CN110406381B - Power battery precharge switching device based on IGBT module - Google Patents
Power battery precharge switching device based on IGBT module Download PDFInfo
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- CN110406381B CN110406381B CN201910821215.2A CN201910821215A CN110406381B CN 110406381 B CN110406381 B CN 110406381B CN 201910821215 A CN201910821215 A CN 201910821215A CN 110406381 B CN110406381 B CN 110406381B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
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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
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- 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
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- 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
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- 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
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- 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
Abstract
The invention discloses a power battery precharge switching device based on an IGBT module, which is used for controlling the on-off of a precharge branch of a power battery, and comprises a low-voltage auxiliary power supply, a microcontroller, a low-voltage control circuit, an isolating switch power supply, a gate electrode driving circuit and an IGBT module; wherein the IGBT module is connected in the precharge branch; the low-voltage auxiliary power supply is connected with the isolating switch power supply through a low-voltage control circuit and is suitable for providing a low-voltage power supply for the isolating switch power supply; the microcontroller is connected with the low-voltage control circuit and is suitable for controlling the on-off of the low-voltage control circuit; the isolating switch power supply is connected with the gate electrode driving circuit; and the gate electrode driving circuit is connected with the IGBT module. The IGBT module is used as the execution switch, so that the real-time performance of the precharge switch action can be enhanced, the requirement on the driving capability of the microcontroller is reduced, the IGBT module has good electromagnetic compatibility, and the IGBT module has the development advantages of miniaturization, low cost and the like.
Description
Technical Field
The invention relates to a power battery precharge switching device based on an IGBT module.
Background
With the continuous development of new energy science and technology, the use of electric automobiles has become more and more popular. Unlike traditional automobile, which uses the internal combustion engine as power source, electric automobile uses electric motor as power source. The motor needs to go through a power-on starting stage before running and working, and because a plurality of large capacitors exist at the input end of the motor, in order to effectively inhibit transient current in the power-on stage of the motor, enhance the electrical safety characteristics of an energy storage system, and effectively control the power-on process of the motor, the most commonly used control method is a pre-charging method. The method is characterized in that in the motor power-on stage, a pre-charging branch comprising a current-limiting resistor is closed, the voltage at the input end of the motor is slowly increased to a preset voltage value, then the pre-charging branch is disconnected, a main loop is connected, and the motor pre-charging process is completed at the moment to enter a normal working state. The precharge process is a stage that must be experienced every time the motor is powered up and started, so whether it can operate effectively has an important impact on the stability and safety of operation of the electric vehicle.
In the traditional method, the high-voltage relay is adopted to switch the on-off state of the pre-charging branch, and the high-voltage relay has good voltage-withstanding insulation property when being disconnected, but has the defects of low response speed, long execution action time delay and the like; the high-voltage relay has higher energy consumption when executing the switching action, most controllers have smaller output current and cannot directly drive the high-voltage relay to execute the switching action, and an auxiliary circuit is additionally added to enhance the driving capability of the high-voltage relay; meanwhile, strong electromagnetic interference is easy to generate in the switching process of the high-voltage relay, and the electromagnetic compatibility is poor; the high-voltage relay is large in size and high in price, and is unfavorable for realizing miniaturization and low-cost improvement of the electric devices when being applied to the battery breaking unit, the distribution box and other parts of the electric automobile.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects of the prior art, and provide the power battery precharge switching device based on the IGBT module, which uses the IGBT module as an execution switch, so that the real-time performance of the precharge switching action can be enhanced, the requirement on the driving capability of a microcontroller is reduced, the device has good electromagnetic compatibility, and the development advantages of miniaturization, low cost and the like are realized.
In order to solve the technical problems, the technical scheme of the invention is as follows: the power battery precharge switching device based on the IGBT module is used for controlling the on-off of a precharge branch of the power battery and comprises a low-voltage auxiliary power supply, a microcontroller, a low-voltage control circuit, an isolating switch power supply, a gate electrode driving circuit and an IGBT module; wherein, the liquid crystal display device comprises a liquid crystal display device,
the IGBT module is connected in the pre-charging branch circuit;
the low-voltage auxiliary power supply is connected with the isolating switch power supply through a low-voltage control circuit and is suitable for providing a low-voltage power supply for the isolating switch power supply;
the microcontroller is connected with the low-voltage control circuit and is suitable for controlling the on-off of the low-voltage control circuit;
the isolating switch power supply is connected with the gate electrode driving circuit and is suitable for converting a low-voltage power supply into a high-voltage power supply to supply power to the gate electrode driving circuit;
the gate electrode driving circuit is connected with the IGBT module and is suitable for converting high-voltage power into driving signals to drive the IGBT module to be conducted so that the pre-charging branch circuit is in a conducting state.
