CN117048371B - New energy automobile charging awakening system and method - Google Patents
New energy automobile charging awakening system and method Download PDFInfo
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- CN117048371B CN117048371B CN202311323823.3A CN202311323823A CN117048371B CN 117048371 B CN117048371 B CN 117048371B CN 202311323823 A CN202311323823 A CN 202311323823A CN 117048371 B CN117048371 B CN 117048371B
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- 230000000630 rising effect Effects 0.000 claims abstract description 57
- 238000007493 shaping process Methods 0.000 claims abstract description 19
- 230000002618 waking effect Effects 0.000 claims abstract description 17
- 230000007704 transition Effects 0.000 claims abstract description 9
- 239000003990 capacitor Substances 0.000 claims description 27
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Classifications
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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
- 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
- B60L53/60—Monitoring or controlling charging stations
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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
- B60R16/023—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 for transmission of signals between vehicle parts or subsystems
- B60R16/0231—Circuits relating to the driving or the functioning of the vehicle
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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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Automation & Control Theory (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The application discloses a new energy automobile charging and waking system and a method, which relate to the technical field of new energy automobiles and comprise the following steps: the rising edge capturing module is used for capturing the rising edge of the input control guide signal and outputting a first output signal VO1; the comparison processing module is used for carrying out amplitude modulation and buffer processing on the first output signal VO1 to respectively obtain a VCM+ signal and a VCM-signal; the pulse width adjusting module is used for respectively inputting the VCM+ signal and the VCM-signal as a non-inverting terminal input and an inverting terminal input of the comparing unit and outputting a second output signal VO2, and the shaping processing module is used for shaping the second output signal VO2 and outputting a third output signal VO3; wherein the vehicle CPU wakes up when the third output signal VO3 transitions from a low level to a high level. The application determines whether to wake up by judging whether the CP signal state is changed, and can be compatible with charging piles in different forms.
Description
Technical Field
The application relates to the technical field of new energy automobiles, in particular to a new energy automobile charging and waking system and a new energy automobile charging and waking method.
Background
With the improvement of the storage capacity of the new energy automobile, the ordered charging is realized, the peak clipping and valley filling of the power grid are realized, and the method has important significance for improving the power grid impact and maintaining the safe and stable operation of the power grid.
For a non-instant charging scenario, a charging gun is often inserted first, and charging is started after waiting for entering a charging sequence. The vehicle to be charged is in a sleep state (ultra-low power consumption state) so as to reduce the power consumption of the vehicle and avoid the power shortage of the battery of the vehicle; and should wake up immediately upon entering the charging sequence, entering the charging state. The state is switched from the waiting state to the charging state, and no secondary gun inserting state changes, namely the connection state (national standard CC/European standard PP/American standard PD) does not change.
Since the standard does not clearly require that the charging pile on the market is in an idle or waiting state (CP amplitude is 9V), the CP signal form is not consistent: the partial pile CP signal remains high and the other partial pile CP signal is in a continuously hopped state (continuous PWM state).
The existing new energy automobile generally wakes up the vehicle charging component and enters a charging mode by detecting the voltage jump of a pilot signal (CP signal) or the change of a gun connection state (CC/PP/PD). The wake-up logic and circuit can normally wake up the vehicle and enter a charging state for CP signal jump and plug-in gun connection state (CC/PP/PD) signal jump accompanying plug-in gun movement. However, for the reserved charge scenario, existing wake-up logic and wake-up circuits may cause the vehicle to "wake-up failure" or "wake-on-break" conditions. The main reasons for the "wake-up failure" are: during the reserved waiting period, the connection state (CC/PP/PD) voltage is unchanged due to no secondary plugging action, and the vehicle which is awakened by the CC/PP voltage change cannot be awakened. The main reasons for the occurrence of "on hold and wake" are: the vehicle wakes up by detecting a voltage transition of the (CP) signal. When the charging pile with the CP signal in the continuous PWM state is connected, the vehicle can be immediately awakened by the next voltage jump even if the vehicle goes to sleep, so that the vehicle cannot sleep. This situation will continue to consume battery power, and in severe cases may result in a situation where the vehicle is depleted due to insufficient low voltage battery power.
