CN117507914B - Charging pile charging module and current equalizing method - Google Patents

Charging pile charging module and current equalizing method Download PDF

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Publication number
CN117507914B
CN117507914B CN202410018662.5A CN202410018662A CN117507914B CN 117507914 B CN117507914 B CN 117507914B CN 202410018662 A CN202410018662 A CN 202410018662A CN 117507914 B CN117507914 B CN 117507914B
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China
Prior art keywords
resistor
electrically connected
charging
output
current
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CN202410018662.5A
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Chinese (zh)
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CN117507914A (en
Inventor
刘刚
丁仲能
李世才
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Guangdong Dingwang Technology Co ltd
Yunnan Dingwang Technology Co ltd
Shenzhen Dingwang Technology Co ltd
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Guangdong Dingwang Technology Co ltd
Yunnan Dingwang Technology Co ltd
Shenzhen Dingwang Technology Co ltd
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Priority to CN202410018662.5A priority Critical patent/CN117507914B/en
Publication of CN117507914A publication Critical patent/CN117507914A/en
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    • 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
    • B60L53/60—Monitoring or controlling charging stations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/30—Constructional details of charging stations
    • B60L53/31—Charging columns specially adapted for electric vehicles
    • 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
    • B60L53/60—Monitoring or controlling charging stations
    • B60L53/62—Monitoring or controlling charging stations in response to charging parameters, e.g. current, voltage or electrical charge
    • 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
    • H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • H02J7/0014—Circuits for equalisation of charge between batteries
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • 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
    • H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/12—Electric charging stations

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The application relates to a charging pile charging module and a current sharing method. The charging pile charging module comprises a control circuit, a power circuit and an equalization control circuit; the control circuit is respectively and electrically connected with the power circuit and the balance control circuit; the power circuit is electrically connected with the balance control circuit; the equalization control circuit synthesizes a modulation signal according to the acquired output voltage and output current of the power circuit and transmits the modulation signal to the control circuit; the control circuit controls the power circuit to adjust the current output voltage and current according to the modulation signal and the acquired standard voltage and standard current. According to the power supply module, the power circuit is enabled to adjust the current output voltage and current according to the modulation signal and the acquired standard voltage and standard current, so that balanced and stable output of the power supply module is ensured, and the problem that the output currents of the power supply modules are inconsistent when a plurality of power supply modules are used in parallel can be avoided.

Description

Charging pile charging module and current equalizing method
Technical Field
The application relates to the technical field of charging piles, in particular to a charging pile charging module and a current sharing method.
Background
With the continuous development of new energy automobiles and the continuous progress of charging technologies, charging piles have been developed to higher charging voltages and greater charging powers, for example, existing charging piles can provide 120KW of power output. However, because the power that single power module can provide is 20KW or 30KW generally, so high-power fills electric pile and adopts the strategy that parallel use power module expands, and a plurality of power modules carry out parallel output.
However, since the voltage output from each power module to the load cannot be completely uniform, the output impedance characteristics are also different. Simply connecting the power modules in parallel cannot ensure that the output currents of the power modules are completely consistent, and the condition that the existing power modules work under full load and the existing power modules run under no load is likely to occur. The power supply module runs in no-load and full-load modes, which are not in the optimal running state, and the overall service life of the charging pile can be influenced.
Disclosure of Invention
Based on the above, it is necessary to provide a charging pile charging module and a current equalizing method for solving the problem that the output currents of the power supply modules in the conventional series connection cannot be guaranteed to be completely consistent.
In order to achieve the above object, in one aspect, an embodiment of the present application provides a charging pile charging module, including a control circuit, a power circuit, and an equalization control circuit; the control circuit is respectively and electrically connected with the power circuit and the balance control circuit; the power circuit is electrically connected with the balance control circuit;
the equalization control circuit synthesizes a modulation signal according to the acquired output voltage and output current of the power circuit and transmits the modulation signal to the control circuit; the control circuit controls the power circuit to adjust the current output voltage and current according to the modulation signal and the acquired standard voltage and standard current.
In one embodiment, the equalization control circuit includes a current amplifying circuit, a voltage follower circuit, and an error amplifying circuit;
The acquisition end of the current amplifying circuit is electrically connected with the output end of the power circuit, and the output end of the current amplifying circuit is electrically connected with the input end of the error amplifying circuit; the acquisition end of the voltage follower circuit is electrically connected with the output end of the power circuit, and the output end of the voltage follower circuit is electrically connected with the input end of the error amplifying circuit; the output end of the error amplifying circuit is electrically connected with the input end of the control circuit.
In one embodiment, the current amplifying circuit includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a capacitor C1, and a first amplifier;
the resistor R1 is connected in series with the output end of the power circuit, the first end of the resistor R2 is electrically connected with the first end of the resistor R1, and the second end of the resistor R2 is electrically connected with the non-inverting end of the first amplifier; the first end of the resistor R3 is electrically connected with the second end of the resistor R1, and the second end is electrically connected with the inverting end of the first amplifier; the first end of the resistor R4 is electrically connected with the inverting end of the first amplifier, and the second end of the resistor R4 is electrically connected with the output end of the first amplifier; the first end of the capacitor C1 is electrically connected with the inverting end of the first amplifier, and the second end of the capacitor C1 is electrically connected with the output end of the first amplifier; the output end of the first amplifier is electrically connected with the input end of the error amplifying circuit.
In one embodiment, the voltage follower circuit includes a resistor R5, a resistor R6, a resistor R7, and a second amplifier;
The first end of the resistor R5 is electrically connected with the output end of the power circuit, and the second end of the resistor R5 is electrically connected with the first end of the resistor R6 and the first end of the resistor R7 respectively; the second end of the resistor R6 is electrically connected with the non-inverting end of the second amplifier; the second end of the resistor R7 is grounded; the inverting terminal of the second amplifier is electrically connected with the output terminal of the second amplifier; the output end of the second amplifier is electrically connected with the input end of the error amplifying circuit.
In one embodiment, the error amplifying circuit includes a resistor R8, a resistor R9, a resistor R10, a resistor R11, a capacitor C2, a capacitor C3, and a third amplifier;
The first end of the resistor R8 is electrically connected with the output end of the first amplifier, and the second end of the resistor R8 is electrically connected with the positive phase end of the third amplifier; the first end of the resistor R9 is electrically connected with the output end of the second amplifier, and the second end of the resistor R9 is electrically connected with the positive phase end of the third amplifier; the first end of the resistor R10 is respectively and electrically connected with the second end of the resistor R9 and the first end of the capacitor C2, and the second end is grounded; the second end of the capacitor C2 is grounded; the first end of the resistor R11 is electrically connected with the inverting end of the third amplifier, and the second end of the resistor R11 is electrically connected with the output end of the third amplifier; the first end of the capacitor C3 is electrically connected with the inverting end of the third amplifier, and the second end of the capacitor C3 is electrically connected with the output end of the third amplifier; the output end of the third amplifier is electrically connected with the input end of the control circuit, and the inverting end of the third amplifier inputs the first reference voltage.