Further, the microcontroller controls the on-off of the low-voltage control circuit based on the digital level signal output by the microcontroller.
Further provided is a specific structure of a low voltage control circuit including:
the MOS tube Q1 is connected between the low-voltage auxiliary power supply and the isolating switch power supply and is suitable for conveying low-voltage power supply output by the low-voltage auxiliary power supply to the isolating switch element;
and the triode Q2 is connected between the microcontroller and the MOS tube Q1 and is suitable for amplifying the current of a control signal output by the microcontroller and converting the signal in opposite phase so as to control the closing or the closing of the MOS tube Q1.
Further, the MOS tube Q1 is an enhanced P-channel MOS tube Q1, a source electrode s of the enhanced P-channel MOS tube is connected with a positive end of a low-voltage auxiliary power supply, a drain electrode d of the enhanced P-channel MOS tube is connected with an input end of an isolating power supply switch, and a negative end of the low-voltage auxiliary power supply is connected with a power supply ground GND;
the triode Q2 is an NPN triode Q2, the base b of the triode Q2 is connected to the control signal output end of the microcontroller through a resistor R3, the collector c of the triode Q2 is connected with the grid g of the MOS tube Q1 through the resistor R2, and the emitter e of the triode Q2 is connected to the power ground GND.
Further, in order to keep the driving voltage between the gate g and the source s of the MOS transistor Q1 stable, the low-voltage control circuit further comprises a resistor R1 and a diode D1, wherein the resistor R1 and the diode D1 are respectively connected in parallel between the gate g and the source s of the MOS transistor Q1, the anode of the diode D1 is connected with the gate g of the MOS transistor, and the cathode of the diode D1 is connected with the source s of the MOS transistor;
and/or to ensure that the transistor Q2 is in an off state when the low voltage control circuit is in an initial state, the low voltage control circuit further comprises a resistor R4 connected between the base b and the emitter e of the transistor Q2.
Further provided is a specific structure of an isolated switching power supply, the isolated switching power supply comprising:
an isolation transformer T1;
the power supply end U of the transformer driver U1 is respectively connected with the output end of the low-voltage control circuit and the middle end of the primary side of the isolation transformer T1, the signal end P of the transformer driver U1 is connected with the upper end of the primary side of the isolation transformer T1, and the signal end N of the transformer driver U1 is connected with the lower end of the primary side of the isolation transformer T1;
the full-bridge circuit is formed by connecting a series circuit formed by a diode D2 and a diode D4 with a series circuit formed by a diode D3 and a diode D5 in parallel, wherein the connection point of the diode D2 and the diode D4 is connected with the upper end of the secondary side of the isolation transformer T1, the connection point of the diode D3 and the diode D5 is connected with the lower end of the secondary side of the isolation transformer T1, the anode parallel end of the diode D3 and the diode D5 is used as an isolated ground ISO_GND of the output of the isolation switch power supply, and the cathode parallel end of the diode D4 and the diode D5 is used as a power end of the output of the isolation switch power supply.
Further, in order to improve transient response capability of the isolating switch power supply, a capacitor C3 is connected in parallel between a power end of the output of the isolating switch power supply and an isolating ground ISO_GND of the output of the isolating switch.
The specific structure of the gate driving circuit is further provided, the gate driving circuit comprises a PNP triode Q3, a TVS tube D6, a resistor R5, a resistor R6 and a resistor R7, and the IGBT module comprises an IGBT transistor; wherein, the liquid crystal display device comprises a liquid crystal display device,
the emitter E of the PNP type triode Q3 is connected to a power supply end of the output of the isolating switch power supply, the base b of the PNP type triode Q3 is connected to the cathode of the TVS tube D6, the anode of the TVS tube D6 is connected with one end of the resistor R5, the other end of the resistor R5 is connected to the isolating ground ISO_GND of the output of the isolating switch power supply, the collector c of the PNP type triode Q3 is connected to the grid G of the IGBT transistor through the resistor R6, and the resistor R7 is connected between the grid G and the emitter E of the IGBT transistor in parallel to serve as a bleeder resistor.
