CN207705759U

CN207705759U - The detection and protective device that a kind of electric vehicle wireless charging load end disappears

Info

Publication number: CN207705759U
Application number: CN201820130112.2U
Authority: CN
Inventors: 龙晓秘; 邓其军
Original assignee: Wuhan University WHU
Current assignee: Wuhan University WHU
Priority date: 2018-01-24
Filing date: 2018-01-24
Publication date: 2018-08-07
Anticipated expiration: 2028-01-24

Abstract

The utility model patent discloses detection and the protective device of a kind of wireless charging load end state, including FPGA module, Driven by inverter module, inverter module, current sensor module, load end module, signal pre-processing module, first voltage comparator module, rectification module, second voltage comparator module；Compared with prior art, the utility model can be when load end charges abnormal, timely trigger protection action, stops inverter output, safety of the protection main circuit under abnormal work scene.

Description

The detection and protective device that a kind of electric vehicle wireless charging load end disappears

Technical field

The utility model belongs to electric vehicle wireless charging technical field, and it is negative to relate generally to a kind of electric vehicle wireless charging Carry the detection and protective device that end disappears.

Background technology

Electric vehicle wireless charging technical definition：It is by being embedded in the power supply coil in underground with the shape of high-frequency alternating magnetic field Electric energy is transferred to operation a certain range of vehicle receiving terminal pick up mechanism on the ground by formula, and then is set to vehicle-mounted energy storage Available electricity, can make electric vehicle carry a small amount of battery pack, extend its course continuation mileage, while electric energy supply is more safely, conveniently.Electricity Electrical automobile wireless charging technology has many advantages, such as that operational safety is convenient flexibly, maintenance cost is low, user experience is good, by increasingly More concerns.

Currently to the research work of wireless charging system for electric automobile, the power, more for how realizing bigger focused primarily upon Compensation topology structure well, more preferably control performance, lower electromagnetic leakage problem etc..Although hoisting power, controlling The research of energy, magnetic dispersion etc. is to pushing wireless charging system for electric automobile to play an important role, but wireless charging system Circuit protection problem not obtain when enough attention, especially high-power output its protection problem especially prominent.It is filling In electric process, do not received by transmitting terminal if not sent out when vehicle leaves for some reason and stopping charging instruction or the instruction, Then there is the problems such as inverter overcurrent or the imbalance of zero voltage operation state can occur in pole, to cause inverter to damage.Receiving terminal For some reason short circuit or open circuit when, the equivalent series resistance that receiving terminal is reflected into transmitting terminal is zero, may also can equally cause overcurrent or Person ZVS lacks of proper care and inverter is caused to damage.These described scenes can actually be attributed to the disappearance of receiving-end impedance.

It is badly in need of a set of circuit system that can detect receiving-end impedance disappearance in real time and its guard method currently on the market, Cut-out inverter is to protect main circuit when detecting above-mentioned abnormal generation.The utility model is to pushing electric vehicle wireless charging system The development of system plays an important role.

Utility model content

To solve the above-mentioned problems, the utility model provides a kind of detection that electric vehicle wireless charging load end disappears With protective device.

The utility model the technical scheme adopted is that a kind of electric vehicle wireless charging load end disappear detection and guarantor Protection unit, it is characterised in that：Including FPGA module, Driven by inverter module, inverter module, current sensor module, load End module, signal pre-processing module, first voltage comparator module, rectification module, second voltage comparator module；

The FPGA module, Driven by inverter module, inverter module, current sensor module, load end module are logical Conducting wire is crossed to be sequentially connected in series；The current sensor module, signal pre-processing module, first voltage comparator module, FPGA module is sequentially connected in series by conducting wire；The signal pre-processing module, rectification module, second voltage comparator mould Block, FPGA module are sequentially connected in series by conducting wire.

