阅读说明：本技术 电动汽车及充电设备 (Electric car and charging equipment ) 是由 雷贵州 李政 王乐永 周怀俊 张小龙 于 2019-07-26 设计创作，主要内容包括：本发明提供一种电动汽车,所述电动汽车包括车辆控制装置,所述车辆控制装置包括：接收单元,用于接收脉冲宽度调制PWM信号；识别单元,用于识别所述PWM信号的预设电平信号；电流获取单元,用于根据所述预设电平信号获取当前充电电流,并且,过流阈值确定单元,用于根据所述PWM信号确定过流阈值；比较单元,用于比较所述过流阈值与所述当前充电电流；以及,发送单元,用于根据所述比较单元的比较结果生成并发送过流电平信号,实现了充电过程的过流检测。此外,本发明还提供了一种过流保护的充电设备。(The present invention provides a kind of electric car, and the electric car includes controller of vehicle, and the controller of vehicle includes: receiving unit, for receiving pulse width modulation (PWM) signal；Recognition unit, for identification predetermined level signal of the pwm signal；Electric current acquiring unit, for obtaining current charging current, also, overcurrent threshold value determination unit according to the predetermined level signal, for determining overcurrent threshold value according to the pwm signal；Comparing unit, for the overcurrent threshold value and the current charging current；And transmission unit realizes the over-current detection of charging process for generating and sending clip level signal according to the comparison result of the comparing unit.In addition, the present invention also provides a kind of charging equipments of overcurrent protection.)

1. a kind of electric car, which is characterized in that the electric car includes controller of vehicle, the controller of vehicle packet It includes:

Receiving unit, for receiving pulse width modulation (PWM) signal；

Recognition unit, for identification predetermined level signal of the pwm signal；

Electric current acquiring unit, for obtaining current charging current according to the predetermined level signal, also, overcurrent threshold value determines list Member, for determining overcurrent threshold value according to the pwm signal；

Comparing unit, for the overcurrent threshold value and the current charging current；And

Transmission unit, for generating and sending clip level signal according to the comparison result of the comparing unit.

2. electric car according to claim 1, which is characterized in that the duty ratio D of the pwm signal is greater than or equal to 8%, and it is less than or equal to 90%.

3. electric car according to claim 1, which is characterized in that the recognition unit is specifically used for: determining the PWM The duty ratio D of signal meets preset range, and identifies the predetermined level signal of the pwm signal.

4. electric car according to claim 3, which is characterized in that the duty ratio D of the pwm signal is greater than or equal to 8%, and it is less than or equal to 90%.

5. electric car according to claim 1, which is characterized in that the predetermined level signal be low level signal or High level is to low level failing edge signal.

6. electric car according to claim 5, which is characterized in that the high level is greater than 5.2V and is less than 6.8V, institute Stating low level is 0V.

7. electric car according to claim 1, which is characterized in that the recognition unit is also used to identify at least twice The predetermined level signal；The overcurrent threshold value determination unit is also used to described at least twice in identification according to the pwm signal Duty ratio D determines maximum safe current value Imax in the time interval of predetermined level signal, and, according to the maximum safety electricity Flow valuve Imax and preset rules determine overcurrent threshold value.

8. electric car according to claim 7, which is characterized in that the preset rules include: described overcurrent threshold value etc. In the maximum safe current value I_maxMultiplied by predetermined coefficient, alternatively, the overcurrent threshold value is equal to the maximum safe current value I_maxWith preset difference value and.

9. electric car according to claim 7, which is characterized in that when the duty ratio D of the pwm signal is greater than or equal to 8%, and less than 10%, the maximum safe current value I_max=6；Alternatively,

When the pwm signal duty ratio D be greater than or equal to 10%, and be less than or equal to 85%, the maximum safe current value I_max=(D*100) * 60；Alternatively,

When the pwm signal duty ratio D be greater than 85%, and be less than or equal to 90%, the maximum safe current value I_max= (D*100-64) * 2.5 and I_maxLess than or equal to 63.

10. electric car according to claim 1, which is characterized in that the transmission unit is specifically used for: working as described in determining Preceding charging current value reaches the overcurrent threshold value, is transmitted across stream level signal.

11. electric car according to claim 1, which is characterized in that the receiving unit passes through first diode and fills Electric equipment connection, the anode of the first diode is for connecting charging equipment, described in the cathode connection of the first diode Receiving unit；And/or

The transmission unit is connect by the second diode with charging equipment, and the anode of second diode connects the transmission Unit, the cathode of second diode is for connecting charging equipment.

