CN111953310A

CN111953310A - Filter based on AC charging stake CP signal processing

Info

Publication number: CN111953310A
Application number: CN202010877103.1A
Authority: CN
Inventors: 潘云飞; 曹文伟; 张涛; 仲晶
Original assignee: Jiangsu Wamuke Electronic Technology Co Ltd
Current assignee: Jiangsu Wamuke Electronic Technology Co Ltd
Priority date: 2020-08-27
Filing date: 2020-08-27
Publication date: 2020-11-17

Abstract

The invention relates to the technical field of new energy electric automobiles, and discloses a filter based on CP signal processing of an alternating current charging pile. This electric filter based on alternating-current charging stake CP signal processing, through after the rifle is inserted to the vehicle, can detect connection status through signal module 4, convert the connection condition into optical signal through 485 optical transceiver, then judge through signal module 3, modify the CP signal immediately, detect the PWM signal that feeds back after that, and make the processing, thereby can real-time detection electric automobile the state of charge when charging, and can realize the purpose of controlling and guiding the process of charging through CP signal processing.

Description

Filter based on AC charging stake CP signal processing

Technical Field

The invention relates to the technical field of new energy electric automobiles, in particular to a filter based on CP signal processing of an alternating current charging pile.

Background

With the continuous advance of new energy, new energy electric vehicles gradually enter the visual field of people, the popularization of electric vehicles makes people have strict requirements on the EMC performance of electric component modules of the vehicles in various states, and the good EMC performance is a necessary condition for ensuring that the vehicles can be well charged, started, run and stopped.

CP signals are transmitted in the form of PWM square waves, effective and direct filtering measures are not adopted for processing at present, the traditional signal filter cannot give consideration to the transmission of the PWM signals and the EMC performance of an optical fiber shielding processing block occasion, the PWM waves are easy to distort through the traditional signal filter, and even the signals are not transmitted at all; therefore, the invention provides the filter based on the CP signal processing of the alternating current charging pile, and mainly solves the problems that the CP signal cannot be directly processed by the existing alternating current charging pile and the EMC electromagnetic shielding performance in the CP signal transmission process cannot be ensured.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides the filter based on the CP signal processing of the alternating current charging pile, which has the advantages of CP signal processing and electromagnetic shielding processing of the alternating current charging pile in the charging process of the electric vehicle, and solves the problems of transmission and electromagnetic shielding of the CP signals of the alternating current charging pile and the vehicle mentioned in the background technology.

(II) technical scheme

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a wave filter based on alternating-current charging stake CP signal processing, includes signal filter, signal filter's bottom is provided with the socket, just signal filter's surface is provided with N head, signal filter's left side is provided with the silk screen packing ring, signal filter's left side fixed mounting has flat packing ring of fixation nut, just signal filter's left side fixedly connected with darkroom shield plate, signal filter's left side threaded connection has fixing bolt.

The signal filter internally comprises four signal modules: the device comprises a device A mainboard, a device B mainboard, a device A optical transceiver, a device B optical transceiver and an optical fiber shielding processing block.

The optical fiber shielding processing block comprises a partition plate, a slotted screw and an optical fiber line.

Preferably, the number of the N heads is two, and one side of the N heads close to the signal filter is fixedly installed on the outer surface of the signal filter.

And a mounting groove is formed in the position, corresponding to the N heads, of the outer surface of the signal filter, and the groove wall of the mounting groove is fixedly connected with the side surface of the N heads.

Preferably, the fixing nut is internally provided with a thread groove, and the inner surface of the fixing nut is sleeved with the outer surface of the flat washer.

When the fixing nut is screwed down, the flat washer can prevent the fixing nut from slipping during fixing.

Preferably, the left side of the wire mesh gasket is overlapped with the right side of the fixing bolt, and the right side of the wire mesh gasket is overlapped with the left side of the signal filter.

The wire mesh gasket is internally provided with a tinned copper-clad steel woven structure, so that when the signal filter is fixedly installed on the wall surface of a darkroom, external interference signals of the signal filter are prevented from entering the optical fiber shielding processing block.

Preferably, the number of the flat gaskets is several, and one side of the flat gasket, which is close to the signal filter, is overlapped with the left side of the darkroom shielding plate.

Preferably, the side surface of the optical fiber line is overlapped with the side surface of the slotted screw, and the outer surface of the slotted screw is fixedly connected with the inside of the partition plate.

The left side and the right side of the partition plate are fixedly installed through nuts, flat gaskets and silk screen protective gaskets, and meanwhile, the optical fiber lines and the partition plate are all internal components of the filter.

