CN110549879A - CP signal voltage detection method and device of electric vehicle alternating current charging system - Google Patents
CP signal voltage detection method and device of electric vehicle alternating current charging system Download PDFInfo
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- CN110549879A CN110549879A CN201910850708.9A CN201910850708A CN110549879A CN 110549879 A CN110549879 A CN 110549879A CN 201910850708 A CN201910850708 A CN 201910850708A CN 110549879 A CN110549879 A CN 110549879A
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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
- B60L53/10—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 characterised by the energy transfer between the charging station and the vehicle
-
- 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
- B60L53/10—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 characterised by the energy transfer between the charging station and the vehicle
- B60L53/14—Conductive energy transfer
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
-
- 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
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a CP signal voltage detection method and device of an electric automobile alternating current charging system, and belongs to the technical field of electric automobile charging. The CP signal voltage detection method of the electric vehicle alternating current charging system comprises the following steps: s1, voltage comparison: the CP signal voltage value is compared with the set voltage value respectively, and high level or low level is output by comparing the voltage values of the CP signal voltage value and the set voltage value; s2, isolating output: the high level or the low level output by the step S1 is converted into a CMOS level signal by an opto-coupler and is input to pins of the MCU respectively; s3, sampling calculation: and reading the level state of the pin through the MCU, and inquiring to obtain the current voltage value. The CP signal voltage detection method of the alternating current charging system of the electric automobile is simple and easy to implement, wide in application scene, capable of improving the reliability of the control and guide function of the alternating current charging pile, capable of reducing the cost and good in popularization and application value.
Description
Technical Field
The invention relates to the technical field of electric vehicle charging, and particularly provides a CP signal voltage detection method and device of an electric vehicle alternating current charging system.
background
The charging technology of the electric vehicle is divided into direct current charging and alternating current charging. Alternating-current charging stake compares direct-current charging stake and has certain advantage on volume, cost and installation condition.
And the CP is in full charge control guidance and is used for monitoring the interaction function between the charging pile and the electric automobile. There are four modes according to the location of CP signal generation and detection. The mode that fills electric pile wide adoption at present is three, fills electric pile and provides and produce and detect CP signal promptly, discernment and control charged state.
According to the cable that charges with fill electric pile or electric automobile's connected state, divide into three kinds of connected modes of A B C, the connected mode C that at present extensively adopts, the cable that charges is fixed promptly and links to each other with filling electric pile, links to each other with electric automobile through charging plug, under this kind of connected mode, needs to fill electric pile and pass through CP signal judgement charging plug's state such as insert and extract.
The CP signal is divided into 2 states of DC output and PWM output, where the PWM period is 1 khz. There are 3 states 12V, 9V, 6V depending on the voltage class. The charging plug is not plugged into the socket of the electric automobile, the charging plug is plugged into the socket of the electric automobile, and the electric automobile is ready and requests three states of alternating current output. The charging pile needs to identify the voltage state of the CP signal to judge the state of the charging behavior.
the current CP signal voltage detection usually adopts an analog-to-digital conversion method. The method is divided into two modes of an external AD chip and a built-in AD mode by using the MCU. The external AD chip has the defects of complex isolation circuit, high cost and the like, and the MCU built-in AD has the defects of poor precision, weak anti-interference capability and the like.
disclosure of Invention
the invention aims at solving the problems and provides a CP signal voltage detection method of an electric vehicle alternating current charging system, which is simple and easy to implement, has wide application scenes, can improve the reliability of the control and guidance function of an alternating current charging pile and can reduce the cost.
The invention further aims to provide a CP signal voltage detection device of the alternating current charging system of the electric automobile.
in order to achieve the purpose, the invention provides the following technical scheme:
A CP signal voltage detection method of an electric vehicle alternating current charging system specifically comprises the following steps:
s1, voltage comparison: the CP signal voltage value is compared with the set voltage value respectively, and high level or low level is output by comparing the voltage values of the CP signal voltage value and the set voltage value;
S2, isolating output: the high level or the low level output by the step S1 is converted into a CMOS level signal by an opto-coupler and is input to pins of the MCU respectively;
s3, sampling calculation: and reading the level state of the pin through the MCU, and inquiring to obtain the current voltage value.
