CN108429453B - Vehicle-mounted high-voltage inversion conversion device and control method - Google Patents
Vehicle-mounted high-voltage inversion conversion device and control method Download PDFInfo
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- CN108429453B CN108429453B CN201810125328.4A CN201810125328A CN108429453B CN 108429453 B CN108429453 B CN 108429453B CN 201810125328 A CN201810125328 A CN 201810125328A CN 108429453 B CN108429453 B CN 108429453B
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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
- H02M3/02—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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—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
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal 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
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal 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, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal 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, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal 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, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
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- H02J2007/0067—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- 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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0009—Devices or circuits for detecting current in a converter
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention discloses a vehicle-mounted high-voltage inversion conversion device and a control method, wherein the vehicle-mounted high-voltage inversion conversion device comprises a conversion circuit; the conversion circuit includes a DC-DC circuit and a DC-AC circuit connected in series. The vehicle-mounted high-voltage inversion conversion device can provide an alternating current 220V power supply with higher power and efficiency than a low-voltage inversion conversion device for users to use. Meanwhile, a preceding-stage Buck circuit and a later-stage inversion topological structure are directly adopted in the internal topology, a transformer coupling mode is cancelled, and the control complexity and the single-piece cost are reduced; through set up the on-vehicle socket that discharges of two kinds of different powers at the vehicle end, can provide two kinds of different power alternating current power supplies and supply the user to use, can satisfy whole car V2V function.
Description
Technical Field
The invention belongs to the technical field of new energy automobile control, and relates to a vehicle-mounted high-voltage inversion conversion device and a control method for a new energy commercial vehicle.
Background
At present, a vehicle-mounted low-voltage inversion conversion device is widely applied to traditional middle and high-end automobiles, and the power utilization requirements of users in the aspects of office work, entertainment and the like by using 220V alternating current in the driving process are met. In recent years, with the large-scale popularization and promotion of the new energy automobile industry, a large number of whole automobile enterprises begin to invest in the research, development and production of new energy automobiles, the new energy automobiles are different from the traditional automobiles, and two batteries exist in the new energy automobiles: high-voltage power batteries and low-voltage storage batteries. Therefore, a new energy source can be provided for the 220V alternating current output of the new energy automobile, namely, high-voltage direct current is provided from the high-voltage power battery and is converted into 220V alternating current through the high-voltage inversion conversion device, and the alternating current and power utilization requirements of users are met.
Adopt traditional low pressure to get the electric mode, compare and adopt high-pressure power battery to get the electric mode, have following shortcoming: (1) the conversion efficiency is low. For a new energy automobile, if a traditional automobile low-voltage inversion scheme is adopted, the voltage of a high-voltage power battery needs to be converted into low voltage by DC/DC, and then the low voltage is inverted into 220V alternating current. A link of DC/DC conversion is added in the middle, so that part of power is lost; (2) the ac discharge power that can be provided is relatively low. For the conventional low-voltage inversion scheme of the vehicle, in order to prevent the over-discharge from damaging the low-voltage storage battery or the low-voltage storage battery from short-circuiting, the power generally can be supplied not to exceed 200W. The capacity of the high-voltage power battery is far greater than that of the low-voltage storage battery, and the discharge current bearing capacity is strong, so that the power required by alternating current can be theoretically greatly improved by adopting a high-voltage inversion scheme, and the power utilization requirement of a user is further met; (3) the single-piece cost and the internal control complexity are improved. The internal topology of the traditional vehicle-mounted inverter device is in a transformer coupling mode, the stabilized direct-current voltage is firstly inverted into alternating current, and then rectified and stabilized after voltage transformation is carried out through a transformer, and then inversion filtering output is carried out. The control complexity and the number of components are greatly increased.
For new energy passenger vehicles, the existing bidirectional vehicle-mounted charging device has the ac discharging function. However, for new energy commercial vehicles, since the direct current quick charging technology is adopted to charge the high-voltage power battery at present, the new energy commercial vehicles are not provided with a vehicle-mounted charging device, and therefore, a high-voltage inversion conversion device capable of supplying power to users is not provided. For the control scheme of the high-voltage inversion conversion device, at present, no corresponding patent is provided at home and abroad to provide an exact scheme, and the control scheme belongs to a blank state.
