CN112583279A - Control method and system suitable for bidirectional isolation type DCDC converter - Google Patents

Control method and system suitable for bidirectional isolation type DCDC converter Download PDF

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Publication number
CN112583279A
CN112583279A CN202011482007.3A CN202011482007A CN112583279A CN 112583279 A CN112583279 A CN 112583279A CN 202011482007 A CN202011482007 A CN 202011482007A CN 112583279 A CN112583279 A CN 112583279A
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module
voltage
reference voltage
isolation type
cllc
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CN112583279B (en
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罗方利
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Wuhan Baoyuan Xinneng Technology Co.,Ltd.
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Wuhan Powfuture Power Source Technology Co ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/3353—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery 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
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
    • 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
    • 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
    • H02M3/1588—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 comprising at least one synchronous rectifier element
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
    • H02M3/33592—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J2207/20—Charging or discharging characterised by the power electronics converter

Abstract

The invention provides a control method and a control system suitable for a bidirectional isolation type DCDC converter, which belong to the technical field of inverter power supplies, wherein the control system suitable for the bidirectional isolation type DCDC converter comprises a front-stage BOOST/BUCK module, a bidirectional isolation type CLLC module and a control unit, wherein an external power supply is electrically connected with the bidirectional isolation type CLLC module, the bidirectional isolation type CLLC module is electrically connected with the front-stage BOOST/BUCK module, and the front-stage BOOST/BUCK module is electrically connected with an external energy storage battery; the control unit is used for controlling the front-stage BOOST/BUCK module and the bidirectional isolation type CLLC module to use the electric energy stored by the external energy storage battery to supply power to an external load when the external power supply is powered off or controlling the front-stage BOOST/BUCK module and the bidirectional isolation type CLLC module to use the external power supply to charge the external energy storage battery when the external power supply is powered on. The invention has the advantages of electric isolation of input and output and rapid power supply to the external load when the external power supply is powered off.

Description

Control method and system suitable for bidirectional isolation type DCDC converter
Technical Field
The invention relates to the technical field of inverter power supplies, in particular to a control method and a control system suitable for a bidirectional isolation type DCDC converter.
Background
The new energy automobile carries batteries with considerable total capacity, and the capacity of the batteries can gradually decline due to operation loss, so that the requirement of the endurance capacity of the new energy automobile cannot be met, and the batteries are gradually retired. The method has economic significance and environmental protection significance for scientific recycling of the retired batteries.
In the fields of communication base stations, servers, data machine rooms and medical treatment, the requirement on power utilization quality is high, and even if power failure occurs in the power grid, a backup power supply is connected to ensure that power equipment continues to work. The capacity of the batteries of the new energy automobile which is retired can basically meet the application requirements of the fields. Since the electric energy form and the voltage level of the battery of the new energy automobile are inconsistent with those of the electric equipment, a corresponding conversion device is needed to convert the electric energy of the battery into the electric energy form and the voltage required by the electric equipment.
In the prior art, a BUCK/BOOST conversion circuit converts the electric energy of a battery into the electric energy form and the voltage required by electric equipment, the BUCK/BOOST conversion circuit has a wider voltage regulation range, a faster corresponding speed and very simple and reliable control, but the BUCK/BOOST conversion circuit is a non-isolated converter and is not beneficial to reducing the damage of other equipment when the converter or the battery is damaged. The LLC converter circuit utilizes resonant soft switching technology, has high power density and efficiency, and is an isolated DCDC converter. The LLC conversion circuit has a topology structure of unidirectional work and a topology structure of bidirectional work. However, the LLC converter circuit has a disadvantage of narrow voltage regulation range, and is generally used in applications where the voltage regulation ratio is fixed or the voltage regulation range is relatively narrow.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, provides a control method and a control system suitable for a bidirectional isolation type DCDC converter, and has the advantages of input and output electrical isolation and rapid power supply to an external load when an external power supply is powered off.
The purpose of the invention is realized by the following technical scheme: a control system suitable for a bidirectional isolation type DCDC converter comprises a preceding stage BOOST/BUCK module, a bidirectional isolation type CLLC module and a control unit, wherein an external power supply is electrically connected with the bidirectional isolation type CLLC module, the bidirectional isolation type CLLC module is electrically connected with the preceding stage BOOST/BUCK module, and the preceding stage BOOST/BUCK module is electrically connected with an external energy storage battery;
the control unit is used for controlling the front-stage BOOST/BUCK module and the bidirectional isolation type CLLC module to supply power to an external load by using electric energy stored by an external energy storage battery when an external power supply is powered off.
The invention has the advantages that the front-stage BOOST/BUCK module works in a closed-loop mode, and the input-output voltage and the power flow direction of the whole DCDC converter are adjusted by adjusting the conduction duty ratio of upper and lower pipes of each bridge arm of the front-stage BOOST/BUCK module. The electric energy stored by the external energy storage battery is used for supplying power to an external load, and the MOS tube on the secondary side of the bidirectional isolation type CLLC module works in a synchronous rectification mode, so that the efficiency is improved. The control unit controls the front-stage BOOST/BUCK module and the bidirectional isolation type CLLC module to convert the electric energy stored by the external energy storage battery into an electric energy form and voltage required by an external load, so that power is supplied to the external load, the input and output electrical isolation is achieved, and the external load is quickly supplied with power when an external power supply is powered off.
Further, the front-stage BOOST/BUCK module comprises a plurality of groups of bridge arms, each group of bridge arms comprises two switching tubes connected in series, and the two switching tubes are in complementary conduction.
The technical scheme has the advantages that the N-phase BOOST/BUCK circuit is formed by the multiple groups of bridge arms, the upper switch tube of each bridge arm is in a synchronous rectification mode when the preceding-stage BOOST/BUCK module performs boosting operation, and the lower switch tube is in a synchronous rectification mode when the preceding-stage BOOST/BUCK module performs voltage reduction operation, so that the efficiency is improved.
Further, the controlling unit controls the front stage BOOST/BUCK module and the bidirectional isolation type CLLC module to supply power to the external load by using the electric energy stored by the external energy storage battery when the external power supply is powered off,
the control unit calculates a battery side voltage deviation according to a preset battery side reference voltage and a battery current voltage when an external power supply is powered off, and calculates a load side reference voltage correction according to the battery side voltage deviation, wherein the battery side reference voltage is a voltage when an external energy storage battery finishes discharging;
the control unit calculates a load side reference voltage according to the load side reference voltage correction amount;
the control unit calculates the voltage deviation of the load side according to the reference voltage of the load side and calculates the total reference current;
calculating the current deviation of each bridge arm of the preceding stage BOOST/BUCK module, and calculating the duty ratio regulating quantity of each bridge arm according to the current deviation;
the control unit generates PWM waveforms according to the duty ratio regulating quantity of each bridge arm to control each bridge arm to work;
and starting the bidirectional isolation type CLLC module and controlling the working mode of the bidirectional isolation type CLLC module.