In one embodiment, the equalization control circuit generates an overvoltage signal according to the acquired output voltage of the power circuit and transmits the overvoltage signal to the control circuit; the control circuit controls the power circuit to stop working according to the overvoltage signal.
In one embodiment, the equalization control circuit further comprises an over-voltage comparison circuit; the acquisition end of the overvoltage comparison circuit is electrically connected with the output end of the power circuit, and the output end is electrically connected with the input end of the control circuit;
the overvoltage comparison circuit comprises a resistor R12, a resistor R13, a resistor R14, a resistor R15, a resistor R16, a capacitor C4, a capacitor C5 and a fourth amplifier;
The first end of the resistor R12 is electrically connected with the output end of the power circuit, and the second end of the resistor R12 is electrically connected with the positive phase end of the fourth amplifier and the first end of the resistor R13 respectively; the second end of the resistor R13 is grounded; the first end of the resistor R14 is electrically connected with the positive phase end of the fourth amplifier, and the second end of the resistor R14 is electrically connected with the output end of the fourth amplifier; the first end of the capacitor C4 is electrically connected with the positive phase end of the fourth amplifier, and the second end of the capacitor C4 is electrically connected with the output end of the fourth amplifier; the inverting terminal of the fourth amplifier is connected with a second reference voltage;
The first end of the resistor R15 is electrically connected with the output end of the fourth amplifier, and the second end of the resistor R15 is electrically connected with the first end of the resistor R16, the first end of the capacitor C5 and the input end of the control circuit respectively; a second terminal of resistor R16 and a second terminal of capacitor C5 are grounded.
On the other hand, the application provides a current sharing method, which is applied to a charging pile, wherein the charging pile comprises a charging control device, a switch control device, N DC-split contactors, 1 total DC contactor and N charging pile charging modules;
the charging control device is electrically connected with the switch control device; the switch control device is respectively and electrically connected with the split direct current contactor and the total direct current contactor; the charging pile charging module is connected to the input end of the total direct current contactor through a corresponding direct current separating contactor; the charging control device is electrically connected with the input end of the total direct current contactor; the charging control device is respectively connected with the charging pile charging module in a communication way; the charging pile charging module is used for accessing an alternating current power grid; the output end of the total direct current contactor is used for connecting electric equipment through a charging gun;
The flow equalizing method comprises the following steps:
The charging control device obtains rated power and output voltage range of a charging pile charging module and electricity demand of electric equipment;
The charging control device distributes the number of charging pile charging modules required by meeting the power consumption requirement according to the rated power, the output voltage range and the power consumption requirement, calculates standard voltage and standard current for the distributed charging pile charging modules according to the rated power, the output voltage range and the power consumption requirement, and sends the standard voltage and the standard current to the corresponding charging pile charging modules;
The charging control device controls the corresponding DC-separating contactor of the allocated charging pile charging module to be closed through the switch control device, the allocated charging pile charging module discharges based on the corresponding standard voltage and standard current, and the allocated charging pile charging module feeds back the output voltage and the output current to the charging control device;
and the charging control device acquires the total voltage at the input end of the total direct current contactor, and if the total voltage is smaller than or equal to the voltage in the electricity demand, the switching control device controls the total direct current contactor to be closed so as to supply power to the electric equipment.
In one embodiment, the method further comprises the steps of: the charging control device updates the standard voltage and the standard current according to the output voltage and the output current fed back by the allocated charging pile charging module;
the charging control device updates the standard voltage and the standard current according to the output voltage and the output current fed back by the allocated charging pile charging module, and the charging control device comprises:
When the difference value between the output current and the standard current is smaller than-0.2 ampere, the charging control device increases the standard voltage according to a first preset amount, and sends the increased standard voltage down to the corresponding allocated charging pile charging module;
When the difference value between the output current and the standard current is larger than 0.2 ampere, the charging control device reduces the standard voltage according to a second preset amount and sends the reduced standard voltage down to the corresponding allocated charging pile charging module;
When the difference between the output current and the standard current is within-0.2 ampere and 0.2 ampere, the charging control device does not update the standard voltage.
In one embodiment, the method further comprises the steps of: if the number of times that the standard voltage of the charging pile charging module which is allocated is updated is equal to the preset number of times, the charging control device sends the standard voltage with the voltage value of zero to the corresponding charging pile charging module which is allocated, controls the corresponding charging pile charging module which is allocated to stop working, and controls the corresponding DC-DC separating contactor to be disconnected through the switch control device;
The charging control device redistributes one or more charging pile charging modules from the unassigned charging pile charging modules, transmits standard voltage and standard current to the reassigned charging pile charging modules, and controls the corresponding split direct current contactors of the reassigned charging pile charging modules to be closed through the switch control device.
One of the above technical solutions has the following advantages and beneficial effects:
The charging pile charging module provided by the embodiments of the application comprises a control circuit, a power circuit and an equalization control circuit. In the running process, the equalization control circuit synthesizes a modulation signal according to the acquired output voltage and output current of the power circuit, and transmits the modulation signal to the control circuit, and the control circuit controls the power circuit to adjust the current output voltage and output current according to the modulation signal and the acquired standard voltage and standard current. The power module monitors the output voltage and the output current thereof in real time, synthesizes a modulation signal according to the output voltage and the output current, and then enables the power circuit to adjust the current output voltage and the current output current according to the modulation signal and the acquired standard voltage and standard current so as to ensure balanced and stable output of the power module, thereby avoiding the problem that the output currents of the power module are inconsistent when a plurality of power modules are used in parallel, avoiding the condition of no-load or full-load operation of the power module and prolonging the service life of the power module.
Drawings
Fig. 1 is a schematic structural diagram of a charging pile charging module according to an embodiment of the present application.
Fig. 2 is a schematic structural diagram of an equalization control circuit according to an embodiment of the present application.
Fig. 3 is a circuit diagram of an equalization control circuit according to an embodiment of the present application.
Fig. 4 is a schematic diagram of another structure of an equalization control circuit according to an embodiment of the present application.
Fig. 5 is another circuit diagram of the equalization control circuit provided by the embodiment of the present application.
Fig. 6 is a circuit diagram of an equalization control circuit according to an embodiment of the present application.
Fig. 7 is a schematic structural diagram of a charging pile according to an embodiment of the present application.
Fig. 8 is a flow chart of a current sharing method according to the embodiment of the present application.
