CN113364107A - New forms of energy electric automobile super capacitor charging device - Google Patents

New forms of energy electric automobile super capacitor charging device Download PDF

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Publication number
CN113364107A
CN113364107A CN202110608054.6A CN202110608054A CN113364107A CN 113364107 A CN113364107 A CN 113364107A CN 202110608054 A CN202110608054 A CN 202110608054A CN 113364107 A CN113364107 A CN 113364107A
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CN
China
Prior art keywords
resistor
capacitor
field effect
effect transistor
circuit
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Withdrawn
Application number
CN202110608054.6A
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Chinese (zh)
Inventor
刘纪
李勇
王子强
门正兴
陈虎
魏扬帆
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Chengdu Aeronautic Polytechnic
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Chengdu Aeronautic Polytechnic
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Priority to CN202110608054.6A priority Critical patent/CN113364107A/en
Publication of CN113364107A publication Critical patent/CN113364107A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
    • 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
    • B60L50/00—Electric propulsion with power supplied within the vehicle
    • B60L50/40—Electric propulsion with power supplied within the vehicle using propulsion power supplied by capacitors
    • 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
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00304—Overcurrent protection
    • 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
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/0034—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using reverse polarity correcting or protecting circuits
    • 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
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
    • 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
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
    • H02M3/1582—Buck-boost converters
    • 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
    • Y02T10/72—Electric energy management in electromobility

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention discloses a super-capacitor charging device for a new energy electric automobile, which comprises a main control chip, wherein the main control chip is connected with a power bus through an input isolating switch circuit, the input isolating switch circuit is connected with an input voltage feedback circuit, the input voltage feedback circuit is connected with an input current detection circuit, and the input current detection circuit is connected with a bidirectional BUCK-BOOST converter; the bidirectional BUCK-BOOST converter is connected with the output current detection circuit, the output current detection circuit is connected with the output voltage feedback circuit, and the output voltage feedback circuit is connected with the super capacitor through the output isolating switch circuit; the input voltage feedback circuit, the input current detection circuit, the bidirectional BUCK-BOOST converter, the output current detection circuit, the output voltage detection circuit and the output isolating switch circuit are all connected with the main control chip. The super capacitor charging circuit with the voltage boosting and reducing function is formed, the power of a charging scheme is optimized through internal digital logic, and the functions of simplifying the circuit and reducing the cost are achieved.

Description

New forms of energy electric automobile super capacitor charging device
Technical Field
The invention relates to the technical field of charging circuits, in particular to a super capacitor charging device for a new energy electric vehicle.
Background
The new energy electric vehicle (BEV) is a vehicle which takes a vehicle-mounted power supply as power and drives wheels by a motor, thereby meeting various requirements of road traffic and safety regulations. Because the influence on the environment is smaller than that of the traditional automobile, the prospect is widely seen. The charging technology of the new energy electric automobile is particularly critical, the existing charging device is insufficient in energy recovery, the converter is large in size, and electric energy cannot be recovered in the automobile braking process.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the new energy electric vehicle super capacitor charging device which can realize the recovery of electric energy in the braking process of the vehicle.
In order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows:
the super-capacitor charging device for the new energy electric automobile comprises a main control chip, wherein the main control chip is connected with a power bus through an input isolating switch circuit, the input isolating switch circuit is connected with an input voltage feedback circuit, the input voltage feedback circuit is connected with an input current detection circuit, and the input current detection circuit is connected with a bidirectional BUCK-BOOST converter;
the bidirectional BUCK-BOOST converter is connected with the output current detection circuit, the output current detection circuit is connected with the output voltage feedback circuit, and the output voltage feedback circuit is connected with the super capacitor through the output isolating switch circuit;
the input voltage feedback circuit, the input current detection circuit, the bidirectional BUCK-BOOST converter, the output current detection circuit, the output voltage detection circuit and the output isolating switch circuit are all connected with the main control chip.
Further, the input isolation switch circuit comprises a switch field effect transistor Q1 and a switch field effect transistor Q2, a resistor R3 and a transient protection diode D2 are arranged between the switch field effect transistor Q1 and the switch field effect transistor Q2, the resistor R3 is connected with a capacitor C3 in series, and the capacitor C3 is grounded; a capacitor C4 is arranged between the power bus and the switching field effect transistor Q1, and the capacitor C4 is grounded; two ends of the transient protection diode D2 are connected with the main control chip.