The control unit calculates the voltage deviation of the battery side according to the preset voltage reference of the battery side and the current voltage of the battery when the external power supply is powered off, and calculates the correction quantity of the reference voltage of the load side according to the voltage deviation of the battery side; calculating a load side reference voltage according to the load side reference voltage correction; calculating load side voltage deviation according to the load side reference voltage, calculating the load side voltage deviation according to the load side reference voltage by the control unit, and calculating total reference current; calculating the current deviation of each bridge arm of the preceding-stage BOOST/BUCK module, and calculating the duty ratio regulating quantity of each bridge arm according to the current deviation; the control unit generates PWM waveforms according to the duty ratio regulating quantity of each bridge arm to control each bridge arm to work, the conduction duty ratio of upper and lower pipes of each bridge arm of the front-stage BOOST/BUCK module is regulated to regulate the output electric energy of the DCDC converter to an external load, and the MOS pipe of the secondary side of the bidirectional isolation type CLLC module works in a synchronous rectification mode, so that the efficiency is improved.
Furthermore, the carrier signals of the bridge arms lag behind T degrees in sequence, wherein T is 360/N, and N is the number of the bridge arms.
The further scheme has the beneficial effects that bridge arms of the front-stage BOOST/BUCK module work in a staggered mode, so that current and voltage ripples are smaller.
A control system suitable for a bidirectional isolation type DCDC converter comprises a preceding stage BOOST/BUCK module, a bidirectional isolation type CLLC module and a control unit, wherein an external power supply is electrically connected with the bidirectional isolation type CLLC module, the bidirectional isolation type CLLC module is electrically connected with the preceding stage BOOST/BUCK module, and the preceding stage BOOST/BUCK module is electrically connected with an external energy storage battery;
the control unit is used for controlling the front-stage BOOST/BUCK module and the bidirectional isolation type CLLC module to charge an external energy storage battery by using an external power supply when the external power supply is powered on.
The method has the advantages that the front-stage BOOST/BUCK module works in a closed-loop mode, and the input-output voltage and the power flow direction of the whole DCDC converter are adjusted by adjusting the conduction duty ratio of upper and lower pipes of each bridge arm of the front-stage BOOST/BUCK module. An external power supply is used for charging an external energy storage battery, and an MOS tube on the primary side of the bidirectional isolation type CLLC module works in a synchronous rectification mode, so that the efficiency is improved. The control unit controls the front-stage BOOST/BUCK module and the bidirectional isolation type CLLC module to convert electric energy of an external power supply into an electric energy form and voltage required by the external energy storage battery, the external energy storage battery is charged, input and output electrical isolation is achieved, and when the external power supply is electrified, the external energy storage battery is rapidly charged.
Further, the front-stage BOOST/BUCK module comprises a plurality of groups of bridge arms, each group of bridge arms comprises two switching tubes connected in series, and the two switching tubes are in complementary conduction.
The technical scheme has the advantages that the N-phase BOOST/BUCK circuit is formed by the multiple groups of bridge arms, the upper switch tube of each bridge arm is in a synchronous rectification mode when the preceding-stage BOOST/BUCK module performs boosting operation, and the lower switch tube is in a synchronous rectification mode when the preceding-stage BOOST/BUCK module performs voltage reduction operation, so that the efficiency is improved.
Further, the control unit is used for controlling the front-stage BOOST/BUCK module and the bidirectional isolation type CLLC module to charge the external energy storage battery by using the external power supply when the external power supply is powered on,
the control unit calculates a battery side voltage deviation according to a preset battery side reference voltage and a battery current voltage when an external power supply is powered off, and calculates a load side reference voltage correction according to the battery side voltage deviation, wherein the battery side reference voltage is a voltage when an external energy storage battery finishes charging;
the control unit calculates a load side reference voltage according to the load side reference voltage correction amount;
the control unit calculates the voltage deviation of the load side according to the reference voltage of the load side and calculates the total reference current;
calculating the current deviation of each bridge arm of the preceding stage BOOST/BUCK module, and calculating the duty ratio regulating quantity of each bridge arm according to the current deviation;
the control unit generates PWM waveforms according to the duty ratio regulating quantity of each bridge arm to control the work of each bridge arm,
and starting the bidirectional isolation type CLLC module and controlling the working mode of the bidirectional isolation type CLLC module.
The control unit calculates the voltage deviation of the battery side according to the preset voltage reference of the battery side and the current voltage of the battery when the external power supply is powered off, and calculates the correction quantity of the reference voltage of the load side according to the voltage deviation of the battery side; calculating a load side reference voltage according to the load side reference voltage correction; the control unit calculates the voltage deviation of the load side according to the reference voltage of the load side and calculates the total reference current; calculating the current deviation of each bridge arm of the preceding-stage BOOST/BUCK module, and calculating the duty ratio regulating quantity of each bridge arm according to the current deviation; the control unit generates PWM waveforms according to the duty ratio regulating quantity of each bridge arm to control each bridge arm to work, the conduction duty ratio of upper and lower pipes of each bridge arm of the front-stage BOOST/BUCK module is regulated to regulate the electric energy output by the DCDC converter to an external energy storage battery, and the MOS pipe on the primary side of the bidirectional isolation type CLLC module works in a synchronous rectification mode, so that the efficiency is improved.
Furthermore, the carrier signals of the bridge arms lag behind T degrees in sequence, wherein T is 360/N, and N is the number of the bridge arms.
The further scheme has the beneficial effects that bridge arms of the front-stage BOOST/BUCK module work in a staggered mode, so that current and voltage ripples are smaller.
A control method suitable for a bidirectional isolation type DCDC converter comprises the following steps,
when detecting the power failure of an external power supply, calculating a battery side voltage deviation according to a preset battery side reference voltage and the current voltage of a battery, and calculating a load side reference voltage correction according to the battery side voltage deviation, wherein the battery side reference voltage is the voltage of the external energy storage battery when the external energy storage battery finishes discharging;
calculating a load-side reference voltage according to the load-side reference voltage correction amount;
the control unit calculates the voltage deviation of the load side according to the reference voltage of the load side and calculates the total reference current;
calculating the current deviation of each bridge arm of the preceding stage BOOST/BUCK module, and calculating the duty ratio regulating quantity of each bridge arm according to the current deviation;
generating PWM waveforms according to the duty ratio regulating quantity of each bridge arm of the preceding-stage BOOST/BUCK module to control each bridge arm of the preceding-stage BOOST/BUCK module to work,
and starting the bidirectional isolation type CLLC module and controlling the working mode of the bidirectional isolation type CLLC module to supply power to an external load.