Therefore, the requirement of reserved charging and ordered charging cannot be completely met only by the logic for detecting the voltage jump. A more sophisticated wake-up scheme is needed to be compatible with different types of charging piles on the market.
In addition, there is a scheme of using dual CPUs in the market, a singlechip with lower power consumption is used for monitoring an input wake-up signal, and software judges whether to wake up the main CPU. The circuit is not completely put into sleep mode in nature, because a single-chip microcomputer is always in an operating state. The scheme has the biggest problem that the standby power consumption is high, the current of the storage battery can be continuously consumed in any time period, and the standby time of the whole vehicle is shortened.
Disclosure of Invention
The application aims to solve the technical problem of overcoming the defects of the prior art and providing a new energy automobile charging and waking system and a method.
In order to solve the technical problems, the technical scheme of the application is as follows:
a new energy automobile charging wake-up system, comprising:
the rising edge capturing module is used for capturing the rising edge of the input control guide signal and outputting a first output signal VO1;
the comparison processing module is used for carrying out amplitude modulation and buffer processing on the first output signal VO1 to respectively obtain a VCM+ signal and a VCM-signal;
the pulse width adjusting module is used for respectively inputting the VCM+ signal and the VCM-signal as a non-inverting terminal input and an inverting terminal input of the comparing unit and outputting a second output signal VO2;
the shaping processing module is used for shaping the second output signal VO2 and outputting a third output signal VO3;
wherein the vehicle CPU wakes up when the third output signal VO3 transitions from a low level to a high level.
As a preferable scheme of the new energy automobile charging and waking system, the application comprises the following steps: the new energy automobile charging awakening system is used for executing the following awakening logic:
when the first state of the control guide signal is no signal and the second state is no signal, the CPU of the vehicle is not awakened;
when the first state of the control guide signal is high level and the second state is high level, the CPU of the vehicle is not awakened;
when the first state of the control guide signal is a pulse width modulation signal and the second state is the pulse width modulation signal, the CPU of the vehicle is not awakened;
when the first state of the control guide signal is no signal and the second state is high level, the CPU of the vehicle is awakened;
when the first state of the control guide signal is a no-signal and the second state is a pulse width modulation signal, the CPU of the vehicle is awakened;
when the first state of the control guide signal is high level and the second state is no signal, the CPU of the vehicle is not awakened;
when the first state of the control guide signal is high level and the second state is pulse width modulation signal, the CPU of the vehicle is awakened;
when the first state of the control guide signal is a pulse width modulation signal and the second state is no signal, the CPU of the vehicle is not awakened;
when the first state of the control guide signal is a pulse width modulation signal and the second state is a high level, the CPU of the vehicle is not awakened.
As a preferable scheme of the new energy automobile charging and waking system, the application comprises the following steps: the rising edge capturing module comprises a rising edge trigger, the clock end of the rising edge trigger is connected with an input control guide signal, the input end of the rising edge trigger is connected with one end of the first resistor, the other end of the first resistor is connected with the power supply end, and the positive output end of the rising edge trigger is connected with the input end of the comparison processing module.
As a preferable scheme of the new energy automobile charging and waking system, the application comprises the following steps: the rising edge capturing module further comprises a second resistor and a first capacitor, one end of the first capacitor is connected with the zero clearing end of the rising edge trigger, one end of the first capacitor is grounded, one end of the second resistor is connected with the inverted output end of the rising edge trigger, and the other end of the second resistor is connected between the zero clearing end of the rising edge trigger and the first capacitor.
As a preferable scheme of the new energy automobile charging and waking system, the application comprises the following steps: the comparison processing module comprises an amplitude modulation processing circuit and a buffer processing circuit;
the amplitude modulation processing circuit comprises a third resistor and a fourth resistor, one end of the third resistor is connected with the positive output end of the rising edge trigger, the other end of the third resistor is connected with the inverting input end of the comparison unit, one end of the fourth resistor is connected between the third resistor and the inverting input end of the comparison unit, and the other end of the fourth resistor is grounded;
the slow-rising processing circuit comprises a diode, a fifth resistor, a sixth resistor, a seventh circuit and a second capacitor, wherein the input end of the diode is connected with the positive output end of the rising edge trigger, the output end of the diode is connected with one end of the seventh resistor, the other end of the seventh resistor is connected with the non-inverting input end of the comparison unit, one end of the fifth resistor is connected between the seventh resistor and the non-inverting input end of the comparison unit, the other end of the fifth resistor is connected with a power supply end, one end of the sixth resistor is connected between the seventh resistor and the non-inverting input end of the comparison unit, the other end of the sixth resistor is grounded, one end of the second capacitor is connected between the seventh resistor and the non-inverting input end of the comparison unit, and the other end of the second capacitor is connected between the sixth resistor and a grounding end.