Compared with the prior art, the invention provides a filter based on CP signal processing of an alternating current charging pile, which has the following beneficial effects:

1. this electric filter based on alternating-current charging stake CP signal processing, through four signal module and the power module that are provided with signal filter, specifically be after the rifle is inserted to the vehicle, can detect connection status through signal module 4, convert the connection condition into optical signal through 485 optical transceiver after that, then judge through signal module 3, modify the CP signal immediately, detect the PWM signal that feeds back immediately, and make and handle, thereby can real-time detection electric automobile the state of charge when charging, and can realize controlling the purpose of the process of charging and guide through CP signal processing, thereby solved the current alternating-current charging stake that mentions among the above-mentioned background art and can not handle the CP signal and can not guarantee the problem of transmission in-process EMC electromagnetic shielding performance.

2. According to the filter based on the CP signal processing of the alternating current charging pile, through devices such as photoelectric conversion devices, core-through capacitors and inductors, specifically, PWM signals are controlled through photoelectric conversion or feedback information is obtained to control charging of an electric automobile, interference signals on a power line can be effectively filtered out through the core-through capacitors when power is input, and a signal module 4 obtains a pure power; and then, the received 485 signal is converted into a PWM signal through the signal module 4 and is output through the inductor L, so that a megawatt interference signal on a transmission signal can be filtered, and the effect of efficient filtering before the CP signal is processed is achieved.

Drawings

FIG. 1 is a schematic view of the installation of the present invention;

FIG. 2 is a schematic diagram of the structure of the optical fiber transmission inside the filter;

FIG. 3 is a cross-sectional view of a charging post plug of the present invention;

FIG. 4 is a connection diagram of the AC charging post and all the connection circuits of the electric vehicle according to the present invention;

FIG. 5 is a diagram of the CP signal transmission structure of the charging pile for vehicle charging according to the present invention;

fig. 6 is a simplified diagram of charging pile car CP signal transmission according to the present invention.

Wherein: 1. a signal filter; 2. an optical fiber shielding processing block; 3. a socket; 4. n heads; 5. a wire mesh gasket; 6. fixing a nut; 7. a flat washer; 8. a darkroom shield plate; 9. fixing the bolt; 10. a partition plate; 11. slotting screws; 12. and (3) an optical fiber line.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-6, a filter based on CP signal processing of an ac charging pile includes a signal filter 1, a socket 3 is disposed at the bottom of the signal filter 1, N heads 4 are disposed on the outer surface of the signal filter 1, a wire mesh washer 5 is disposed on the left side of the signal filter 1, a fixing nut 6 and a flat washer 7 are fixedly mounted on the left side of the signal filter 1, a darkroom shielding plate 8 is fixedly connected to the left side of the signal filter 1, and a fixing bolt 9 is threadedly connected to the left side of the signal filter 1.

The signal filter 1 internally comprises four signal modules: the device comprises a device A mainboard, a device B mainboard, a device A optical transceiver, a device B optical transceiver and an optical fiber shielding processing block 2.

The fiber shielding processing block 2 includes a partition 10, a slotted screw 11, and a fiber line 12.

Through above-mentioned technical scheme, the bottom electricity of signal filter 1 is connected with socket 3, can supply power to whole signal filter 1 through socket 3, and the bottom of signal filter 1 and the mode fixed mounting that passes through screw nut threaded connection on the left side have N head 4 simultaneously, can insert signal filter 1 with the signal that needs to handle from N head 4 of bottom like this, follow left N head 4 and spread out to make things convenient for the signal to transmit in signal filter 1 is inside.

As shown in fig. 3, which is a schematic diagram of an international ac charging pile plug, in the ac charging technology, the charging pile has 7 interfaces: l1, L2, L3, N, PE, CC, CP; wherein L1, L2, L3 and N are power interfaces, and PE is grounded; the CC interface is a charging connection confirmation signal, and the CP is a control pilot signal.

As shown in fig. 4, which is a connection diagram of the ac charging post and all the connection circuits of the electric vehicle according to the present invention, in the electronic optical fiber shielding processing block 2 of the vehicle, L1, L2, L3, N are processed by a three-phase four-wire power filter; PE is directly grounded without processing; the CC interface is processed by a signal filter 1; the CP output is PWM wave, the conventional filter can not meet the requirement of transmitting signals, and no matched filter is available in the market at present, so the invention solves the problem of transmitting CP signals in automobile electronics.

The Pulse Width Modulation (PWM) is based on the principle that the control mode is to control the on-off of the switching element of the inverter circuit, so that a series of pulses with equal amplitude are obtained at the output end, and the pulses are used for replacing sine waves or required waveforms. Namely, a plurality of pulses are generated in a half cycle of an output waveform, so that the equivalent voltage of each pulse is a sine waveform, and the obtained output is smooth and has few low-order harmonics; the width of each pulse is modulated according to a certain rule, so that the magnitude of the output voltage of the inverter circuit can be changed, and the output frequency can also be changed.