The method has the advantages that when the external power supply is powered off, the voltage deviation of the battery side is calculated according to the preset battery side reference voltage and the current voltage of the battery, and the correction quantity of the load side reference voltage is calculated according to the voltage deviation of the battery side; calculating a load side reference voltage according to the load side reference voltage correction; the control unit calculates the voltage deviation of the load side according to the reference voltage of the load side and calculates the total reference current; calculating the current deviation of each bridge arm of the preceding-stage BOOST/BUCK module, and calculating the duty ratio regulating quantity of each bridge arm according to the current deviation; and PWM waveforms are generated according to the duty ratio regulating quantity of each bridge arm to control the work of each bridge arm, the conduction duty ratio of upper and lower pipes of each bridge arm of the front-stage BOOST/BUCK module is regulated to regulate the output electric energy of the DCDC converter to an external load, and the MOS pipe of the secondary side of the bidirectional isolation type CLLC module works in a synchronous rectification mode, so that the efficiency is improved.
A control method suitable for a bidirectional isolation type DCDC converter comprises the following steps,
when detecting that an external power supply is electrified, calculating a battery side voltage deviation according to a preset battery side reference voltage and a current voltage of a battery, and calculating a load side reference voltage correction according to the battery side voltage deviation, wherein the battery side reference voltage is a voltage when an external energy storage battery finishes charging;
calculating a load-side reference voltage according to the load-side reference voltage correction amount;
the control unit calculates the voltage deviation of the load side according to the reference voltage of the load side and calculates the total reference current;
calculating the current deviation of each bridge arm of the preceding-stage BOOST/BUCK module, and calculating the duty ratio regulating quantity of each bridge arm according to the current deviation;
generating PWM waveforms according to the duty ratio regulating quantity of each bridge arm of the preceding-stage BOOST/BUCK module to control each bridge arm of the preceding-stage BOOST/BUCK module to work,
and starting the bidirectional isolation type CLLC module and controlling the working mode of the bidirectional isolation type CLLC module to supply power to the external energy storage battery.
The method has the advantages that when the external power supply is powered on, the voltage deviation of the battery side is calculated according to the preset voltage reference of the battery side and the current voltage of the battery, and the correction quantity of the reference voltage of the load side is calculated according to the voltage deviation of the battery side; calculating a load side reference voltage according to the load side reference voltage correction; the control unit calculates the voltage deviation of the load side according to the reference voltage of the load side and calculates the total reference current; calculating the current deviation of each bridge arm of the preceding-stage BOOST/BUCK module, and calculating the duty ratio regulating quantity of each bridge arm according to the current deviation; and PWM waveforms are generated according to the duty ratio regulating quantity of each bridge arm to control the work of each bridge arm, the conduction duty ratio of upper and lower pipes of each bridge arm of the front-stage BOOST/BUCK module is regulated to regulate the output electric energy of the DCDC converter to an external energy storage battery, and the MOS pipe on the primary side of the bidirectional isolation type CLLC module works in a synchronous rectification mode, so that the efficiency is improved.
Drawings
Fig. 1 is a schematic structural diagram of a control system suitable for a bidirectional isolated DCDC converter according to the present invention;
FIG. 2 is a schematic circuit diagram of a control system for a bidirectional isolated DCDC converter according to the present invention for showing a front-stage BOOST/BUCK module;
fig. 3 is a schematic circuit diagram of a control system for a bidirectional isolated DCDC converter according to the present invention, showing a bidirectional isolated CLLC module;
fig. 4 is a schematic flow chart of a control method for a bidirectional isolated DCDC converter according to the present invention, which is used for controlling the power supply of an external load using the electric energy stored in an external energy storage battery;
fig. 5 is a schematic flow chart of a control method for a bidirectional isolated DCDC converter according to the present invention, which is used for charging an external energy storage battery using an external power supply.
Detailed Description
The technical solutions of the present invention are further described in detail below with reference to the accompanying drawings, but the scope of the present invention is not limited to the following.
Example 1
Referring to fig. 1 and 3, a control system suitable for a bidirectional isolation type DCDC converter includes a front stage BOOST/BUCK module, a bidirectional isolation type CLLC module and a control unit, an external power supply is electrically connected to the bidirectional isolation type CLLC module, the bidirectional isolation type CLLC module is electrically connected to the front stage BOOST/BUCK module, and the front stage BOOST/BUCK module is electrically connected to an external energy storage battery.
Referring to fig. 2, the front stage BOOST/BUCK module includes a plurality of sets of bridge arms, each set of bridge arms includes two switching tubes connected in series, and the two switching tubes are complementarily turned on.
Specifically, the multiple groups of bridge arms form an N-fold N-phase BOOST/BUCK circuit, an upper switch tube of each bridge arm is in a synchronous rectification mode when the preceding stage BOOST/BUCK module performs BOOST operation, and a lower switch tube is in a synchronous rectification mode when the preceding stage BOOST/BUCK module performs BUCK operation, so that the efficiency is improved.
The control unit is used for controlling the front-stage BOOST/BUCK module and the bidirectional isolation type CLLC module to supply power to an external load by using electric energy stored by an external energy storage battery when the external power supply is powered off. The following is a detailed description.
