CN209086312U - A kind of CP detection circuit applied to alternating current charging stake - Google Patents
A kind of CP detection circuit applied to alternating current charging stake Download PDFInfo
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- CN209086312U CN209086312U CN201821473155.7U CN201821473155U CN209086312U CN 209086312 U CN209086312 U CN 209086312U CN 201821473155 U CN201821473155 U CN 201821473155U CN 209086312 U CN209086312 U CN 209086312U
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Abstract
The utility model relates to a kind of CP detection circuits applied to alternating current charging stake, the utility model structure is simple, output end uses photoelectrical coupler in circuit, utilize the transmission principle of photoelectrical coupler, window comparator output level is converted into the level identified for MCU, level conversion is played, while realizing electrical isolation again.The addition of resistor R1 and capacitor C1, composition detection input filter circuit, are filtered input terminal voltage, filter out the interference that conducting wire seals in and then are improved stability.The addition of clamp diode D1 will go into window comparator voltage clamp between 0V to 12V, prevents unexpected excessively high voltage damage window comparator, enhances the reliability of system.
Description
Technical field
The utility model relates to charging equipment of electric automobile technical fields, and in particular to one kind is for electric car charging control
CP signal deteching circuit in system guiding.
Background technique
In order to alleviate global energy crisis and environmental problem, auto industry is being increasingly towards environmental protection, clean direction hair
Exhibition, national governments and Automobile Enterprises generally recognize electric car compared to orthodox car with apparent advantage and as future
The main direction of automobile.
With becoming increasingly popular for electric car, charging system for electric automobile also increasingly causes concern.Charging pile is electronic
The energy supply equipment of automobile, it is according to national standards, vehicle-mounted when carrying out conduction-type charging to electric car with alternating-current charging pile
Charger needs to receive the CC (connection confirmation) and CP (control confirmation) of alternating-current charging pile as charge control handshake.
CP detection circuit by the detection of test point 1 is judged charging interface and electric car shake hands connection status with
And abnormality, and then according to AC charging control guidance circuit state transition graph (see attached drawing 1) realize guiding state switching with
Abnormal processing.It can be seen that the CP detection circuit of electric vehicle alternating-current charging pile is the key that control guiding, reliability be will affect
Entirely charging system is reliable and safe.And the CP detection circuit of traditional electric vehicle alternating-current charging pile passes through signal condition electricity
AD mouthfuls of samplings are sent on road in turn, and isolation on the one hand cannot be achieved and anti-interference ability is weak, the square-wave signal warp of another aspect 1kHz
Crossing due to voltage spikes caused by LC filtering may cause the erroneous judgement of charged state, affect the reliability of system.
Utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art, the utility model is by the following technical programs
It realizes: a kind of CP detection circuit applied to alternating current charging stake, it is characterised in that: including CP signal input part and comparative group,
Comparative group includes the filtering for realizing input signal compared with the CP signal input unit of protection, for realizing various states
Window comparator circuit unit and photoelectric coupler isolation unit for realizing signal isolation and level conversion.
As a kind of above-mentioned preferred embodiment, the comparative group is provided with three groups, comprising: window comparator one, photoelectric coupling
Device one and I/O port output one, window comparator one realize 12V epidemic situation comparison for realizing 12V epidemic situation comparison, photoelectrical coupler one
As a result signal isolation；Window comparator two, photoelectrical coupler two and I/O port output two, window comparator two realizes 9V state ratio
Compared with photoelectrical coupler two realizes the signal isolation of 9V state comparison result；Window comparator three, photoelectrical coupler three and I/O port are defeated
Out three, window comparator three realizes that 6V epidemic situation comparison, photoelectrical coupler three realize the signal isolation of 6V state comparison result.
As a kind of above-mentioned preferred embodiment, the CP signal input unit include the input port CP, resistance R1, capacitor C1 with
And clamp diode D1, the CP signal input access resistance R1 by the input port CP, are grounded, were used for by capacitor C1 all the way
Filter external input interference；Clamp diode D1 is accessed all the way, and output ground connection in mono- tunnel clamp diode D1 is connected to 12V pull-up all the way
Power supply, for will go into window comparator voltage clamp between 0V to 12V；Another way is CP signal input unit output letter
Number.
