电阻阻值。 Q is the quality factor, and the specific calculation method is shown in Equation 6, where R ac is the resistance value of the load resistance.
Figure PCTCN2021075880-appb-000006
Figure PCTCN2021075880-appb-000006
应理解上述公式1-公式6仅用于说明，本申请不作具体限定。It should be understood that the above formula 1 to formula 6 are only for illustration, and are not specifically limited in this application.
根据以上描述可知，CLLC谐振电路102实际工作频率f由CLLC谐振电路102输入电压V PFC，CLLC谐振电路102的固有参数(如L r、L p、C r、R ac)以及CLLC谐振电路102的输出电压V OUT决定。可以理解地，若调整CLLC谐振电路102输入电压V PFC，在CLLC谐振电路102的固有参数不变的情况下，为达到需求输出电压，则实际工作频率f必将发生变化。因此，通过调整PFC电路101的输入电压，进而调整CLLC谐振电路102输入电压V PFC来改变CLLC谐振电路102的实际工作频率f，使CLLC谐振电路102工况下远离谐振频率。 According to the above description, the actual operating frequency f of the CLLC resonant circuit 102 is determined by the input voltage V PFC of the CLLC resonant circuit 102 , the inherent parameters of the CLLC resonant circuit 102 (such as L r , L p , C r , R ac ) and the CLLC resonant circuit 102 The output voltage V OUT is determined. Understandably, if the input voltage V PFC of the CLLC resonant circuit 102 is adjusted, the actual operating frequency f must change in order to achieve the required output voltage under the condition that the inherent parameters of the CLLC resonant circuit 102 remain unchanged. Therefore, the actual operating frequency f of the CLLC resonant circuit 102 is changed by adjusting the input voltage of the PFC circuit 101 and then the input voltage V PFC of the CLLC resonant circuit 102 , so that the CLLC resonant circuit 102 is far away from the resonant frequency under operating conditions.
本申请实施例还提供了一种纹波电流控制电路，该纹波电流控制电路可以执行步骤S310-步骤S340所述方法。本申请实施例还提供了一种充电装置，所述充电装置包括纹波电流控制电路，纹波电流控制电路可以执行如图6所述的方法。The embodiment of the present application further provides a ripple current control circuit, and the ripple current control circuit can execute the methods described in steps S310 to S340. An embodiment of the present application further provides a charging device, where the charging device includes a ripple current control circuit, and the ripple current control circuit can execute the method as shown in FIG. 6 .
请参见图7，图7为本申请实施例提供的一种充电装置400的硬件结构示意图。充电装置400包括：存储器401、收发器402、与所述存储器401和收发器402耦合的处理器403，以及PFC+CLLC电路404。存储器401用于存储指令，处理器403用于执行指令，收发器402用于在处理器403的控制下与其他设备进行通信，PFC+CLLC电路404能完成交流市电到高压直流电的转变，使开关电源为车载动力电池恒流充电。Please refer to FIG. 7 , which is a schematic diagram of a hardware structure of a charging device 400 according to an embodiment of the present application. The charging device 400 includes: a memory 401 , a transceiver 402 , a processor 403 coupled with the memory 401 and the transceiver 402 , and a PFC+CLLC circuit 404 . The memory 401 is used to store instructions, the processor 403 is used to execute the instructions, the transceiver 402 is used to communicate with other devices under the control of the processor 403, and the PFC+CLLC circuit 404 can complete the conversion from AC mains to high-voltage DC, so that the The switching power supply charges the vehicle power battery with constant current.
其中，处理器403可以是微控制单元(Microcontroller Unit，MCU)，中央处理器(central processing unit，CPU)，通用处理器，数字信号处理器(digital signal processor，DSP)，专用集成电路(application-specific integrated circuit，ASIC)，现场可编程门阵列(field programmable gate array，FPGA)或者其他可编程逻辑器件、晶体管逻辑器件、硬件部件或者其任意组合。其可以实现或执行结合本申请实施例公开内容所描述的各种示例性的逻辑方框，模块和电路。处理器403也可以是实现计算功能的组合，例如包含一个或多个微处理器组合，DSP和微处理器的组合等等。收发器402可以是通信接口、收发电路等，其中，通信接口是统称，可以包括一个或多个接口。The processor 403 may be a Microcontroller Unit (MCU), a central processing unit (CPU), a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (application- specific integrated circuit, ASIC), field programmable gate array (FPGA), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. It may implement or execute various exemplary logical blocks, modules and circuits described in connection with the disclosure of the embodiments of this application. The processor 403 may also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of a DSP and a microprocessor, and the like. The transceiver 402 may be a communication interface, a transceiver circuit, etc., wherein the communication interface is a general term and may include one or more interfaces.