Further, the input voltage feedback circuit comprises a resistor R11 and a resistor R18 which are connected in series, and a resistor R12 and a resistor R16 which are connected in series, wherein the resistor R11 and the resistor R18 and the resistor R12 and the resistor R16 are respectively connected with the main control chip, the resistor R18 and the resistor R16 are both grounded, and the resistor R12 is connected with a power bus.
Furthermore, the input current detection circuit comprises a shunt resistor R1, two ends of the shunt resistor R1 are respectively connected with the input isolating switch circuit and the bidirectional BUCK-BOOST converter, and two ends of the shunt resistor R1 are respectively connected with the main control chip through a resistor R5 and a resistor R6.
Further, the bidirectional BUCK-BOOST converter comprises a switch field effect transistor Q3 and a switch field effect transistor Q6, the switch field effect transistor Q3 is connected with the input current detection circuit, the switch field effect transistor Q3 is grounded with the input current detection circuit through a capacitor C5, a capacitor C2 is connected between the switch field effect transistor Q3 and the switch field effect transistor Q6 in parallel, the capacitor C2 is connected with a diode D1, a filter capacitor C10 is arranged between the diode D1 and the switch field effect transistor Q6, the switch field effect transistor Q3, the switch field effect transistor Q6, the capacitor C2 and the diode D1 are all connected with the main control chip, and the switch field effect transistor Q6 is connected with the output current detection circuit through an inductor L1.
Further, the output current detection circuit comprises a shunt resistor R2, two ends of the shunt resistor R2 are respectively connected with the output isolating switch circuit and the bidirectional BUCK-BOOST converter, and two ends of the shunt resistor R1 are respectively connected with the main control chip through a resistor R7 and a resistor R8.
Further, the output voltage feedback circuit comprises a resistor R14 and a resistor R19 which are connected in series, and a resistor R13 and a resistor R17 which are connected in series, wherein the resistor R14 and the resistor R19 and the resistor R13 and the resistor R17 are respectively connected with the main control chip, the resistor R17 and the resistor R19 are both grounded, and the resistor R13 is connected with the super capacitor.
Further, the output isolation switch circuit comprises a switch field effect transistor Q4 and a switch field effect transistor Q5, the switch field effect transistor Q5 is connected with a resistor R4 in series, the resistor R4 is connected with a capacitor C9 in series, and a capacitor C7 is connected between the switch field effect transistor Q5 and the super capacitor in parallel; a capacitor C6 is connected between the switch field effect transistor Q5 and the output current detection circuit in parallel, a capacitor C3 is connected between the capacitor C6 and the switch field effect transistor Q5 in parallel, a diode D3 is arranged between the switch field effect transistor Q4 and the switch field effect transistor Q5, and the capacitor C6, the capacitor C3, the capacitor C9 and the capacitor C7 are all grounded.
The invention has the beneficial effects that: the scheme protects input and output, can prevent negative voltage, controls surge current and provides isolation between terminals under fault conditions. In the step-down mode, the protection FET at the power bus terminal prevents reverse current.
The main control chip is a 100V bidirectional peak current mode synchronous controller with a protection field effect transistor, and provides a step-down output voltage V2 from an input voltage V1 in a step-down mode and provides a step-down output voltage V1 from an input voltage V2 in a step-up mode. The input and output voltages may be set to 100V.
The mode of operation may be externally controlled or automatically selected via the DRXN pin. In addition, the main control chip is provided with a protective field effect tube connected with the super capacitor and the power bus terminal. The protection field effect transistor provides negative voltage protection, isolation between the input and output terminals, reverse current protection and magnetizing inrush current control during internal or external faults.
In battery backup systems and the like, the bi-directional functionality allows the battery to be charged from a higher or lower voltage power source. When power is not available, the battery will start or restart the power supply. In order to optimize the transient response, the master control chip has two error amplifiers: EA1 in boost mode and EA2 in buck mode have separate compensation pins, respectively. When the reverse inductive current is detected under the conditions of light load operation and the like, the main control chip works in a discontinuous conduction mode.
Drawings
Fig. 1 is a schematic diagram of a supercapacitor charging device of a new energy electric vehicle.
Fig. 2 is a circuit diagram a of a supercapacitor charging device of a new energy electric vehicle.
Fig. 3 is a circuit diagram B of the supercapacitor charging device of the new energy electric vehicle.
