CN111509970A - Bidirectional converter - Google Patents

Bidirectional converter Download PDF

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Publication number
CN111509970A
CN111509970A CN202010325969.1A CN202010325969A CN111509970A CN 111509970 A CN111509970 A CN 111509970A CN 202010325969 A CN202010325969 A CN 202010325969A CN 111509970 A CN111509970 A CN 111509970A
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CN
China
Prior art keywords
power supply
auxiliary power
circuit
battery
battery side
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Granted
Application number
CN202010325969.1A
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Chinese (zh)
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CN111509970B (en
Inventor
刘志敏
杨明聪
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Shenzhen Infy Power Co ltd
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Shenzhen Infy Power Co ltd
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Publication of CN111509970A publication Critical patent/CN111509970A/en
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Publication of CN111509970B publication Critical patent/CN111509970B/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/20—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by converters located in the vehicle
    • B60L53/22—Constructional details or arrangements of charging converters specially adapted for charging electric vehicles
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
    • 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
    • H02J2207/10—Control circuit supply, e.g. means for supplying power to the control circuit
    • 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
    • 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
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0006—Arrangements for supplying an adequate voltage to the control circuit of converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0012—Control circuits using digital or numerical techniques
    • 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
    • H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
    • Y02T10/92—Energy efficient charging or discharging systems for batteries, ultracapacitors, supercapacitors or double-layer capacitors specially adapted for vehicles
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/14—Plug-in electric vehicles
    • 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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20—End-user application control systems

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Stand-By Power Supply Arrangements (AREA)
  • Dc-Dc Converters (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention provides a bidirectional converter designed by a low-power-consumption auxiliary power supply, which comprises an AC/DC circuit, a DC/DC circuit, a first auxiliary power supply and a second auxiliary power supply, wherein the input end of the first auxiliary power supply is connected with the output end of the AC/DC circuit, the output end of the first auxiliary power supply is respectively connected to a control circuit on an AC side and a control circuit on a battery side, the input end of the second auxiliary power supply is connected to a port on the battery side, and the output end of the second auxiliary power supply is respectively connected to the control circuit on the AC side and the control circuit on the battery side. The two auxiliary power supplies of the bidirectional converter provided by the invention are mutually backed up, have the function of simultaneously supplying power to the alternating current side and the battery side, can meet the requirement that only one auxiliary power supply is used for working in a standby mode or a normal working mode, and reduce the loss in the standby and normal working processes.

Description

Bidirectional converter
Technical Field
The invention belongs to the field of converters, and particularly relates to a bidirectional converter with low-power-consumption auxiliary power supply design.
Background
The bidirectional converter is used for charging the new energy automobile to a great extent, and for most new energy automobile owners, charging at a destination is an optimal mode, so that the trouble of frequently running a direct current charging station can be avoided. An On-board charger (On-board charger) is a key component for converting alternating current into direct current required by a battery and determining charging power and efficiency; the advancement of OBC technology has a large relationship with the user charging experience. With the technical development and the continuous expansion of the market of new energy automobiles, the conventional 3.3kW OBC product can no longer meet the requirements of OEMs, and the OBC has qualitative changes in function and performance in the coming years.
Traditional two-way converter, two auxiliary power supply simultaneous workings, two-way converter auxiliary power supply can both normally work when guaranteeing forward and reverse work, can often extend out a set of winding more on the transformer and supply power for the auxiliary power supply of one side in addition, when the output voltage of one side in addition is higher than the winding output voltage that extends, just replace the auxiliary power supply power by the output voltage of one side in addition and supply power, adopt this kind of mode power supply, the energy is through secondary conversion during the standby, the efficiency is on the low side, when normally working, two auxiliary power supply simultaneous workings, single auxiliary power supply's load is less, and it increases the consumption to add a set of winding.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the problem that the power consumption of an auxiliary power supply is high in a bidirectional converter in the prior art.
In order to solve the technical problems, the invention adopts the technical scheme that: the bidirectional converter comprises an AC/DC circuit, a DC/DC circuit, a first auxiliary power supply and a second auxiliary power supply, wherein the input end of the first auxiliary power supply is connected to the output end of the AC/DC circuit, the output end of the first auxiliary power supply is respectively connected to a control circuit on an AC side and a control circuit on a battery side, the input end of the second auxiliary power supply is connected to a port on the battery side, and the output end of the second auxiliary power supply is respectively connected to the control circuit on the AC side and the control circuit on the battery side.