Detailed Description
In order that the application may be readily understood, a more complete description of the application will be rendered by reference to the appended drawings. Preferred embodiments of the present application are shown in the drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "electrically connected" to another element, it can be directly electrically connected to and integrated with the other element or intervening elements may also be present. The terms "mounted," "one end," "the other end," and the like are used herein for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
For a plurality of power modules used in parallel, at present, a general output balancing scheme mainly comprises a master-slave machine setting method and a maximum current method. Wherein, the master-slave setting method comprises the following steps: one of the power supply modules connected in parallel is set as a master module, the other power supply modules are slave modules, and the slave modules adjust the current of the slave modules by taking the current of the master module as a reference to realize the purpose of current sharing. Maximum current method: the method comprises the steps of selecting the module with the largest output current among a plurality of parallel power supply modules as a main module, and adjusting the output current of the rest power supply modules to approach the main module so as to realize the purpose of current sharing.
In order to achieve balanced output of a plurality of parallel power modules, in one embodiment, as shown in fig. 1, an embodiment of the present application provides a charging pile charging module 1, which includes a control circuit 11, a power circuit 13, and an equalization control circuit 15. Wherein the control circuit 11 is electrically connected with the power circuit 13 and the equalization control circuit 15 respectively; the power circuit 13 is electrically connected to the equalization control circuit 15. The control circuit 11 is a control center of the power module, and is used to control the operation of the power module, for example, in this embodiment, the control circuit 11 controls the equalization control circuit 15. In one example, the control circuit 11 is a microprocessor, a system on a chip, or a single chip microcomputer, or the like. The power circuit 13 is configured to convert ac power obtained from an ac power grid into dc power for charging electrical equipment, including but not limited to: electric cars, electric buses, electric ships, etc. The equalization control circuit 15 is configured to collect an output voltage and an output current of the power circuit 13, and synthesize a modulation signal according to the output voltage and the output current, where the equalization control circuit 15 transmits the modulation signal to the control circuit 11, and the control circuit 11 controls the power circuit 13 based on the modulation signal.
During the operation of the power supply module, the equalization control circuit 15 synthesizes a modulation signal according to the acquired output voltage and output current of the power circuit 13, and transmits the modulation signal to the control circuit 11; the control circuit 11 controls the power circuit 13 to adjust the present output voltage and output current based on the modulation signal and the acquired standard voltage and standard current. The standard voltage and the standard current may be configured in the control circuit 11 in advance, or may be temporarily transmitted to the control circuit 11 through an external device or apparatus. The standard voltage and the standard current can be fixed values or non-fixed values which are updated according to the actual running condition of the power supply module. The power circuit 13 is controlled to regulate the present output voltage and output current based on the modulation signal, the standard voltage, and the standard current, so that the output voltage of the power circuit 13 is within a range of a number set centered on the standard voltage and centered on the first value and the output current is within a range of a number set centered on the standard current and centered on the second value. The smaller the first numerical value and the second numerical value are, the higher the control precision is, and the balanced output of a plurality of parallel power modules is facilitated, so that the stability of the system is improved, and the service life of the system is prolonged.
The implementation of the equalization control circuit 15 is various, and in one example, as shown in fig. 2, the equalization control circuit 15 includes a current amplification circuit 151, a voltage follower circuit 153, and an error amplification circuit 155; the acquisition end of the current amplifying circuit 151 is electrically connected with the output end of the power circuit 13, and the output end is electrically connected with the input end of the error amplifying circuit 155; the acquisition end of the voltage follower circuit 153 is electrically connected with the output end of the power circuit 13, and the output end is electrically connected with the input end of the error amplifying circuit 155; the output of the error amplifying circuit 155 is electrically connected to the input of the control circuit 11.
The current amplifying circuit 151 is variously implemented, and in one example, as shown in fig. 3, the current amplifying circuit 151 includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a capacitor C1, and a first amplifier U1; the resistor R1 is connected in series with the output end of the power circuit 13, the first end of the resistor R2 is electrically connected with the first end of the resistor R1, and the second end of the resistor R2 is electrically connected with the non-inverting end of the first amplifier U1; the first end of the resistor R3 is electrically connected with the second end of the resistor R1, and the second end is electrically connected with the inverting end of the first amplifier U1; the first end of the resistor R4 is electrically connected with the inverting end of the first amplifier U1, and the second end of the resistor R4 is electrically connected with the output end of the first amplifier U1; the first end of the capacitor C1 is electrically connected with the inverting end of the first amplifier U1, and the second end of the capacitor C1 is electrically connected with the output end of the first amplifier U1; the output of the first amplifier U1 is electrically connected to the input of the error amplifying circuit 155.
The implementation of the voltage follower circuit 153 is various, and in one example, as shown in fig. 3, the voltage follower circuit 153 includes a resistor R5, a resistor R6, a resistor R7, and a second amplifier U2; the first end of the resistor R5 is electrically connected with the output end of the power circuit 13, and the second end of the resistor R5 is electrically connected with the first end of the resistor R6 and the first end of the resistor R7 respectively; the second end of the resistor R6 is electrically connected with the non-inverting end of the second amplifier U2; the second end of the resistor R7 is grounded; the inverting terminal of the second amplifier U2 is electrically connected with the output terminal of the second amplifier U2; the output of the second amplifier U2 is electrically connected to the input of the error amplifying circuit 155.
The implementation of the error amplification circuit 155 is various, and in one example, as shown in fig. 3, the error amplification circuit 155 includes a resistor R8, a resistor R9, a resistor R10, a resistor R11, a capacitor C2, a capacitor C3, and a third amplifier U3; the first end of the resistor R8 is electrically connected with the output end of the first amplifier U1, and the second end of the resistor R8 is electrically connected with the non-inverting end of the third amplifier U3; the first end of the resistor R9 is electrically connected with the output end of the second amplifier U2, and the second end of the resistor R9 is electrically connected with the non-inverting end of the third amplifier U3; the first end of the resistor R10 is respectively and electrically connected with the second end of the resistor R9 and the first end of the capacitor C2, and the second end is grounded; the second end of the capacitor C2 is grounded; the first end of the resistor R11 is electrically connected with the inverting end of the third amplifier U3, and the second end of the resistor R11 is electrically connected with the output end of the third amplifier U3; the first end of the capacitor C3 is electrically connected with the inverting end of the third amplifier U3, and the second end of the capacitor C3 is electrically connected with the output end of the third amplifier U3; the output terminal of the third amplifier U3 is electrically connected to the input terminal of the control circuit 11, and the inverting terminal of the third amplifier U3 inputs the first reference voltage, as shown in fig. 3 and 5, VREF1 represents the first reference voltage.