12. a kind of charging equipment characterized by comprising

Transmit-Receive Unit, for sending pwm signal；

The Transmit-Receive Unit is also used to receive clip level signal, and the clip level signal is in response to the pwm signal；With And

Over-current protecting unit, for executing overcurrent protection according to the clip level signal.

13. charging equipment according to claim 12, which is characterized in that the duty ratio D of the pwm signal is greater than or equal to 8%, and it is less than or equal to 90%.

14. charging equipment according to claim 12, which is characterized in that the Transmit-Receive Unit is also used to: receiving level letter Number, and identifying the clip level signal in the level signal, the clip level signal is in response to the pwm signal.

15. charging equipment according to claim 14, which is characterized in that the Transmit-Receive Unit is also used to:

Level signal is received, the level signal for meeting default duration is determined in the low level sending time of the pwm signal For clip level signal, the clip level signal is in response to the pwm signal；Alternatively,

Receive level signal, by the level signal with the pwm signal compared with, determine meet preset duration and with it is described The different level signal of the high level of pwm signal is clip level signal, and the clip level signal is believed in response to the PWM Number.

16. charging equipment according to claim 12, which is characterized in that the Transmit-Receive Unit is also used to receive non-galvanic electricity excessively Ordinary mail number, the non-clip level signal is in response to the pwm signal.

17. charging equipment according to claim 12, which is characterized in that the Transmit-Receive Unit passes through first diode and vehicle The anode of the connection of control device, the first diode connects the Transmit-Receive Unit, and the cathode of the first diode is used for Connect controller of vehicle；And/or

The Transmit-Receive Unit is connect by the second diode with controller of vehicle, and the anode of second diode is for connecting The cathode of the controller of vehicle, second diode connects the Transmit-Receive Unit.

Technical field

The present invention relates to electric car charge control fields, specifically, relating generally to a kind of realization charging process overcurrent The electric car and charging equipment of detection or protection.

Background technique

With scientific and technological level and continuous improvement of people's living standards, more and more people start to buy automobile to promote life Convenience living, quality of making the life better.But ecological ring is given in being increasing due to current automobile capacity, the discharge of vehicle exhaust Border brings larger impact.In order to improve worsening ecological environment, electric car comes into being, and electric car passes through electric power Driven by energy vehicle driving is provided, will not generate vehicle exhaust in the process of moving, to reducing vehicle exhaust and improve environment Pollution has larger effect.

Electric car is greatly developed, and then has driven charging equipment, such as the related production such as charging pile, charging socket The development of industry.In the more and more parking lots for appearing in community of charging equipment, and the charging equipment in community is predominantly exchanged and is filled Electric equipment.

In charging process, charging equipment needs to take overcurrent protection measure, at present to the detection of current charging current, needs Additionally increase detection circuit in charging equipment, increase the complication of circuit, and increases power consumption.

Summary of the invention

It is an object of the invention to overcome the deficiencies of existing technologies, a kind of electricity that can be realized over-current detection or protection is provided Electrical automobile and charging equipment.

To achieve the goals above, it adopts the following technical scheme that:

In a first aspect, a kind of electric car, the electric car includes controller of vehicle, the controller of vehicle packet It includes:

Receiving unit, for receiving pulse width modulation (PWM) signal；

Recognition unit, for identification predetermined level signal of the pwm signal；

Electric current acquiring unit, for obtaining current charging current according to the predetermined level signal, also, overcurrent threshold value is true Order member, for determining overcurrent threshold value according to the pwm signal；

Comparing unit, for the overcurrent threshold value and the current charging current；And

Transmission unit is transmitted across stream level signal for the comparison result according to comparing unit.

Second aspect, a kind of charging equipment, comprising:

Transmit-Receive Unit, for sending pwm signal；

The Transmit-Receive Unit, is also used to receive clip level signal, and the clip level signal is believed in response to the PWM Number；And

Over-current protecting unit, for executing overcurrent protection according to the clip level signal.

Beneficial effects of the present invention:

Charging equipment or electric car provided by the invention, the pwm signal that charging equipment is sent to electric car work as PWM Signal in low level, the controller of vehicle of electric car obtains current current charging current, and according to pwm signal Determine overcurrent threshold value, more current charging current and overcurrent threshold value can judge charging whether overcurrent, result feedback charging is set It is standby.Do not need in the circuit of charging equipment increase newly detection circuit, can real-time detection charging process whether overcurrent, simplify The circuit challenge of over-current detection, detection effect are good at present.