Preferably, in step S1, the voltage values are set to +2.5V, +6.5V, +10V, and when the CP signal voltage value is greater than the above-mentioned constant voltage values +2.5V, +6.5V, +10V, a high level of +15V is output, otherwise a low level of 0V is output, and three level values are obtained.
Preferably, the three level values are converted into three CMOS level signals through an optical coupler, and the three CMOS level signals are input into three pins of the MCU.
Preferably, the sampling calculation in step S3 includes: 1) configuring the states of three pins of the MCU as input states; 2) regularly reading the input level states of the three pins; 3) filtering the invalid level state; 4) and judging the voltage value of the CP signal according to the level value combination.
Preferably, the three-pin input level state is read at regular time intervals, and is recorded as 1 when the pin level is high and as 0 when the pin level is low.
Preferably, the filtering invalid level state is that the MCU continuously reads three pin levels at a certain frequency, and if all the three pin levels are low, the filtering invalid level is an invalid level.
Preferably, when filtering the inactive level, three pin levels are read every 500 us.
A CP signal voltage detection device of an electric vehicle alternating current charging system comprises the following modules:
A voltage comparison module: the device is responsible for comparing the CP signal voltage value with a set voltage value and outputting a high level or a low level by comparing the magnitude of the two voltage values;
An isolation output module: the power supply is responsible for converting a high level or a low level output by the voltage comparison module into a CMOS level signal and respectively inputting the CMOS level signal into pins of the sampling calculation module;
A sampling calculation module: and the device is responsible for inquiring and obtaining the current voltage value by reading the level state of the pin.
Preferably, the voltage comparing module is composed of three comparators, the set voltage values are +2.5V, +6.5V, +10V, and the three comparators compare with each other, and when the CP signal voltage value is greater than the set voltage values +2.5V, +6.5V, +10V, a high level +15V is output, otherwise, a low level 0V is output, and three level values are obtained.
Preferably, the isolation output module is three optocouplers, the sampling calculation module is an MCU, the three level values are converted into three CMOS level signals through the optocouplers, and the three CMOS level signals are input to three pins of the MCU.
wherein, the MCU sampling calculation process includes:
1) Configuring the states of three pins of the MCU as input states;
2) Regularly reading the input level states of the three pins, and when the input level states of the three pins are regularly read, recording the input level states as 1 when the pin level is high, and recording the input level states as 0 when the pin level is low;
3) Filtering an invalid level state, wherein the MCU continuously reads three pin levels every 500us, and if the three pin levels are all low, the three pin levels are invalid levels, filtering the invalid levels;
4) And judging the voltage value of the CP signal according to the level value combination.
Compared with the prior art, the CP signal voltage detection method of the electric vehicle alternating current charging system has the following outstanding beneficial effects: the CP signal voltage detection method of the electric vehicle alternating current charging system is simple and easy to implement, can improve the reliability of the control and guide function of the alternating current charging pile, reduces the cost, has wide application scenes, and has good popularization and application values.
Drawings
FIG. 1 is a flow chart of a CP signal voltage detection method of an AC charging system of an electric vehicle according to the present invention;
Fig. 2 is a topological diagram of a CP signal voltage detection device of the ac charging system of the electric vehicle according to the present invention.
Detailed Description
The CP signal voltage detection method and apparatus of the ac charging system for an electric vehicle according to the present invention will be described in detail with reference to the accompanying drawings and embodiments.
Examples
the invention discloses a CP signal voltage detection method of an electric automobile alternating current charging system, which comprises the following steps:
S1, voltage comparison: the CP signal voltage value is compared with the set voltage value, and the high level or the low level is output by comparing the magnitude of the two voltage values.
Setting the voltage value to +2.5V, +6.5V, +10V, when CP signal voltage value is greater than the above-mentioned constant voltage value +2.5V, +6.5V, +10V, output high level +15V, otherwise output low level 0V, get three level values.