Preferably, the FPGA module controls signal for generating SPWM, for calculating the first voltage comparator The square wave load current signal of output, the exception-triggered signal for monitoring the second voltage comparator module output, according to Square wave load current signal, SPWM control signals and exception-triggered signal analyze the load end module status, if square wave is negative Current signal and SPWM control signals are carried by FPGA phase analysis modules obtain phase angle less than first phase threshold value Utility model device is in ZVS de-synchronization states and load disappears, if phase angle is more than this practicality known to second phase threshold value newly Type device is in ZVS saturation states and load disappears, if exception-triggered signal, which generates, understands that utility model device is in overcurrent State and load disappearance, the FPGA module are analyzed to obtain load and disappear then to stop generating SPWM control signals to protect described bear Carry end module；The Driven by inverter module is for providing SPWM control signal driving currents；The inverter module is used for root Signal is controlled by DC inverter into AC load electric current according to SPWM；The current sensor module is for measuring the load end The AC load current signal of module；The signal pre-processing module is for being filtered and amplifying to AC load current signal Processing；The first voltage comparator module is used to obtain AC load current signal progress zero passage detection and AC load electricity Flow the square wave load current signal of signal identical frequency；The rectification module is for obtaining AC load current signal by rectification To DC load current signal；The second voltage comparator is for relatively obtaining DC load current signal with threshold signal Exception-triggered signal.

Compared with prior art, the utility model vehicle when not stopping charging leaves, receives terminal shortcircuit or open circuit, reception Start under charging scenarios in the absence of end, trigger protection can act in time, stop inverter output and DC power supply output, preferably Ground protects safety of the main circuit under abnormal work scene.

Description of the drawings

Fig. 1：The circuit system structure chart of the utility model embodiment；

Fig. 2：The detection of the utility model and protection schematic diagram of a scenario.

Specific implementation mode

The utility model is understood and implemented for the ease of those of ordinary skill in the art, it is right with reference to the accompanying drawings and embodiments The utility model is described in further detail, it should be understood that implementation example described herein is only used for describing and explaining this Utility model is not used to limit the utility model.

Existing deficiency is monitored for existing route device, the utility model patent devises a kind of electric vehicle wireless charging Load end disappearance detection and protective device.Utility model device be applicable to because ZVS de-synchronization states, ZVS saturation states and Over-current state leads to the scene that load disappears.

Referring to Fig.1, detection and the protective device of a kind of electric vehicle wireless charging load end disappearance, including FPGA module, Driven by inverter module, inverter module, current sensor module, load end module, signal pre-processing module, first voltage ratio Compared with device module, rectification module, second voltage comparator module；The FPGA module, Driven by inverter module, inverter mould Block, current sensor module, load end module are sequentially connected in series by conducting wire；The current sensor module, signal are pre- Processing module, first voltage comparator module, FPGA module are sequentially connected in series by conducting wire；The Signal Pretreatment mould Block, rectification module, second voltage comparator module, FPGA module are sequentially connected in series by conducting wire.

Fig. 2 is the detection and protection schematic diagram of a scenario of the utility model.If the square wave load current signal and described SPWM controls signal and obtains phase angle less than first phase threshold value and first phase threshold value by the FPGA phase analysis module It it is 9 °, it is known that utility model device is in ZVS de-synchronization states and load disappears；If phase angle is more than second phase threshold value and the Two phase threshold value is 50 ° and understands that utility model device is in ZVS saturation states and load disappears；If the exception-triggered signal Utility model device known to generating is in over-current state and load disappears, and the FPGA module is analyzed to obtain load and disappear then to stop It only generates SPWM and controls signal to protect the load end module.

The FPGA module selects XC6SLX9-3TQG144I chips；The inverter module uses 6 half-bridge inverters Composition, each half bridge arm use two panels switch mosfet pipe and model IPW60R041C6；The current sensor module uses LP55A；The first voltage comparator module and second voltage comparator module are all made of TS3011 chips；The signal is pre- Processing module uses LM7171 chips；The rectification module uses BAS40 diodes.