Detailed description of the invention

It, below will be to use required in embodiment in order to illustrate more clearly of the technical solution of embodiment of the present invention Attached drawing be briefly described, it should be understood that the following drawings illustrates only certain embodiments of the invention, therefore should not be seen Work is limiting the scope of the invention.

Fig. 1 is the flow diagram of over-current detecting method provided in an embodiment of the present invention；

Fig. 2 is the charging connection schematic diagram of electric car provided in an embodiment of the present invention and charging equipment；

Fig. 3 is the circuit theory schematic diagram of electric car provided in an embodiment of the present invention；

Fig. 4 is the circuit theory schematic diagram of charging equipment provided in an embodiment of the present invention；

Fig. 5 is the flow diagram of over-current detecting method provided in an embodiment of the present invention；

Fig. 6 is the flow diagram of over-current protection method provided in an embodiment of the present invention；

Fig. 7 is the circuit theory schematic diagram of computer equipment provided in an embodiment of the present invention；

Fig. 8 is the circuit theory schematic diagram of readable storage medium storing program for executing provided in an embodiment of the present invention.

Specific embodiment

Hereinafter, various embodiments of the invention will be described more fully.The present invention can have various embodiments, And it can adjust and change wherein.It should be understood, however, that: it is public herein there is no various embodiments of the invention are limited to The intention for the particular implementation opened, but should invention is construed as cover the spirit for falling into various embodiments of the invention With all adjustment, equivalent and/or the optinal plan in range.

Hereinafter, the term " includes " that can be used in the various embodiments of the present invention or " may include " instruction institute are public The presence of function, operation or the element opened, and the increase of one or more functions, operation or element is not limited.In addition, such as Used in the various embodiments of the present invention, term " includes ", " having " and its cognate be meant only to indicate special characteristic, Number, step, operation, the combination of element, component or aforementioned item, and be understood not to exclude first it is one or more its Its feature, number, step, operation, the combined presence or one or more features of increase, number of element, component or aforementioned item Word, step, operation, element, component or aforementioned item combination a possibility that.

In the various embodiments of the present invention, statement " A or/and B " include the text listed file names with any combination or All combinations, such as, it may include A, it may include B or may include A and B both.

The statement (" first ", " second " etc.) used in the various embodiments of the present invention can be modified in various realities The various constituent element in mode are applied, but respective sets can not be limited into element.For example, the above statement is not intended to limit the element Sequence and/or importance.The above statement is only used for the purpose for differentiating an element and other elements.For example, first uses Family device and second user device indicate different user device, although the two is all user apparatus.For example, not departing from the present invention Various embodiments range in the case where, first element is referred to alternatively as second element, and similarly, second element can also be claimed For first element.

It should also be noted that in the present invention, unless otherwise specific regulation and definition, the arts such as " installation ", " connection ", " fixation " Language shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection or being integrally connected；It can be machine Tool connection, is also possible to be electrically connected；It can be and be directly connected to, and can be indirectly connected through an intermediary；It can be two Connection inside element.For the ordinary skill in the art, above-mentioned term can be understood at this as the case may be Concrete meaning in invention.

In the present invention, those skilled in the art are it is to be appreciated that indicating position or positional relationship in text Term be orientation based on the figure or positional relationship, be merely for convenience of description of the present invention and simplification of the description, without It is that the device of indication or suggestion meaning or element must have a particular orientation, be constructed and operated in a specific orientation, therefore It is not considered as limiting the invention.

The term used in the various embodiments of the present invention is only used for the purpose and simultaneously of description particular implementation It is not intended to limit various embodiments of the invention.Unless otherwise defined, otherwise all terms used herein (including technology Term and scientific term) have and the normally understood meaning phase of field those of ordinary skill described in various embodiments of the invention Same meaning.The term (term such as limited in the dictionary generally used) be to be interpreted as have in the relevant technologies The identical meaning of situational meaning in field and it will be interpreted as having Utopian meaning or meaning too formal, removed It is non-to be clearly defined in the various embodiments of the present invention.

The embodiment of the present invention provides a kind of overcurrent protection, and being applied particularly to charging equipment 200 is that electric car 100 charged Cheng Zhong, over-current detection or protection.