Disclosure of Invention
The invention aims to provide a vehicle-mounted high-voltage inversion conversion device and a control method, and fills the blank.
The technical scheme adopted by the invention for solving the technical problems is as follows: a vehicle-mounted high-voltage inversion conversion device comprises a conversion circuit;
the conversion circuit comprises a DC-DC circuit and a DC-AC circuit which are connected in series;
the DC-DC circuit comprises a capacitor C1, a diode D1 and a capacitor C2 which are connected in parallel, a switch device S1 is arranged on a circuit between the capacitor C1 and the cathode of the diode D1, the source of the switch device S1 is connected to the cathode of the diode D1, the drain of the switch device S1 is connected to one end of a capacitor C1, an inductor L1 is arranged on a circuit between the capacitor C2 and the cathode of the diode D1, and two ends of the capacitor C1 are DC-DC input terminals;
the DC-AC circuit comprises a switching device S2, a switching device S3, a switching device S4 and a switching device S5, wherein the drain of the switching device S2 is connected to one end of a capacitor C2, the source of the switching device S2 is connected to the drain of the switching device S3, the source of the switching device S3 is connected to the other end of a capacitor C2, the drain of the switching device S4 is connected to one end of a capacitor C2, the source of the switching device S4 is connected to the drain of a switching device S5, the source of the switching device S5 is connected to the other end of the capacitor C2, the source of the switching device S2 is connected to the source of the switching device S4 through an inductor L2 and a capacitor C3 which are connected in series, and two ends of the capacitor C3 are DC-AC output terminals.
Optionally, the vehicle-mounted high-voltage inverter conversion device further comprises a control system, wherein the control system comprises a voltage detection unit, a current detection unit, a temperature detection unit, a main controller, an SPWM controller, a first drive unit and a second drive unit;
the voltage detection unit, the current detection unit and the temperature detection unit are in signal connection with the main controller and are used for transmitting detected voltage signals, current signals and temperature signals to the main controller, the main controller is connected with the HCU through a CAN bus, and the main controller is in signal connection with the first driving unit so as to control the on-off of the conversion circuit through the first driving unit; the main controller is also connected with a second drive unit through an SPWM controller to control the DC-AC circuit through the second drive unit.
Optionally, the voltage detection unit includes an input voltage sensor VS1 and an output voltage sensor VS 2; the input voltage sensor VS1 is connected in parallel with the capacitor C1 and used for detecting the input voltage of the direct-current bus and transmitting a signal Vin of the input voltage of the direct-current bus to the main controller; the output voltage sensor VS2 is connected in parallel to the capacitor C3, and is used for detecting the ac output voltage and transmitting the rectified ac output voltage signal Vo to the main controller.
Optionally, the current detection unit includes an input current sensor IS1 and an output current sensor IS 2; the input current sensor IS1 IS used for detecting the input current of the direct current bus and transmitting the input current signal Iin of the direct current bus to the main controller; the output current sensor IS2 IS used for detecting the ac output current and sending the rectified ac output current signal Io to the main controller.
Optionally, the temperature detection unit is configured to detect a temperature of a heat sink on which the power device is mounted, and transmit the temperature signal T to the main controller.
Optionally, the main controller is configured to compare and determine the dc bus input voltage signal Vin, the dc bus input current signal Iin, the ac output voltage signal Vo, the ac output current signal Io, and the temperature signal T with a built-in protection threshold, and is configured to determine a fault.
Optionally, the first driving unit is configured to convert a PWM control signal output by the main controller into a driving signal DS1 for driving the switching device S1; the second driving unit is used for converting the SPWM control signal output by the SPWM controller into a driving signal DS2, a driving signal DS3, a driving signal DS4 and a driving signal DS5 for driving the switching device S2, the switching device S3, the switching device S4 and the switching device S5.