Through the above technical solutions, resistance R1 and capacitor C1 composition input RC filter circuit, main effect is outside filtering out
The interference of portion's input, prevents error detection caused by the interference of some routes, clamp diode D1 main function is to will go into
Window comparator voltage clamp prevents unexpected excessively high voltage damage window comparator between 0V to 12V.
As a kind of above-mentioned preferred embodiment, the window comparator circuit unit includes comparator U1A, comparator U1B, electricity
Holding C2, capacitor C3, resistance R2, resistance R3, resistance R4, resistance R5, the window for realizing each state compares and the conversion of level,
Comparator U1A, No. two of comparator U1B and No. five input ports are respectively connected to by the signal that CP signal input unit exports.
Through the above technical solutions, resistance R2, R3, R4 and capacitor C2, C3 form window comparator reference voltage circuit, it is main
The effect wanted is to export bound threshold reference voltage to window comparator, and wherein the effect of C2, C3 are filtered out on reference voltage
Interference, keep reference voltage more reliable and more stable；Resistance R5 is that window comparator exports OC pull-up resistors while being also photoelectricity
Coupler inputs current-limiting resistance.
As a kind of above-mentioned preferred embodiment, the electric coupler isolated location includes photoelectrical coupler OC1, No.1 input
The output signal of window comparator circuit unit is accessed in port, secondly number port ground connection, No. three ports are grounded by resistance R6
And export, No. four ports pull up 3.3V DC power supply.
Through the above technical solutions, OC1 is photoelectrical coupler, play a part of level conversion and isolation, is by window ratio
It is converted into that low level is 0V, high level is level that 3.3V is identified for MCU compared with device output level.
Compared with prior art, defeated in circuit the beneficial effects of the utility model are: the utility model structure is simple
Outlet uses photoelectrical coupler, using the transmission principle of photoelectrical coupler, window comparator output level is converted into knowing for MCU
Other level plays level conversion, while realizing electrical isolation again.The addition of resistor R1 and capacitor C1, composition detection
Input filter circuit is filtered input terminal voltage, filters out the interference that conducting wire seals in and then is improved stability.Clamp
The addition of diode D1 will go into window comparator voltage clamp between 0V to 12V, prevent unexpected excessively high voltage damage
Window comparator enhances the reliability of system.
Detailed description of the invention
Fig. 1 is that AC charging controls guidance circuit state transition graph；
Fig. 2 is Tthe utility model system structural block diagram；
Fig. 3 is the utility model circuit diagram.
Appended drawing reference: 1- window comparator one；2- window comparator two；3- window comparator three；4- photoelectrical coupler one；
5- photoelectrical coupler two；6- photoelectrical coupler three；7-IO mouthfuls of outputs one；8-IO mouthfuls of outputs two；9-IO mouthfuls of outputs three；10-CP letter
Number input unit；11- window comparator circuit unit；12- photoelectrical coupler.
Specific embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, the present invention will be further described in detail.It should be appreciated that specific embodiment described herein is only used to explain
The utility model is not used to limit the utility model.
The CP signal deteching circuit of the utility model circuit is by will test a little 1 signal window ratio different from three
It is compared compared with device, it is subjected to electrical isolation with the side MCU signal respectively using photoelectrical coupler 12, is captured and is risen by I/O port
Along, failing edge or judge low and high level and determine 1 state in which of test point, and then determination charging interface and electric car
It shakes hands connection status.Since entire CP detection circuit is that digital signal is only carried out level conversion simultaneously by a digital conversion circuit
Signal isolation is carried out by photoelectrical coupler 12, enhance the anti-interference ability of signal and then improves the reliability of system, together
When relative to using analog signal isolating sampling plan have apparent cost advantage.
As shown, the utility model provides a kind of CP detection circuit applied to alternating current charging stake, it is characterised in that:
Including CP signal input part and comparative group, comparative group includes that the CP signal input of filtering with the protection for realizing input signal is single
First 10, turn for realizing the window comparator circuit unit 11 of the comparison of various states and for realizing signal isolation and level
The photoelectric coupler isolation unit changed.
As a kind of above-mentioned preferred embodiment, the comparative group is provided with three groups, comprising: window comparator 1, photoelectric coupling
Device 1 and I/O port output 1, window comparator 1 realize 12V state for realizing 12V epidemic situation comparison, photoelectrical coupler 1
The signal isolation of comparison result；Window comparator 22, photoelectrical coupler 25 and I/O port output 28, window comparator 22 is realized
9V epidemic situation comparison, photoelectrical coupler 25 realize the signal isolation of 9V state comparison result；Window comparator 33, photoelectrical coupler
36 and I/O port output 39, window comparator 33 realize 6V epidemic situation comparison, photoelectrical coupler 36 realize 6V state comparison result
Signal isolation.