Referring to fig. 5, the control unit is used for controlling the front-stage BOOST/BUCK module and the bidirectional isolation CLLC module to charge the external energy storage battery by using the external power supply when the external power supply is powered on,
when an external power supply is powered off, the control unit calculates a battery side voltage deviation according to a preset battery side reference voltage and a battery current voltage, and it is worth to say that the battery side voltage deviation is equal to the battery side reference voltage-the battery current voltage;
calculating a load-side reference voltage correction according to the battery-side voltage deviation, wherein the battery-side reference voltage is the voltage when the external energy storage battery finishes discharging, and it is worth explaining that the battery-side voltage deviation is introduced into a battery voltage PID controller, the load-side reference voltage correction is the output quantity (-1) of the PID controller, and the load-side reference voltage correction is limited between-6V and + 4V;
the control unit calculates a load-side reference voltage according to the load-side reference voltage correction amount, and it is worth to say that the load-side reference voltage is equal to the load-side reference voltage correction amount + 54V;
acquiring the current voltage of a load side, calculating the voltage deviation of the load side by a control unit according to the reference voltage of the load side, and calculating the total reference current; calculating the current deviation of each bridge arm of the preceding stage BOOST/BUCK module, and calculating the duty ratio regulating quantity of each bridge arm according to the current deviation, wherein it is worth to say that the load side voltage deviation is load side reference voltage-load side current voltage, the load side voltage deviation is introduced into a load side PID controller, the output quantity of a load side voltage control loop PID is subjected to amplitude limiting to be used as a total reference current, the amplitude limiting range is from preset discharging reference current to preset charging reference current, and it is worth to say that the system specifies the discharging current direction to be a reference positive direction, so the discharging current instruction is a positive value, the charging current direction is opposite to the discharging current direction, and therefore the charging current instruction is a negative value. Calculating a reference current of a bridge arm according to the total reference current, wherein the reference current of the bridge arm is total reference current/N, N is the number of the bridge arms, the current deviation of the mth bridge arm is the reference current of the bridge arm-the current of the mth bridge arm, and introducing the current deviation of the mth bridge arm into a PID controller of the bridge arm to obtain a duty ratio regulating quantity of the mth bridge arm;
the control unit generates PWM waveforms according to the duty ratio regulating quantities of the bridge arms to control the bridge arms to work, and it is worth explaining that the duty ratio regulating quantities of the bridge arms are superposed with direct-current voltage feedforward components to generate modulation waveforms so as to generate the PWM waveforms; it is worth to be further noted that the carrier signals of the bridge arms lag behind by T ° in sequence, where T is 360/N and N is the number of the bridge arms, so that the bridge arms work in a staggered manner, and a smaller current-voltage ripple can be obtained;
starting the bidirectional isolation type CLLC module and controlling the working mode of the bidirectional isolation type CLLC module, wherein the front-stage BOOST/BUCK module is started, after the bus voltage between the front-stage BOOST/BUCK module and the bidirectional isolation type CLLC module is established, the bidirectional isolation type CLLC module is started slowly (namely, the frequency is gradually reduced to the preset frequency from high-frequency starting, the preset frequency is the resonance frequency of the bidirectional isolation type CLLC module, and the process is called a slow start process), and the bidirectional isolation type CLLC module is kept to operate in an open loop mode at the resonance frequency by a duty ratio of 50%.
Specifically, the control unit calculates a battery side voltage deviation according to a preset battery side reference voltage and a battery current voltage when an external power supply is powered off, and calculates a load side reference voltage correction amount according to the battery side voltage deviation; calculating a load side reference voltage according to the load side reference voltage correction; the control unit calculates the voltage deviation of the load side according to the reference voltage of the load side and calculates the total reference current; calculating the current deviation of each bridge arm of the preceding-stage BOOST/BUCK module, and calculating the duty ratio regulating quantity of each bridge arm according to the current deviation; the control unit generates PWM waveforms according to the duty ratio regulating quantity of each bridge arm to control each bridge arm to work, the conduction duty ratio of upper and lower pipes of each bridge arm of the front-stage BOOST/BUCK module is regulated to regulate the output electric energy of the DCDC converter to an external load, and the MOS pipe on the primary side of the bidirectional isolation type CLLC module works in a synchronous rectification mode, so that the efficiency is improved.
Example 2
Referring to fig. 1 and 3, a control system suitable for a bidirectional isolation type DCDC converter includes a front stage BOOST/BUCK module, a bidirectional isolation type CLLC module and a control unit, an external power supply is electrically connected to the bidirectional isolation type CLLC module, the bidirectional isolation type CLLC module is electrically connected to the front stage BOOST/BUCK module, and the front stage BOOST/BUCK module is electrically connected to an external energy storage battery.
Referring to fig. 2, the front stage BOOST/BUCK module includes a plurality of sets of bridge arms, each set of bridge arms includes two switching tubes connected in series, and the two switching tubes are complementarily turned on.
Specifically, the multiple groups of bridge arms form an N-fold N-phase BOOST/BUCK circuit, an upper switch tube of each bridge arm is in a synchronous rectification mode when the preceding stage BOOST/BUCK module performs BOOST operation, and a lower switch tube is in a synchronous rectification mode when the preceding stage BOOST/BUCK module performs BUCK operation, so that the efficiency is improved.
The control unit is used for controlling the front-stage BOOST/BUCK module and the bidirectional isolation type CLLC module to charge the external energy storage battery by using the external power supply when the external power supply is powered on. The following is a detailed description.
Referring to fig. 5, the control unit is used for controlling the front-stage BOOST/BUCK module and the bidirectional isolation CLLC module to charge the external energy storage battery by using the external power supply when the external power supply is powered on,
when an external power supply is powered off, the control unit calculates a battery side voltage deviation according to a preset battery side reference voltage and a battery current voltage, and it is worth to say that the battery side voltage deviation is equal to the battery side reference voltage-the battery current voltage;
calculating a load-side reference voltage correction according to the battery-side voltage deviation, wherein the battery-side reference voltage is the voltage when the external energy storage battery finishes charging, and it is worth explaining that the battery-side voltage deviation is introduced into a battery voltage PID controller, the load-side reference voltage correction is the output quantity (-1) of the PID controller, and the load-side reference voltage correction is limited between-6V and + 4V;
the control unit calculates a load-side reference voltage according to the load-side reference voltage correction amount, and it is worth to say that the load-side reference voltage is equal to the load-side reference voltage correction amount + 54V;
acquiring the current voltage of a load side, calculating the voltage deviation of the load side by a control unit according to the reference voltage of the load side, and calculating the total reference current; calculating the current deviation of each bridge arm of the preceding stage BOOST/BUCK module, and calculating the duty ratio regulating quantity of each bridge arm according to the current deviation, wherein it is worth to say that the load side voltage deviation is load side reference voltage-load side current voltage, the load side voltage deviation is introduced into a load side PID controller, the output quantity of a load side voltage control loop PID is subjected to amplitude limiting to be used as a total reference current, the amplitude limiting range is from preset discharging reference current to preset charging reference current, and it is worth to say that the system specifies the discharging current direction to be a reference positive direction, so the discharging current instruction is a positive value, the charging current direction is opposite to the discharging current direction, and therefore the charging current instruction is a negative value. Calculating a reference current of a bridge arm according to the total reference current, wherein the reference current of the bridge arm is total reference current/N, N is the number of the bridge arms, the current deviation of the mth bridge arm is the reference current of the bridge arm-the current of the mth bridge arm, and introducing the current deviation of the mth bridge arm into a PID controller of the bridge arm to obtain a duty ratio regulating quantity of the mth bridge arm;
the control unit generates PWM waveforms according to the duty ratio regulating quantities of the bridge arms to control the bridge arms to work, and it is worth explaining that the duty ratio regulating quantities of the bridge arms are superposed with direct-current voltage feedforward components to generate modulation waveforms so as to generate the PWM waveforms; it is worth to be further noted that the carrier signals of the bridge arms lag behind by T ° in sequence, where T is 360/N and N is the number of the bridge arms, so that the bridge arms work in a staggered manner, and a smaller current-voltage ripple can be obtained;
starting the bidirectional isolation type CLLC module and controlling the working mode of the bidirectional isolation type CLLC module, wherein the front-stage BOOST/BUCK module is started, after the bus voltage between the front-stage BOOST/BUCK module and the bidirectional isolation type CLLC module is established, the bidirectional isolation type CLLC module is started slowly (namely, the frequency is gradually reduced to the preset frequency from high-frequency starting, the preset frequency is the resonance frequency of the bidirectional isolation type CLLC module, and the process is called a slow start process), and the bidirectional isolation type CLLC module is kept to operate in an open loop mode at the resonance frequency by a duty ratio of 50%.