Optionally, the vehicle-mounted high-voltage inverter conversion device further comprises a high-voltage power battery, an HCU, an instrument and at least one vehicle-mounted discharging socket;
the high-voltage power battery is connected to a DC-DC input terminal of the conversion circuit and is used for providing high-voltage direct current for the conversion circuit;
the vehicle-mounted discharging socket is used for providing 220V alternating current power supply for users to use;
each vehicle-mounted discharging socket is provided with a discharging enabling switch key, the discharging enabling switch is connected with the HCU through a hard line, if a user presses the discharging enabling switch key, the HCU detection loop is conducted, and the HCU detection loop indicates that the user requests to use the vehicle-mounted discharging socket for discharging at the moment; if the discharging enable switch key is reset and the HCU detection loop is disconnected, the user stops requesting to use the socket at the moment and stops discharging;
the HCU communicates with the meters via the CAN bus.
The invention also adopts the following technical scheme for solving the technical problems: a control method of a vehicle-mounted high-voltage inversion conversion device comprises the following steps:
s10, when the whole vehicle simultaneously meets the following three conditions: (1) the vehicle-mounted high-voltage inversion conversion device has no fault; (2) the SOC of the high-voltage power battery is more than or equal to 30 percent; (3) when the discharge enabling switch is pressed down by a user, the whole vehicle alternating current discharge function is activated; if any condition is not met, the whole vehicle is prohibited from discharging to the outside;
s20, the HCU sends different discharge request instructions to the vehicle-mounted high-voltage inversion conversion device according to the discharge enabling switch pressed down by the user;
s30, detecting whether the discharge enabling switch is reset or the vehicle-mounted high-voltage inversion conversion device has no fault at all time by the HCU; if the discharge enabling switch is reset at the moment, the HCU sends a discharge stopping request instruction to the vehicle-mounted high-voltage inversion conversion device, and the vehicle-mounted high-voltage inversion conversion device stops discharging outwards after receiving the discharge stopping request instruction of the HCU; finishing the alternating current discharging process;
if the vehicle-mounted high-voltage inversion conversion device fails, the HCU sends failure information to the instrument and displays related failures through the instrument; the HCU sends a discharge stopping request instruction to the vehicle-mounted high-voltage inversion conversion device, and the vehicle-mounted high-voltage inversion conversion device stops discharging outwards after receiving the discharge stopping request instruction of the HCU; and finishing the alternating current discharging process.
Optionally, in S20:
if the first discharge enabling switch is pressed down, the HCU sends a discharge request instruction to the vehicle-mounted high-voltage inversion conversion device 16A;
if the second discharge enabling switch is pressed down, the HCU sends a discharge request instruction to the vehicle-mounted high-voltage inversion conversion device 10A;
if the first discharge enabling switch and the second discharge enabling switch are pressed simultaneously, the HCU only sends a discharge request command, and the vehicle-mounted high-voltage inverter conversion device outputs according to the condition that two discharge powers are simultaneously met.
The invention has the following beneficial effects: the vehicle-mounted high-voltage inversion conversion device can provide an alternating current 220V power supply with higher power and efficiency than a low-voltage inversion conversion device for users to use. Meanwhile, a preceding-stage Buck circuit and a later-stage inversion topological structure are directly adopted in the internal topology, a transformer coupling mode is cancelled, and the control complexity and the single-piece cost are reduced; two vehicle-mounted discharging sockets with different powers are arranged at the vehicle end, so that two alternating current power supplies with different powers can be provided for users to use, and the V2V function of the whole vehicle can be met; by setting the fault category of the vehicle-mounted inverter, when the vehicle-mounted inverter fails, related faults can be displayed on a whole vehicle instrument
Drawings
Fig. 1 is a main circuit diagram of a vehicle-mounted high-voltage inverter conversion device according to the invention.
Fig. 2 is a functional structure diagram of a control unit of the vehicle-mounted high-voltage inverter conversion device.