As a kind of above-mentioned preferred embodiment, the CP signal input unit 10 include the input port CP, resistance R1, capacitor C1 with
And clamp diode D1, the CP signal input access resistance R1 by the input port CP, are grounded all the way by capacitor C1, for filtering
External input interference；Clamp diode D1 is accessed all the way, and output ground connection in mono- tunnel clamp diode D1 is connected to 12V pull-up electricity all the way
Source, for will go into window comparator voltage clamp between 0V to 12V；Another way is the output letter of CP signal input unit 10
Number.
Through the above technical solutions, resistance R1 and capacitor C1 composition input RC filter circuit, main effect is outside filtering out
The interference of portion's input, prevents error detection caused by the interference of some routes, clamp diode D1 main function is to will go into
Window comparator voltage clamp prevents unexpected excessively high voltage damage window comparator between 0V to 12V.
As a kind of above-mentioned preferred embodiment, the window comparator circuit unit 11 include comparator U1A, comparator U1B,
Capacitor C2, capacitor C3, resistance R2, resistance R3, resistance R4, resistance R5, the window for realizing each state compares and turn of level
It changes, comparator U1A, No. two of comparator U1B and No. five input ports is respectively connected to by the signal that CP signal input unit 10 exports.
Through the above technical solutions, resistance R2, R3, R4 and capacitor C2, C3 form window comparator reference voltage circuit, it is main
The effect wanted is to export bound threshold reference voltage to window comparator, and wherein the effect of C2, C3 are filtered out on reference voltage
Interference, keep reference voltage more reliable and more stable；Resistance R5 is that window comparator exports OC pull-up resistors while being also photoelectricity
Coupler 12 inputs current-limiting resistance.
As a kind of above-mentioned preferred embodiment, the electric coupler isolated location includes photoelectrical coupler 12OC1, No.1
Input port accesses the output signal of window comparator circuit unit 11, secondly number port ground connection, No. three ports pass through resistance
R6 is grounded and exports, and No. four ports pull up 3.3V DC power supply.
Through the above technical solutions, OC1 is photoelectrical coupler 12, play a part of level conversion and isolation, is by window
Comparator output level is converted into that low level is 0V, high level is level that 3.3V is identified for MCU.
Utility model works process are as follows: starting alternating-current charging pile (i.e. charging equipment) first, MCU will be issued at this time
The level of one+12V judges charging gun and vehicle connection status by the output detection to CP signal deteching circuit unit, if
Connection is normal, and MCU detects corresponding 9V state at this time, on the contrary then detect 12V state；
Secondly after connecting normally, alternating-current charging pile (i.e. charging equipment) will pass through PWM according to the size of own power and send out
Wave unit sends the square wave of a positive and negative 12V, if charging equipment is ready, MCU detects corresponding 9V PWM wave at this time
State, if EV it is ready will closure switch S2, MCU detects 6V PWM wave state at this time, shows to be in and normally fill
Electricity condition.
In case of abnormality, MCU detects that state becomes non-6V, 9V, 12V at this time, should disconnect function immediately at this time
Rate circuit stops charging and giving a warning.
| CP signal condition | 1 output state of window comparator | 2 output state of window comparator | 3 output state of window comparator |
| 12V state | High level state | Low level state | Low level state |
| 9V state | Low level state | High level state | Low level state |
| 6V state | Low level state | Low level state | High level state |
| 12V PWM state | PWM state | Low level state | Low level state |
| 9V PWM state | Low level state | PWM state | Low level state |
| 6V PWM state | Low level state | Low level state | PWM state |
1 the utility model input/output state of table corresponds to table
In the description of the present invention, unless otherwise clearly defined and limited, term " connected ", " connection " should be done extensively
Reason and good sense solution may be a detachable connection for example, it may be being fixedly connected, or integral；It can be mechanical connection, it can also be with
It is electrical connection；Can be directly connected, can also indirectly connected through an intermediary, can be connection inside two elements or
The interaction relationship of two elements.For the ordinary skill in the art, above-mentioned term can be understood with concrete condition
Concrete meaning in the present invention.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
Made any modifications, equivalent replacements, and improvements etc., should be included in the utility model within the spirit and principle of utility model
Protection scope within.