As a preferable scheme of the new energy automobile charging and waking system, the application comprises the following steps: the shaping processing module comprises a monostable multivibrator, the input end of the monostable multivibrator is connected with the output end of the comparison unit, and the output end of the monostable multivibrator outputs the third output signal VO3.
As a preferable scheme of the new energy automobile charging and waking system, the application comprises the following steps: the pulse width holding time of the first output signal VO1 is tw1, the theoretical shortest time for the voltage value of the VCM-signal to rise above the voltage value of the vcm+ signal is tw2, the actual time for the voltage value of the VCM-signal to rise above the voltage value of the vcm+ signal is tw3, and the pulse width holding time of the third output signal VO3 is tw4, tw1< tw2< tw3< tw4.
As a preferable scheme of the new energy automobile charging and waking system, the application comprises the following steps: and tw1 is 3-5 ms, tw2 is 2-3 times of tw1, tw3 is 1-2 times of tw2, and tw4 is 2-3 times of tw 3.
The application also provides a new energy automobile charging and waking method, which comprises the following steps:
capturing the rising edge of the input control pilot signal and outputting a first output signal VO1;
performing amplitude modulation and buffer processing on the first output signal VO1 to respectively obtain a VCM+ signal and a VCM-signal;
the VCM+ signal and the VCM-signal are respectively used as the non-inverting terminal input and the inverting terminal input of the comparison unit, and a second output signal VO2 is output;
shaping the second output signal VO2 and outputting a third output signal VO3;
when the third output signal VO3 output transitions from low level to high level, the vehicle CPU wakes up.
As a preferable scheme of the new energy automobile charging and waking method, the application comprises the following steps: the vehicle CPU waking up when the third output signal VO3 output transitions from a low level to a high level includes:
when the first state of the control guide signal is no signal and the second state is no signal, the CPU of the vehicle is not awakened;
when the first state of the control guide signal is high level and the second state is high level, the CPU of the vehicle is not awakened;
when the first state of the control guide signal is a pulse width modulation signal and the second state is the pulse width modulation signal, the CPU of the vehicle is not awakened;
when the first state of the control guide signal is no signal and the second state is high level, the CPU of the vehicle is awakened;
when the first state of the control guide signal is a no-signal and the second state is a pulse width modulation signal, the CPU of the vehicle is awakened;
when the first state of the control guide signal is high level and the second state is no signal, the CPU of the vehicle is not awakened;
when the first state of the control guide signal is high level and the second state is pulse width modulation signal, the CPU of the vehicle is awakened;
when the first state of the control guide signal is a pulse width modulation signal and the second state is no signal, the CPU of the vehicle is not awakened;
when the first state of the control guide signal is a pulse width modulation signal and the second state is a high level, the CPU of the vehicle is not awakened.
The beneficial effects of the application are as follows:
(1) The application determines whether to wake up by judging whether the CP signal state is changed. The wake-up logic can be compatible with different forms of charging piles, namely, in a standby state, the system is applicable no matter what signal (CP high level, no CP and continuous PWM signal) is continuously transmitted by the pile.
(2) The application realizes that the device can not be repeatedly awakened under the condition of unchanged state, reduces standby power consumption in the scene of reserved charging and ordered charging, and can realize longer reserved charging time.
(3) The new energy automobile charging wake-up system provided by the application is completely realized by a hardware logic circuit, no software participates, the circuit response sensitivity is high, the action time is fixed, the influence from the environment is small, and the EMC/EMI performance is strong.
