CN217587405U

CN217587405U - Detection circuit for alternating current charging control guide signal of electric automobile

Info

Publication number: CN217587405U
Application number: CN202122669338.4U
Authority: CN
Inventors: 彭建华; 潘继雄; 周幼华
Original assignee: Shenzhen Yujiaocheng Technology Co ltd
Current assignee: Shenzhen Yujiaocheng Technology Co ltd
Priority date: 2021-11-03
Filing date: 2021-11-03
Publication date: 2022-10-14
Anticipated expiration: 2031-11-03

Abstract

The utility model relates to an automatically controlled technical field of new forms of energy discloses an electric automobile alternating current charging control pilot signal's detection circuitry, to electric automobile alternating current charging reliability and the not good enough problem of stability on the existing market, provides an alternating current charging control pilot signal's detection circuitry, through preferred electronic components and ingenious circuit design, has improved CC and CP signal sampling precision, has greatly promoted alternating current charging reliability and stability. And simultaneously, the utility model discloses having drawn forth switch S2' S shorting stub in detection circuitry, when using as the equipment debugging or emergent when charging the use, can directly link the software control logic that avoids switch S2 with shorting stub and signal ground, make things convenient for the scene to use in a flexible way. Additionally, the utility model discloses can also realize the CP signal and awaken the function that the electricity and delay were fallen the electricity on the activation vehicle-mounted controller low pressure, when the vehicle-mounted controller lost or cut off the power supply because of external activation signal accident, accessible CPU control logic reached the purpose that the delay was fallen the electricity and data are preserved.

Description

Detection circuit for alternating current charging control guide signal of electric automobile

Technical Field

The utility model relates to an automatically controlled technical field of new forms of energy, in particular to electric automobile exchanges detection circuitry of charging control pilot signal.

Background

Under the big background of global energy crisis and serious environmental crisis, the application and development of new energy automobiles are actively promoted by the government of China, the electric automobiles are used as green vehicles with wide development prospect, the popularization speed in future is extremely rapid, the market prospect in future is extremely huge, and the charging piles are used as important matched charging infrastructures necessary for developing the electric automobiles, so that the charging piles have very important social benefits and economic benefits.

The charging pile is used as an energy supply device of the electric automobile and is divided into an alternating current charging pile and a direct current charging pile, the charging power of the direct current charging pile is high, the requirement for power supply is high, a circuit and a transformer need to be arranged in advance, the alternating current charging pile is generally built in a special charging (converting) station, the alternating current charging pile is just opposite to the direct current charging pile, the alternating current charging pile is used for supplying power from a 220VAC single-phase alternating current power supply of a public power grid, the maximum charging power is generally not more than 7KW, the mounting conditions are met in general communities and building office places, and even if a plurality of alternating current charging piles are additionally mounted, industrial electricity and domestic electricity in peripheral areas cannot be influenced.

Different from the blind charging mode of the electric two-wheeled vehicle on the low-end market, the charging process of the electric vehicle needs to control a guide signal to confirm the connection of the charging device and judge the rated current parameter, and communication links and interaction between the two parties are established on the basis of the judgment, and the whole charging process is continued. The recognition of the charging control pilot signal is a key for successful handshake between the charging device and the vehicle-mounted control device, and is a precondition for normal start of a charging process. Therefore, the detection of the charging control pilot signal is an important working link of the vehicle-mounted control device, and the charging safety of the electric vehicle is not ignored.

According to the national standard for vehicle-mounted conduction charging GB/T18487.1-2015 conduction charging system for electric vehicles, part 1: the provision in general requirements that the ac charging requires detection of charging control pilot signals CC and CP, CC reflecting the vehicle interface connection status and the rated capacity of the connection cable, transmitted to the on-board control device as a resistance signal; the CP is used for monitoring the interaction function between the electric automobile and the power supply equipment, reflects the maximum power supply capacity of the current power supply equipment, and transmits a constant voltage or voltage pulse signal to the vehicle-mounted control device; the vehicle-mounted control device is responsible for detecting the CC and the CP, the vehicle-mounted control device CAN be a Battery Management System (BMS) or a vehicle-mounted charger (OBC) according to the control logic of the whole vehicle, the CC and CP signals detected by the BMS belong to the mainstream method at present, after the charging control guide signal detection is finished, the electric vehicle and the alternating current charging pile start to establish a CAN communication link relationship and enter a charging process, and fig. 1 is a block diagram of alternating current charging electrical conduction and communication link relationship.