Specifically, when the external power supply is powered on, the control unit calculates a battery side voltage deviation according to a preset battery side reference voltage and a battery current voltage, and calculates a load side reference voltage correction amount according to the battery side voltage deviation; calculating a load side reference voltage according to the load side reference voltage correction; the control unit calculates the voltage deviation of the load side according to the reference voltage of the load side and calculates the total reference current; calculating the current deviation of each bridge arm of the preceding-stage BOOST/BUCK module, and calculating the duty ratio regulating quantity of each bridge arm according to the current deviation; the control unit generates PWM waveforms according to the duty ratio regulating quantity of each bridge arm to control each bridge arm to work, the conduction duty ratio of upper and lower pipes of each bridge arm of the front-stage BOOST/BUCK module is regulated to regulate the electric energy output by the DCDC converter to an external energy storage battery, and the MOS pipe on the primary side of the bidirectional isolation type CLLC module works in a synchronous rectification mode, so that the efficiency is improved.
Example 3
Referring to fig. 1 and 3, a control system suitable for a bidirectional isolation type DCDC converter includes a front stage BOOST/BUCK module, a bidirectional isolation type CLLC module and a control unit, an external power supply is electrically connected to the bidirectional isolation type CLLC module, the bidirectional isolation type CLLC module is electrically connected to the front stage BOOST/BUCK module, and the front stage BOOST/BUCK module is electrically connected to an external energy storage battery.
Referring to fig. 2, the front stage BOOST/BUCK module includes a plurality of sets of bridge arms, each set of bridge arms includes two switching tubes connected in series, and the two switching tubes are complementarily turned on.
Specifically, the multiple groups of bridge arms form an N-fold N-phase BOOST/BUCK circuit, an upper switch tube of each bridge arm is in a synchronous rectification mode when the preceding stage BOOST/BUCK module performs BOOST operation, and a lower switch tube is in a synchronous rectification mode when the preceding stage BOOST/BUCK module performs BUCK operation, so that the efficiency is improved.
The control unit is used for controlling the front-stage BOOST/BUCK module and the bidirectional isolation type CLLC module to supply power to an external load by using electric energy stored by an external energy storage battery when the external power supply is powered off. The following is a detailed description.
Referring to fig. 4, the control unit is used for controlling the front-stage BOOST/BUCK module and the bidirectional isolation CLLC module to charge the external energy storage battery by using the external power supply when the external power supply is powered on,
when an external power supply is powered off, the control unit calculates a battery side voltage deviation according to a preset battery side reference voltage and a battery current voltage, and it is worth to say that the battery side voltage deviation is equal to the battery side reference voltage-the battery current voltage;
calculating a load-side reference voltage correction according to the battery-side voltage deviation, wherein the battery-side reference voltage is the voltage when the external energy storage battery finishes discharging, and it is worth explaining that the battery-side voltage deviation is introduced into a battery voltage PID controller, the load-side reference voltage correction is the output quantity (-1) of the PID controller, and the load-side reference voltage correction is limited between-6V and + 4V;
the control unit calculates a load-side reference voltage according to the load-side reference voltage correction amount, and it is worth to say that the load-side reference voltage is equal to the load-side reference voltage correction amount + 54V;
acquiring the current voltage of a load side, calculating the voltage deviation of the load side by a control unit according to the reference voltage of the load side, and calculating the total reference current; calculating the current deviation of each bridge arm of the preceding stage BOOST/BUCK module, and calculating the duty ratio regulating quantity of each bridge arm according to the current deviation, wherein it is worth to say that the load side voltage deviation is load side reference voltage-load side current voltage, the load side voltage deviation is introduced into a load side PID controller, the output quantity of a load side voltage control loop PID is subjected to amplitude limiting to be used as a total reference current, the amplitude limiting range is from preset discharging reference current to preset charging reference current, and it is worth to say that the system specifies the discharging current direction to be a reference positive direction, so the discharging current instruction is a positive value, the charging current direction is opposite to the discharging current direction, and therefore the charging current instruction is a negative value. Calculating a reference current of a bridge arm according to the total reference current, wherein the reference current of the bridge arm is total reference current/N, N is the number of the bridge arms, the current deviation of the mth bridge arm is the reference current of the bridge arm-the current of the mth bridge arm, and introducing the current deviation of the mth bridge arm into a PID controller of the bridge arm to obtain a duty ratio regulating quantity of the mth bridge arm;
the control unit generates PWM waveforms according to the duty ratio regulating quantities of the bridge arms to control the bridge arms to work, and it is worth explaining that the duty ratio regulating quantities of the bridge arms are superposed with direct-current voltage feedforward components to generate modulation waveforms so as to generate the PWM waveforms; it is worth to be further noted that the carrier signals of the bridge arms lag behind by T ° in sequence, where T is 360/N and N is the number of the bridge arms, so that the bridge arms work in a staggered manner, and a smaller current-voltage ripple can be obtained;
starting the bidirectional isolation type CLLC module and controlling the working mode of the bidirectional isolation type CLLC module, wherein the front-stage BOOST/BUCK module is started, after the bus voltage between the front-stage BOOST/BUCK module and the bidirectional isolation type CLLC module is established, the bidirectional isolation type CLLC module is started slowly (namely, the frequency is gradually reduced to the preset frequency from high-frequency starting, the preset frequency is the resonance frequency of the bidirectional isolation type CLLC module, and the process is called a slow start process), and the bidirectional isolation type CLLC module is kept to operate in an open loop mode at the resonance frequency by a duty ratio of 50%.