Fig. 3 is a block diagram of a vehicle control principle described in the present invention.
Fig. 4 is a control flow chart of the vehicle-mounted inverter conversion device according to the present invention.
Detailed Description
The technical solution of the present invention is further described below with reference to the following embodiments and the accompanying drawings.
Example 1
The embodiment provides a vehicle-mounted high-voltage inversion conversion device which comprises a conversion circuit.
The conversion circuit comprises a DC-DC circuit and a DC-AC circuit which are connected in series, wherein the DC-DC circuit adopts a Buck circuit, points A and B are DC-DC input terminals, and points C and D are DC-DC output terminals.
Wherein the DC-DC circuit comprises a capacitor C1, a diode D1 and a capacitor C2 which are connected in parallel; a switching device S1 (for example, a MOS transistor or the like) is provided in a circuit between the capacitor C1 and the cathode of the diode D1, specifically, the source of the switching device S1 is connected to the cathode of the diode D1, and the drain of the switching device S1 is connected to one end of the capacitor C1.
An inductor L1 is provided in a circuit between the capacitor C2 and the cathode of the diode D1.
The two ends of the capacitor C1 are DC-DC input terminals, that is, the capacitor C1 is a DC bus input capacitor and is responsible for stabilizing the DC bus voltage, the switching device S1 is responsible for controlling the on and off of the conversion circuit, the inductor L1 is a DC inductor and is responsible for smoothing the current and storing energy, the diode D1 is a freewheeling diode and provides a freewheeling circuit for the inductor L1, the capacitor C2 is an output DC capacitor and is responsible for stabilizing the output voltage of the DC-DC circuit, and the two ends of the capacitor C2 are DC-DC output terminals at this time.
The DC-AC circuit adopts a full-bridge inverter circuit, specifically, points C and D are DC-AC input terminals, and points E and F are DC-AC output terminals.
Specifically, the DC-AC circuit includes a switching device S2, a switching device S3, a switching device S4, and a switching device S5.
The drain of the switching device S2 is connected to one end of the capacitor C2, the source of the switching device S2 is connected to the drain of the switching device S3, and the source of the switching device S3 is connected to the other end of the capacitor C2.
The drain of the switching device S4 is connected to one end of the capacitor C2, the source of the switching device S4 is connected to the drain of the switching device S5, and the source of the switching device S5 is connected to the other end of the capacitor C2.
Thus, a full-bridge inverter circuit is formed by the switching device S2, the switching device S3, the switching device S4 and the switching device S5.
The source of the switching device S2 is connected to the source of the switching device S4 through an inductor L2 and a capacitor C3 connected in series, so that the capacitor C3 forms a low-pass filter circuit through the inductor L2, and at this time, both ends of the capacitor C3 are DC-AC output terminals.
In this embodiment, the vehicle-mounted high-voltage inverter conversion device further includes a control system, and the control system includes a voltage detection unit, a current detection unit, a temperature detection unit, a main controller, an SPWM controller, a first driving unit, and a second driving unit.
The voltage detection unit, the current detection unit and the temperature detection unit are in signal connection with the main controller so as to transmit voltage signals, current signals and temperature signals detected by the main controller to the main controller, the main controller is connected with an HCU (vehicle control unit, the same below) through a CAN bus, and the main controller is in signal connection with the first driving unit so as to control the on-off of the conversion circuit through the first driving unit; the main controller is further connected with a second driving unit through an SPWM controller so as to control the full-bridge inverter circuit through the second driving unit.
More preferably, the voltage detection unit includes an input voltage sensor VS1 and an output voltage sensor VS 2. An input voltage sensor VS1 is connected in parallel to the capacitor C1 and is used for detecting the dc bus input voltage and transmitting a dc bus input voltage signal Vin to the main controller. An output voltage sensor VS2 is connected in parallel to the capacitor C3 for detecting the ac output voltage and transmitting the rectified ac output voltage signal Vo to the main controller.