At present, the detection circuit for alternating charging control guide signals CC and CP in the market is eight-gate, which can not be enumerated, and realizes no two functions: firstly, detecting a CC resistor, a CP voltage and a pulse waveform duty ratio; secondly, the CC and CP signals wake up the activation of the onboard control devices (mainly BMS). However, with the recent blowout development of electric vehicles and the production and sales volume of section climbing, poor charging reliability and stability are gradually exposed in wide practical applications, and one of the reasons for this is that the detection accuracy of the charging control pilot signals CC and CP is not high, which leads to erroneous judgment and charging failure.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an electric automobile exchanges detection circuitry of charging control pilot signal aims at improving CC and CP signal sampling precision, promotes the reliability and the stability that exchange charges.

In order to achieve the above object, the utility model provides a detection circuit for AC charging control guide signal of an electric vehicle, which comprises a CP detection circuit, wherein the CP detection circuit comprises an operational amplifier U1, diodes D1-D4, a MOS tube Q1, triodes Q2-Q3, fuses F1-F2, resistors R1-R14, capacitors C1-C3, a signal input end CP to be detected, a pulse signal output end DI-CP, a CP power supply wake-up signal output end CP-PWM, a switch S2 control signal input end CTR-CP, and a switch S2 short-circuit signal input end S2-Jper, the signal input end CP to be detected, the diodes D1, the fuses F1, the diodes D3, the resistors R4, the resistors R5, the triodes Q3 and the CP power supply wake-up signal output end CP-PWM are sequentially connected in series and electrically, two ends of the resistor R9 are respectively connected with the output end of the diode D3 and the inverted input end of the operational amplifier U1, one end of the resistor R11 and one end of the resistor R12 are respectively and electrically connected with the in-phase input end of the operational amplifier U1, the other end of the resistor R11 is electrically connected with a signal ground GND, the other end of the resistor R12 is electrically connected with a power supply D5V, two ends of the capacitor C2 are respectively and electrically connected with the resistor R12 and the signal ground GND, two ends of the resistor R10 are respectively and electrically connected with the inverting input end of the operational amplifier U1 and the signal ground GND, two ends of the resistor R14 and the capacitor C3 are respectively and electrically connected with the pulse signal output end DI-CP and the signal ground GND, two ends of the diode D2 and the resistor R1 are respectively and electrically connected with the input end of the diode D3 and the signal ground GND, two ends of the capacitor C1 are respectively and electrically connected with the resistor R4 and the signal ground GND, one end of the resistor R6 and the input end of the diode D4 are respectively and electrically connected with the signal ground, the other end of the resistor R6 and the output end of the diode D4 are respectively and electrically connected with the triode Q3, the input end of the diode D3, the resistor R2, the fuse F2 and the short-circuit signal input end S2-Jper of the switch S2 are sequentially and serially connected, the resistor R2, the MOS tube Q1 and the emitting electrode of the triode Q2 are sequentially and serially connected, the base electrode of the triode Q2, the resistor R8 and the control signal input end CTR-CP of the switch S2 are sequentially and serially connected, the collector electrode of the triode Q2, the resistor R7 and the power supply D5V are sequentially and serially connected, one ends of the MOS tube Q1 and the resistor R3 are respectively and electrically connected with a signal ground GND, and the other end of the resistor R3 is electrically connected with the emitting electrode of the triode Q2;

the CC detection circuit comprises an operational amplifier U2, resistors R21-R23, capacitors C12-C14, diodes D12-D13, a signal input end CC to be detected and a signal output end AI-CC, wherein the signal input end CC to be detected, the diode D12 and the non-inverting input end of the operational amplifier U2 are sequentially and electrically connected in series, the inverting input end of the operational amplifier U2 is electrically connected with the output end, the output end of the operational amplifier U2, the resistor R23 and the signal output end AI-CC are sequentially and electrically connected in series, two ends of the capacitors C13, R22 and D13 are respectively and electrically connected with the non-inverting input end of the operational amplifier U2 and a signal ground GND, the non-inverting input end of the operational amplifier U2, the resistor R21, the capacitor C12 and the signal ground GND are sequentially and electrically connected in series, one end of the resistor R21 is electrically connected with a power supply D5V, and two ends of the capacitor C14 are respectively and electrically connected with the signal ground GND and the signal output end AI-CC;