The terminal a in the circuit diagram a is connected to the terminal C in the circuit diagram B, and the terminal B in the circuit diagram a is connected to the terminal D in the circuit diagram B.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and it will be apparent to those skilled in the art that various changes may be made without departing from the spirit and scope of the invention as defined and defined in the appended claims, and all matters produced by the invention using the inventive concept are protected.
As shown in fig. 1 to 3, the new energy electric vehicle super capacitor charging device of the present scheme includes a main control chip, the main control chip is connected to a power bus through an input isolation switch circuit, the input isolation switch circuit is connected to an input voltage feedback circuit, the input voltage feedback circuit is connected to an input current detection circuit, and the input current detection circuit is connected to a bidirectional BUCK-BOOST converter.
The bidirectional BUCK-BOOST converter is connected with the output current detection circuit, the output current detection circuit is connected with the output voltage feedback circuit, and the output voltage feedback circuit is connected with the super capacitor through the output isolating switch circuit.
The input voltage feedback circuit, the input current detection circuit, the bidirectional BUCK-BOOST converter, the output current detection circuit, the output voltage detection circuit and the output isolating switch circuit are all connected with the main control chip. And the power bus can be connected with the direct current of a power battery of the new energy electric automobile and is used for providing power for the electric automobile during starting and recovering energy.
The power bus is connected to an input isolating switch, the input isolating switch is controlled by a main control chip LT8228 chip, and the input isolating switch is connected to the bidirectional BUCK-BOOST converter through an input voltage feedback circuit and an input current detection circuit. Input voltage feedback and input current sensing are connected to the LT8228 chip. And the program in the LT8228 chip runs to control the bidirectional BUCK-BOOST converter to work, so that the BUCK-BOOST conversion control is completed. The output of the bidirectional BUCK-BOOST converter is connected to the super capacitor through an output isolating switch controlled by an LT8228 chip through output current detection and output voltage feedback. The invention realizes the voltage reduction charging, the voltage boosting discharging and the maximum power point control of the super capacitor circuit, and improves the power utilization rate of the energy recovery system of the electric automobile.
The input isolation switch circuit comprises a switch field effect transistor Q1 and a switch field effect transistor Q2, a resistor R3 and a transient protection diode D2 are arranged between the switch field effect transistor Q1 and the switch field effect transistor Q2, the resistor R3 is connected with a capacitor C3 in series, and the capacitor C3 is grounded; a capacitor C4 is arranged between the power bus and the switching field effect transistor Q1, and the capacitor C4 is grounded; two ends of the transient protection diode D2 are connected with the main control chip.
The transient protection diode D2 is a gate-level transient protection diode, and the resistor R3 and the capacitor C8 form a first-order RC filter circuit for providing filtering for the gate level of the switching field effect transistor. The capacitor C4 is an input filter capacitor, and the capacitor C1 is an output filter capacitor bank. In summary, the circuit is used for controlling the connection between the power bus and the power circuit.
The input voltage feedback circuit comprises a resistor R11 and a resistor R18 which are connected in series, and a resistor R12 and a resistor R16 which are connected in series, wherein the resistor R11 and the resistor R18 are connected with the main control chip, the resistor R12 and the resistor R16 are connected with the main control chip, the resistor R18 and the resistor R16 are both grounded, and the resistor R12 is connected with a power bus. The resistor R11 and the resistor R18 form a voltage division circuit and provide input feedback voltage for the LT8228 chip. The resistor R12 and the resistor R16 constitute an input voltage detection circuit.
The input current detection circuit comprises a shunt resistor R1, two ends of a shunt resistor R1 are respectively connected with the input isolating switch circuit and the bidirectional BUCK-BOOST converter, and two ends of a shunt resistor R1 are respectively connected with the main control chip through a resistor R5 and a resistor R6. The resistor R5 and the resistor R6 form a current limiting circuit, and the LT8228 chip provides input current collection.
The bidirectional BUCK-BOOST converter comprises a switch field effect transistor Q3 and a switch field effect transistor Q6, the switch field effect transistor Q3 is connected with an input current detection circuit, the switch field effect transistor Q3 is grounded with the input current detection circuit through a capacitor C5, a capacitor C2 is connected between a switch field effect transistor Q3 and a switch field effect transistor Q6 in parallel, the capacitor C2 is connected with a diode D1, a filter capacitor C10 is arranged between the diode D1 and the switch field effect transistor Q6, the switch field effect transistor Q3, the switch field effect transistor Q6, the capacitor C2 and the diode D1 are all connected with a main control chip, and the switch field effect transistor Q6 is connected with an output current detection circuit through an inductor L1.