The operation principle of the current amplification circuit 151, the voltage follower circuit 153, and the error amplification circuit 155 is as follows:
The current amplifying circuit 151 collects the output current of the power circuit 13 through the resistor R1 (In represents the output current as shown In fig. 3,5 and 6), and the output current is amplified by the first amplifier U1 to obtain the sampling signal IF. The voltage follower circuit 153 obtains an output voltage (Vn denotes an output voltage as shown in fig. 3,5 and 6), divides the output voltage through the resistor R5 and the resistor R6, and divides the output voltage into a sampling signal VF obtained through the second amplifier U2. The signal IF and the signal VF are combined into a feedback signal, and the feedback signal and the first reference voltage are transmitted to the third amplifier U3, and then a modulated signal VC is obtained after the feedback signal and the first reference voltage pass through the third amplifier U3 and is output to the control circuit 11, and the control circuit 11 controls the power circuit 13 to adjust the output current according to the change of the value of the modulated signal VC (specifically, adjusts the output current by adjusting the output voltage). The increase of the output current In causes an increase of the sampling signal IF, the increase of the sampling signal IF, and the decrease of the output modulation signal VC, the control circuit 11 controls the power circuit 13 to decrease the output current In such that the output voltage Vn of the power circuit 13 is located within a range of a number set with a radius of a first value centered on the standard voltage, and the output current In is located within a range of a number set with a radius of a second value centered on the standard current.
In order to improve the safety performance of the power module. In one example, the equalization control circuit 15 generates an overvoltage signal from the collected output voltage of the power circuit 13 and transmits the overvoltage signal to the control circuit 11; the control circuit 11 controls the power circuit 13 to stop working according to the overvoltage signal. When the output voltage of the power circuit 13 exceeds the rated voltage of the power circuit 13, the equalization control circuit 15 generates an overvoltage signal.
The implementation of the overvoltage comparing circuit 157 is various, and as shown in fig. 4, the equalization control circuit 15 further includes the overvoltage comparing circuit 157. As shown in fig. 5, the collection end of the overvoltage comparing circuit 157 is electrically connected with the output end of the power circuit 13, and the output end is electrically connected with the input end of the control circuit 11; the overvoltage comparing circuit 157 includes a resistor R12, a resistor R13, a resistor R14, a resistor R15, a resistor R16, a capacitor C4, a capacitor C5, and a fourth amplifier U4; the first end of the resistor R12 is electrically connected with the output end of the power circuit 13, and the second end of the resistor R12 is electrically connected with the positive end of the fourth amplifier U4 and the first end of the resistor R13 respectively; the second end of the resistor R13 is grounded; the first end of the resistor R14 is electrically connected with the positive phase end of the fourth amplifier U4, and the second end of the resistor R14 is electrically connected with the output end of the fourth amplifier U4; the first end of the capacitor C4 is electrically connected with the positive phase end of the fourth amplifier U4, and the second end of the capacitor C4 is electrically connected with the output end of the fourth amplifier U4; the inverting terminal of the fourth amplifier U4 is connected to the second reference voltage (VREF 2 represents the second reference voltage as shown in fig. 5); the first end of the resistor R15 is electrically connected with the output end of the fourth amplifier U4, and the second end of the resistor R16 is electrically connected with the first end of the capacitor C5 and the input end of the control circuit 11 respectively; a second terminal of resistor R16 and a second terminal of capacitor C5 are grounded.
In one example, as shown in fig. 6, the resistor R5 in the voltage follower circuit 153 and the resistor R12 in the overvoltage comparing circuit 157 may share one resistor, that is, the resistor R5 in the voltage follower circuit 153 and the resistor R12 in the overvoltage comparing circuit 157 are the same resistor. The resistor R7 in the voltage follower circuit 153 and the resistor R13 in the overvoltage comparator circuit 157 may share one resistor, that is, the resistor R7 in the voltage follower circuit 153 and the resistor R13 in the overvoltage comparator circuit 157 are the same resistor.
The operating principle of the overvoltage comparator circuit 157 is as follows:
The overvoltage comparing circuit 157 obtains the voltage division of the output voltage Vn of the power circuit 13 through the resistor R12, the voltage division is compared with the second reference voltage, the voltage division is output to the control end through the comparator U1, when the output voltage of the power circuit 13 exceeds the rated voltage, the control circuit 11 receives the overvoltage signal to stop the work of the power circuit 13 module in time, and the circuit is protected.
The charging pile charging module provided by the embodiments of the application comprises a control circuit, a power circuit and an equalization control circuit. In the running process, the equalization control circuit synthesizes a modulation signal according to the acquired output voltage and output current of the power circuit, and transmits the modulation signal to the control circuit, and the control circuit controls the power circuit to adjust the current output voltage and output current according to the modulation signal and the acquired standard voltage and standard current. The power module monitors the output voltage and the output current thereof in real time, synthesizes a modulation signal according to the output voltage and the output current, and then enables the power circuit to adjust the current output voltage and the current output current according to the modulation signal and the acquired standard voltage and standard current so as to ensure balanced and stable output of the power module, thereby avoiding the problem that the output currents of the power module are inconsistent when a plurality of power modules are used in parallel, avoiding the condition of no-load or full-load operation of the power module and prolonging the service life of the power module.
In one embodiment, a current sharing method is provided, and the current sharing method is applied to a charging pile. As shown in fig. 7, the charging pile includes a charging control device 2, a switch control device 3, N dc-dc separating contactors 6, 1 total dc contactor 7, and N charging pile charging modules 1 described above. The charging control device 2 is used for obtaining the electricity consumption requirement of the electric equipment 4 through communication with the electric equipment 4, distributing a power module for the electric equipment 4, controlling the combined output, and regulating the balanced output of the charging pile charging module 1. In one example, the charge control device 2 is a microprocessor, a system on a chip, or a single chip microcomputer, or the like. The switch control device 3 is used for receiving instructions of the charging control device 2 to control the opening and closing of the split direct current contactor 6 and the total direct current contactor 7.
The charging control device 2 is electrically connected with the switch control device 3; the switch control device 3 is respectively and electrically connected with the split direct current contactor 6 and the total direct current contactor 7; the charging pile charging module 1 is connected to the input end of the total direct current contactor 7 through a corresponding one of the direct current separating contactors 6; the charging control device 2 is electrically connected with the input end of the total direct current contactor 7; the charging control device 2 is respectively connected with the charging pile charging module 1 in a communication way; the charging pile charging module 1 is used for accessing an alternating current power grid 5; the output of the total dc contactor 7 is used to connect to the consumer 4 via a charging gun. Wherein, realize the communication connection through CAN (Controller AreaNetwork, controller area network bus) bus. Specifically, the dc-split contactor 6 is connected to the second end of the resistor R1 of the equalization control circuit.