As shown in fig. 5, for the transmission structure diagram of the CP signal for charging the vehicle according to the present invention, the transmission of the CP signal is mainly divided into eight steps:

step one, after a vehicle is plugged in a gun, a device mainboard B detects the connection state of the vehicle; the status signal is sent through the 485 interface of the board, (the sending process is that the mainboard sends status data to the optical transceiver B, the optical transceiver transmits the data to the optical transceiver A, and the optical transceiver A sends the data to the device A, wherein the data receiving and sending functions between the optical transceivers AB are completed by the 485 optical transceiver without the intervention of the mainboard, and the same process is also carried out when the mainboard A of the device sends the signal to the device mainboard B.

And the second step, the equipment mainboard A judges the vehicle connection state data from the 485 interface, and immediately modifies the CP signal at the pile end to inform the pile end that the vehicle is connected at the moment (note that the vehicle is in a non-charging state at the moment).

And thirdly, when the pile end detects that the vehicle is in a connection state, generating a corresponding PWM signal on the CP according to the preset power output.

Fourthly, the equipment main board A detects that the pile end has the PWM signal of CP coming, carries out pulse width and period detection on the PWM signal, and sends the detection signal to the equipment main board B

And fifthly, the equipment main board B generates the signal to the vehicle end according to the received PWM signal.

Sixthly, after the vehicle end detects the PWM, the vehicle state is modified into a chargeable state, and the vehicle end feeds back through the PWM signal; then the device motherboard B detects the feedback signal and immediately informs the device motherboard a, and the state of the device motherboard a module is fed back to the stub CP.

And seventhly, after the pile end detects the state, the power output switch is turned on to charge the vehicle, and the state is kept unchanged during charging.

And eighthly, when the charging is required to be finished, analyzing according to factory settings of the charging pile end:

if the pile is a low-power plug-and-play pile, the state of a gun of a vehicle end is detected by the equipment main board B in the situation; if the pile is set to be 'key on/off' no matter the power, the output of the power switch and the output of the PWM signal are firstly closed for the pile end, the state of the pile end is detected by the equipment main board A and is informed to the equipment main board B, and the charging is really finished after the PWM output is closed by the board B.

As shown in fig. 6, which is a simplified transmission diagram of CP signals, a device a motherboard is a signal module 3, a device B motherboard is a signal module 4, a device a optical transceiver (485) is a signal module 1, and a device B optical transceiver (485) is a signal module 2.

The filter is mainly divided into 5 modules, namely a power module, a signal module 1, a signal module 2, a signal module 3 and a signal module 4; the power supply module converts commercial power input into 12VDC voltage and supplies power to the signal module 3 and the signal module 4 respectively; when power is supplied to the signal module 4, in order to prevent interference signals from affecting the signal module 2 and the signal module 4, an input power supply needs to be shielded, in the figure, C1 is a feedthrough capacitor, has the same function as a low-pass filter, is a filter device which is mainly used on a metal panel and is mainly used for inhibiting interference of high-frequency harmonics on signals, power lines and the like, and when the power is input, the interference signals can be effectively filtered out, so that the signal module 4 can obtain a pure power supply; the signal module 1 and the signal module 3 do not need to be shielded, and the signal module 2 and the signal module 4 need to be shielded, namely, the signal module 2 and the signal module 4 are placed in an electromagnetically sealed shell.

The power supply condition of the specific modules is as follows: the signal module 1 is powered by the signal module 3, and the signal module 3 converts the input 12VDC voltage into a 5VDC voltage to power the signal module 1; the signal module 2 is powered by the signal module 4, and the signal module 4 converts the input 12VDC voltage into 5VDC voltage to power the signal module 2.

The PE terminals of the

signal modules

3 and 4 need to be grounded, and they are grounded.

The transmission process of the CP signal is as follows: after the CP signal is input into the signal module 3, the CP signal is transmitted to the N1 interface of the signal module 1 through the N3 interface, at this time, the signal module 3 converts the PWM wave into a 485 signal when playing a role, and the signal module 1 receives the 485 signal; the signal module 1 transmits the received 485 signal to the signal module 2, namely, the P1 is connected with the P2 interface; because the signal module 2 is located in the sealed electromagnetic shell, the optical fiber is adopted for transmission, the optical fiber line 12 needs electromagnetic sealing treatment, that is, the single-mode optical fiber passes through the threaded rod with the groove, and the two ends of the threaded rod are fixed on the partition plate 10 by silk screen, flat gasket and nut, which is specifically shown in fig. 2; the signal module 2 converts the received optical fiber signal into a 485 signal, and transmits the 485 signal to an N4 interface of the signal module through an N2 interface, the signal module 4 converts the received 485 signal into a PWM signal and outputs the PWM signal through an inductor L, and the inductor L is used for filtering some megainterference signals.