The current detection unit includes an input current sensor IS1 and an output current sensor IS 2. The input current sensor IS1 IS used to detect the dc bus input current and transmit the dc bus input current signal Iin to the main controller. The output current sensor IS2 IS used to detect the ac output current and provide a rectified ac output current signal Io to the main controller.
The temperature detection unit is used for detecting the temperature of a heat sink on which the power device is mounted and transmitting a temperature signal T to the main controller, wherein the power device comprises a switching device S1, a switching device S2, a switching device S3, a switching device S4, a switching device S5 and a diode D1.
The main controller is used for comparing and judging a direct current bus input voltage signal Vin, a direct current bus input current signal Iin, an alternating current output voltage signal Vo, an alternating current output current signal Io and a temperature signal T with a built-in protection threshold value for fault judgment.
The main controller and the HCU receive HCU control instructions through the CAN bus, and simultaneously feed back the working state and report faults.
The main controller controls the SPWM controller to work and stop through an enabling signal En.
The main controller calculates the peak value VPo of the output voltage signal Vo, performs voltage closed-loop control by using VPo as a feedback signal, outputs a corresponding PWM control signal to control the switching device S1 to be switched on and off, and keeps the output voltage of the vehicle-mounted inverter stable.
The main controller compares the input voltage signal Vin and the input current signal Iin of the direct current bus with a built-in input overvoltage protection threshold VinP and a built-in input overcurrent protection threshold Iin P respectively, and judges input overvoltage and overcurrent faults.
If Vin < VinP and Iin < IinP, the system is operating normally and the master controller does not process.
If Vin is greater than VinP, the input overvoltage fault is judged, the main controller enters a fault protection mode, the main controller stops outputting PWM signals to the first driving unit, the SPWM controller enabling signals are closed, the SPWM controller stops outputting the SPWM signals to the second driving unit, and meanwhile the input overvoltage fault is reported to the HCU through the CAN bus.
Similarly, if Iin > IinP, it is judged that an input overcurrent fault occurs, the main controller enters a fault protection mode, the main controller stops sending a PWM signal to the first driving unit, the SPWM controller enable signal is turned off so as to stop the SPWM controller from outputting the SPWM signal to the second driving unit, and the input overcurrent fault is reported to the HCU through the CAN bus.
The main controller calculates the peak values of the ac output voltage signal Vo and the ac output current signal Io in real time, and generates an output voltage peak signal VPo and an output current peak signal IPo. VPo and IPo are compared with the built-in output overvoltage protection threshold VoP and output overcurrent protection threshold IoP respectively to judge the output overvoltage and overcurrent faults.
If VPo < VoP, and IPo < IoP, the system is operating normally and the master controller does not.
If VPo is larger than VoP, the output overvoltage fault is judged, the main controller enters a fault protection mode, the main controller stops outputting PWM signals to the first driving unit, the SPWM controller enabling signals are closed, the SPWM controller is stopped from outputting SPWM signals to the second driving unit, and meanwhile the output overvoltage fault is reported to the HCU through the CAN bus.
Similarly, if IPo is greater than IoP, it is judged that an overcurrent fault is output, the main controller enters a fault protection mode, the main controller stops outputting a PWM signal to the first driving unit, the SPWM controller enabling signal is closed, the SPWM controller is stopped from outputting the SPWM signal to the second driving unit, and meanwhile, the overcurrent fault is reported to the HCU through the CAN bus.
And the main controller compares the temperature signal T with a built-in temperature protection threshold TP to judge the over-temperature fault of the system.
If T < TP, the system operates normally and the main controller does not process.
If T is greater than TP, the temperature fault is judged to be an over-temperature fault, the main controller enters a fault protection mode, stops outputting PWM signals to the first driving unit, closes the enabling signals of the SPWM controller, stops the SPWM controller from outputting SPWM signals to the second driving unit, and reports the over-temperature fault to the HCU through the CAN bus.
The SPWM controller is used for receiving an enabling working signal En of the main controller and judging working and stopping. And outputting a constant SPWM driving signal, controlling the switching device S2, the switching device S3, the switching device S4 and the switching device S5 to be switched on and off, and controlling the DC-AC circuit.