As shown in fig. 8, the current sharing method includes the steps of:
In step S810, the charging control device 2 obtains the rated power and the output voltage range of the charging pile charging module 1, and obtains the power consumption requirement of the electric equipment 4. In one example, the charging control device 2 is in communication connection with the power supply module via the CAN bus, after which the power supply module actively reports the output voltage range and the rated power to the charging control device 2. The charging control device 2 is in communication connection with the electric equipment 4 through the CAN bus, electricity consumption requirements of the electric equipment 4 are obtained, the charging requirements comprise charging voltage, charging current and charging power, and specifically, the charging control device 2 CAN communicate with the electric equipment 4 through the CAN bus on the charging gun.
In step S820, the charging control device 2 allocates the number of charging pile charging modules 1 required to meet the power demand according to the rated power, the output voltage range and the power demand, calculates the standard voltage and the standard current for the allocated charging pile charging modules 1 according to the rated power, the output voltage range and the power demand, and sends the standard voltage and the standard current to the corresponding charging pile charging modules 1. For example, assuming that the charging power in the electricity demand is 120KW and the rated power of the charging pile charging module 1 is 30KW, 4 charging pile charging modules 1 need to be allocated to the electric device 4, and after the charging pile charging modules 1 are allocated, the standard voltage and the standard current are calculated according to the rated power, the output voltage range and the electricity demand. After the standard voltage and standard current are calculated, they are sent down to the assigned charging pile charging module 1 via the CAN bus. Of course, the rated power of the charging pile charging module 1 may be the same or different. When the charging pile charging modules 1 are distributed, the sum of the output power of the distributed charging pile charging modules 1 is ensured to be equal to the charging power.
In step S830, the charging control device 2 controls the dc-dc dividing contactor 6 corresponding to the allocated charging pile charging module 1 to be closed through the switch control device 3, the allocated charging pile charging module 1 discharges based on the corresponding standard voltage and standard current, and the allocated charging pile charging module 1 feeds back the output voltage and output current to the charging control device 2. After the charging pile charging modules 1 are distributed, the charging control device 2 sends a control instruction to the switch control device 3 to control the corresponding split direct current contactor 6 to be closed, and the electric energy of the distributed charging pile charging modules 1 is converged on the total direct current contactor 7. At the same time, the allocated charging pile charging module 1 reports the actual output current and output voltage to the charging control device 2 via the CAN bus, so that the charging control device 2 monitors the output voltage and output current of the charging pile charging module 1.
In step S840, the charging control device 2 obtains the total voltage at the input end of the total dc contactor 7, and if the total voltage is less than or equal to the voltage in the electricity demand, the total dc contactor 7 is controlled to be closed by the switch control device 3 so as to supply power to the electric equipment 4. The electric equipment 4 is prevented from being damaged due to overlarge output voltage, the total voltage after the total voltage is detected, and the total direct current contactor 7 is controlled to be closed only when the total voltage is smaller than or equal to the voltage in the electricity demand, so that the charging safety performance of the electric equipment 4 is improved.
In order to further balance the output of the charging pile charging module 1, the current sharing method further comprises the following steps: the charging control device 2 updates the standard voltage and the standard current according to the output voltage and the output current fed back by the allocated charging pile charging module 1. For example, when the output current of one charging pile charging module 1 is low and imbalance occurs, the output current of the charging pile charging module 1 is raised so that each charging pile charging module 1 outputs in an equalizing manner. For example, when the output current of the charging pile charging module 1 is high and imbalance occurs, the output current of the charging pile charging module 1 is reduced so that each charging pile charging module 1 outputs in an equalizing manner. Specifically, the output current may be adjusted by changing the output voltage of the charging pile charging module 1, i.e., the output voltage of the power circuit of the charging pile charging module 1.
The charging control device 2 updates the standard voltage and the standard current according to the output voltage and the output current fed back by the allocated charging pile charging module 1, and comprises:
When the difference between the output current and the standard current is smaller than-0.2 ampere, the charging control device 2 increases the standard voltage according to a first preset amount, and sends the increased standard voltage down to the corresponding allocated charging pile charging module; when the difference between the output current and the standard current is greater than 0.2 ampere, the charging control device 2 reduces the standard voltage according to a second preset amount and sends the reduced standard voltage down to the corresponding allocated charging pile charging module; when the difference between the output current and the standard current is within-0.2 ampere and 0.2 ampere, the charging control device 2 does not update the standard voltage. It should be noted that the first preset amount may be, but is not limited to, 0.05 v, 0.1 v, or 0.2 v. The second predetermined amount may be, but is not limited to, 0.05 volts, 0.1 volts, or 0.2 volts.
The output current and the output voltage of the unbalanced charging pile charging module 1 are updated, so that the output current of the unbalanced charging pile charging module 1 is close to the output current of other charging pile charging modules 1 to be the same, the charging pile charging modules 1 are balanced with each other, no-load or overload operation of the individual charging pile charging modules 1 is avoided, the service life of a charging pile is prolonged, and meanwhile the charging efficiency of the electric equipment 4 is improved.
In order to ensure that equalization can be realized among the charging pile charging modules 1, the method further comprises the step of replacing the charging pile charging modules 1, replacing the charging pile charging modules 1 which are updated for a plurality of times and still cannot be equalized in standard voltage and standard current, and performing equalization output through the replaced charging pile charging modules 1. The flow equalizing method further comprises the steps of: if the number of times that the standard voltage of the allocated charging pile charging module is updated is equal to the preset number of times, the charging control device 2 issues the standard voltage with the voltage value of zero to the corresponding allocated charging pile charging module, controls the corresponding allocated charging pile charging module to stop working, and controls the corresponding DC-DC separating contactor to be disconnected through the switch control device 3; the charging control device 2 redistributes one or more charging pile charging modules from the unassigned charging pile charging modules, and transmits standard voltage and standard current to the reassigned charging pile charging modules, and the switch control device 3 controls the corresponding split direct current contactors of the reassigned charging pile charging modules to be closed.
After each update, the charging pile charging module 1 discharges according to the updated standard voltage and standard current, and the synchronous charging pile charging module 1 reports the new output voltage and output current to the charging control device 2, so that the charging control device 2 monitors the next round, that is, judges whether the output current of the charging pile charging module 1 is smaller than-0.2 ampere, within-0.2 ampere and 0.2 ampere, or larger than-0.2 ampere. In one example, the preset number of times may be, but is not limited to, 3 times, 4 times, or 5 times.
When the charging pile charging module 1 is reassigned, the remaining charging pile charging modules 1 are matched according to the power shortage (i.e. the rated power of the charging pile charging module 1 to be replaced or the difference between the charging power of the consumer 4 and the actually acquired power). For example, the power shortage is 30KW, and two 15KW charging piles may be used for the charging module 1, respectively.