the CP awakening and activating power circuit comprises a positive electrode terminal BAT-P of a lead-acid storage battery, a negative electrode terminal GND of the lead-acid storage battery, capacitors C4-C11, diodes D5-D11, an inductor L1, resistors R15-R20, a fuse F3, an MOS tube Q4, triodes Q5-Q6, a DC/DC power chip, a key switch ON gear signal input end, an OBC auxiliary power input end CHG-AC, a direct current charging pile auxiliary power input end CHG-DC and a time DELAY control input end DELAY-OFF, wherein the positive electrode terminal BAT-P of the lead-acid storage battery, the fuse F3, the MOS tube Q4, a resistor R16, the inductor L1, the DC/DC power chip and a power D5V are sequentially connected in series, the negative electrode terminal GND of the lead-acid storage battery is electrically connected with a signal ground, two equal ends of the capacitors C4 and C5 are respectively electrically connected with the MOS tube Q4 and the signal ground, the negative pole GND of the lead-acid battery is electrically connected with one end of a capacitor C4, the two ends of capacitors C6-C10 and a diode D6 are equally connected with the input end of a DC/DC power chip in parallel, the capacitors C6-C10, the diode D6 and the DC/DC power chip are equally connected with the GND of a signal ground, an MOS tube Q4, a resistor R19 and a CP power wake-up signal output end CP-PWM are sequentially and serially and electrically connected, the ON gear signal input end of a key switch, the CHG-AC of an OBC auxiliary power input end and the CHG-DC of a direct current charging pile are respectively and electrically connected with the input ends of diodes D7, D8 and D9, the output ends of the diodes D7, D8 and D9 are equally connected with a resistor R17, the resistor R17 is connected with the base of a triode Q5, the collecting electrodes of the triodes Q5 and Q6 are equally connected with one end of the resistor R19, the base of triode Q6, resistance R20 and DELAY control input terminal DELAY-OFF are connected in series in proper order, resistance R18 and diode D10's both ends are equallyd divide and are connected with triode Q5's base and projecting pole electricity respectively, just resistance R18, diode D10 and triode Q5's projecting pole is equallyd divide and is connected with signal ground GND electricity respectively, diode D11 and electric capacity C11's both ends are equallyd divide respectively with triode Q6's base and projecting pole electricity and are connected, just diode D11, electric capacity C11 and triode Q6's projecting pole is equallyd divide and is connected with signal ground GND electricity respectively.

Further, when the control signal input end CTR-CP of the switch S2 inputs a high level, the MOS transistor Q1 is switched on, and when the control signal input end CTR-CP of the switch S2 inputs a low level, the MOS transistor Q1 is switched off.

Furthermore, the pulse signal output end DI-CP and the switch S2 control signal input end CTR-CP are respectively and electrically connected with an I/O pin of the vehicle-mounted controller CPU.

Further, the signal output end AI-CC is electrically connected with an A/D pin of a vehicle-mounted controller CPU.

Further, the DC/DC power supply chip adopts a BUCK type DC/DC power supply chip.

Adopt the technical scheme of the utility model, following beneficial effect has:

1. the AC charging control guide signal detection circuit provided by the utility model can realize the accurate detection of CC and CP signals, and avoid the problems of reliability and stability in AC charging;

2. the utility model provides an exchange charge control pilot signal detection circuitry can realize CP signal awakens the function that activates on-vehicle controller low pressure electricity and delay the power failure, when on-vehicle controller loses or cuts off the power supply because of external activation signal accident, can reach the purpose of delay power failure and data storage through CPU control logic;

3. the utility model provides a short-circuit wire of switch S2 has been drawn forth to the control pilot signal detection circuitry that charges alternately, can avoid switch S2' S software control logic, and the convenience is used when debugging or emergent charging.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a block diagram of an AC charging electrical conduction and communication link;

fig. 2 is a schematic diagram of a CP detection circuit of a detection circuit for ac charging control pilot signals of an electric vehicle according to the present invention;

fig. 3 is a schematic diagram of a CC detection circuit of a detection circuit for ac charging control pilot signals of an electric vehicle according to the present invention;

fig. 4 is a schematic diagram of a CP wake-up activation power circuit of a detection circuit for an ac charging control pilot signal of an electric vehicle according to the present invention;

fig. 5 is the utility model provides an electric automobile exchanges all electronic components parameter specification of charging control pilot signal's detection circuitry.

The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that all the directional indicators (such as upper, lower, left, right, front, and rear … …) in the embodiments of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.

In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

The utility model provides an electric automobile alternating current charging control pilot signal's detection circuitry.

As shown in fig. 2 to fig. 5, in an embodiment of the present invention, the detection circuit of the ac charging control pilot signal of the electric vehicle includes a CP detection circuit, a CC detection circuit, and a CP wake-up activation power circuit.