The first driving unit is used for converting the main controller output PWM control signal into a driving signal DS1 for driving the switching device S1.
The second driving unit is used for converting the SPWM control signal output by the SPWM controller into a driving signal DS2, a driving signal DS3, a driving signal DS4 and a driving signal DS5 for driving the switching device S2, the switching device S3, the switching device S4 and the switching device S5.
As shown in fig. 3, the vehicle-mounted high-voltage inverter conversion device further includes a high-voltage power battery, an HCU, an instrument, and at least one vehicle-mounted discharging socket.
The high-voltage power battery is used as an energy source, is connected to the DC-DC input terminal of the conversion circuit and is used for providing high-voltage direct current for the conversion circuit.
The number of the vehicle-mounted discharging sockets can be two, and the vehicle-mounted discharging sockets comprise a 220Vac and 16A standard socket and are used for providing 3.6kW power for users; and a 220Vac, 10A standard outlet for providing 2.2kW of power for consumer use
Each vehicle-mounted discharging socket is provided with a discharging enabling switch key, and the on-off of the enabling switch key is controlled by a user. The two discharging enabling switches are connected with the HCU through hard wires, if a user presses down a discharging enabling switch key, the HCU detection loop is conducted, and the user requests to use the socket to discharge at the moment. If the discharging enable switch key is reset and the HCU detection loop is disconnected, the discharging can be stopped when the user stops requesting to use the socket. Therefore, the whole vehicle has the alternating current discharge function of providing two power selections for users. The HCU communicates with the meters via the CAN bus.
Example 2
The embodiment provides a control method of a vehicle-mounted high-voltage inversion conversion device, which comprises the following steps:
s10, when the whole vehicle simultaneously meets the following three conditions: (1) the vehicle-mounted high-voltage inversion conversion device has no fault; (2) the SOC of the high-voltage power battery is more than or equal to 30 percent; (3) the discharge enable switch is pressed by the user. And activating the whole vehicle alternating current discharge function. If any condition is not met, the whole vehicle is prohibited from discharging to the outside alternating current.
And S20, the HCU sends different discharge request instructions to the vehicle-mounted high-voltage inversion conversion device according to the position of the discharge enabling switch pressed by the user.
If the first discharge enable switch is pressed at this time, the HCU sends a discharge request command to the vehicle-mounted high-voltage inverter conversion device 16A.
If the second discharge enable switch is pressed at this time, the HCU sends a discharge request command to the vehicle-mounted high-voltage inverter conversion device 10A.
If the first discharge enabling switch and the second discharge enabling switch are pressed simultaneously, the HCU only sends a discharge request instruction, and the vehicle-mounted high-voltage inverter conversion device outputs the discharge power according to the condition that two discharge powers are simultaneously met by default.
S30, detecting whether the discharge enabling switch is reset or the vehicle-mounted high-voltage inversion conversion device has no fault at all by the HCU. If the discharge enabling switch is reset at the moment, the HCU sends a discharge stopping request instruction to the vehicle-mounted high-voltage inversion conversion device, and the vehicle-mounted high-voltage inversion conversion device stops discharging outwards after receiving the HCU discharge stopping request instruction. At this time, the ac discharge flow ends.
If the vehicle-mounted high-voltage inversion conversion device fails, the HCU sends failure information to the instrument and displays related failures through the instrument; the HCU sends a discharge stopping request instruction to the vehicle-mounted high-voltage inversion conversion device, and the vehicle-mounted high-voltage inversion conversion device stops discharging outwards after receiving the discharge stopping request instruction of the HCU. At this time, the ac discharge flow ends.
Wherein, on-vehicle high pressure contravariant conversion equipment's trouble classification includes: input overvoltage faults, input undervoltage faults, input overcurrent faults, output overcurrent faults, over-temperature faults, and CAN communication faults. When any fault occurs, the vehicle-mounted high-voltage inversion conversion device reports the fault to the HCU in real time through the CAN bus. And fault information is communicated by the HCU to the meter for display. When the HCU judges the CAN communication fault at the moment, the HCU directly transmits the CAN communication fault to the instrument to display the CAN communication fault.