Referring to FIG. 1, disclosing the flow diagram of over-current detecting method preferred embodiment, specifically include:

Electric car 100 receives the pulse width modulation (PWM) signal issued by charging equipment 200；

Electric car 100 identifies pwm signal, when identifying the predetermined level signal in the pwm signal, obtains Current current charging current, also, overcurrent threshold value is determined according to pwm signal；

Electric car 100 compares current charging current and overcurrent threshold value, generates and sends clip level according to comparison result Signal.

Further, it after charging equipment 200 receives clip level signal, can further be carried out according to current charging current Overcurrent protection executes overcurrent protection measure, for example, the power output of shutdown charging equipment 200, reports over-current state signal etc..

Referring to FIG. 2, disclosing the charging connection structure of charging equipment 200 Yu electric car 100, the charging equipment 200 include battery charge controller 201 and power supply 202, and electric car 100 includes controller of vehicle 101 and Vehicular charger 102, battery charge controller 201 is connected by connection confirmation line (CC) and control guidance confirmation line (CP) and controller of vehicle 101 It connects, power supply 202 is connect by power supply line (L, N) with Vehicular charger 102.

Further, battery charge controller 201 passes through first diode D1 and the second diode D2 and vehicle control respectively Device 102 connects.The anode connection battery charge controller 201 of the first diode D1, cathode connect controller of vehicle 101；The anode connection controller of vehicle 101 of the second diode D2, cathode connect battery charge controller 201.

Specifically, during the charging process, battery charge controller 201 sends pwm signal to controller of vehicle 101, wherein Pwm signal is a kind of alternate waveform signal of low and high level, such as battery charge controller 201 issues the alternate PWM of 6V and -6V and believes Number, 6V and the alternate pwm signal of 0V are converted into after first diode D1, and the second diode D2 can not be passed through.

Referring to FIG. 3, the embodiment of the present invention provides a kind of electric car 100, the electric car 100 includes vehicle control Device 101, the controller of vehicle 101 include:

Receiving unit 110, for receiving pwm signal；

Recognition unit 120, for identification predetermined level signal of the pwm signal；

Electric current acquiring unit 130, for obtaining current charging current, also, overcurrent threshold according to the predetermined level signal It is worth determination unit 140, for determining overcurrent threshold value according to the pwm signal；

Comparing unit 150, for the overcurrent threshold value and the current charging current；And

Transmission unit 160, for generating and sending clip level signal according to the comparison result of the comparing unit 150.

In the present embodiment, charging equipment 200 to the pwm signal that controller of vehicle 101 is sent be that low and high level is alternate Pulse signal, wherein the accounting of high level is the duty ratio of pwm signal, embodies the control information of pwm signal, such as pwm signal Duty ratio be 5%, indicate that charging equipment 200 request to communicate with electric car 100, the duty ratio of pwm signal is 7%, expression Do not allow to charge.When recognition unit 120 identifies the low level of received pwm signal, identification instruction is passed into electric current and is obtained Unit 130, obtains current charging current, and the electric current acquiring unit 130 is straight by the internal communication of controller of vehicle 101 It connects and reads the charging current, and overcurrent threshold value determination unit 140 determines overcurrent threshold value according to pwm signal；Comparing unit 150 Current charging current and overcurrent threshold value are received, and current charging current and overcurrent threshold value are compared, comparison result is sent To transmission unit 160；Transmission unit 160 is according to structural generation clip level signal and passes to charging equipment 200, completes and fills The detection of electric overcurrent.

Further, the duty ratio D of the pwm signal is greater than or equal to 8%, and is less than or equal to 90%.Specifically, may be used To refer to " 18487.1 2015 electric car conduction charging system of GBT ", wherein the duty ratio of pwm signal is greater than or equal to 8%, and it is less than or equal to 90%, indicate charging equipment 200 and electric car 100 just in charged state.

Further, the recognition unit 120 is specifically used for: determining that the duty ratio D of the pwm signal meets default model It encloses, and identifies the predetermined level signal of the pwm signal.

In the present embodiment, recognition unit 120 also judges the duty ratio D of pwm signal, that is, when judging that pwm signal accounts for When sky ratio D indicates charge control state, predetermined level signal identification is carried out.

Further, duty ratio D preset range are as follows: be greater than or equal to 8%, and be less than or equal to 90%.

Further, in specific implementation, the predetermined level signal can be low level signal, be also possible to high level To low level failing edge signal.Wherein, the high level is greater than 5.2V and is less than 6.8V, and the low level is 0V.