Specifically, the control unit calculates a battery side voltage deviation according to a preset battery side reference voltage and a battery current voltage when an external power supply is powered off, and calculates a load side reference voltage correction amount according to the battery side voltage deviation; calculating a load side reference voltage according to the load side reference voltage correction; the control unit calculates the voltage deviation of the load side according to the reference voltage of the load side and calculates the total reference current; calculating the current deviation of each bridge arm of the preceding-stage BOOST/BUCK module, and calculating the duty ratio regulating quantity of each bridge arm according to the current deviation; the control unit generates PWM waveforms according to the duty ratio regulating quantity of each bridge arm to control each bridge arm to work, the conduction duty ratio of upper and lower pipes of each bridge arm of the front-stage BOOST/BUCK module is regulated to regulate the output electric energy of the DCDC converter to an external load, and the MOS pipe on the primary side of the bidirectional isolation type CLLC module works in a synchronous rectification mode, so that the efficiency is improved.
The control unit is also used for controlling the front-stage BOOST/BUCK module and the bidirectional isolation type CLLC module to charge the external energy storage battery by using the external power supply when the external power supply is powered on. The following is a detailed description.
Referring to fig. 5, the control unit is used for controlling the front-stage BOOST/BUCK module and the bidirectional isolation CLLC module to charge the external energy storage battery by using the external power supply when the external power supply is powered on,
when an external power supply is powered off, the control unit calculates a battery side voltage deviation according to a preset battery side reference voltage and a battery current voltage, and it is worth to say that the battery side voltage deviation is equal to the battery side reference voltage-the battery current voltage;
calculating a load-side reference voltage correction according to the battery-side voltage deviation, wherein the battery-side reference voltage is the voltage when the external energy storage battery finishes charging, and it is worth explaining that the battery-side voltage deviation is introduced into a battery voltage PID controller, the load-side reference voltage correction is the output quantity (-1) of the PID controller, and the load-side reference voltage correction is limited between-6V and + 4V;
the control unit calculates a load-side reference voltage according to the load-side reference voltage correction amount, and it is worth to say that the load-side reference voltage is equal to the load-side reference voltage correction amount + 54V;
acquiring the current voltage of a load side, calculating the voltage deviation of the load side by a control unit according to the reference voltage of the load side, and calculating the total reference current; calculating the current deviation of each bridge arm of the preceding stage BOOST/BUCK module, and calculating the duty ratio regulating quantity of each bridge arm according to the current deviation, wherein it is worth to say that the load side voltage deviation is load side reference voltage-load side current voltage, the load side voltage deviation is introduced into a load side PID controller, the output quantity of a load side voltage control loop PID is subjected to amplitude limiting to be used as a total reference current, the amplitude limiting range is from preset discharging reference current to preset charging reference current, and it is worth to say that the system specifies the discharging current direction to be a reference positive direction, so the discharging current instruction is a positive value, the charging current direction is opposite to the discharging current direction, and therefore the charging current instruction is a negative value. Calculating a reference current of a bridge arm according to the total reference current, wherein the reference current of the bridge arm is total reference current/N, N is the number of the bridge arms, the current deviation of the mth bridge arm is the reference current of the bridge arm-the current of the mth bridge arm, and introducing the current deviation of the mth bridge arm into a PID controller of the bridge arm to obtain a duty ratio regulating quantity of the mth bridge arm;
the control unit generates PWM waveforms according to the duty ratio regulating quantities of the bridge arms to control the bridge arms to work, and it is worth explaining that the duty ratio regulating quantities of the bridge arms are superposed with direct-current voltage feedforward components to generate modulation waveforms so as to generate the PWM waveforms; it is worth to be further noted that the carrier signals of the bridge arms lag behind by T ° in sequence, where T is 360/N and N is the number of the bridge arms, so that the bridge arms work in a staggered manner, and a smaller current-voltage ripple can be obtained;
starting the bidirectional isolation type CLLC module and controlling the working mode of the bidirectional isolation type CLLC module, wherein the front-stage BOOST/BUCK module is started, after the bus voltage between the front-stage BOOST/BUCK module and the bidirectional isolation type CLLC module is established, the bidirectional isolation type CLLC module is started slowly (namely, the frequency is gradually reduced to the preset frequency from high-frequency starting, the preset frequency is the resonance frequency of the bidirectional isolation type CLLC module, and the process is called a slow start process), and the bidirectional isolation type CLLC module is kept to operate in an open loop mode at the resonance frequency by a duty ratio of 50%.
Specifically, when the external power supply is powered on, the control unit calculates a battery side voltage deviation according to a preset battery side reference voltage and a battery current voltage, and calculates a load side reference voltage correction amount according to the battery side voltage deviation; calculating a load side reference voltage according to the load side reference voltage correction; the control unit calculates the voltage deviation of the load side according to the reference voltage of the load side and calculates the total reference current; calculating the current deviation of each bridge arm of the preceding-stage BOOST/BUCK module, and calculating the duty ratio regulating quantity of each bridge arm according to the current deviation; the control unit generates PWM waveforms according to the duty ratio regulating quantity of each bridge arm to control each bridge arm to work, the conduction duty ratio of upper and lower pipes of each bridge arm of the front-stage BOOST/BUCK module is regulated to regulate the electric energy output by the DCDC converter to an external energy storage battery, and the MOS pipe on the primary side of the bidirectional isolation type CLLC module works in a synchronous rectification mode, so that the efficiency is improved.
Example 4
Referring to fig. 4, a control method suitable for a bidirectional isolated DCDC converter specifically includes:
when an external power supply is powered off, calculating a battery side voltage deviation according to a preset battery side reference voltage and a battery current voltage, wherein the battery side voltage deviation is worth explaining as a battery side reference voltage-a battery current voltage;
calculating a load-side reference voltage correction according to the battery-side voltage deviation, wherein the battery-side reference voltage is the voltage when the external energy storage battery finishes discharging, and it is worth explaining that the battery-side voltage deviation is introduced into a battery voltage PID controller, the load-side reference voltage correction is the output quantity (-1) of the PID controller, and the load-side reference voltage correction is limited between-6V and + 4V;
calculating a load-side reference voltage according to the load-side reference voltage correction amount, wherein the load-side reference voltage is equal to the load-side reference voltage correction amount + 54V;
acquiring the current voltage of a load side, calculating the voltage deviation of the load side according to the reference voltage of the load side, and calculating the total reference current; calculating the current deviation of each bridge arm of the preceding stage BOOST/BUCK module, and calculating the duty ratio regulating quantity of each bridge arm according to the current deviation, wherein it is worth to say that the load side voltage deviation is load side reference voltage-load side current voltage, the load side voltage deviation is introduced into a load side PID controller, the output quantity of a load side voltage control loop PID is subjected to amplitude limiting to be used as a total reference current, the amplitude limiting range is a range from preset discharging reference current to preset charging reference current, and it is worth to say that the method specifies the discharging current direction to be a reference positive direction, so the discharging current instruction is a positive value, the charging current direction is opposite to the discharging current direction, and therefore the charging current instruction is a negative value. Calculating a reference current of a bridge arm according to the total reference current, wherein the reference current of the bridge arm is total reference current/N, N is the number of the bridge arms, the current deviation of the mth bridge arm is the reference current of the bridge arm-the current of the mth bridge arm, and introducing the current deviation of the mth bridge arm into a PID controller of the bridge arm to obtain a duty ratio regulating quantity of the mth bridge arm;
generating a PWM waveform according to the duty ratio regulating quantity of each bridge arm to control the work of each bridge arm, wherein the duty ratio regulating quantity of each bridge arm is superposed with a direct current voltage feedforward component to generate a modulation waveform so as to generate the PWM waveform; it is worth to be further noted that the carrier signals of the bridge arms lag behind by T ° in sequence, where T is 360/N and N is the number of the bridge arms, so that the bridge arms work in a staggered manner, and a smaller current-voltage ripple can be obtained;
starting the bidirectional isolation type CLLC module and controlling the working mode of the bidirectional isolation type CLLC module, wherein the front-stage BOOST/BUCK module is started, after the bus voltage between the front-stage BOOST/BUCK module and the bidirectional isolation type CLLC module is established, the bidirectional isolation type CLLC module is started slowly (namely, the frequency is gradually reduced to the preset frequency from high-frequency starting, the preset frequency is the resonance frequency of the bidirectional isolation type CLLC module, and the process is called a slow start process), and the bidirectional isolation type CLLC module is kept to operate in an open loop mode at the resonance frequency by a duty ratio of 50%.