The inductor L1 is a buck-boost chopper inductor, the diode D1 is a bootstrap diode of the driving circuit and charges a bootstrap capacitor C2, and the capacitor C10 is a bootstrap power filter capacitor. Capacitor C5 is the input terminal power filter capacitor bank. In conclusion, the circuit forms an inverter half-bridge circuit, can realize forward voltage reduction and reverse voltage increase, and provides proper power for the super capacitor.
The output current detection circuit comprises a shunt resistor R2, two ends of a shunt resistor R2 are respectively connected with the output isolating switch circuit and the bidirectional BUCK-BOOST converter, and two ends of a shunt resistor R1 are respectively connected with the main control chip through a resistor R7 and a resistor R8. The resistor R5 and the resistor R6 form a current limiting circuit and provide input current collection for the LT8228 chip.
The output voltage feedback circuit comprises a resistor R14 and a resistor R19 which are connected in series, a resistor R13 and a resistor R17 which are connected in series, wherein the resistor R14 and the resistor R19 are connected with the main control chip, the resistor R13 and the resistor R17 are connected with the main control chip, the resistor R17 and the resistor R19 are both grounded, and the resistor R13 is connected with the super capacitor. The resistor R14 and the resistor R19 form a voltage division circuit and provide input feedback voltage for the LT8228 chip. The resistor R13 and the resistor R17 constitute an input voltage detection circuit.
The output isolation switch circuit comprises a switch field effect transistor Q4 and a switch field effect transistor Q5, wherein the switch field effect transistor Q5 is connected with a resistor R4 in series, the resistor R4 is connected with a capacitor C9 in series, and a capacitor C7 is connected between the switch field effect transistor Q5 and the super capacitor in parallel; a capacitor C6 is connected between the switch field effect transistor Q5 and the output current detection circuit in parallel, a capacitor C3 is connected between the capacitor C6 and the switch field effect transistor Q5 in parallel, a diode D3 is arranged between the switch field effect transistor Q4 and the switch field effect transistor Q5, and the capacitor C6, the capacitor C3, the capacitor C9 and the capacitor C7 are all grounded.
Diode D3 is a gate-level transient protection diode. The resistor R4 and the capacitor C9 form a first-order RC filter circuit for providing filtering for the gate stage of the field effect transistor. The capacitor C3 and the capacitor C7 are input filter capacitors, and the capacitor C6 is an output filter capacitor bank. In summary, the output isolation switch circuit is used to control the connection between the power circuit and the super capacitor.
The scheme protects input and output, can prevent negative voltage, controls surge current and provides isolation between terminals under fault conditions. In the step-down mode, the protection FET at the power bus terminal prevents reverse current.
The rest of the circuit in this embodiment. Pin 29 of the LT8228 chip is a DRVCC and control circuit supply pin; the pin provides the DRVCC regulator as well as internal control circuitry. The diode D4 and the diode D5 are pull-up diodes, and the capacitor C11 is a low-pass bypass capacitor.
Pin 17 of the LT8228 chip is a no-main-current-sharing input pin for parallel connection, pin IGND 20 is connected together through a resistor R22, and a capacitor C12 is a filter capacitor.
Pin 6 of LT8228 chip is the boost mode output current limit programming pin, which sets the V1 output current limit in boost mode by connecting resistor R23 from ISET1N to ground, and capacitor C13 is the filter capacitor.
Pin 7 of the LT8228 chip is the boost mode output current limit programming pin which sets the V2 input current limit in boost mode by connecting resistor R24 from ISET2N to ground, and capacitor C14 is the filter capacitor.
The 8 pins of the LT8228 chip are compensation pins of a boosting mode error amplifier, the VC1 is a boosting mode adjustment compensation pin of V1D voltage, V1 output current and V2 input current, and an RC compensation circuit consisting of a resistor R20 and a capacitor C20 is connected.
The 10 pin of the LT8228 chip is a boost mode error amplifier compensation pin, the VC2 is a boost mode adjustment compensation pin for V2D voltage, V1 output current and V2 input current, and an RC compensation circuit consisting of a resistor R21 and a capacitor C21 is connected.