(4) The new energy automobile charging and waking system provided by the application consists of a trigger, a logic chip such as a comparator, a resistor-capacitor part and the like, has no crystal oscillator and programming device, and has extremely low standby power consumption.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a new energy automobile charging wake-up system provided by the application;
fig. 2 is a schematic circuit diagram of a new energy automobile charging wake-up system provided by the application;
fig. 3 is a schematic diagram of simulation of a first output signal VO1 in the new energy automobile charging wake-up system according to the present application;
FIG. 4 is a schematic diagram of an ascending curve of the voltage value of VCM-in the new energy automobile charging wake-up system provided by the application;
FIG. 5 is a schematic flow chart of the new energy automobile charging wake-up method provided by the application;
fig. 6 is a schematic diagram of a correspondence relationship between a CP signal state change and a third output signal VO3 in the new energy automobile charging wake-up system according to the present application.
Detailed Description
In order that the application may be more readily understood, a more particular description thereof will be rendered by reference to specific embodiments that are illustrated in the appended drawings.
Fig. 1 is a schematic diagram of a new energy automobile charging wake-up system according to an embodiment of the present application. The system includes a rising edge capture module 101, a comparison processing module 102, a pulse width modulation module 103, and a shaping processing module 104. The rising edge capturing module 101 is configured to capture a rising edge of an input control pilot signal, and output a first output signal VO1. The comparison processing module 102 is configured to perform amplitude modulation and buffer processing on the first output signal VO1 to obtain a vcm+ signal and a VCM-signal, respectively. The pulse width adjustment module 103 is configured to take the vcm+ signal and the VCM-signal output from the comparison processing module 102 as the non-inverting input and the inverting input of the comparison unit, and output a second output signal VO2. The shaping processing module 104 is configured to perform shaping processing on the second output signal VO2, and output a third output signal VO3. When the third output signal VO3 transitions from a low level to a high level, the vehicle CPU wakes up.
Specifically, referring to fig. 2, the rising edge capturing module 101 includes a rising edge trigger U4, and a clock terminal (i.e., pin 3) of the rising edge trigger U4 is connected to an input control pilot signal (i.e., cp_in). The input terminal (i.e., pin 2) of the rising edge trigger U4 is connected to one end of the first resistor R13, and the other end of the first resistor R13 is connected to the 5V power supply terminal VDD. The positive output (i.e., pin 5) of the rising edge trigger U4 is connected to the input of the comparison processing module 102.
Preferably, the rising edge trigger U4 is a rising edge trigger with a reset function, so that the rising edge trigger has a self-reset function. The self-resetting function is realized by using the flip-flop inverted output signal. The reset function enables the circuit to recover the initial state, and multiple triggers are realized.
In this embodiment, the rising edge trigger U4 is of the type SN74HC74, and captures an active output level as a high level. It will be appreciated that the rising edge flip-flop may also be formed using flip-flop circuits having similar functionality.
In addition, the rising edge capture module 101 also includes a hold circuit. The holding circuit includes a second resistor R23 and a first capacitor C4. One end of the first capacitor C4 is connected to the zero clearing end (i.e., the 1 st pin) of the rising edge trigger U4, and one end of the first capacitor C4 is grounded. One end of the second resistor R23 is connected to the inverting output end (i.e., the 6 th pin) of the rising edge trigger U4, and the other end of the second resistor R23 is connected between the zero clearing end (i.e., the 1 st pin) of the rising edge trigger U4 and the first capacitor C4. The reset signal of the rising edge trigger is processed by the holding circuit to realize that the output signal keeps a fixed broadband after the capturing is effective.
By adjusting the parameters, the output high-level pulse width holding time tw1 can be adjusted. The pulse width holding time tw1 is calculated by a three-element formula:
u (T) =u (++u (0+) -U (++)) e (-tw 1/T) … … … …), U (T) is the voltage value when the U4 reset input pin is active, tw1= -t×ln (U (T)/5V) = -r23×c4×ln (U (T)/5V).
Let U (t) =2.5 v, r23=50k, c4=100 nF, then tw1= -50k×100×10 (-9) ×ln0.5=3.47 ms.
Referring to fig. 3, the results of the simulation are compared and it can be seen that the results match.
The comparison processing module 102 includes an amplitude modulation processing circuit and a buffer processing circuit. See in particular fig. 2.