Specifically, when the external power supply is powered off, the voltage deviation of the battery side is calculated according to the preset voltage reference of the battery side and the current voltage of the battery, and the correction quantity of the reference voltage of the load side is calculated according to the voltage deviation of the battery side; calculating a load side reference voltage according to the load side reference voltage correction; calculating the voltage deviation of the load side according to the reference voltage of the load side, and calculating the total reference current; calculating the current deviation of each bridge arm of the preceding-stage BOOST/BUCK module, and calculating the duty ratio regulating quantity of each bridge arm according to the current deviation; and PWM waveforms are generated according to the duty ratio regulating quantity of each bridge arm to control the work of each bridge arm, the conduction duty ratio of upper and lower pipes of each bridge arm of the front-stage BOOST/BUCK module is regulated to regulate the output electric energy of the DCDC converter to an external load, and the MOS pipe on the primary side of the bidirectional isolation type CLLC module works in a synchronous rectification mode, so that the efficiency is improved.
It should be noted that, in some embodiments, the method may be applied to the above-mentioned control system for the bidirectional isolated DCDC converter.
Example 5
Referring to fig. 5, a control method suitable for a bidirectional isolated DCDC converter specifically includes:
when the external power supply is powered on, calculating a battery side voltage deviation according to a preset battery side reference voltage and a battery current voltage, wherein the battery side voltage deviation is worth to be described as a battery side reference voltage-a battery current voltage;
calculating a load-side reference voltage correction according to the battery-side voltage deviation, wherein the battery-side reference voltage is the voltage when the external energy storage battery finishes charging, and it is worth explaining that the battery-side voltage deviation is introduced into a battery voltage PID controller, the load-side reference voltage correction is the output quantity (-1) of the PID controller, and the load-side reference voltage correction is limited between-6V and + 4V;
calculating a load-side reference voltage according to the load-side reference voltage correction amount, wherein the load-side reference voltage is equal to the load-side reference voltage correction amount + 54V;
acquiring the current voltage of a load side, calculating the voltage deviation of the load side according to the reference voltage of the load side, and calculating the total reference current; calculating the current deviation of each bridge arm of the preceding stage BOOST/BUCK module, and calculating the duty ratio regulating quantity of each bridge arm according to the current deviation, wherein it is worth to say that the load side voltage deviation is load side reference voltage-load side current voltage, the load side voltage deviation is introduced into a load side PID controller, the output quantity of a load side voltage control loop PID is subjected to amplitude limiting to be used as a total reference current, the amplitude limiting range is a range from preset discharging reference current to preset charging reference current, and it is worth to say that the method specifies the discharging current direction to be a reference positive direction, so the discharging current instruction is a positive value, the charging current direction is opposite to the discharging current direction, and therefore the charging current instruction is a negative value. Calculating a reference current of a bridge arm according to the total reference current, wherein the reference current of the bridge arm is total reference current/N, N is the number of the bridge arms, the current deviation of the mth bridge arm is the reference current of the bridge arm-the current of the mth bridge arm, and introducing the current deviation of the mth bridge arm into a PID controller of the bridge arm to obtain a duty ratio regulating quantity of the mth bridge arm;
generating a PWM waveform according to the duty ratio regulating quantity of each bridge arm to control the work of each bridge arm, wherein the duty ratio regulating quantity of each bridge arm is superposed with a direct current voltage feedforward component to generate a modulation waveform so as to generate the PWM waveform; it is worth to be further noted that the carrier signals of the bridge arms lag behind by T ° in sequence, where T is 360/N and N is the number of the bridge arms, so that the bridge arms work in a staggered manner, and a smaller current-voltage ripple can be obtained;
starting the bidirectional isolation type CLLC module and controlling the working mode of the bidirectional isolation type CLLC module, wherein the front-stage BOOST/BUCK module is started, after the bus voltage between the front-stage BOOST/BUCK module and the bidirectional isolation type CLLC module is established, the bidirectional isolation type CLLC module is started slowly (namely, the frequency is gradually reduced to the preset frequency from high-frequency starting, the preset frequency is the resonance frequency of the bidirectional isolation type CLLC module, and the process is called a slow start process), and the bidirectional isolation type CLLC module is kept to operate in an open loop mode at the resonance frequency by a duty ratio of 50%.
Specifically, when the external power supply is powered on, calculating a battery side voltage deviation according to a preset battery side reference voltage and a battery current voltage, and calculating a load side reference voltage correction amount according to the battery side voltage deviation; calculating a load side reference voltage according to the load side reference voltage correction; calculating the voltage deviation of the load side according to the reference voltage of the load side, and calculating the total reference current; calculating the current deviation of each bridge arm of the preceding-stage BOOST/BUCK module, and calculating the duty ratio regulating quantity of each bridge arm according to the current deviation; and PWM waveforms are generated according to the duty ratio regulating quantity of each bridge arm to control the work of each bridge arm, the conduction duty ratio of upper and lower pipes of each bridge arm of the front-stage BOOST/BUCK module is regulated to regulate the output electric energy of the DCDC converter to an external energy storage battery, and the MOS pipe on the primary side of the bidirectional isolation type CLLC module works in a synchronous rectification mode, so that the efficiency is improved.