The current equalizing method disclosed by the application has the advantages that the equalization output is regulated by the automatic equalization of the charging pile charging module and the charge control device, and the current equalizing method specifically comprises the control of the charge control device on the standard voltage and the standard current of the charging pile charging module and the self regulation of the charging pile charging module based on the standard voltage and the standard current, so that the equalization output of the charging pile charging module is ensured, and the accuracy and the reliability of the equalization output are higher. In addition, the charging control device can adjust the power distribution strategy in real time, call the charging pile charging module, and achieve redundancy setting.
The charging pile charging module in the current equalizing method of the application, as shown in fig. 1, comprises a control circuit 11, a power circuit 13 and an equalizing control circuit 15. Wherein the control circuit 11 is electrically connected with the power circuit 13 and the equalization control circuit 15 respectively; the power circuit 13 is electrically connected to the equalization control circuit 15. The control circuit 11 is a control center of the power module, and is used to control the operation of the power module, for example, in this embodiment, the control circuit 11 controls the equalization control circuit 15. In one example, the control circuit 11 is a microprocessor, a system on a chip, or a single chip microcomputer, or the like. The power circuit 13 is configured to convert ac power obtained from an ac power grid into dc power for charging electrical equipment, including but not limited to: electric cars, electric buses, electric ships, etc. The equalization control circuit 15 is configured to collect an output voltage and an output current of the power circuit 13, and synthesize a modulation signal according to the output voltage and the output current, where the equalization control circuit 15 transmits the modulation signal to the control circuit 11, and the control circuit 11 controls the power circuit 13 based on the modulation signal.
During the operation of the power supply module, the equalization control circuit 15 synthesizes a modulation signal according to the acquired output voltage and output current of the power circuit 13, and transmits the modulation signal to the control circuit 11; the control circuit 11 controls the power circuit 13 to adjust the present output voltage and output current based on the modulation signal and the acquired standard voltage and standard current. The standard voltage and the standard current may be configured in the control circuit 11 in advance, or may be temporarily transmitted to the control circuit 11 through an external device or apparatus. The standard voltage and the standard current can be fixed values or non-fixed values which are updated according to the actual running condition of the power supply module. The power circuit 13 is controlled to regulate the present output voltage and output current based on the modulation signal, the standard voltage, and the standard current, so that the output voltage of the power circuit 13 is within a range of a number set centered on the standard voltage and centered on the first value and the output current is within a range of a number set centered on the standard current and centered on the second value. The smaller the first numerical value and the second numerical value are, the higher the control precision is, the more balanced output of a plurality of parallel power modules is facilitated, and the stability and the service life of the charging pile are improved.
The implementation of the equalization control circuit 15 is various, and in one example, as shown in fig. 2, the equalization control circuit 15 includes a current amplification circuit 151, a voltage follower circuit 153, and an error amplification circuit 155; the acquisition end of the current amplifying circuit 151 is electrically connected with the output end of the power circuit 13, and the output end is electrically connected with the input end of the error amplifying circuit 155; the acquisition end of the voltage follower circuit 153 is electrically connected with the output end of the power circuit 13, and the output end is electrically connected with the input end of the error amplifying circuit 155; the output of the error amplifying circuit 155 is electrically connected to the input of the control circuit 11.
The current amplifying circuit 151 is variously implemented, and in one example, as shown in fig. 3, the current amplifying circuit 151 includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a capacitor C1, and a first amplifier U1; the resistor R1 is connected in series with the output end of the power circuit 13, the first end of the resistor R2 is electrically connected with the first end of the resistor R1, and the second end of the resistor R2 is electrically connected with the non-inverting end of the first amplifier U1; the first end of the resistor R3 is electrically connected with the second end of the resistor R1, and the second end is electrically connected with the inverting end of the first amplifier U1; the first end of the resistor R4 is electrically connected with the inverting end of the first amplifier U1, and the second end of the resistor R4 is electrically connected with the output end of the first amplifier U1; the first end of the capacitor C1 is electrically connected with the inverting end of the first amplifier U1, and the second end of the capacitor C1 is electrically connected with the output end of the first amplifier U1; the output of the first amplifier U1 is electrically connected to the input of the error amplifying circuit 155.
The implementation of the voltage follower circuit 153 is various, and in one example, as shown in fig. 3, the voltage follower circuit 153 includes a resistor R5, a resistor R6, a resistor R7, and a second amplifier U2; the first end of the resistor R5 is electrically connected with the output end of the power circuit 13, and the second end of the resistor R5 is electrically connected with the first end of the resistor R6 and the first end of the resistor R7 respectively; the second end of the resistor R6 is electrically connected with the non-inverting end of the second amplifier U2; the second end of the resistor R7 is grounded; the inverting terminal of the second amplifier U2 is electrically connected with the output terminal of the second amplifier U2; the output of the second amplifier U2 is electrically connected to the input of the error amplifying circuit 155.
The implementation of the error amplification circuit 155 is various, and in one example, as shown in fig. 3, the error amplification circuit 155 includes a resistor R8, a resistor R9, a resistor R10, a resistor R11, a capacitor C2, a capacitor C3, and a third amplifier U3; the first end of the resistor R8 is electrically connected with the output end of the first amplifier U1, and the second end of the resistor R8 is electrically connected with the non-inverting end of the third amplifier U3; the first end of the resistor R9 is electrically connected with the output end of the second amplifier U2, and the second end of the resistor R9 is electrically connected with the non-inverting end of the third amplifier U3; the first end of the resistor R10 is respectively and electrically connected with the second end of the resistor R9 and the first end of the capacitor C2, and the second end is grounded; the second end of the capacitor C2 is grounded; the first end of the resistor R11 is electrically connected with the inverting end of the third amplifier U3, and the second end of the resistor R11 is electrically connected with the output end of the third amplifier U3; the first end of the capacitor C3 is electrically connected with the inverting end of the third amplifier U3, and the second end of the capacitor C3 is electrically connected with the output end of the third amplifier U3; the output end of the third amplifier U3 is electrically connected to the input end of the control circuit 11, and the inverting end of the third amplifier U3 inputs the first reference voltage.