The amplitude modulation processing circuit comprises a third resistor R18 and a fourth resistor R25. One end of the third resistor R18 is connected to the positive output end (i.e. the 5 th pin) of the rising edge trigger U4, and the other end of the third resistor R18 is connected to the inverting input end of the comparing unit in the pulse width adjusting module 103. One end of the fourth resistor R25 is connected between the third resistor R18 and the inverting input terminal of the comparing unit, and the other end of the fourth resistor R25 is grounded. The amplitude modulation processing circuit realizes the voltage division processing of the first output signal VO1 through two voltage dividing resistors, namely a third resistor R18 and a fourth resistor R25.
As can be seen, vcm+=vo1×r25/(r18+r25). Typically, if the third resistor r18=fourth resistor R25, vcm+= (VO 1)/2.
The ramp-up processing circuit includes a diode SD3, a fifth resistor R16, a sixth resistor R17, a seventh circuit R24, and a second capacitor C1. The input end of the diode SD3 is connected to the positive output end (i.e. the 5 th pin) of the rising edge trigger U4, the output end of the diode SD3 is connected to one end of the seventh resistor R24, and the other end of the seventh resistor R24 is connected to the non-inverting input end of the comparing unit in the pulse width modulation module 103. One end of the fifth resistor R16 is connected between the seventh resistor R24 and the non-inverting input terminal of the comparing unit, and the other end of the fifth resistor R16 is connected to the 5V power supply terminal VDD. One end of the sixth resistor R17 is connected between the seventh resistor R24 and the non-inverting input terminal of the comparing unit, and the other end of the sixth resistor R17 is grounded. One end of the second capacitor C1 is connected between the seventh resistor R24 and the non-inverting input terminal of the comparing unit, and the other end of the second capacitor C1 is connected between the sixth resistor R17 and the ground terminal. For the effective level (high level) signal of the first output signal VO1, after voltage division and current limiting, the capacitor unidirectional C1 is charged, and the voltage VCM-rising time and rising curve of the capacitor can be adjusted by adjusting the resistance and the capacitor parameters.
In the present embodiment, the model number of the diode SD3 is 1N5817.
The pulse width modulation module 103 is composed of a general comparator. The input signals of the pulse width adjustment module 103 are the vcm+ and VCM-signals output by the pre-stage comparison processing module 102, and the output signal is the second output signal VO2. In this embodiment, the comparator is of the type TLV3701.
Since the voltage value of VCM-is the voltage value on the capacitor C1, the rising curve is shown in FIG. 4. The active level (high level) of the first output signal VO1 output by the rising edge capturing module 101 charges it. Under the influence of the charging curve, the voltage will rise slowly, and a certain time is needed for the establishment from zero to high. Vcm+ is synchronized with the rising time of the first output signal VO1. Compared with the two voltages, the effective waveform with controllable maximum width can be output. If the first output signal VO1 is kept IN a high state (cp_in duty cycle is taken to be 100%), the minimum time tw2 for the VCM-voltage value to rise above the vcm+ voltage value can be calculated. tw2 is solved according to the following manner:
according to the three-element formula, f (T) =f (++f (0+) -f (++)) e (-T/T).
The voltage relationship of VCM-corresponds to the following equation: u (VCM-) =u% infinity) + (U (0 +) -U (++)) e (-T/T). Since U (vcm+) =1/2U (VO 1), U (vcm+) max=2.5v. Therefore, U (VCM-). Gtoreq.2.5V, VO2 output is low.
Further U (VCM-) =2.5v, then 2.5v=u (≡ ++ (U (0+) -U (++)) e (-tw 2/T).
U(∞)=（VO1-U(SD3)）*R24/(R24+R17)=3.52V。
U(0+) = 5V*R17/( R17+R16) =0.455V。
2.5V=3.52V+ (0.455V-3.52V) e (-tw 2/T) can be obtained.
Solving to obtain tw2= -ln ((3.52-2.5)/3.06) t=1.099 (R24// R27) c1=9.30 ms.
The value tw2 obtained by this solution is a case where the output of the first output signal VO1 is assumed to be kept at a high level. IN an actual scenario, since the input signal cp_in is a PWM signal, the output of the first output signal VO1 is also a PWM signal, and the time tw3, during which the VCM-voltage value IN the actual circuit rises above the vcm+ voltage value, is greater than the ideal value, due to the duty ratio thereof. From the simulation result (cp_in duty cycle taken 5%), it can be derived that the maximum value of tw3 is about 14ms.