It should be noted that, in some embodiments, the method may be applied to the above-mentioned control system for the bidirectional isolated DCDC converter.
The foregoing is merely a preferred embodiment of the invention, it is to be understood that the invention is not limited to the forms disclosed herein, but is not intended to be exhaustive or to limit the invention to other embodiments, and to various other combinations, modifications, and environments and may be modified within the scope of the inventive concept as expressed herein, by the teachings or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (10)

1. A control system suitable for a bidirectional isolation type DCDC converter is characterized by comprising a preceding stage BOOST/BUCK module, a bidirectional isolation type CLLC module and a control unit, wherein an external power supply is electrically connected with the bidirectional isolation type CLLC module, the bidirectional isolation type CLLC module is electrically connected with the preceding stage BOOST/BUCK module, and the preceding stage BOOST/BUCK module is electrically connected with an external energy storage battery;
the control unit is used for controlling the front-stage BOOST/BUCK module and the bidirectional isolation type CLLC module to supply power to an external load by using electric energy stored by an external energy storage battery when an external power supply is powered off.
2. The system of claim 1, wherein the front stage BOOST/BUCK module comprises a plurality of sets of legs, each set of legs comprising two switching tubes connected in series, the two switching tubes being in complementary conduction.
3. The system of claim 2, wherein the control unit controlling the pre-stage BOOST/BUCK module and the bi-directional isolation type CLLC module to supply power to the external load using the power stored in the external energy storage battery when the external power source is powered down includes,
the control unit calculates a battery side voltage deviation according to a preset battery side reference voltage and a battery current voltage when an external power supply is powered off, and calculates a load side reference voltage correction according to the battery side voltage deviation, wherein the battery side reference voltage is a voltage when an external energy storage battery finishes discharging;
the control unit calculates a load side reference voltage according to the load side reference voltage correction amount;
the control unit calculates the voltage deviation of the load side according to the reference voltage of the load side and calculates the total reference current;
calculating the current deviation of each bridge arm of the preceding stage BOOST/BUCK module, and calculating the duty ratio regulating quantity of each bridge arm according to the current deviation;
the control unit generates PWM waveforms according to the duty ratio regulating quantity of each bridge arm to control each bridge arm to work;
and starting the bidirectional isolation type CLLC module and controlling the working mode of the bidirectional isolation type CLLC module.
4. The system of claim 3, wherein the carrier signal of each bridge arm lags by T ° in sequence, where T is 360/N and N is the number of the bridge arms.
5. A control system suitable for a bidirectional isolation type DCDC converter is characterized by comprising a preceding stage BOOST/BUCK module, a bidirectional isolation type CLLC module and a control unit, wherein an external power supply is electrically connected with the bidirectional isolation type CLLC module, the bidirectional isolation type CLLC module is electrically connected with the preceding stage BOOST/BUCK module, and the preceding stage BOOST/BUCK module is electrically connected with an external energy storage battery;
the control unit is used for controlling the front-stage BOOST/BUCK module and the bidirectional isolation type CLLC module to charge an external energy storage battery by using an external power supply when the external power supply is powered on.
6. The system of claim 5, wherein the front stage BOOST/BUCK module comprises a plurality of sets of legs, each set of legs comprising two switching tubes connected in series, the two switching tubes being in complementary conduction.
7. The system as claimed in claim 6, wherein the control unit for controlling the pre-stage BOOST/BUCK module and the bidirectional isolation type CLLC module to charge the external energy storage battery using the external power when the external power is powered comprises,
the control unit calculates a battery side voltage deviation according to a preset battery side reference voltage and a battery current voltage when an external power supply is electrified, and calculates a load side reference voltage correction quantity according to the battery side voltage deviation, wherein the battery side reference voltage is a voltage when an external energy storage battery finishes charging;
the control unit calculates a load side reference voltage according to the load side reference voltage correction amount;
the control unit calculates the voltage deviation of the load side according to the reference voltage of the load side and calculates the total reference current;
calculating the current deviation of each bridge arm of the preceding stage BOOST/BUCK module, and calculating the duty ratio regulating quantity of each bridge arm according to the current deviation;
the control unit generates PWM waveforms according to the duty ratio regulating quantity of each bridge arm to control the work of each bridge arm,
and starting the bidirectional isolation type CLLC module and controlling the working mode of the bidirectional isolation type CLLC module.
8. The system of claim 7, wherein the carrier signal of each bridge arm lags by T ° in sequence, where T is 360/N and N is the number of the bridge arms.
9. A control method suitable for a bidirectional isolation type DCDC converter is characterized by comprising the following steps,
when detecting the power failure of an external power supply, calculating a battery side voltage deviation according to a preset battery side reference voltage and the current voltage of a battery, and calculating a load side reference voltage correction according to the battery side voltage deviation, wherein the battery side reference voltage is the voltage of the external energy storage battery when the external energy storage battery finishes discharging;
calculating a load-side reference voltage according to the load-side reference voltage correction amount;
the control unit calculates the voltage deviation of the load side according to the reference voltage of the load side and calculates the total reference current;
calculating the current deviation of each bridge arm of the preceding-stage BOOST/BUCK module, and calculating the duty ratio regulating quantity of each bridge arm according to the current deviation;
generating PWM waveforms according to the duty ratio regulating quantity of each bridge arm of the preceding-stage BOOST/BUCK module to control each bridge arm of the preceding-stage BOOST/BUCK module to work,
and starting the bidirectional isolation type CLLC module and controlling the working mode of the bidirectional isolation type CLLC module to supply power to an external load.
10. A control method suitable for a bidirectional isolation type DCDC converter is characterized by comprising the following steps,
when detecting that an external power supply is electrified, calculating a battery side voltage deviation according to a preset battery side reference voltage and a current voltage of a battery, and calculating a load side reference voltage correction according to the battery side voltage deviation, wherein the battery side reference voltage is a voltage when an external energy storage battery finishes charging;
calculating a load-side reference voltage according to the load-side reference voltage correction amount;
the control unit calculates the voltage deviation of the load side according to the reference voltage of the load side and calculates the total reference current;
calculating the current deviation of each bridge arm of the preceding-stage BOOST/BUCK module, and calculating the duty ratio regulating quantity of each bridge arm according to the current deviation;
generating PWM waveforms according to the duty ratio regulating quantity of each bridge arm of the preceding-stage BOOST/BUCK module to control each bridge arm of the preceding-stage BOOST/BUCK module to work,
and starting the bidirectional isolation type CLLC module and controlling the working mode of the bidirectional isolation type CLLC module to supply power to the external energy storage battery.
CN202011482007.3A 2020-12-15 2020-12-15 Control method and system suitable for bidirectional isolation type DCDC converter Active CN112583279B (en)

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