The specific structure of the pre-charging branch circuit is further provided, the pre-charging branch circuit comprises a power battery and a motor load, the positive end of the power battery is connected with the collector C of the IGBT transistor, and the positive end of the motor load is connected with the emitter E of the IGBT transistor through a pre-charging resistor.
After the technical scheme is adopted, the low-voltage control circuit is used for realizing that the microcontroller outputs a digital level signal to control the power supply of the isolating switch power supply; the isolating switch power supply is used for converting the power supply of the low-voltage auxiliary power supply into the power supply of the high-voltage switch device driving circuit; the gate electrode driving circuit is used for converting the output voltage of the isolating switch power supply into signals required by driving the IGBT module, and the invention is mainly applied to a battery breaking unit and a distribution box of an electric automobile, and compared with the existing mode of adopting a high-voltage relay as a precharge switch component, the invention has the following advantages:
(1) The invention can quickly respond to the control signal and quicken the execution rate of the switching action;
(2) The invention has the advantages of small transient power consumption generated by the switching action and good EMI (electromagnetic interference) characteristic;
(3) The IGBT module has small power of control signals required by the IGBT module and has lower requirement on the driving capability of the microcontroller;
(4) The invention has the characteristics of small volume and low cost, and can adapt to the development trend of miniaturization and low cost of the power battery energy storage system.
Drawings
Fig. 1 is a schematic block diagram of a power battery precharge switching apparatus based on an IGBT module of the present invention.
Detailed Description
In order that the invention may be more readily understood, a more particular description of the invention will be rendered by reference to specific embodiments that are illustrated in the appended drawings.
As shown in fig. 1, the power battery precharge switching device based on the IGBT module is used for controlling the on-off of a precharge branch of the power battery, and includes a low-voltage auxiliary power supply, a microcontroller, a low-voltage control circuit, an isolation switch power supply, a gate drive circuit, and an IGBT module; wherein, the liquid crystal display device comprises a liquid crystal display device,
the IGBT module is connected in the pre-charging branch circuit;
the low-voltage auxiliary power supply is connected with the isolating switch power supply through a low-voltage control circuit and is suitable for providing a low-voltage power supply for the isolating switch power supply;
the microcontroller is connected with the low-voltage control circuit and is suitable for controlling the on-off of the low-voltage control circuit;
the isolating switch power supply is connected with the gate electrode driving circuit and is suitable for converting a low-voltage power supply into a high-voltage power supply to supply power to the gate electrode driving circuit;
the gate electrode driving circuit is connected with the IGBT module and is suitable for converting high-voltage power into driving signals to drive the IGBT module to be conducted so that the pre-charging branch circuit is in a conducting state.
Specifically, the microcontroller controls the on-off of the low-voltage control circuit based on the digital level signal output by the microcontroller.
As shown in fig. 1, the low-voltage control circuit mainly comprises an enhancement P-channel MOS transistor Q1, an NPN transistor Q2, a diode D1, a capacitor C1, a resistor R2, a resistor R3, a resistor R4, and other devices. The capacitor C1 is used as a decoupling capacitor and connected between the positive end and the negative end of the low-voltage auxiliary power supply, the positive end of the low-voltage auxiliary power supply is used as a power supply of the whole precharge switching device, and the negative end of the low-voltage auxiliary power supply is used as a power ground GND of the whole precharge switching device; the enhanced P-channel MOS transistor Q1 is used as an executive switching element for conveying the low-voltage auxiliary power supply to the isolating switch power supply, the source electrode s of the enhanced P-channel MOS transistor Q1 is connected with the positive end of the low-voltage auxiliary power supply, and the drain electrode d of the enhanced P-channel MOS transistor Q1 is connected with the input end of the isolating switch power supply; the resistor R1 and the diode D1 are respectively connected in parallel between the source electrode s and the grid electrode g of the enhanced P-channel MOS tube Q1 and are used for keeping the stability of driving voltage between the grid electrode g and the source electrode s of the enhanced P-channel MOS tube Q1 and preventing the P-channel MOS tube Q1 from breakdown failure caused by overhigh driving signal voltage; the NPN triode Q2 is used for amplifying the current of a control signal output by the microcontroller and converting the signal in opposite phase to drive and control the on/off of the enhanced P-channel MOS tube Q1, the collector c and the grid g of the enhanced P-channel MOS tube Q1 are respectively connected with the resistor R2, the base b is connected with the control signal output end of the microcontroller through the resistor R3, and the emitter e is directly connected with the power ground GND; the resistor R4 is connected between the base b and the emitter e of the NPN transistor Q2, and is used for ensuring that the NPN transistor Q2 is in an open circuit state when the entire low voltage control circuit is in an initial state.