The shaping processing module 104 performs shaping processing on the second output signal VO2 output by the pulse width adjusting module 103, and filters unnecessary transitions in the second output signal VO2 to output a fixed waveform width. The shaping processing module 104 includes a monostable multivibrator. Referring to fig. 2, the input of the monostable multivibrator (i.e., pin 9) is connected to the output of the comparator. The forward output (i.e. pin 3) of the monostable multivibrator outputs a third output signal VO3. Both the A1 pin (i.e., pin 10) and the A2 pin (i.e., pin 11) of the monostable multivibrator are grounded.
In this embodiment, the monostable multivibrator is model SN74121.
The shaping processing module 104 is configured to trigger on a rising edge and is not repeatable. In the trigger validity period, the input signals VO2 and VO3 with multiple rising edges cannot generate multiple repeated wake-up signals so as to obtain wake-up signals with fixed widths.
The shaping processing module 104 outputs a wake-up signal with a fixed width, which is configured by the SN74121 external to the resistor-capacitor element. In this embodiment, the pulse width retention time tw4=0.7rxc=0.722kr×2.2uf=33.88 ms of the third output signal VO3 is set. The third output signal VO3 with a fixed width and without repeated wake-up can ensure the main CPU to wake up and avoid the program logic error caused by repeated wake-up.
Note that, to ensure that the circuit works normally, tw1< tw2< tw3< tw4 should be ensured. In the application, tw1 is set to 3-5 ms, tw2 is set to 2-3 times of tw1, tw3 is set to 1-2 times of tw2, and tw4 is set to 2-3 times of tw 3.
Table 1 is a table of CP signal state change versus wake-up logic. Referring to table 1, the above new energy automobile charging wake-up system is used for executing the following wake-up logic:
when the first state of the control guide signal is no signal and the second state is no signal, the CPU of the vehicle is not awakened;
when the first state of the control guide signal is high level and the second state is high level, the CPU of the vehicle is not awakened;
when the first state of the control guide signal is a pulse width modulation signal and the second state is the pulse width modulation signal, the CPU of the vehicle is not awakened;
when the first state of the control guide signal is no signal and the second state is high level, the CPU of the vehicle is awakened;
when the first state of the control guide signal is a no-signal and the second state is a pulse width modulation signal, the CPU of the vehicle is awakened;
when the first state of the control guide signal is high level and the second state is no signal, the CPU of the vehicle is not awakened;
when the first state of the control guide signal is high level and the second state is pulse width modulation signal, the CPU of the vehicle is awakened;
when the first state of the control guide signal is a pulse width modulation signal and the second state is no signal, the CPU of the vehicle is not awakened;
when the first state of the control guide signal is a pulse width modulation signal and the second state is a high level, the CPU of the vehicle is not awakened.
Table 1: CP signal state change and wake-up logic relation table
As can be seen from table 1, when the first state of the control pilot signal is no signal and the second state is no signal, the CPU of the vehicle is not awakened; when the first state of the control guide signal is high level and the second state is high level, the CPU of the vehicle is not awakened; when the first state of the control guide signal is a pulse width modulation signal and the second state is the pulse width modulation signal, the CPU of the vehicle is not awakened; when the first state of the control guide signal is no signal and the second state is high level, the CPU of the vehicle is awakened; when the first state of the control guide signal is a no-signal and the second state is a pulse width modulation signal, the CPU of the vehicle is awakened; when the first state of the control guide signal is high level and the second state is no signal, the CPU of the vehicle is not awakened; when the first state of the control guide signal is high level and the second state is pulse width modulation signal, the CPU of the vehicle is awakened; when the first state of the control guide signal is a pulse width modulation signal and the second state is no signal, the CPU of the vehicle is not awakened; when the first state of the control guide signal is a pulse width modulation signal and the second state is a high level, the CPU of the vehicle is not awakened.
The wake-up logic has the following characteristics:
1. for the reservation waiting state, i.e. the signal with unchanged CP state (continuous no CP, CP high level, CP PWM state), the wake-up is not repeated.
2. For the gun inserting action (or no cp→cp PWM), and the corresponding CP state change under the condition of waiting to charge to enter the charging state (CP high level→cp PWM), the wake-up action is executed at the moment of switching.