The 5 pin of the LT8228 chip is the V1 current monitor output, and a voltage VMON1 is generated from IMON1 to ground through a connecting resistor R25 for external ADC monitoring.
Pin 13 of LT8228 chip is the V2 current monitor output, and a voltage VMON2 is generated from IMON2 to ground through connecting resistor R26 for external ADC monitoring.
Pin 11 of the LT8228 chip is the buck mode input current limit programming pin that sets the V1 input current limit in buck mode by connecting resistor R27 from ISET1P to ground, and capacitor C15 is the filter capacitor.
The 12 pin of the LT8228 chip is the buck mode output current limit programming pin, which sets the V2 output current limit in buck mode by connecting resistor R28 from ISET2P to ground, and capacitor C16 is the filter capacitor.
Pin 9 of the LT8228 chip is a soft start input pin, and a soft start capacitor C9 is connected between the SS pin and ground. When the LT8228 chip is disabled or a fault is detected, the SS pin is actively pulled low by the internal MOSFET to reset the soft start.
Pin 26 of the LT8228 chip is an SOA management timer input pin for V1 fet protection. A capacitor C18 is connected between this pin and ground to set fet turn-off and cool-down cycles during output field current in boost mode with excessive power consumption.
Pin 21 of the LT8228 chip is the internal 4V VCC supply pin. INTVCC is supplied from DRVCC, and capacitor C16 is a bypass low pass filter capacitor.
The 16 pin of the LT8228 chip is a switching frequency setting input pin, and a resistor R29 is connected from RT to a power ground to set an internal frequency, and the switching frequency ranges from 80kHz to 600 kHz.
The 22 pin of the LT8228 chip is a buck or boost regulation mode selection pin, and the buck regulation mode is selected by pulling up and the boost regulation mode is selected by pulling down. The power supply is pulled up through the resistor R9, and the mode can be adjusted through the control of an external microprocessor.
The 24 pin of the LT8228 chip is a fault status indication pin, which is an output logic pin that is pulled up to the microprocessor power supply positive through resistor R10, and which can be used to feed back a fault status to the microprocessor.
Pin 25 of the LT8228 chip is a diagnostic status pin that is pulled up to the microprocessor power supply through resistor R15 and can be used to diagnose the LT8228 chip status to the microprocessor.
In summary, the embodiment of the invention forms the super capacitor charging circuit with the voltage boosting and reducing function, optimizes the power of the charging scheme through the internal digital logic, and plays roles in simplifying the circuit and reducing the cost.
The main control chip is a 100V bidirectional peak current mode synchronous controller with a protective field effect transistor, and provides a step-down output voltage V2 from an input voltage V1 in a step-down mode and provides a step-down output voltage V1 from an input voltage V2 in a step-up mode. The input and output voltages may be set to 100V.
The mode of operation may be externally controlled or automatically selected via the DRXN pin. In addition, the main control chip is provided with a protective field effect tube connected with the super capacitor and the power bus terminal. The protection field effect transistor provides negative voltage protection, isolation between the input and output terminals, reverse current protection and magnetizing inrush current control during internal or external faults.
In battery backup systems and the like, the bi-directional functionality allows the battery to be charged from a higher or lower voltage power source. When power is not available, the battery will start or restart the power supply. In order to optimize the transient response, the master control chip has two error amplifiers: EA1 in boost mode and EA2 in buck mode have separate compensation pins, respectively. When the reverse inductive current is detected under the conditions of light load operation and the like, the main control chip works in a discontinuous conduction mode.

Claims (8)

1. The super-capacitor charging device of the new energy electric automobile is characterized by comprising a main control chip, wherein the main control chip is connected with a power bus through an input isolating switch circuit, the input isolating switch circuit is connected with an input voltage feedback circuit, the input voltage feedback circuit is connected with an input current detection circuit, and the input current detection circuit is connected with a bidirectional BUCK-BOOST converter;
the bidirectional BUCK-BOOST converter is connected with an output current detection circuit, the output current detection circuit is connected with an output voltage feedback circuit, and the output voltage feedback circuit is connected with the super capacitor through an output isolating switch circuit;
the input voltage feedback circuit, the input current detection circuit, the bidirectional BUCK-BOOST converter, the output current detection circuit, the output voltage detection circuit and the output isolating switch circuit are all connected with the main control chip.