In this embodiment, the diode D1 is a zener diode D1.
As shown in fig. 1, the isolation switch power supply mainly comprises a transformer driver U1, an isolation transformer T1, a capacitor C2, a capacitor C3, a diode D2, a diode D3, a diode D4, a diode D5, and other devices. The power supply end U of the transformer driver U1 is connected with the middle end of the primary side of the isolation transformer T1, the power supply end U is also connected with the output end of the low-voltage control circuit, and the capacitor C2 is connected between the power supply end U and the power ground GND and is used for providing decoupling effect for power input; the signal end P of the transformer driver U1 is connected to the upper end of the primary side of the isolation transformer T1, the signal end N of the transformer driver U1 is connected to the lower end of the primary side of the isolation transformer T1, and the signal end P and the signal end N generate PWM signals with the same frequency and opposite phases for driving the isolation transformer T1 to carry out isolation conversion on a power supply; the full-bridge circuit formed by the diode D2, the diode D3, the diode D4 and the diode D5 is matched with the isolation transformer T1 to perform isolation conversion on a power supply on the primary side, wherein the diode D2 and the diode D4 are connected in series and then connected with a diode D3 and a diode D5 in parallel in a series circuit, the connection point of the diode D2 and the diode D4 is connected with the upper end of the secondary side of the isolation transformer T1, the connection point of the diode D3 and the diode D5 is connected with the lower end of the secondary side of the isolation transformer T1, the parallel end of the anode of the diode D2 and the parallel end of the anode of the diode D3 are used as an isolation ground ISO_GND of the output of the isolation switch power supply, and the parallel end of the cathode of the diode D4 and the parallel end of the cathode of the diode D5 are used as a power supply end of the output of the isolation switch power supply; the capacitor C3 is connected in parallel with the output end of the isolating switch power supply and used as a decoupling capacitor, thereby being beneficial to improving the transient response capability of the isolating switch power supply.
In this embodiment, the diode D2, the diode D3, the diode D4, and the diode D5 are all zener diodes.
As shown in fig. 1, the gate driving circuit mainly comprises a PNP transistor Q3, a TVS transistor D6, a resistor R5, a resistor R6, a resistor R7, and other devices, and the IGBT module includes an IGBT transistor; the resistor R6 is connected to the grid G of the IGBT transistor and used for limiting the driving current of the IGBT transistor and preventing the IGBT transistor from being damaged due to overlarge driving current; the resistor R7 is connected in parallel between the grid G and the emitter E of the IGBT transistor and is used as a bleeder resistor, so that the power-down turn-off process of the IGBT transistor is quickened, and the IGBT transistor can be prevented from being invalid due to overvoltage breakdown caused by static charge accumulation; PNP transistor Q3 is used as an executive switch element for transmitting the isolating switch power supply to the grid G of the IGBT transistor, the emitter e of the PNP transistor Q3 is connected with the power supply end of the output of the isolating switch power supply, the collector c of the PNP transistor Q3 is connected with one end of the input resistor R6 of the IGBT transistor, and the base b of the PNP transistor Q3 is connected with the isolating ground ISO_GND through TVS tube D6 and resistor R5; the TVS tube D6 and the resistor R5 form a series circuit, and the series circuit is used for monitoring that the potential b of the base electrode of the triode Q3 reaches the breakdown threshold of the TVS tube D6 to form base electrode current to turn on the triode Q3 and guiding the output voltage of the isolating switch power supply to drive the IGBT transistor; the other end of the resistor R6 is connected to the gate G of the IGBT transistor.