S2, isolating output: the high level or the low level output in step S1 is converted into a CMOS level signal by an opto-coupler, and is input to pins of the MCU, respectively.
The three level values are converted into three CMOS level signals through the optical coupler, and the three CMOS level signals are input into three pins of the MCU.
S3, sampling calculation: and reading the level state of the pin through the MCU, and inquiring to obtain the current voltage value.
The sampling calculation includes:
1) and configuring the states of three pins of the MCU as input states.
2) The input level state of three pins is read regularly, and is recorded as 1 when the pin level is high and is recorded as 0 when the pin level is low, so that 3-bit binary number is obtained. For example, when the CP signal voltage value is DC9V, the output voltage is 0V after comparing with +10V, is +15V after comparing with +6.5V, and is +15V after comparing with +2.5V, and is 0V, +3.3V, respectively after the optical coupling isolation output, and the MCU reading pin value is 011. Similarly, when the CP voltage is PWM9V, the CP signal voltage is changed between 9V and 0V, and the pin level value read by the MCU is 011 or 000.
3) Filtering the invalid level state. The MCU continuously reads the levels of the three pins every 500us, and if the levels of the three pins are all low, namely the levels have a value of 000, the levels are invalid levels, and the invalid levels are filtered.
4) And judging the voltage value of the CP signal according to the level value combination.
As shown in fig. 1 and fig. 2, the specific process is as follows:
1. The CP signal voltage values are input to the comparator 1, the comparator 2, and the comparator 3, respectively, and compared with +2.5V, +6.5V, +10V, respectively, and when greater than the voltage, a high level +15V is output, and when less than the voltage, a low level 0V is output.
2. the three level values are converted into +3.3V and 0V through the optocoupler 1, the optocoupler 2 and the optocoupler 3, and +15V,
3. the MCU reads the high and low states of the 3 pin levels, the +3.3V reading result is 1, the 0V reading result is 0, and the current voltage code value combination is obtained according to the sequence of the +10V, +6.5V, +2.5V comparison results: 000. 011, 001, 111.
4. and configuring three pins of the MCU as input states.
5. and reading the input level state of three pins every 500us to obtain a voltage code value.
6. The code value is 000, and is discarded.
7. according to the effective voltage value code, the current CP signal voltage value is obtained by looking up a table, thereby determining the charging state, as shown in table 1.
TABLE 1 Pin level value vs. CP Signal Voltage value
| level value combination | CP Signal Voltage | State of charge |
| 001 | +6V | The charging gun is inserted and charging is being carried out |
| 011 | +9V | The charging gun is inserted and charging is not started |
| 111 | +12V | without insertion of charging gun |
8. And other processes call the CP signal voltage value for judging the charging state.
as shown in fig. 2, the CP signal voltage detection device of the ac charging system for an electric vehicle according to the present invention includes the following modules:
A voltage comparison module: and the control circuit is responsible for comparing the CP signal voltage value with a set voltage value and outputting a high level or a low level by comparing the magnitude of the two voltage values.
The voltage comparison module is composed of three comparators, the voltage values are set to be +2.5V, +6.5V, +10V, and the three comparators are used for comparing respectively, when the CP signal voltage value is larger than the fixed voltage values +2.5V, +6.5V, +10V, a high level +15V is output, otherwise, a low level 0V is output, and three level values are obtained.
An isolation output module: and the high level or the low level output by the voltage comparison module is converted into a CMOS level signal and is respectively input into pins of the sampling calculation module.
The isolation output module is three optocouplers, the sampling calculation module is an MCU, the three level values are converted into three CMOS level signals through the optocouplers, and the three CMOS level signals are input into three pins of the MCU
a sampling calculation module: and the device is responsible for inquiring and obtaining the current voltage value by reading the level state of the pin.