Further, the control circuit on the alternating current side comprises an alternating current side processor and a sampling and driving circuit, and the battery side control circuit comprises a battery side processor and a sampling and driving circuit.
Further, the alternating current side processor circuit is connected with the AC/DC circuit, and the battery side processor circuit is connected with the DC/DC circuit; and the battery side processor circuit is in communication connection with the alternating current side processor circuit.
Furthermore, the bidirectional converter is also provided with a communication module, and the battery side processor circuit is in communication connection with the upper monitoring device through the communication module.
Furthermore, the control IC of the first auxiliary power supply is an analog IC, the output end of the IC error amplifier is connected with the AC side processor circuit through a triode, and the AC side processor circuit is provided with an enabling triode for controlling PMW output of the analog IC.
Furthermore, the second auxiliary power supply control IC is an analog IC, the output end of the IC error amplifier is connected with the battery side processor circuit through a triode, and the battery side processor circuit is provided with an enabling triode for controlling PMW output of the analog IC.
Further, the communication module is a CAN communication, and the ac side processor circuit and the battery side processor circuit are DSP technologies.
The invention has the beneficial effects that: the two auxiliary power supplies of the bidirectional converter provided by the invention are mutually backed up, have the function of simultaneously supplying power to the alternating current side control circuit and the battery side control circuit, can supply power by using only one auxiliary power supply in a standby mode or a normal working mode, and reduce the loss in the standby and normal working processes.
Drawings
The detailed structure of the invention is described in detail below with reference to the accompanying drawings
FIG. 1 is a schematic diagram of a prior art bi-directional converter;
FIG. 2 is a schematic diagram of a bidirectional converter designed for a low standby power auxiliary power supply of the present invention;
FIG. 3 is a schematic diagram of a first embodiment of the bidirectional converter of FIG. 2;
FIG. 4 is a schematic diagram of a second embodiment of the bidirectional converter of FIG. 2;
fig. 5 is a schematic diagram of a third embodiment of the bidirectional converter of fig. 2.
Detailed Description
In order to explain technical contents, structural features, and objects and effects of the present invention in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the embodiments.
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
Any feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise, i.e. each feature is simply an example of a generic series of equivalent or similar features unless expressly stated otherwise.
Referring to fig. 2, the present invention provides a bidirectional converter with low power consumption and auxiliary power supply design, which includes an AC/DC circuit, a DC/DC circuit, a first auxiliary power supply and a second auxiliary power supply, wherein an input terminal of the first auxiliary power supply is connected to an output terminal of the AC/DC circuit, an output terminal of the first auxiliary power supply is respectively connected to a control circuit on an AC side and a control circuit on a battery side, an input terminal of the second auxiliary power supply is connected to a port on the battery side, and an output terminal of the second auxiliary power supply is respectively connected to the control circuit on the AC side and the control circuit on the battery side.
The two auxiliary power supplies of the bidirectional converter provided by the invention are mutually backed up, have the function of simultaneously supplying power to the alternating current side control circuit and the battery side control circuit, can meet the requirement that only one auxiliary power supply is used for working in a standby mode or a normal working mode, and reduce the loss in the standby and normal working processes.
Referring to fig. 1, a conventional bidirectional converter structure is shown, which employs two auxiliary power supplies to operate simultaneously. In order to ensure that the power can be supplied to the alternating current side and the battery side when the transformer works in the forward direction and the reverse direction respectively, a group of windings are extended more to supply power to the auxiliary source on the other side on the transformer, when the output voltage on the other side is higher than the output voltage of the extended windings, the output voltage on the other side replaces the auxiliary source power supply to supply power, the power is supplied by adopting the mode, the energy is subjected to secondary conversion during standby, the efficiency is lower, when the transformer works normally, the two auxiliary sources work simultaneously, the load of a single auxiliary source is smaller, the power consumption is increased by adding a group of windings, and the efficiency is lower.