可选地，充电装置400还可以包括总线405。其中，存储器401、收发器402、处理器403以及PFC+CLLC电路404可以通过总线405相互连接；总线405可以是包括控制器局域网络(Controller Area Network,CAN)、局域互联网络(Local Interconnect Network，LIN)以及以太网总线(Industrial Ethernet bus，IE-bus)等汽车总线技术。总线405可以分为地址总线、数据总线、控制总线等。为便于表示，图7中仅用一条粗线表示，但并不表示仅有一根总线或一种类型的总线。Optionally, the charging device 400 may further include a bus 405 . Wherein, the memory 401, the transceiver 402, the processor 403 and the PFC+CLLC circuit 404 can be connected to each other through the bus 405; the bus 405 can include a Controller Area Network (CAN), a Local Interconnect Network , LIN) and Ethernet bus (Industrial Ethernet bus, IE-bus) and other automotive bus technologies. The bus 405 can be divided into an address bus, a data bus, a control bus, and the like. For ease of presentation, only one thick line is used in FIG. 7, but it does not mean that there is only one bus or one type of bus.
除了图7所示的存储器401、收发器402、处理器403、PFC+CLLC电路404以及上述总线405之外，本申请实施例中充电装置400通常根据该充电装置的实际功能，还可以包括其他硬件，对此不再赘述。In addition to the memory 401, the transceiver 402, the processor 403, the PFC+CLLC circuit 404, and the above-mentioned bus 405 shown in FIG. 7, the charging device 400 in the embodiment of the present application may also include other Hardware, no further details on this.
结合本申请实施例公开内容所描述的方法或者算法的步骤可以硬件的方式来实现，也可以是由处理器403执行软件指令的方式来实现。软件指令可以由相应的软件模块组成，软件模块可以被存放于随机存取存储器(random access memory，RAM)、闪存、只读存储器(read only memory，ROM)、可擦除可编程只读存储器(erasable programmable rom，EPROM)、电可擦可编程只读存储器(electrically eprom，EEPROM)、寄存器、硬盘、移动硬盘、只读光盘(CD-ROM)或者本领域熟知的任何其它形式的存储介质中。一种示例性的存储介质耦合至处理器403，从而使处理器403能够从该存储介质读取信息，且可向该存储介质写入信息。当然，存储介质也可以是处理器403的组成部分。处理器403和存储介质可以位于专用集成电路(Application Specific Integrated Circuit，ASIC)中。另外，该ASIC可以位于网络设备中。当然，处理器403和存储介质也可以作为分立组件存在于网络设备中。The steps of the method or algorithm described in combination with the disclosure of the embodiments of this application may be implemented in a hardware manner, or may be implemented in a manner in which the processor 403 executes software instructions. Software instructions can be composed of corresponding software modules, and software modules can be stored in random access memory (RAM), flash memory, read only memory (ROM), erasable programmable read only memory ( erasable programmable rom, EPROM), electrically erasable programmable read-only memory (electrically eprom, EEPROM), registers, hard disk, removable hard disk, compact disk read only (CD-ROM) or any other form of storage medium well known in the art. An exemplary storage medium is coupled to processor 403 such that processor 403 can read information from, and write information to, the storage medium. Of course, the storage medium can also be a component of the processor 403 . The processor 403 and the storage medium may be located in an application specific integrated circuit (Application Specific Integrated Circuit, ASIC). Alternatively, the ASIC may be located in a network device. Of course, the processor 403 and the storage medium may also exist in the network device as discrete components.
本申请实施例还提供了一种车辆，该车辆包括如图7所述的充电装置，所 述充电装置可以执行如图6所述方法。An embodiment of the present application further provides a vehicle, the vehicle includes the charging device as shown in FIG. 7 , and the charging device can execute the method as shown in FIG. 6 .