The working process of the hardware circuit related by the invention is specifically expressed as follows:
in the initial stage, the low-voltage auxiliary power supply outputs a power supply voltage, but a control signal output by the microcontroller is in a low level state, the triode Q2 is in an off state without base current, the grid electrode g and the source electrode s of the MOS tube Q1 are both in a high level state, the MOS tube Q1 is also in an off state due to small voltage difference of the grid electrode and the source electrode, the isolating switch power supply is in a shutdown state without voltage input, and the IGBT transistor is in an off state without a driving signal, so that the precharge branch is in the off state;
in the power-on stage of the low-voltage control circuit, the low-voltage auxiliary power supply outputs a power supply voltage, a control signal output by the microcontroller is changed from a low level to a high level state, the triode Q2 obtains a base current and is in an on state, the source electrode s of the MOS tube Q1 still keeps a high level, the grid electrode g is in a low level state due to negative charge injection, and at the moment, the MOS tube Q1 is in an on state due to the rising of the grid source voltage, so that the output voltage of the low-voltage auxiliary power supply is transmitted to the isolating switch power supply, and the isolating switch power supply starts a voltage conversion process;
in the working stage of the isolating switch power supply, the transformer driver U1 starts to work, and the signal end P and the signal N of the transformer driver generate PWM signals with the same frequency and opposite phases; when the signal end P is at a high level, the signal end N is at a low level, at the moment, the output current of the power supply flows from the middle end of the primary side of the isolation transformer T1 to the lower end, the abrupt electromotive force enables the secondary side of the isolation transformer T1 to start outputting the current, the diode D4 and the diode D3 in the full-bridge circuit are conducted, and the capacitor C3 starts to charge; when the signal end P is at a low level, the signal end N is at a high level, at the moment, the output current of the power supply flows to the upper end from the middle end of the primary side of the isolation transformer T1, the abrupt electromotive force enables the isolation transformer T1 to continuously output the current, the diode D5 and the diode D2 in the full-bridge circuit are conducted, and the capacitor C3 is continuously charged; as the capacitor C3 is continuously charged, the output voltage thereof starts to gradually rise, so as to reach the set voltage value and stabilize;
in the power-on stage of the driving signal, when the isolating switch power supply is gradually started, the potential b of the base electrode of the PNP triode Q3 is at a low value and cannot reach the breakdown threshold value of the TVS tube D6, so that the PNP triode Q3 is in a circuit breaking state; the output voltage of the isolating switch power supply gradually rises, the electric potentials of the collector c and the base b of the PNP type triode Q3 rise along with the output voltage, when the electric potential of the base b of the PNP type triode Q3 rises to the breakdown threshold value of the TVS tube D6, the TVS tube D6 starts to break down and short-circuit, and the electric potential of the base b of the PNP type triode Q3 starts to fall to form base current, so that the PNP type triode Q3 starts to be conducted, and obviously, the output voltage of the isolating switch power supply has risen to the highest value of the set voltage and is stabilized at the moment, and the output voltage of the isolating switch power supply is rapidly guided to drive the IGBT transistor after the PNP type triode Q3 is conducted; then, the IGBT transistor gradually becomes a conducting state, and the precharge branch is in a closing state;
in the power-down stage of the driving signal, the low-voltage auxiliary power supply outputs a power supply voltage, the control signal output by the microcontroller is changed from a high level to a low level state, the base current of the NPN triode Q2 disappears and is in a power-off state, the source electrode s of the MOS tube Q1 still keeps high level, the grid electrode g is in a high level state due to negative charge pumping, and at the moment, the MOS tube Q1 is in a power-off state due to the reduction of the grid source voltage, so that the low-voltage auxiliary power supply cuts off a power supply path of the isolating switch power supply, and the isolating switch power supply stops working; along with the shutdown of the isolating switch power supply, the potential b of the base electrode of the PNP triode Q3 starts to gradually decrease and cannot reach the breakdown threshold of the TVS tube D6; at this time, the TVS D6 starts to recover to an off state and cannot provide a base current required for turning on the PNP transistor Q3, the PNP transistor Q3 starts to be in an off state, a path for transmitting a driving signal to the IGBT transistor is cut off, and a voltage signal between the gate G and the emitter E of the IGBT transistor starts to be discharged through the resistor R7 and reduced to zero; eventually the IGBT transistor starts to turn off also causing the precharge branch to be in an off state.