Fig. 2 shows a bidirectional converter designed for a low-power consumption auxiliary power supply, which includes an AC/DC circuit, a DC/DC circuit, a first auxiliary power supply and a second auxiliary power supply, in the present invention, an AC side of the bidirectional converter sequentially forms a main power circuit with the AC/DC circuit, the DC/DC circuit and a battery side, the others are control circuits, inputs of the two auxiliary power supplies are power signals, outputs of the two auxiliary power supplies are connected to power input terminals of all the control circuits, and power supplies are provided for the control circuits. Specifically, an input end of the first auxiliary power supply is connected to an output end of the AC/DC circuit, an output end of the first auxiliary power supply is connected to the control circuit on the AC side and the control circuit on the battery side, an input end of the second auxiliary power supply is connected to the port on the battery side, and an output end of the second auxiliary power supply is connected to the control circuit on the AC side and the control circuit on the battery side.
The control circuit of the alternating current side comprises an alternating current side processor circuit, a sampling circuit and a driving circuit, the battery side control circuit comprises a battery side processor circuit, a sampling circuit and a driving circuit, and meanwhile, the first auxiliary power supply and the second auxiliary power supply are respectively connected with the communication module and supply power to the communication module; in addition, the AC side processor circuit is connected with the AC/DC circuit, the battery side processor circuit is connected with the DC/DC circuit and is used for detecting the electricity utilization voltage, and the battery side processor circuit is connected with the AC side processor circuit in a communication mode.
More specifically, the control IC of the first auxiliary power supply is an analog IC, the output end of the IC error amplifier is connected with an alternating-current side processor circuit through a triode, and the alternating-current side processor circuit is provided with an enabling triode for controlling PMW output of the analog IC.
The second auxiliary power supply control IC is also an analog IC, the output end of the IC error amplifier is connected with a battery side processor circuit through a triode, and the battery side processor circuit is also provided with an enabling triode for controlling PMW output of the analog IC.
The AC side processor circuit and the battery side processor circuit are DSP technology.
A communication module is also arranged in the bidirectional converter, and the further communication module is CAN communication.
The battery side DSP is connected with the set upper-level monitoring communication through the communication module, and information uploading and instruction receiving are carried out through the communication module.
The structure of the device shows that the first auxiliary power supply and the second auxiliary power supply can back up each other and can supply power to the control circuits on the alternating current side and the battery side.
The principle of the bidirectional converter for turning off the first/second auxiliary power supply is as follows: the AC side DSP and the battery side DSP close PWM output of the first/second auxiliary power supply by detecting Cbus voltage and Cout voltage, so that the first/second auxiliary power supply has no output, wherein the Cbus voltage is AC/DC output voltage or rectified AC voltage, and the Cout voltage is battery side voltage.
Several embodiments are specifically enumerated below:
example 1
This embodiment will be described by taking an ac side as an input and a battery side as an output. As shown in fig. 3, the module includes an AC/DC circuit, a DC/DC circuit, an AC-side DSP circuit and a sampling driving circuit, a battery-side DSP circuit and a DC/DC sampling driving circuit, a communication module, a first auxiliary power supply, and a second auxiliary power supply.
The alternating current input voltage is converted into high-voltage direct current voltage after passing through an AC/DC circuit (power factor correction), and the high-voltage direct current voltage is converted into direct current output voltage required by an electric vehicle battery through the DC/DC circuit.
The output of the first auxiliary power supply is controlled by the alternating current side DSP, is in an enabling state and has output;
the input end of the first auxiliary power supply is from an AC/DC output (Cbus voltage), the output end A of the first auxiliary power supply supplies power to the AC side DSP and the sampling driving circuit, the output end B of the first auxiliary power supply supplies power to the DC side DSP and the sampling driving circuit, and the output end C of the first auxiliary power supply supplies power to the communication module.
The output of the second auxiliary power supply is controlled by the battery-side DSP, and is in an disabled state and has no output.
Example 2
In this embodiment, a battery side is taken as an input and an AC side is taken as an output, and as shown in fig. 4, the modules include an AC/DC circuit, a DC/DC circuit, an AC side DSP circuit and a sampling driving circuit, a battery side DSP circuit and a DC/DC sampling driving circuit, a communication module, a first auxiliary power supply, and a second auxiliary power supply.
The DC input voltage is converted into high-voltage DC voltage after passing through a DC/DC circuit, and is converted into AC output voltage after passing through an inverter circuit.