The sequence of the above embodiments is only for convenience of description and does not represent the advantages and disadvantages of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (4)
1. A vehicle-mounted high-voltage inversion conversion device is characterized by comprising a conversion circuit, a control system high-voltage power battery, an HCU, an instrument and at least one vehicle-mounted discharge socket;
the conversion circuit comprises a DC-DC circuit and a DC-AC circuit which are connected in series;
the DC-DC circuit comprises a capacitor C1, a diode D1 and a capacitor C2 which are connected in parallel, a switch device S1 is arranged on a circuit between the capacitor C1 and the cathode of the diode D1, the source of the switch device S1 is connected to the cathode of the diode D1, the drain of the switch device S1 is connected to one end of a capacitor C1, an inductor L1 is arranged on a circuit between the capacitor C2 and the cathode of the diode D1, and two ends of the capacitor C1 are DC-DC input terminals;
the DC-AC circuit comprises a switching device S2, a switching device S3, a switching device S4 and a switching device S5, wherein the drain electrode of the switching device S2 is connected to one end of a capacitor C2, the source electrode of the switching device S2 is connected to the drain electrode of a switching device S3, the source electrode of the switching device S3 is connected to the other end of a capacitor C2, the drain electrode of the switching device S4 is connected to one end of a capacitor C2, the source electrode of the switching device S4 is connected to the drain electrode of a switching device S5, the source electrode of the switching device S5 is connected to the other end of the capacitor C2, the source electrode of the switching device S2 is connected to the source electrode of the switching device S4 through an inductor L2 and a capacitor C3 which are connected in series, and two ends of the capacitor C3 are DC-AC output;
the control system comprises a voltage detection unit, a current detection unit, a temperature detection unit, a main controller, an SPWM controller, a first driving unit and a second driving unit;
the voltage detection unit, the current detection unit and the temperature detection unit are in signal connection with the main controller and are used for transmitting detected voltage signals, current signals and temperature signals to the main controller, the main controller is connected with the HCU through a CAN bus, and the main controller is in signal connection with the first driving unit so as to control the on-off of the conversion circuit through the first driving unit; the main controller is also connected with a second driving unit through an SPWM controller so as to control the DC-AC circuit through the second driving unit;
the voltage detection unit includes an input voltage sensor VS1 and an output voltage sensor VS 2; the input voltage sensor VS1 is connected in parallel with the capacitor C1 and used for detecting the input voltage of the direct-current bus and transmitting a signal Vin of the input voltage of the direct-current bus to the main controller; the output voltage sensor VS2 is connected in parallel with the capacitor C3 and used for detecting the AC output voltage and transmitting the rectified AC output voltage signal Vo to the main controller;
the current detection unit includes an input current sensor IS1 and an output current sensor IS 2; the input current sensor IS1 IS used for detecting the input current of the direct current bus and transmitting the input current signal Iin of the direct current bus to the main controller; the output current sensor IS2 IS used for detecting alternating output current and sending a rectified alternating output current signal Io to the main controller;
the main controller is used for comparing and judging a direct current bus input voltage signal Vin, a direct current bus input current signal Iin, an alternating current output voltage signal Vo, an alternating current output current signal Io and a temperature signal T with a built-in protection threshold value for fault judgment;
the first driving unit is used for converting a PWM control signal output by the main controller into a driving signal DS1 for driving the switching device S1; the second driving unit is used for converting the SPWM control signal output by the SPWM controller into a driving signal DS2, a driving signal DS3, a driving signal DS4 and a driving signal DS5 for driving the switching device S2, the switching device S3, the switching device S4 and the switching device S5;
the high-voltage power battery is connected to a DC-DC input terminal of the conversion circuit and is used for providing high-voltage direct current for the conversion circuit; the vehicle-mounted discharging socket is used for providing 220V alternating current power supply for users to use;
each vehicle-mounted discharging socket is provided with a discharging enabling switch key, the discharging enabling switch is connected with the HCU through a hard line, if a user presses the discharging enabling switch key, the HCU detection loop is conducted, and the HCU detection loop indicates that the user requests to use the vehicle-mounted discharging socket for discharging at the moment; if the discharging enable switch key is reset and the HCU detection loop is disconnected, the user stops requesting to use the socket at the moment and stops discharging; the HCU communicates with the meters via the CAN bus.