The operation principle of the current amplification circuit 151, the voltage follower circuit 153, and the error amplification circuit 155 is as follows:
The current amplifying circuit 151 collects the output current of the power circuit 13 through the resistor R1, and the output current is amplified by the first amplifier U1 to obtain the sampling signal IF. The voltage follower circuit 153 obtains the sampling signal VF obtained by dividing the output voltage by the second amplifier U2 after passing through the resistor R5 and the resistor R6. The signal IF and the signal VF are combined into a feedback signal, and the feedback signal and the first reference voltage are transmitted to the third amplifier U3, and then a modulated signal VC is obtained after the feedback signal and the first reference voltage pass through the third amplifier U3 and is output to the control circuit 11, and the control circuit 11 controls the power circuit 13 to adjust the output current according to the change of the value of the modulated signal VC (specifically, adjusts the output current by adjusting the output voltage). The increase of the output current In causes an increase of the sampling signal IF, the increase of the sampling signal IF, and the decrease of the output modulation signal VC, the control circuit 11 controls the power circuit 13 to decrease the output current In such that the output voltage Vn of the power circuit 13 is located within a range of a number set with a radius of a first value centered on the standard voltage, and the output current In is located within a range of a number set with a radius of a second value centered on the standard current.
In order to improve the safety performance of the power module. In one example, the equalization control circuit 15 generates an overvoltage signal from the collected output voltage of the power circuit 13 and transmits the overvoltage signal to the control circuit 11; the control circuit 11 controls the power circuit 13 to stop working according to the overvoltage signal. When the output voltage of the power circuit 13 exceeds the rated voltage of the power circuit 13, the equalization control circuit 15 generates an overvoltage signal.
The implementation of the overvoltage comparing circuit 157 is various, and as shown in fig. 4, the equalization control circuit 15 further includes the overvoltage comparing circuit 157. As shown in fig. 5, the collection end of the overvoltage comparing circuit 157 is electrically connected with the output end of the power circuit 13, and the output end is electrically connected with the input end of the control circuit 11; the overvoltage comparing circuit 157 includes a resistor R12, a resistor R13, a resistor R14, a resistor R15, a resistor R16, a capacitor C4, a capacitor C5, and a fourth amplifier U4; the first end of the resistor R12 is electrically connected with the output end of the power circuit 13, and the second end of the resistor R12 is electrically connected with the positive end of the fourth amplifier U4 and the first end of the resistor R13 respectively; the second end of the resistor R13 is grounded; the first end of the resistor R14 is electrically connected with the positive phase end of the fourth amplifier U4, and the second end of the resistor R14 is electrically connected with the output end of the fourth amplifier U4; the first end of the capacitor C4 is electrically connected with the positive phase end of the fourth amplifier U4, and the second end of the capacitor C4 is electrically connected with the output end of the fourth amplifier U4; the inverting terminal of the fourth amplifier U4 is connected with a second reference voltage; the first end of the resistor R15 is electrically connected with the output end of the fourth amplifier U4, and the second end of the resistor R16 is electrically connected with the first end of the capacitor C5 and the input end of the control circuit 11 respectively; a second terminal of resistor R16 and a second terminal of capacitor C5 are grounded.
In one example, as shown in fig. 6, the resistor R5 in the voltage follower circuit 153 and the resistor R12 in the overvoltage comparing circuit 157 may share one resistor, that is, the resistor R5 in the voltage follower circuit 153 and the resistor R12 in the overvoltage comparing circuit 157 are the same resistor. The resistor R7 in the voltage follower circuit 153 and the resistor R13 in the overvoltage comparator circuit 157 may share one resistor, that is, the resistor R7 in the voltage follower circuit 153 and the resistor R13 in the overvoltage comparator circuit 157 are the same resistor.
The operating principle of the overvoltage comparator circuit 157 is as follows:
The overvoltage comparing circuit 157 obtains the voltage division of the output voltage Vn of the power circuit 13 through the resistor R12, the voltage division is compared with the second reference voltage, the voltage division is output to the control end through the comparator U1, when the output voltage of the power circuit 13 exceeds the rated voltage, the control circuit 11 receives the overvoltage signal to stop the work of the power circuit 13 module in time, and the circuit is protected.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the claims. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.

Claims (6)

1. The charging pile charging module is characterized by comprising a control circuit, a power circuit and an equalization control circuit; the control circuit is respectively and electrically connected with the power circuit and the balance control circuit; the power circuit is electrically connected with the balance control circuit;
The equalization control circuit synthesizes a modulation signal according to the acquired output voltage and output current of the power circuit and transmits the modulation signal to the control circuit; the control circuit controls the power circuit to regulate the current output voltage and current according to the modulation signal and the acquired standard voltage and standard current, and specifically comprises the control circuit controls the power circuit to regulate the current output voltage and current according to the modulation signal so that the output voltage is positioned in a range of a number set taking the standard voltage as a center and a first value as a radius, and the output current is positioned in a range of a number set taking the standard current as a center and a second value as a radius;
the equalization control circuit comprises a current amplifying circuit, a voltage follower circuit and an error amplifying circuit;
The acquisition end of the current amplifying circuit is electrically connected with the output end of the power circuit, and the output end of the current amplifying circuit is electrically connected with the input end of the error amplifying circuit; the acquisition end of the voltage follower circuit is electrically connected with the output end of the power circuit, and the output end of the voltage follower circuit is electrically connected with the input end of the error amplifying circuit; the output end of the error amplifying circuit is electrically connected with the input end of the control circuit;
The current amplifying circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a capacitor C1 and a first amplifier;
The resistor R1 is connected in series with the output end of the power circuit, the first end of the resistor R2 is electrically connected with the first end of the resistor R1, and the second end of the resistor R2 is electrically connected with the non-inverting end of the first amplifier; the first end of the resistor R3 is electrically connected with the second end of the resistor R1, and the second end of the resistor R3 is electrically connected with the inverting end of the first amplifier; the first end of the resistor R4 is electrically connected with the inverting end of the first amplifier, and the second end of the resistor R4 is electrically connected with the output end of the first amplifier; the first end of the capacitor C1 is electrically connected with the inverting end of the first amplifier, and the second end of the capacitor C1 is electrically connected with the output end of the first amplifier; the output end of the first amplifier is electrically connected with the input end of the error amplifying circuit;
The voltage follower circuit comprises a resistor R5, a resistor R6, a resistor R7 and a second amplifier;
The first end of the resistor R5 is electrically connected with the output end of the power circuit, and the second end of the resistor R5 is electrically connected with the first end of the resistor R6 and the first end of the resistor R7 respectively; the second end of the resistor R6 is electrically connected with the non-inverting end of the second amplifier; the second end of the resistor R7 is grounded; the inverting terminal of the second amplifier is electrically connected with the output terminal of the second amplifier; the output end of the second amplifier is electrically connected with the input end of the error amplifying circuit;
The error amplifying circuit comprises a resistor R8, a resistor R9, a resistor R10, a resistor R11, a capacitor C2, a capacitor C3 and a third amplifier;
The first end of the resistor R8 is electrically connected with the output end of the first amplifier, and the second end of the resistor R8 is electrically connected with the positive phase end of the third amplifier; the first end of the resistor R9 is electrically connected with the output end of the second amplifier, and the second end of the resistor R9 is electrically connected with the positive phase end of the third amplifier; the first end of the resistor R10 is electrically connected with the second end of the resistor R9 and the first end of the capacitor C2 respectively, and the second end is grounded; the second end of the capacitor C2 is grounded; the first end of the resistor R11 is electrically connected with the inverting end of the third amplifier, and the second end of the resistor R11 is electrically connected with the output end of the third amplifier; the first end of the capacitor C3 is electrically connected with the inverting end of the third amplifier, and the second end of the capacitor C3 is electrically connected with the output end of the third amplifier; the output end of the third amplifier is electrically connected with the input end of the control circuit, and the inverting end of the third amplifier inputs a first reference voltage.