And the AC side DSP and the battery side DSP close the PWM output of the first auxiliary power supply by detecting the Cbus voltage and the Cout voltage, so that the first auxiliary power supply has no output.
The output of the second auxiliary power supply is controlled by the DSP at the DC side, is in an enabling state and has output.
The input end of the second auxiliary power supply is from the Cout voltage, the output end D of the second auxiliary power supply supplies power to the DSP at the battery side and the sampling driving circuit, the output E of the second auxiliary power supply supplies power to the DSP at the side and the sampling driving circuit, and the output F of the second auxiliary power supply supplies power to the communication module.
Example 3
In this embodiment, to display the standby state, as shown in fig. 5, the bidirectional converter includes an AC/DC circuit, a DC/DC circuit, an AC-side DSP circuit, a sampling and driving circuit, a battery-side DSP circuit, a DC/DC sampling and driving circuit, a communication module, a first auxiliary power supply, and a second auxiliary power supply.
And the AC side DSP and the battery side DSP close the PWM output of the second auxiliary power supply by detecting the Cbus voltage and the Cout voltage, so that the second auxiliary power supply has no output.
The output of the first auxiliary power supply is controlled by the AC side DSP, is in an enabling state and has output.
The output of the second auxiliary power supply is controlled by the battery-side DSP, and is in an disabled state and has no output.
While the above embodiments 1 to 3 are the enabling states of the auxiliary power supplies in three cases, the embodiment 3 may be replaced by the standby state in which the auxiliary power supply is powered by the second auxiliary power supply, and one auxiliary power supply is guaranteed to supply power.
In summary, the bidirectional converter designed by the low-power-consumption auxiliary power supply provided by the invention can reduce the power consumption of the auxiliary power supply by the output backup of the two auxiliary power supplies and the addition of a simple control circuit, and compared with other schemes, the bidirectional converter is low in cost and easy to implement; in addition, the alternating current side and the battery side DSP always work, communication is not interrupted, the fault condition of the bidirectional converter can be monitored in real time, and when the charging equipment is separated from a standby state, the bidirectional converter can quickly respond, so that starting time is saved.
The first … … and the second … … are only used for name differentiation and do not represent how different the importance and position of the two are.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (7)

1. A bidirectional converter designed by a low-power consumption auxiliary power supply is characterized in that: the power supply comprises an AC/DC circuit, a DC/DC circuit, a first auxiliary power supply and a second auxiliary power supply, wherein the input end of the first auxiliary power supply is connected to the output end of the AC/DC circuit, the output end of the first auxiliary power supply is respectively connected to a control circuit on an AC side and a control circuit on a battery side, the input end of the second auxiliary power supply is connected to a port on the battery side, and the output end of the second auxiliary power supply is respectively connected to the control circuit on the AC side and the control circuit on the battery side.
2. The bi-directional converter of low power consumption auxiliary power supply design according to claim 1, wherein the control circuit on the ac side comprises an ac side processor, a sampling and driving circuit, and the control circuit on the battery side comprises a battery side processor, a sampling and driving circuit.
3. The bi-directional converter of low power consumption auxiliary power supply design as claimed in claim 2, wherein said AC-side processor circuit is connected to an AC/DC circuit, and said battery-side processor circuit is connected to a DC/DC circuit; and the battery side processor circuit is in communication connection with the alternating current side processor circuit.
4. The bi-directional converter of low power consumption auxiliary power supply design as claimed in claim 3, wherein said bi-directional converter is further provided with a communication module, and said battery side processor circuit is connected with a set upper monitoring communication through said communication module.
5. The bi-directional converter of low power consumption auxiliary power supply design according to claim 2, wherein the control IC of the first auxiliary power supply is an analog IC, and the IC error amplifier output is connected to the ac-side processor circuit via a transistor, and the ac-side processor circuit is provided with an enable transistor for controlling the PMW output of the analog IC.
6. The bi-directional converter of low power consumption auxiliary power supply design according to claim 5, wherein the second auxiliary power supply control IC is an analog IC, and the IC error amplifier output is connected to the battery side processor circuit via a transistor, and the battery side processor circuit is provided with an enable transistor for controlling the PMW output of the analog IC.
7. The bi-directional converter of low power consumption auxiliary power supply design according to any of claims 2-6, wherein the communication module is CAN communication and the AC-side processor circuit and the battery-side processor circuit are DSPs.
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