2. The vehicle-mounted high-voltage inversion conversion device according to claim 1, wherein the temperature detection unit is used for detecting the temperature of a radiator mounted on the power device and transmitting a temperature signal T to the main controller.
3. A control method of a vehicle-mounted high-voltage inverter conversion device according to claim 1 or 2, comprising:
s10, when the whole vehicle simultaneously meets the following three conditions: (1) the vehicle-mounted high-voltage inversion conversion device has no fault; (2) the SOC of the high-voltage power battery is more than or equal to 30 percent; (3) when the discharge enabling switch is pressed down by a user, the whole vehicle alternating current discharge function is activated; if any condition is not met, the whole vehicle is prohibited from discharging to the outside;
s20, the HCU sends different discharge request instructions to the vehicle-mounted high-voltage inversion conversion device according to the discharge enabling switch pressed down by the user;
s30, detecting whether the discharge enabling switch is reset or the vehicle-mounted high-voltage inversion conversion device has no fault at all time by the HCU; if the discharge enabling switch is reset at the moment, the HCU sends a discharge stopping request instruction to the vehicle-mounted high-voltage inversion conversion device, and the vehicle-mounted high-voltage inversion conversion device stops discharging outwards after receiving the discharge stopping request instruction of the HCU; finishing the alternating current discharging process;
if the vehicle-mounted high-voltage inversion conversion device fails, the HCU sends failure information to the instrument and displays related failures through the instrument; the HCU sends a discharge stopping request instruction to the vehicle-mounted high-voltage inversion conversion device, and the vehicle-mounted high-voltage inversion conversion device stops discharging outwards after receiving the discharge stopping request instruction of the HCU; and finishing the alternating current discharging process.
4. The control method of the vehicle-mounted high-voltage inversion conversion device according to claim 3, wherein in S20:
if the first discharge enabling switch is pressed down, the HCU sends a discharge request instruction to the vehicle-mounted high-voltage inversion conversion device 16A;
if the second discharge enabling switch is pressed down, the HCU sends a discharge request instruction to the vehicle-mounted high-voltage inversion conversion device 10A;
if the first discharge enabling switch and the second discharge enabling switch are pressed simultaneously, the HCU only sends a discharge request command, and the vehicle-mounted high-voltage inverter conversion device outputs according to the condition that two discharge powers are simultaneously met.
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| CN201810125328.4A CN108429453B (en) | 2018-02-08 | 2018-02-08 | Vehicle-mounted high-voltage inversion conversion device and control method |
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| CN201810125328.4A CN108429453B (en) | 2018-02-08 | 2018-02-08 | Vehicle-mounted high-voltage inversion conversion device and control method |
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| CN108429453B true CN108429453B (en) | 2020-07-17 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109149730B (en) * | 2018-11-12 | 2023-12-22 | 深圳市创世达实业股份有限公司 | Energy storage type inversion mobile power supply and working method thereof |
| CN109802458B (en) * | 2019-01-22 | 2023-04-28 | 重庆长安汽车股份有限公司 | Discharging socket for electric automobile, discharging system, discharging method and automobile |
| CN112019077A (en) * | 2019-05-28 | 2020-12-01 | 湖南工业大学 | Novel single-phase inverter based on buck circuit and control method thereof |
| CN111791746B (en) * | 2020-06-30 | 2023-02-17 | 中国第一汽车股份有限公司 | Flexible battery replacement system and method for vehicle, electronic device and storage medium |
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