本领域技术人员应该可以意识到，在上述一个或多个示例中，本申请实施例所描述的功能可以用硬件、软件、固件或它们的任意组合来实现。当使用软件实现时，可以将这些功能存储在计算机可读介质中或者作为计算机可读介质上的一个或多个指令或代码进行传输。计算机可读介质包括计算机存储介质和通信介质，其中通信介质包括便于从一个地方向另一个地方传送计算机程序的任何介质。存储介质可以是通用或专用计算机能够存取的任何可用介质。Those skilled in the art should realize that, in one or more of the above examples, the functions described in the embodiments of the present application may be implemented by hardware, software, firmware, or any combination thereof. When implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage medium can be any available medium that can be accessed by a general purpose or special purpose computer.
以上所述的具体实施方式，对本申请实施例的目的、技术方案和有益效果进行了进一步详细说明，所应理解的是，以上所述仅为本申请实施例的具体实施方式而已，并不用于限定本申请实施例的保护范围，凡在本申请实施例的技术方案的基础之上，所做的任何修改、等同替换、改进等，均应包括在本申请实施例的保护范围之内。The specific embodiments described above further describe in detail the purposes, technical solutions and beneficial effects of the embodiments of the present application. It should be understood that the above descriptions are only specific implementations of the embodiments of the present application, and are not intended to be used for The protection scope of the embodiments of the present application is limited, and any modifications, equivalent replacements, improvements, etc. made on the basis of the technical solutions of the embodiments of the present application should be included within the protection scope of the embodiments of the present application.

Claims (10)

  1. 一种纹波电流控制方法，其特征在于，所述方法包括：A ripple current control method, characterized in that the method comprises:
    采集输出电流，所述输出电流为双向谐振直流变换电路的输出电流，所述双向谐振变换电路与功率因数校正电路连接，所述功率因数校正电路的输出电流是所述双向谐振变换电路的输入电流；Collect the output current, the output current is the output current of the bidirectional resonant DC conversion circuit, the bidirectional resonance conversion circuit is connected with the power factor correction circuit, and the output current of the power factor correction circuit is the input current of the bidirectional resonance conversion circuit ;
    确定所述输出电流携带的纹波电流的值，所述纹波电流会引起所述输出电流幅值的变化，影响所述输出电流的稳定性；determining the value of the ripple current carried by the output current, the ripple current will cause a change in the amplitude of the output current and affect the stability of the output current;
    根据所述纹波电流的值，通过脉冲宽度调制，调整所述功率因数校正电路的输出电压。According to the value of the ripple current, the output voltage of the power factor correction circuit is adjusted through pulse width modulation.
  2. 根据权利要求1所述的纹波电流控制方法，其特征在于，所述确定所述输出电流携带的纹波电流的值包括：The ripple current control method according to claim 1, wherein the determining the value of the ripple current carried by the output current comprises:
    确定所述输出电流携带的所述纹波电流的峰峰值，其中，所述峰峰值为输出电流最大值与最小值的差值。The peak-to-peak value of the ripple current carried by the output current is determined, wherein the peak-to-peak value is the difference between the maximum value and the minimum value of the output current.
  3. 根据权利要求2所述的纹波电流控制方法，其特征在于，在所述确定所述输出电流携带的纹波电流的值之后，还包括：The ripple current control method according to claim 2, wherein after the determining the value of the ripple current carried by the output current, the method further comprises:
    判断所述纹波电流的值是否超过所述纹波电流的阈值；Determine whether the value of the ripple current exceeds the threshold value of the ripple current;
    若判断为是，根据所述纹波电流的值，调整所述功率因数校正电路的输出电压；If it is determined to be yes, adjust the output voltage of the power factor correction circuit according to the value of the ripple current;
    若判断为否，维持所述功率因数校正电路的输出电压不变。If the judgment is negative, the output voltage of the power factor correction circuit is maintained unchanged.