As shown in fig. 2, the ac charging control pilot signal CP detection circuit is composed of an operational amplifier U1, diodes D1 to D4, triodes Q2 to Q3, an MOS transistor Q1, fuses F1 to F2, resistors R1 to R14, capacitors C1 to C3, and the like. CP is the signal input to be detected; the DI-CP is pulse signal output after shaping and level conversion, and directly enters an I/O pin of the CPU for sampling; CP-PWM is the CP power supply wake-up signal output, acts on the power part of the vehicle-mounted controller; the CTR-CP is the control signal input of a switch S2 (simulated by a MOS tube Q1); and S2-Jper is a short-circuit signal line of the switch S2 and is used for debugging or emergency use.

The diodes D1 and D3 are used for signal isolation; the fuse F1 and the TVS tube D2 are used for front-end overcurrent protection and overvoltage protection; resistors R1 and R2 and an MOS tube Q1 are arranged according to the vehicular conduction charging national standard GB/T18487.1-2015 electric vehicle conduction charging system part 1: the rule of an appendix A control guide circuit schematic diagram in the general requirements is set, the voltage amplitude of a detection point 1 and a detection point 2 is changed through the connection state of a vehicle interface and the control of a switch S2, and then the charging process is guided to be carried out; the resistors R3, R7 and R8 and the triode Q2 are a driving circuit of the MOS transistor Q1, an I/O pin of the CPU is directly connected to a CTR-CP end, the CTR-CP end is controlled by software, the MOS transistor Q1 is switched on when a high level is input, and the MOS transistor Q1 is switched off when a low level is input; S2-Jper is a short-circuit signal line of the switch S2, if the S2-Jper lead is directly short-circuited to a signal ground GND, the control logic of the switch S2 is equivalently avoided, S2 forced closing is simulated, and the emergency charging circuit can be used for debugging or emergency charging.

The operational amplifier U1, the resistors R9-R14 and the capacitors C2-C3 jointly form a shaping filter circuit of the CP pulse signal, the operational amplifier U1 is the core of a comparator, the CP pulse signal with the amplitude of 12Vdc is shaped into the CP pulse signal with the amplitude of 5Vdc, and then the CP pulse signal enters an I/O pin of a CPU for sampling; the resistors R4-R6, the capacitor C1, the diode D4 and the triode Q3 jointly form CP awakening activation signal output, and the CP awakening activation signal enters the power supply part to awaken the vehicle-mounted controller to be electrified at low voltage.

As shown in fig. 3, the ac charging control pilot signal CC detection circuit is composed of an operational amplifier U2, resistors R21 to R23, capacitors C12 to C14, diodes D12 and D13, and the like. CC is a signal input to be detected; and the AI-CC is output after signal conditioning and directly enters an A/D pin of the CPU for sampling. The resistors R21 and R22 form a signal input voltage division conditioning circuit; the operational amplifier U2 is an emitter follower, has the function of enhancing the rear-end loading capacity, and selects the operational amplifier with low offset voltage, low bias current and low noise as much as possible in order to improve the sampling precision; the diodes D12 and D13 are used for protecting the safety of the input pin of the operational amplifier; the resistor R23 and the capacitor C14 are low-pass filters for filtering out high-frequency noise and interference.

As shown in fig. 4, the main function of the ac charging control pilot signal CP to wake up and activate the power supply circuit is to realize dc conversion from a 12Vdc or 24Vdc power supply to a 5Vdc power supply of the vehicle-mounted lead-acid battery, and to provide a working power supply for the CPU control circuit, the signal conditioning circuit, the communication circuit, the signal detection circuit, and the like. Generally speaking, a power supply loop of an ON-board controller is directly connected to two poles of a positive (BAT-P) and a negative (GND) of a lead-acid battery, but at least one of an ON-gear signal of a key switch, an OBC auxiliary power supply CHG-AC signal and a direct current charging pile auxiliary power supply CHG-DC signal needs to be activated and awakened to be powered ON for work, and besides, in an alternating current conduction charging process, the ON-board controller needs to be compatible with a CC or CP signal awakening function to ensure that a gun can be identified, can be used for shaking hands and can be charged. In the power supply circuit of fig. 4, the MOS transistor Q4 is located on the input loop of the BUCK power supply chip, and the power supply chip will start to operate only when the transistor Q5 or Q6 is turned on, or the transistor Q3 in fig. 2 is turned on. The key switch ON gear signal, the OBC auxiliary power supply CHG-AC signal and the direct current charging pile auxiliary power supply CHG-DC signal are respectively applied to the triode Q5 after being isolated by the reflux diodes D7, D8 and D9; the CP pulse signal acts on the triode Q3; the control level of an I/O pin of the CPU acts on the triode Q6, the Q6 is set to increase the function of delayed power failure of a power supply part, and when the vehicle-mounted controller is accidentally lost or powered OFF due to an external activation signal, the DELAY-OFF input level can be controlled by the CPU to achieve the purposes of delayed power failure and data storage.