2. The super-capacitor charging device of the new energy electric vehicle as claimed in claim 1, wherein the input isolation switch circuit comprises a switch field effect transistor Q1 and a switch field effect transistor Q2, a resistor R3 and a transient protection diode D2 are arranged between the switch field effect transistor Q1 and the switch field effect transistor Q2, the resistor R3 is connected in series with a capacitor C3, and the capacitor C3 is grounded; a capacitor C4 is arranged between the power bus and the switching field effect transistor Q1, and the capacitor C4 is grounded; and two ends of the transient protection diode D2 are connected with the main control chip.
3. The super-capacitor charging device of the new energy electric vehicle as claimed in claim 1, wherein the input voltage feedback circuit comprises a resistor R11 and a resistor R18 which are connected in series, and a resistor R12 and a resistor R16 which are connected in series, the resistor R11 and the resistor R18, and the resistor R12 and the resistor R16 are respectively connected with the main control chip, the resistor R18 and the resistor R16 are both grounded, and the resistor R12 is connected with a power bus.
4. The super-capacitor charging device of the new energy electric vehicle as claimed in claim 1, wherein the input current detection circuit comprises a shunt resistor R1, two ends of the shunt resistor R1 are respectively connected with the input isolation switch circuit and the bidirectional BUCK-BOOST converter, and two ends of the shunt resistor R1 are respectively connected with the main control chip through a resistor R5 and a resistor R6.
5. The super-capacitor charging device of the new energy electric vehicle as claimed in claim 1, wherein the bidirectional BUCK-BOOST converter comprises a switch field effect transistor Q3 and a switch field effect transistor Q6, the switch field effect transistor Q3 is connected with the input current detection circuit, the switch field effect transistor Q3 is grounded through a capacitor C5, a capacitor C2 is connected in parallel between the switch field effect transistor Q3 and the switch field effect transistor Q6, the capacitor C2 is connected with a diode D1, a filter capacitor C10 is arranged between the diode D1 and the switch field effect transistor Q6, the switch field effect transistor Q3, the switch field effect transistor Q6, the capacitor C2 and the diode D1 are all connected with the master control chip, and the switch field effect transistor Q6 is connected with the output current detection circuit through an inductor L1.
6. The super-capacitor charging device of the new energy electric vehicle as claimed in claim 1, wherein the output current detection circuit comprises a shunt resistor R2, two ends of the shunt resistor R2 are respectively connected with the output isolation switch circuit and the bidirectional BUCK-BOOST converter, and two ends of the shunt resistor R1 are respectively connected with the main control chip through a resistor R7 and a resistor R8.
7. The super-capacitor charging device of the new energy electric vehicle as claimed in claim 1, wherein the output voltage feedback circuit comprises a resistor R14 and a resistor R19 which are connected in series, and a resistor R13 and a resistor R17 which are connected in series, the resistor R14 and the resistor R19, and the resistor R13 and the resistor R17 are respectively connected with the main control chip, the resistor R17 and the resistor R19 are both grounded, and the resistor R13 is connected with the super-capacitor.
8. The super-capacitor charging device of the new energy electric vehicle as claimed in claim 1, wherein the output isolation switch circuit comprises a switch field effect transistor Q4 and a switch field effect transistor Q5, the switch field effect transistor Q5 is connected in series with a resistor R4, the resistor R4 is connected in series with a capacitor C9, and a capacitor C7 is connected in parallel between the switch field effect transistor Q5 and the super-capacitor; a capacitor C6 is connected between the switch field effect transistor Q5 and the output current detection circuit in parallel, a capacitor C3 is connected between the capacitor C6 and the switch field effect transistor Q5 in parallel, a diode D3 is arranged between the switch field effect transistor Q4 and the switch field effect transistor Q5, and the capacitor C6, the capacitor C3, the capacitor C9 and the capacitor C7 are all grounded.
CN202110608054.6A 2021-06-01 2021-06-01 New forms of energy electric automobile super capacitor charging device Withdrawn CN113364107A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113937982A (en) * 2021-10-20 2022-01-14 上海数明半导体有限公司 Switch power supply circuit, method, device, equipment and medium for charging bootstrap capacitor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113937982A (en) * 2021-10-20 2022-01-14 上海数明半导体有限公司 Switch power supply circuit, method, device, equipment and medium for charging bootstrap capacitor

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Application publication date: 20210907