Claims (3)
1. a kind of CP detection circuit applied to alternating current charging stake, it is characterised in that: including CP signal input part and comparative group,
Comparative group includes the CP signal input unit (10) of filtering and the protection for realizing input signal, for realizing various states
The window comparator circuit unit (11) compared and the photoelectric coupler isolation list for realizing signal isolation and level conversion
Member；
Wherein, the comparative group is provided with three groups, comprising: window comparator one (1), photoelectrical coupler one (4) and I/O port output
One (7), window comparator one (1) realize 12V state comparison result for realizing 12V epidemic situation comparison, photoelectrical coupler one (4)
Signal isolation；
Window comparator two (2), photoelectrical coupler two (5) and I/O port export two (8), and window comparator two (2) realizes 9V state
Compare, photoelectrical coupler two (5) realizes the signal isolation of 9V state comparison result；
Window comparator three (3), photoelectrical coupler three (6) and I/O port export three (9), and window comparator three (3) realizes 6V state
Compare, photoelectrical coupler three (6) realizes the signal isolation of 6V state comparison result；
The CP signal input unit (10) includes the input port CP, resistance R1, capacitor C1 and clamp diode D1, the CP letter
Number by the input port CP input access resistance R1,
It is grounded all the way by capacitor C1, is used for filtering external input nonlinearities；
Clamp diode D1 is accessed all the way, and output ground connection in mono- tunnel clamp diode D1 is connected to 12V pull-up power supply all the way, and being used for will
Window comparator voltage clamp is entered between 0V to 12V；
Another way is CP signal input unit (10) output signal.
2. the CP detection circuit according to claim 1 applied to alternating current charging stake, it is characterised in that: the window ratio
It include comparator U1A, comparator U1B, capacitor C2, capacitor C3, resistance R2, resistance R3, resistance R4, electricity compared with device circuit unit (11)
R5 is hindered, the window for realizing each state compares and the conversion of level, is distinguished by the signal of CP signal input unit (10) output
Access No. two and No. five input ports of comparator U1A, comparator U1B.
3. the CP detection circuit according to claim 1 applied to alternating current charging stake, it is characterised in that: the photoelectricity coupling
Clutch isolated location includes photoelectrical coupler (12) OC1, and No.1 input port accesses window comparator circuit unit (11)
Output signal, secondly number port ground connection, No. three ports are grounded and are exported by resistance R6, No. four ports pull up 3.3V direct current
Power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821473155.7U CN209086312U (en) | 2018-09-10 | 2018-09-10 | A kind of CP detection circuit applied to alternating current charging stake |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821473155.7U CN209086312U (en) | 2018-09-10 | 2018-09-10 | A kind of CP detection circuit applied to alternating current charging stake |
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| Publication Number | Publication Date |
|---|---|
| CN209086312U true CN209086312U (en) | 2019-07-09 |
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| CN201821473155.7U Active CN209086312U (en) | 2018-09-10 | 2018-09-10 | A kind of CP detection circuit applied to alternating current charging stake |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110549879A (en) * | 2019-09-10 | 2019-12-10 | 山东浪潮人工智能研究院有限公司 | CP signal voltage detection method and device of electric vehicle alternating current charging system |
| CN111452640A (en) * | 2020-04-13 | 2020-07-28 | 北京和信瑞通电力技术股份有限公司 | Electrical charging gun homing detection circuit and method |
| EP3890147A1 (en) * | 2020-02-04 | 2021-10-06 | Phihong Technology Co., Ltd. | Circuit and method for detecting abnormality of control pilot signal of a dc charging pile |
-
2018
- 2018-09-10 CN CN201821473155.7U patent/CN209086312U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110549879A (en) * | 2019-09-10 | 2019-12-10 | 山东浪潮人工智能研究院有限公司 | CP signal voltage detection method and device of electric vehicle alternating current charging system |
| EP3890147A1 (en) * | 2020-02-04 | 2021-10-06 | Phihong Technology Co., Ltd. | Circuit and method for detecting abnormality of control pilot signal of a dc charging pile |
| CN111452640A (en) * | 2020-04-13 | 2020-07-28 | 北京和信瑞通电力技术股份有限公司 | Electrical charging gun homing detection circuit and method |
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