The technical problems, technical solutions and advantageous effects solved by the present invention have been further described in detail in the above-described embodiments, and it should be understood that the above-described embodiments are only illustrative of the present invention and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the scope of protection of the present invention.
In the description of the present invention, it should be understood that the terms "orientation" or "positional relationship" are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and to simplify the description, rather than to indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the description of the present invention, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present invention and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal," "vertical," "overhang," and the like do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the present invention, unless expressly stated or limited otherwise, a first feature may include first and second features directly contacting each other, either above or below a second feature, or through additional features contacting each other, rather than directly contacting each other. Moreover, the first feature being above, over, and on the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being below, beneath, and beneath the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is less level than the second feature.
Claims (9)
1. The power battery precharge switching device based on the IGBT module is used for controlling the on-off of a precharge branch of the power battery and is characterized by comprising a low-voltage auxiliary power supply, a microcontroller, a low-voltage control circuit, an isolating switch power supply, a gate electrode driving circuit and the IGBT module; wherein, the liquid crystal display device comprises a liquid crystal display device,
the IGBT module is connected in the pre-charging branch circuit;
the low-voltage auxiliary power supply is connected with the isolating switch power supply through a low-voltage control circuit and is suitable for providing a low-voltage power supply for the isolating switch power supply;
the microcontroller is connected with the low-voltage control circuit and is suitable for controlling the on-off of the low-voltage control circuit;
the isolating switch power supply is connected with the gate electrode driving circuit and is suitable for converting a low-voltage power supply into a high-voltage power supply to supply power to the gate electrode driving circuit;
the gate electrode driving circuit is connected with the IGBT module and is suitable for converting high-voltage power into driving signals to drive the IGBT module to be conducted so that the pre-charging branch circuit is in a conducting state.
2. The IGBT module-based power cell precharge switching apparatus of claim 1 wherein the microcontroller controls the switching of the low voltage control circuit based on a digital level signal output thereof.
3. The IGBT module-based power cell precharge switching apparatus of claim 2 wherein the low voltage control circuit comprises:
the MOS tube Q1 is connected between the low-voltage auxiliary power supply and the isolating switch power supply and is suitable for conveying low-voltage power supply output by the low-voltage auxiliary power supply to the isolating switch element;
and the triode Q2 is connected between the microcontroller and the MOS tube Q1 and is suitable for amplifying the current of a control signal output by the microcontroller and converting the signal in opposite phase so as to control the closing or the closing of the MOS tube Q1.
4. The IGBT module-based power cell precharge switching apparatus according to claim 3, wherein the MOS transistor Q1 is an enhanced P-channel MOS transistor Q1, a source s thereof is connected to a positive terminal of a low-voltage auxiliary power supply, a drain d thereof is connected to an input terminal of an isolation power switch, and a negative terminal of the low-voltage auxiliary power supply is connected to a power ground GND;
the triode Q2 is an NPN triode Q2, the base b of the triode Q2 is connected to the control signal output end of the microcontroller through a resistor R3, the collector c of the triode Q2 is connected with the grid g of the MOS tube Q1 through the resistor R2, and the emitter e of the triode Q2 is connected to the power ground GND.
5. The IGBT module-based power battery precharge switching apparatus of claim 4 wherein the low voltage control circuit further comprises a resistor R1 and a diode D1, the resistor R1 and the diode D1 being connected in parallel between the gate g and the source s of the MOS transistor Q1, respectively, wherein the anode of the diode D1 is connected to the gate g of the MOS transistor, and the cathode of the diode D1 is connected to the source s of the MOS transistor;
and/or the low voltage control circuit further comprises a resistor R4 connected between the base b and the emitter e of the transistor Q2.