2. The charging pile charging module according to claim 1, wherein the equalization control circuit generates an overvoltage signal according to the collected output voltage of the power circuit and transmits the overvoltage signal to the control circuit; and the control circuit controls the power circuit to stop working according to the overvoltage signal.
3. The charging pile charging module according to claim 2, wherein the equalization control circuit further comprises an overvoltage comparison circuit; the acquisition end of the overvoltage comparison circuit is electrically connected with the output end of the power circuit, and the output end of the overvoltage comparison circuit is electrically connected with the input end of the control circuit;
the overvoltage comparison circuit comprises a resistor R12, a resistor R13, a resistor R14, a resistor R15, a resistor R16, a capacitor C4, a capacitor C5 and a fourth amplifier;
the first end of the resistor R12 is electrically connected with the output end of the power circuit, and the second end of the resistor R12 is electrically connected with the positive end of the fourth amplifier and the first end of the resistor R13 respectively; the second end of the resistor R13 is grounded; the first end of the resistor R14 is electrically connected with the positive phase end of the fourth amplifier, and the second end of the resistor R14 is electrically connected with the output end of the fourth amplifier; the first end of the capacitor C4 is electrically connected with the positive phase end of the fourth amplifier, and the second end of the capacitor C4 is electrically connected with the output end of the fourth amplifier; the inverting terminal of the fourth amplifier is connected with a second reference voltage;
The first end of the resistor R15 is electrically connected with the output end of the fourth amplifier, and the second end of the resistor R15 is electrically connected with the first end of the resistor R16, the first end of the capacitor C5 and the input end of the control circuit respectively; a second terminal of the resistor R16 and a second terminal of the capacitor C5 are grounded.
4. A current sharing method applied to a charging pile, wherein the charging pile comprises a charging control device, a switch control device, N split direct current contactors, 1 total direct current contactor and N charging pile charging modules according to any one of claims 1 to 3;
The charging control device is electrically connected with the switch control device; the switch control device is respectively and electrically connected with the split direct current contactor and the total direct current contactor; the charging pile charging module is connected to the input end of the total direct current contactor through a corresponding direct current separating contactor; the charging control device is electrically connected with the input end of the total direct current contactor; the charging control device is respectively connected with the charging pile charging module in a communication way; the charging pile charging module is used for accessing an alternating current power grid; the output end of the total direct current contactor is used for connecting electric equipment through a charging gun;
The flow equalizing method comprises the following steps:
The charging control device obtains rated power and output voltage range of the charging pile charging module and electricity consumption requirement of the electric equipment;
the charging control device distributes the number of the charging pile charging modules required by meeting the electricity demand according to the rated power, the output voltage range and the electricity demand, calculates standard voltage and standard current for the distributed charging pile charging modules according to the rated power, the output voltage range and the electricity demand, and sends the standard voltage and the standard current to the corresponding charging pile charging modules;
The charging control device controls the split direct current contactor corresponding to the allocated charging pile charging module to be closed through the switch control device, the allocated charging pile charging module discharges based on the corresponding standard voltage and standard current, and the allocated charging pile charging module feeds back an output voltage and an output current to the charging control device;
And the charging control device acquires the total voltage at the input end of the total direct current contactor, and if the total voltage is smaller than or equal to the voltage in the electricity demand, the switching control device controls the total direct current contactor to be closed so as to supply power to the electric equipment.
5. The current sharing method of claim 4, further comprising the step of: the charging control device updates the standard voltage and the standard current according to the output voltage and the output current fed back by the allocated charging pile charging module;
The charging control device updates the standard voltage and the standard current according to the output voltage and the output current fed back by the allocated charging pile charging module, and the charging control device comprises:
When the difference value between the output current and the standard current is smaller than-0.2 ampere, the charging control device increases the standard voltage according to a first preset amount and sends the increased standard voltage down to the corresponding allocated charging pile charging module;
When the difference value between the output current and the standard current is larger than 0.2 ampere, the charging control device reduces the standard voltage according to a second preset amount and sends the reduced standard voltage down to the corresponding allocated charging pile charging module;
when the difference between the output current and the standard current is within-0.2 ampere and 0.2 ampere, the charging control device does not update the standard voltage.
6. The current sharing method of claim 5, further comprising the step of:
if the number of times that the standard voltage of the allocated charging pile charging module is updated is equal to the preset number of times, the charging control device issues a standard voltage with a voltage value of zero to the corresponding allocated charging pile charging module, controls the corresponding allocated charging pile charging module to stop working, and controls the corresponding DC-DC separating contactor to be disconnected through the switch control device;
And the charging control device redistributes one or more charging pile charging modules from the unassigned charging pile charging modules, sends the standard voltage and the standard current to the reassigned charging pile charging modules, and controls the reassigned charging pile charging modules to correspond to the split direct current contactors to be closed through the switch control device.
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102710000A (en) * 2012-05-21 2012-10-03 中国电力科学研究院 Parallel current sharing circuit of charging module of electric automobile charger
CN110323925A (en) * 2019-07-05 2019-10-11 中铁第一勘察设计院集团有限公司 The load flow equalizing circuit constituted based on amplifier
CN114844028A (en) * 2022-05-31 2022-08-02 上海海拉电子有限公司 Power supply current balancing device and control method thereof
CN115693637A (en) * 2022-11-15 2023-02-03 迈普通信技术股份有限公司 Direct-current power supply grid-connected device, system and method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102710000A (en) * 2012-05-21 2012-10-03 中国电力科学研究院 Parallel current sharing circuit of charging module of electric automobile charger
CN110323925A (en) * 2019-07-05 2019-10-11 中铁第一勘察设计院集团有限公司 The load flow equalizing circuit constituted based on amplifier
CN114844028A (en) * 2022-05-31 2022-08-02 上海海拉电子有限公司 Power supply current balancing device and control method thereof
CN115693637A (en) * 2022-11-15 2023-02-03 迈普通信技术股份有限公司 Direct-current power supply grid-connected device, system and method

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