In conjunction with Fig. 2, the embodiments of the present invention are elaborated.The FPGA module is for generating SPWM control signals； The Driven by inverter module is for providing SPWM control signal driving currents；The inverter module according to SPWM for controlling Signal is by DC inverter at AC load electric current；The current sensor module is used to measure the exchange of the load end module Load current signal；The AC load electric current is transferred to load (R by the load end module by electromagnetic induction_L)；It is described Signal pre-processing module is used to be filtered AC load current signal and enhanced processing；The first voltage comparator module For obtaining AC load current signal progress zero passage detection to load electricity with the square wave of AC load current signal identical frequency Flow signal；The rectification module is used to AC load current signal obtaining DC load current signal by rectification；Described Two voltage comparators are used to DC load current signal and threshold signal relatively obtaining exception-triggered signal；The FPGA module The square wave load current signal of the first voltage comparator output is calculated, it is defeated for monitoring the second voltage comparator module The exception-triggered signal gone out, if the square wave load current signal and SPWM control signals pass through the FPGA phases point Analysis module obtains phase angle to be less than first phase threshold value and first phase threshold value being 9 °, it is known that utility model device is in ZVS De-synchronization state and load disappearance；If phase angle is more than second phase threshold value and second phase threshold value is the utility model known to 50 ° Device is in ZVS saturation states and load disappears；If the exception-triggered signal, which generates, understands that utility model device was in Stream mode and load disappears, the FPGA module analyze to obtain load and disappear that then to stop generating SPWM control signals described to protect Load end module.

Although this specification has more used FPGA module, Driven by inverter module, inverter module, current sensor Module, load end module, signal pre-processing module, first voltage comparator module, rectification module, second voltage comparator module Equal terms, but the possibility using other terms is not precluded.The use of these items is only for more easily describe this reality With novel essence, it is contrary to the spirit of the present invention to interpret them as any one of the additional limitations.

It should be understood that the part that this specification does not elaborate belongs to the prior art.

It should be understood that the above-mentioned description for preferred embodiment is more detailed, can not therefore be considered to this The limitation of utility model patent protection domain, those skilled in the art are not departing under the enlightenment of the utility model Under the ambit that the utility model claims are protected, replacement or deformation can also be made, the utility model is each fallen within Within protection domain, the utility model is claimed range and should be determined by the appended claims.

Claims

1. detection and protective device that a kind of electric vehicle wireless charging load end disappears, including FPGA module, Driven by inverter Module, inverter module, current sensor module, load end module, signal pre-processing module, first voltage comparator module, Rectification module, second voltage comparator module；

The FPGA module, Driven by inverter module, inverter module, current sensor module, load end module are by leading Line is sequentially connected in series；The current sensor module, signal pre-processing module, first voltage comparator module, FPGA moulds Block is sequentially connected in series by conducting wire；The signal pre-processing module, rectification module, second voltage comparator module, FPGA Module is sequentially connected in series by conducting wire.

2. detection and protective device, feature that electric vehicle wireless charging load end according to claim 1 disappears exist In：The FPGA module is for generating SPWM control signals, the square wave load for calculating the first voltage comparator output Current signal, the exception-triggered signal for monitoring the second voltage comparator module output, believes according to square wave load current Number, SPWM control signals and exception-triggered signal analyze the load end module status, if square wave load current signal and SPWM controls signal and obtains phase angle less than utility model device known to first phase threshold value by FPGA phase analysis modules In ZVS de-synchronization states and load disappearance, if phase angle is more than utility model device known to second phase threshold value and satisfies in ZVS With state and load disappearance, disappear if utility model device known to the generation of exception-triggered signal is in over-current state and loads, The FPGA module is analyzed to obtain load and disappear then to stop generating SPWM control signals to protect the load end module；It is described inverse Become device drive module for providing SPWM control signal driving currents；The inverter module is used to control signal according to SPWM will DC inverter is at AC load electric current；The current sensor module is used to measure the AC load electricity of the load end module Flow signal；The signal pre-processing module is used to be filtered AC load current signal and enhanced processing；First electricity Pressure comparator module is used to obtain AC load current signal progress zero passage detection and AC load current signal identical frequency Square wave load current signal；The rectification module is used to AC load current signal obtaining DC load current by rectification Signal；The second voltage comparator is used to DC load current signal and threshold signal relatively obtaining exception-triggered signal.