6. The IGBT module-based power cell precharge switching apparatus of claim 1 wherein the isolation switching power supply comprises:
an isolation transformer T1;
the power supply end U of the transformer driver U1 is respectively connected with the output end of the low-voltage control circuit and the middle end of the primary side of the isolation transformer T1, the signal end P of the transformer driver U1 is connected with the upper end of the primary side of the isolation transformer T1, and the signal end N of the transformer driver U1 is connected with the lower end of the primary side of the isolation transformer T1;
the full-bridge circuit is formed by connecting a series circuit formed by a diode D2 and a diode D4 with a series circuit formed by a diode D3 and a diode D5 in parallel, wherein the connection point of the diode D2 and the diode D4 is connected with the upper end of the secondary side of the isolation transformer T1, the connection point of the diode D3 and the diode D5 is connected with the lower end of the secondary side of the isolation transformer T1, the anode parallel end of the diode D3 and the diode D5 is used as an isolated ground ISO_GND of the output of the isolation switch power supply, and the cathode parallel end of the diode D4 and the diode D5 is used as a power end of the output of the isolation switch power supply.
7. The IGBT module-based power cell precharge switching apparatus of claim 6 wherein a capacitor C3 is connected in parallel between the power supply terminal of the isolator power supply output and the isolation ground iso_gnd of the isolator output.
8. The IGBT module-based power cell precharge switching apparatus of claim 6 wherein the gate drive circuit comprises a PNP transistor Q3, a TVS transistor D6, a resistor R5, a resistor R6, and a resistor R7, the IGBT module comprising an IGBT transistor; wherein, the liquid crystal display device comprises a liquid crystal display device,
the emitter E of the PNP type triode Q3 is connected to a power supply end of the output of the isolating switch power supply, the base b of the PNP type triode Q3 is connected to the cathode of the TVS tube D6, the anode of the TVS tube D6 is connected with one end of the resistor R5, the other end of the resistor R5 is connected to the isolating ground ISO_GND of the output of the isolating switch power supply, the collector c of the PNP type triode Q3 is connected to the grid G of the IGBT transistor through the resistor R6, and the resistor R7 is connected between the grid G and the emitter E of the IGBT transistor in parallel to serve as a bleeder resistor.
9. The IGBT module-based power cell precharge switching arrangement of claim 8 wherein the precharge branch comprises a power cell and a motor load, the power cell positive terminal being connected to the collector C of the IGBT transistor, the motor load positive terminal being connected to the emitter E of the IGBT transistor through a precharge resistor.
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| CN201910821215.2A CN110406381B (en) | 2019-09-02 | 2019-09-02 | Power battery precharge switching device based on IGBT module |
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| CN110417394A (en) * | 2019-09-04 | 2019-11-05 | 常州索维尔电子科技有限公司 | Power battery high-tension switch gear based on MOSFET |
| CN110829818A (en) * | 2019-11-18 | 2020-02-21 | 广东美的暖通设备有限公司 | Power supply circuit, control method and device of power supply circuit and air conditioner |
| CN110829817B (en) * | 2019-11-18 | 2022-02-11 | 广东美的暖通设备有限公司 | Control circuit, control method and device of control circuit and air conditioner |
| CN111614237B (en) * | 2020-06-17 | 2022-03-08 | 东风汽车有限公司 | Pre-charging circuit, power distribution device and electric automobile |
| CN111864718A (en) * | 2020-08-14 | 2020-10-30 | 精进电动科技股份有限公司 | Anti-reverse connection circuit, electronic parking circuit and control method |
| CN115148243A (en) * | 2021-03-31 | 2022-10-04 | 长鑫存储技术有限公司 | Memory circuit, control method and equipment for memory pre-charging |
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| JP3950263B2 (en) * | 1999-06-09 | 2007-07-25 | 中国電力株式会社 | Motor drive power converter |
| US7555912B2 (en) * | 2005-03-01 | 2009-07-07 | York International Corporation | System for precharging a DC link in a variable speed drive |
| JP5627264B2 (en) * | 2010-03-27 | 2014-11-19 | 三洋電機株式会社 | Power supply device for vehicle and vehicle equipped with this power supply device |
| CN103441540B (en) * | 2013-08-12 | 2018-08-21 | 西安睿诺新能源有限公司 | A kind of onboard power storage battery group charger circuit based on copped wave |
| CN109823180B (en) * | 2017-11-22 | 2022-04-26 | 上海汽车集团股份有限公司 | Pre-charging circuit of power battery |
| CN210652697U (en) * | 2019-09-02 | 2020-06-02 | 常州索维尔电子科技有限公司 | Power battery pre-charging switch device based on IGBT module |
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