The MCU sampling calculation process comprises the following steps:
1) Configuring the states of three pins of the MCU as input states;
2) Regularly reading the input level states of the three pins, and when the input level states of the three pins are regularly read, recording the input level states as 1 when the pin level is high, and recording the input level states as 0 when the pin level is low;
3) Filtering an invalid level state, wherein the MCU continuously reads three pin levels every 500us, and if the three pin levels are all low, the three pin levels are invalid levels, filtering the invalid levels;
4) and judging the voltage value of the CP signal according to the level value combination.
The above-described embodiments are merely preferred embodiments of the present invention, and general changes and substitutions by those skilled in the art within the technical scope of the present invention are included in the protection scope of the present invention.
Claims (10)
1. A CP signal voltage detection method of an electric vehicle alternating current charging system is characterized in that: the method specifically comprises the following steps:
S1, voltage comparison: the CP signal voltage value is compared with the set voltage value respectively, and high level or low level is output by comparing the voltage values of the CP signal voltage value and the set voltage value;
S2, isolating output: the high level or the low level output by the step S1 is converted into a CMOS level signal by an opto-coupler and is input to pins of the MCU respectively;
S3, sampling calculation: and reading the level state of the pin through the MCU, and inquiring to obtain the current voltage value.
2. the CP signal voltage detection method of an electric vehicle ac charging system according to claim 1, wherein: in step S1, the voltage values are set to +2.5V, +6.5V, +10V, and if the CP signal voltage value is greater than the above-mentioned constant voltage values +2.5V, +6.5V, +10V, a high level of +15V is outputted, otherwise a low level of 0V is outputted, and three level values are obtained.
3. the CP signal voltage detection method of an electric vehicle ac charging system according to claim 2, wherein: the three level values are converted into three CMOS level signals through an optical coupler, and the three CMOS level signals are input into three pins of the MCU.
4. The CP signal voltage detection method of an electric vehicle AC charging system according to claim 3, characterized in that: the sampling calculation in step S3 includes: 1) configuring the states of three pins of the MCU as input states; 2) regularly reading the input level states of the three pins; 3) filtering the invalid level state; 4) and judging the voltage value of the CP signal according to the level value combination.
5. the CP signal voltage detection method of an electric vehicle AC charging system according to claim 4, characterized in that: when the input level states of the three pins are read regularly, the input level states are recorded as 1 when the pin level is high and recorded as 0 when the pin level is low.
6. the CP signal voltage detection method of an electric vehicle AC charging system according to claim 5, characterized in that: the filtering invalid level state is that the MCU continuously reads three pin levels at a certain frequency, and if the three pin levels are all low, the three pin levels are invalid levels, the filtering invalid levels are filtered.
7. The CP signal voltage detection method of an electric vehicle AC charging system according to claim 6, characterized in that: while filtering the inactive levels, three pin levels are read every 500 us.
8. The utility model provides a CP signal voltage detection device of electric automobile alternating current charging system which characterized in that: the system comprises the following modules:
A voltage comparison module: the device is responsible for comparing the CP signal voltage value with a set voltage value and outputting a high level or a low level by comparing the magnitude of the two voltage values;
An isolation output module: the power supply is responsible for converting a high level or a low level output by the voltage comparison module into a CMOS level signal and respectively inputting the CMOS level signal into pins of the sampling calculation module;
A sampling calculation module: and the device is responsible for inquiring and obtaining the current voltage value by reading the level state of the pin.
9. The CP signal voltage detection apparatus for an ac charging system of an electric vehicle according to claim 8, wherein: the voltage comparison module is composed of three comparators, the set voltage values are +2.5V, +6.5V and +10V, and the three comparators are used for comparing respectively, when the CP signal voltage value is larger than the fixed voltage values +2.5V, +6.5V and +10V, a high level +15V is output, otherwise, a low level 0V is output, and three level values are obtained.
10. The CP signal voltage detection apparatus for an ac charging system of an electric vehicle according to claim 9, wherein: the isolation output module is three optocouplers, the sampling calculation module is an MCU, the three level values are converted into three CMOS level signals through the optocouplers, and the three CMOS level signals are input into three pins of the MCU.
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Application publication date: 20191210 |
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| RJ01 | Rejection of invention patent application after publication |