3. The wake-up operation is not performed at the moment of switching between the gun pulling operation (CP high level→no CP or CP pwm→no CP) and the CP state change corresponding to the charging state entering the end state (CP pwm→cp high level).
In the wake-up logic, the wake-up dependency is not the CP signal level change, but the determination of whether to wake-up is made by determining whether the CP signal state changes. The benefits of this logic are: the charging pile can be compatible with different forms. That is, the system is applicable regardless of what signal (CP high level, no CP, and continuous PWM signal) the pile is continuously transmitting in the standby state.
Referring to fig. 5, the embodiment of the application also provides a new energy automobile charging and waking method, which comprises steps S101 to S105, and the specific steps are as follows:
step S101: capturing the rising edge of the input control pilot signal and outputting a first output signal VO1;
step S102: performing amplitude modulation and buffer processing on the first output signal VO1 to respectively obtain a VCM+ signal and a VCM-signal;
step S103: the VCM+ signal and the VCM-signal are respectively used as the non-inverting terminal input and the inverting terminal input of the comparison unit, and a second output signal VO2 is output;
step S104: shaping the second output signal VO2 and outputting a third output signal VO3;
step S105: when the third output signal VO3 output transitions from low level to high level, the vehicle CPU wakes up.
According to the new energy automobile charging awakening method, a set of comprehensive awakening logic is provided according to the actual charging scene of the new energy automobile. The scheme generalizes the CP state into three states: CP-free, CP high, CP PWM. Whether or not wake-up is required is not a CP signal level change, but is determined by judging whether or not the CP signal state is changed. The correspondence of the CP signal state change with the third output signal VO3 is shown in fig. 6.
Therefore, the wake-up logic provided by the technical scheme of the application can be compatible with charging piles in different forms, can not be repeatedly waken under the condition of unchanged state, reduces standby power consumption in reserved charging and ordered charging scenes, and can realize longer reserved charging time.
In addition to the above embodiments, the present application may have other embodiments; all technical schemes formed by equivalent substitution or equivalent transformation fall within the protection scope of the application.
Claims (8)
1. A new energy automobile wakes up system that charges which characterized in that: comprising the following steps:
the rising edge capturing module is used for capturing the rising edge of the input control guide signal and outputting a first output signal VO1;
the comparison processing module is used for carrying out amplitude modulation and buffer processing on the first output signal VO1 to respectively obtain a VCM+ signal and a VCM-signal;
the pulse width adjusting module is used for respectively inputting the VCM+ signal and the VCM-signal as a non-inverting terminal input and an inverting terminal input of the comparing unit and outputting a second output signal VO2;
the shaping processing module is used for shaping the second output signal VO2 and outputting a third output signal VO3;
wherein when the third output signal VO3 transitions from a low level to a high level, the vehicle CPU wakes up;
the new energy automobile charging awakening system is used for executing the following awakening logic:
when the first state of the control guide signal is no signal and the second state is no signal, the CPU of the vehicle is not awakened;
when the first state of the control guide signal is high level and the second state is high level, the CPU of the vehicle is not awakened;
when the first state of the control guide signal is a pulse width modulation signal and the second state is the pulse width modulation signal, the CPU of the vehicle is not awakened;
when the first state of the control guide signal is no signal and the second state is high level, the CPU of the vehicle is awakened;
when the first state of the control guide signal is a no-signal and the second state is a pulse width modulation signal, the CPU of the vehicle is awakened;
when the first state of the control guide signal is high level and the second state is no signal, the CPU of the vehicle is not awakened;
when the first state of the control guide signal is high level and the second state is pulse width modulation signal, the CPU of the vehicle is awakened;
when the first state of the control guide signal is a pulse width modulation signal and the second state is no signal, the CPU of the vehicle is not awakened;
when the first state of the control guide signal is a pulse width modulation signal and the second state is a high level, the CPU of the vehicle is not awakened.
2. The new energy automobile charging wake-up system of claim 1, wherein: the rising edge capturing module comprises a rising edge trigger, the clock end of the rising edge trigger is connected with an input control guide signal, the input end of the rising edge trigger is connected with one end of a first resistor, the other end of the first resistor is connected with a power supply end, and the positive output end of the rising edge trigger is connected with the input end of the comparison processing module.