Further, the recognition unit 120 is also used to identify the predetermined level signal at least twice；The overcurrent Threshold value determination unit 140 is also used to according to the pwm signal in the time interval for identifying the predetermined level signal at least twice Interior duty ratio D determines maximum safe current value Imax, and, it is determined according to the maximum safe current value Imax and preset rules Overcurrent threshold value.

Further, the preset rules include: that the overcurrent threshold value is equal to the maximum safe current value I_maxMultiplied by pre- If coefficient, alternatively, the overcurrent threshold value is equal to the maximum safe current value I_maxWith preset difference value and.

Specifically, wherein when the duty ratio D of the pwm signal is greater than or equal to 8%, and less than 10%, the maximum peace Total current value I_max=6；Alternatively,

When the duty ratio D of the pwm signal is greater than or equal to 10%, and it is less than or equal to 85%, the maximum safety electricity Flow valuve I_max=(D*100) * 60；Alternatively,

When the pwm signal duty ratio D be greater than 85%, and be less than or equal to 90%, the maximum safe current value I_max =(D*100-64) * 2.5 and I_maxLess than or equal to 63.

Further, the transmission unit 160 generates clip level letter according to the comparison result of the comparing unit 150 Number, specifically, determining that the present charging current value reaches the overcurrent threshold value, send the clip level signal.It can manage Solution, the transmission unit 160 are also used to, and determine that the current charging current is not up to the overcurrent threshold value, generation is non-to cross galvanic electricity Ordinary mail number is simultaneously sent to charging equipment.To sum up, the transmission unit 160 can be corresponded to according to comparison result generates clip level letter Number or non-clip level signal, for example, clip level signal is set as 1A, non-clip level signal is set as 2A or overcurrent Level signal is set as 1A, not transmission level signal when non-over-current state.

Further, the receiving unit 110 is connect by first diode D1 with charging equipment 200, and the described 1st The anode of pole pipe D1 connects the receiving unit 110 for connecting charging equipment 200, the cathode of the first diode D1.This In embodiment, the first diode D1 is used to filter out the negative electricity for the CP signal that charging equipment 100 is transmitted to electric car 100 It is flat.

Further, the transmission unit 150 is connect by the second diode D2 with charging equipment 200, and the described 2nd 2 The anode of pole pipe D2 connects the transmission unit 150, and the cathode of the second diode D2 is for connecting charging equipment 200.This In embodiment, the second diode D2 is used to the level signal of electric car 100 being transferred to charging equipment 200, without into Row back transfer.

Referring to FIG. 4, the embodiment of the present invention also provides a kind of charging equipment 200, comprising:

Transmit-Receive Unit 210, for sending pwm signal；

The Transmit-Receive Unit 210 is also used to receive clip level signal, and the clip level signal is believed in response to the PWM Number；And

Over-current protecting unit 230, for executing overcurrent protection according to the clip level signal.

In the present embodiment, charging equipment 200 sends pwm signal to electric car 100 by Transmit-Receive Unit 210, passes through receipts Bill member 210 receives clip level signal, and clip level signal issues by electric car 100, in response to the pwm signal, Overcurrent unit 230 executes overcurrent protection after receiving clip level signal, such as to charging stop power supply, generate reporting message into Row reports.

Further, the duty ratio D of the pwm signal is greater than or equal to 8%, and is less than or equal to 90%.

Further, in this embodiment while the Transmit-Receive Unit 210 receives clip level signal, it is also possible to connect Noise signal is received, or identical as the timing of the level signal of sending, so that Transmit-Receive Unit 210 is practical in the same period It is able to detect that multiple level signals, clip level signal is identified, improve anti-interference ability.

Specifically, a kind of embodiment is that the Transmit-Receive Unit 210 is also used to: receiving level signal, believes in the PWM Number low level sending time determine that the level signal for meeting default duration is clip level signal, the clip level letter Number in response to the pwm signal.In the present embodiment, when Transmit-Receive Unit 210 is in the low level time section for sending the pwm signal The level signal inside received is continual and steady level, identifies the duration of level signal, is continued for example whether meeting 0.1ms, if so, being judged as clip level signal.

In another embodiment, received in the high level time section for sending the pwm signal when Transmit-Receive Unit 210 Level signal, Transmit-Receive Unit 210 it is actually detected to be a level signal with oscillation, the level signal of oscillation is carried out Identification, determines clip level signal.Specifically, the Transmit-Receive Unit 210 is also used to: receiving level signal, the level is believed Number compared with the pwm signal, determines and meet default duration and the level signal different from the high level of the pwm signal For clip level signal.