The utility model provides an electric automobile exchanges all electronic components parameter specification of charging control pilot signal's detection circuitry is shown in figure 5.

Specifically, the utility model discloses to electric automobile alternating current charging reliability and the not good enough problem of stability on the existing market, provided a detection circuitry who exchanges charging control pilot signal, through preferred electronic components and ingenious circuit design, improved CC and CP signal sampling precision, greatly promoted alternating current charging reliability and stability. And simultaneously, the utility model discloses having drawn forth switch S2' S shorting stub in detection circuitry, when using as the equipment debugging or emergent when charging the use, can directly link the software control logic that avoids switch S2 with shorting stub and signal ground, make things convenient for the scene to use in a flexible way. Additionally, the utility model provides an alternating current charging control pilot signal detection circuitry can also realize the CP signal and awaken the function that the power was fallen and the time delay was gone up to activation vehicle-mounted controller low pressure, when vehicle-mounted controller lost or cut off the power supply because of external activation signal accident, can reach the time delay through CPU control logic and fall the purpose of electricity and data storage.

The above only be the preferred embodiment of the utility model discloses a not consequently restriction the patent scope of the utility model, all be in the utility model discloses a under the design, utilize the equivalent structure transform of what the content of the description and the attached drawing was done, or direct/indirect application all includes in other relevant technical field the utility model discloses a patent protection is within range.

Claims

1. A detection circuit for an alternating current charging control guide signal of an electric vehicle is characterized by comprising a CP detection circuit, wherein the CP detection circuit comprises an operational amplifier U1, diodes D1-D4, an MOS tube Q1, triodes Q2-Q3, fuses F1-F2, resistors R1-R14, capacitors C1-C3, a signal input end CP to be detected, a pulse signal output end DI-CP, a CP power supply wake-up signal output end CP-PWM, a switch S2 control signal input end CTR-CP, and a switch S2 short-circuit signal input end S2-Jper, the signal input end CP to be detected, the diode D1, the fuse F1, the diode D3, the resistor R4, the resistor R5, the triode Q3 and the CP power supply wake-up signal output end CP-PWM are sequentially connected in series, two ends of a resistor R9 are respectively and electrically connected with an output end of the diode D3 and an inverting input end of the operational amplifier U1, one ends of the resistors R11 and R12 are respectively and electrically connected with an in-phase input end of the operational amplifier U1, the resistor R4 and a resistor R12 are respectively and an inverting input end of a GND 3, the diode D3 and a resistor R6 are respectively and a GND, the other end of the diode D3 and a resistor R4 are electrically connected with a GND, two ends of a GND are respectively and a GND, a resistor R3 are electrically connected with an inverting input end of a GND, a resistor R6, a resistor R3, a signal input end of a resistor R3, a resistor R4 and a GND, a resistor R4 are respectively, the input end of the diode D3, the resistor R2, the fuse F2 and the short-circuit signal input end S2-Jper of the switch S2 are sequentially and serially connected, the resistor R2, the MOS tube Q1 and the emitting electrode of the triode Q2 are sequentially and serially connected, the base electrode of the triode Q2, the resistor R8 and the control signal input end CTR-CP of the switch S2 are sequentially and serially connected, the collector electrode of the triode Q2, the resistor R7 and the power supply D5V are sequentially and serially connected, one ends of the MOS tube Q1 and the resistor R3 are respectively and electrically connected with a signal ground GND, and the other end of the resistor R3 is electrically connected with the emitting electrode of the triode Q2;

2. The detection circuit for the ac charging control pilot signal of the electric vehicle as claimed in claim 1, wherein the MOS transistor Q1 is turned on when the control signal input terminal CTR-CP of the switch S2 is inputted with a high level, and the MOS transistor Q1 is turned off when the control signal input terminal CTR-CP of the switch S2 is inputted with a low level.

3. The detection circuit for the AC charging control pilot signal of the electric automobile as claimed in claim 1, wherein the pulse signal output terminal DI-CP and the switch S2 control signal input terminal CTR-CP are electrically connected to the I/O pin of the vehicle-mounted controller CPU respectively.

4. The detection circuit of the AC charging control pilot signal of the electric automobile as claimed in claim 1, wherein the signal output terminal AI-CC is electrically connected to the A/D pin of the vehicle-mounted controller CPU.

5. The detection circuit of the AC charging control pilot signal of the electric automobile as claimed in claim 1, wherein the DC/DC power chip is BUCK type DC/DC power chip.