3. The new energy automobile charging wake-up system of claim 2, wherein: the rising edge capturing module further comprises a second resistor and a first capacitor, one end of the first capacitor is connected with the zero clearing end of the rising edge trigger, one end of the first capacitor is grounded, one end of the second resistor is connected with the inverted output end of the rising edge trigger, and the other end of the second resistor is connected between the zero clearing end of the rising edge trigger and the first capacitor.
4. The new energy automobile charging wake-up system of claim 2, wherein: the comparison processing module comprises an amplitude modulation processing circuit and a buffer processing circuit;
the amplitude modulation processing circuit comprises a third resistor and a fourth resistor, one end of the third resistor is connected with the positive output end of the rising edge trigger, the other end of the third resistor is connected with the inverting input end of the comparison unit, one end of the fourth resistor is connected between the third resistor and the inverting input end of the comparison unit, and the other end of the fourth resistor is grounded;
the slow-rising processing circuit comprises a diode, a fifth resistor, a sixth resistor, a seventh resistor and a second capacitor, wherein the input end of the diode is connected with the positive output end of the rising edge trigger, the output end of the diode is connected with one end of the seventh resistor, the other end of the seventh resistor is connected with the non-inverting input end of the comparison unit, one end of the fifth resistor is connected between the seventh resistor and the non-inverting input end of the comparison unit, the other end of the fifth resistor is connected with a power supply end, one end of the sixth resistor is connected between the seventh resistor and the non-inverting input end of the comparison unit, the other end of the sixth resistor is grounded, one end of the second capacitor is connected between the seventh resistor and the non-inverting input end of the comparison unit, and the other end of the second capacitor is connected between the sixth resistor and a grounding end.
5. The new energy automobile charging wake-up system of claim 1, wherein: the shaping processing module comprises a monostable multivibrator, the input end of the monostable multivibrator is connected with the output end of the comparison unit, and the output end of the monostable multivibrator outputs the third output signal VO3.
6. The new energy automobile charging wake-up system of claim 1, wherein: the pulse width holding time of the first output signal VO1 is tw1, the theoretical shortest time for the voltage value of the VCM-signal to rise above the voltage value of the vcm+ signal is tw2, the actual time for the voltage value of the VCM-signal to rise above the voltage value of the vcm+ signal is tw3, and the pulse width holding time of the third output signal VO3 is tw4, tw1< tw2< tw3< tw4.
7. The new energy automobile charge wake-up system of claim 6, wherein: and tw1 is 3-5 ms, tw2 is 2-3 times of tw1, tw3 is 1-2 times of tw2, and tw4 is 2-3 times of tw 3.
8. A new energy automobile charging and waking method is characterized in that: comprising the following steps:
capturing the rising edge of the input control pilot signal and outputting a first output signal VO1;
performing amplitude modulation and buffer processing on the first output signal VO1 to respectively obtain a VCM+ signal and a VCM-signal;
the VCM+ signal and the VCM-signal are respectively used as the non-inverting terminal input and the inverting terminal input of the comparison unit, and a second output signal VO2 is output;
shaping the second output signal VO2 and outputting a third output signal VO3;
when the third output signal VO3 is output from low level to high level, the vehicle CPU wakes up, which specifically includes:
when the first state of the control guide signal is no signal and the second state is no signal, the CPU of the vehicle is not awakened;
when the first state of the control guide signal is high level and the second state is high level, the CPU of the vehicle is not awakened;
when the first state of the control guide signal is a pulse width modulation signal and the second state is the pulse width modulation signal, the CPU of the vehicle is not awakened;
when the first state of the control guide signal is no signal and the second state is high level, the CPU of the vehicle is awakened;
when the first state of the control guide signal is a no-signal and the second state is a pulse width modulation signal, the CPU of the vehicle is awakened;
when the first state of the control guide signal is high level and the second state is no signal, the CPU of the vehicle is not awakened;
when the first state of the control guide signal is high level and the second state is pulse width modulation signal, the CPU of the vehicle is awakened;
when the first state of the control guide signal is a pulse width modulation signal and the second state is no signal, the CPU of the vehicle is not awakened;
when the first state of the control guide signal is a pulse width modulation signal and the second state is a high level, the CPU of the vehicle is not awakened.
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