The input and output signal connectors of the filter are both N-head 4, and the output end is fixed on the wall through a fastener, as shown in figure 1.

The optical fiber wire 12 can be sealed inside the optical fiber shielding processing block 2 through the sealed slotted screw 11, so that interference of external electromagnetic signals on signals inside the optical fiber wire 12 is avoided.

Specifically, as shown in fig. 1, the number of the N heads 4 is two, and one side of the N heads 4 close to the signal filter 1 is fixedly mounted on the outer surface of the signal filter 1.

Through the technical scheme, the outer surface of the signal filter 1 is provided with the mounting groove at the position corresponding to the N head 4, and the groove wall of the mounting groove is fixedly connected with the side surface of the N head 4.

Specifically, as shown in fig. 1, a thread groove is formed inside the fixing nut 6, and the inner surface of the fixing nut 6 is fitted with the outer surface of the flat washer 7.

Through the technical scheme, when the fixing nut 6 is screwed, the flat washer 7 can prevent the fixing nut 6 from slipping during fixing.

Specifically, as shown in fig. 1, the left side of the wire mesh washer 5 overlaps the right side of the fixing bolt 9, and the right side of the wire mesh washer 5 overlaps the left side of the signal filter 1.

Through above-mentioned technical scheme, 5 inside tinned copper clad steel of wire mesh packing ring are woven the structure, can be when with 1 fixed mounting of signal filter on the darkroom wall, prevent that 1 external interference signal of signal filter from getting into inside the optic fibre shielding processing block to can play the effect of electromagnetic shield's effect.

Specifically, as shown in fig. 1, the number of the flat gaskets 7 is several, and one side of the flat gasket 7 close to the signal filter 1 is overlapped with the left side of the darkroom shielding plate 8.

Specifically, as shown in fig. 2, the side surface of the optical fiber 12 overlaps the side surface of the slotted screw 11, and the outer surface of the slotted screw 11 is fixedly connected to the inside of the partition 10.

Through above-mentioned technical scheme, the left and right sides of baffle 10 carries out fixed mounting through nut, flat pad and silk screen protective washer, and optic fibre line 12 and baffle 10 are the wave filter internals simultaneously, can reach the effect of shielding external electromagnetic interference through the mode of slotted screw 11 parcel optic fibre line 12.

When the device is used, a worker can fix the signal filter 1 on one side of a darkroom shielding plate 8 by screwing the fixing nut 6 on the signal filter 1, then a CP signal to be processed is connected from the N head 4 at the bottom, then the CP signal is processed and the EMC performance is tested through the internal module of the signal filter 1, and then the CP signal is output from the N head 4 at the left side, so that the processes of fixing the position of the signal filter 1, shielding the CP signal and testing the EMC performance can be completed.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A filter based on AC charging stake CP signal processing, includes signal filter (1), its characterized in that: a socket (3) is arranged at the bottom of the signal filter (1), N heads (4) are arranged on the outer surface of the signal filter (1), a wire mesh gasket (5) is arranged on the left side of the signal filter (1), a fixing nut (6) and a flat gasket (7) are fixedly mounted on the left side of the signal filter (1), a darkroom shielding plate (8) is fixedly connected to the left side of the signal filter (1), and a fixing bolt (9) is in threaded connection with the left side of the signal filter (1);

the signal filter (1) comprises four signal modules inside: the device comprises a device A mainboard, a device B mainboard, a device A optical transceiver, a device B optical transceiver and an optical fiber shielding processing block (2);

the optical fiber shielding processing block (2) comprises a partition plate (10), a slotted screw (11) and an optical fiber wire (12).

2. The AC charging post CP signal processing-based filter of claim 1, wherein: the number of the N heads (4) is two, and one side of the N heads (4) close to the signal filter (1) is fixedly installed on the outer surface of the signal filter (1).

3. The AC charging post CP signal processing-based filter of claim 1, wherein: the inner part of the fixing nut (6) is provided with a thread groove, and the inner surface of the fixing nut (6) is sleeved with the outer surface of the flat washer (7).

4. The AC charging post CP signal processing-based filter of claim 1, wherein: the left side of wire mesh packing ring (5) and the right side of fixing bolt (9) overlap joint, just the right side of wire mesh packing ring (5) and the left side of signal filter (1) overlap joint.

5. The AC charging post CP signal processing-based filter of claim 1, wherein: the quantity of plain washer (7) is a plurality of, just one side that plain washer (7) are close to signal filter (1) is lapped mutually with the left side of darkroom shield plate (8).

6. The AC charging post CP signal processing-based filter of claim 1, wherein: the side surface of the optical fiber wire (12) is lapped with the inner side surface of the slotted screw (11), and the outer surface of the slotted screw (11) is fixedly connected with the inner part of the partition plate (10).