  4. 根据权利要求3所述的纹波电流控制方法，其特征在于，所述通过脉冲宽度调制，调整所述功率因数校正电路的输出电压包括：The ripple current control method according to claim 3, wherein the adjusting the output voltage of the power factor correction circuit by pulse width modulation comprises:
    通过脉冲宽度调制，从高往低调整所述功率因数校正电路的输出电压，直到所述纹波电流的值小于所述阈值，或者；Adjust the output voltage of the power factor correction circuit from high to low through pulse width modulation until the value of the ripple current is less than the threshold, or;
    通过脉冲宽度调制，从低往高调整所述功率因数校正电路的输出电压，直到所述纹波电流的值小于所述阈值。Through pulse width modulation, the output voltage of the power factor correction circuit is adjusted from low to high until the value of the ripple current is less than the threshold value.
  5. 根据权利要求4所述的纹波电流控制方法，其特征在于，所述方法还包括：The ripple current control method according to claim 4, wherein the method further comprises:
    在通过脉冲宽度调制，从高往低调整所述功率因数校正电路的输出电压后；或者，在通过脉冲宽度调制，从低往高调整所述功率因数校正电路的输出电压后，将所述纹波电流的最小值对应的所述功率因数校正电路的电压作为所述功率因数校正电路的输出电压。After the output voltage of the power factor correction circuit is adjusted from high to low through pulse width modulation; or, after the output voltage of the power factor correction circuit is adjusted from low to high through pulse width modulation, the ripple The voltage of the power factor correction circuit corresponding to the minimum value of the wave current is used as the output voltage of the power factor correction circuit.
  6. 一种纹波电流控制***，其特征在于，所述纹波电流控制***包括：采样模块，计算模块以及控制模块：A ripple current control system, characterized in that the ripple current control system comprises: a sampling module, a calculation module and a control module:
    所述采样模块用于采集输出电流，所述输出电流为双向谐振变换电路的输出电流，所述双向谐振变换电路与功率因数校正电路连接，所述功率因数校正电路的输出电流是所述双向谐振变换电路的输入电流；The sampling module is used to collect the output current, the output current is the output current of the bidirectional resonance conversion circuit, the bidirectional resonance conversion circuit is connected with the power factor correction circuit, and the output current of the power factor correction circuit is the bidirectional resonance conversion circuit. The input current of the conversion circuit;
    所述计算模块用于确定输出电流携带的所述纹波电流的大小；The calculation module is used to determine the magnitude of the ripple current carried by the output current;
    所述控制模块用于根据所述纹波电流的值，通过脉冲宽度调制，调整所述功率因数校正电路的输出电压。The control module is configured to adjust the output voltage of the power factor correction circuit through pulse width modulation according to the value of the ripple current.
  7. 根据权利要求6所述纹波电流控制***，其特征在于，所述纹波电流控制***还包括判断模块：The ripple current control system according to claim 6, wherein the ripple current control system further comprises a judgment module:
    所述判断模块用于判断所述纹波电流的大小是否超过所述纹波电流的阈值；若判断为是，根据所述纹波电流的值，调整所述功率因数校正电路的输出电压；若判断为否，维持所述功率因数校正电路的输出电压不变。The judging module is used to judge whether the magnitude of the ripple current exceeds the threshold value of the ripple current; if the judgment is yes, adjust the output voltage of the power factor correction circuit according to the value of the ripple current; If the determination is no, the output voltage of the power factor correction circuit is maintained unchanged.
  8. 一种纹波电流控制电路，其特征在于，所述纹波电流控制电路执行如权利要求1-5任一项所述的方法。A ripple current control circuit, characterized in that, the ripple current control circuit executes the method according to any one of claims 1-5.
  9. 一种充电装置，其特征在于，所述充电装置包括纹波电流控制电路，所述纹波电流控制电路执行如权利要求1-5任一项所述的方法。A charging device, characterized in that the charging device includes a ripple current control circuit, and the ripple current control circuit executes the method according to any one of claims 1-5.
  10. 一种车辆，其特征在于，所述车辆包括充电装置，所述充电装置执行如权利要求1-5任一项所述的方法。A vehicle, characterized in that the vehicle includes a charging device, and the charging device executes the method according to any one of claims 1-5.
PCT/CN2021/075880 2021-02-07 2021-02-07 Ripple current control method and system, and device WO2022165815A1 (en)

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