Further, the Transmit-Receive Unit 210 is connect by first diode D1 with controller of vehicle 201, and described the The anode of one diode D1 connects the Transmit-Receive Unit 210, and the cathode of the first diode D1 is for connecting vehicle control dress Set 201.

Further, the Transmit-Receive Unit 210 is connect by the second diode D2 with controller of vehicle 201, and described the The anode of two diode D2 connects the receipts for connecting the controller of vehicle 201, the cathode of the second diode D2 Bill member 210.

Referring to FIG. 5, another embodiment of the present invention provides a kind of over-current detecting methods, comprising:

Step S10 receives pwm signal；

Step S20 identifies the predetermined level signal of the pwm signal；

Step S30 obtains current charging current, also, step S40 according to the predetermined level signal, according to the PWM Signal determines overcurrent threshold value；And

Step S50, the current charging current and the overcurrent threshold value, generate and send overcurrent according to comparison result Level signal.

In the present embodiment, charging equipment 200 to the pwm signal that controller of vehicle 101 is sent be that low and high level is alternate Pulse signal, wherein the accounting of high level is the duty ratio of pwm signal, embodies the control information of pwm signal, such as pwm signal Duty ratio be 5%, indicate that charging equipment 200 request to communicate with electric car 100, the duty ratio of pwm signal is 7%, expression Do not allow to charge.When recognition unit 120 identifies the low level of received pwm signal, identification instruction is passed into electric current and is obtained Unit 130, obtains current charging current, and the electric current acquiring unit 130 is straight by the internal communication of controller of vehicle 101 It connects and reads the charging current, and overcurrent threshold value determination unit 140 determines overcurrent threshold value according to pwm signal；Comparing unit 150 Current charging current and overcurrent threshold value are received, and current charging current and overcurrent threshold value are compared, comparison result is sent To transmission unit 160；Transmission unit 160 is according to structural generation clip level signal and passes to charging equipment 200, completes and fills The detection of electric overcurrent.

Further, the duty ratio D of the pwm signal is greater than or equal to 8%, and is less than or equal to 90%.The present embodiment In, the setting of the duty ratio of pwm signal as hereinbefore, repeats no more.

Further, the predetermined level signal of the identification pwm signal, comprising: determine the duty of the pwm signal Meet preset range than D, and identifies the predetermined level signal of the pwm signal.

Further, the duty ratio D of the pwm signal is greater than or equal to 8%, and is less than or equal to 90%.

Further, the predetermined level signal is low level signal or high level to low level failing edge signal.

Further, the high level is greater than 5.2V and is less than 6.8V, and the low level is 0V.

Further, the step S20 identifies that the predetermined level signal of the pwm signal includes: in the pwm signal It is middle to identify the predetermined level signal at least twice；

The step S30 determines overcurrent threshold value according to the pwm signal, comprising: is being identified extremely according to the pwm signal Duty ratio D determines maximum safe current value Imax in the time interval of few predetermined level signal described twice, and, according to described Maximum safe current value Imax and preset rules determine overcurrent threshold value.

Further, the preset rules include: that the overcurrent threshold value is equal to the maximum safe current value I_maxMultiplied by pre- If coefficient, alternatively, the overcurrent threshold value is equal to the maximum safe current value I_maxWith preset difference value and.

Specifically, when the duty ratio D of the pwm signal is greater than or equal to 8%, and less than 10%, the maximum safety electricity Flow valuve I_max=6；Alternatively,

When the duty ratio D of the pwm signal is greater than or equal to 10%, and it is less than or equal to 85%, the maximum safety electricity Flow valuve I_max=(D*100) * 60；Alternatively,

When the pwm signal duty ratio D be greater than 85%, and be less than or equal to 90%, the maximum safe current value I_max =(D*100-64) * 2.5 and I_maxLess than or equal to 63.

Further, the step S50 current charging current and the overcurrent threshold value, and according to comparison result It is transmitted across stream level signal, comprising:

Compare the present charging current value and the overcurrent threshold value, determines that the present charging current value reaches the mistake Threshold value is flowed, stream level signal is transmitted across；Alternatively, determining that the current charging current is not up to the overcurrent threshold value, non-mistake is sent Flow level signal or not transmission level signal.

Referring to FIG. 6, another embodiment of the present invention provides another over-current protection methods, comprising:

Step S10 ' sends pwm signal；

Step S20 ' receives clip level signal, and the clip level signal is in response to the pwm signal；And

Step S30 ' executes overcurrent protection according to the clip level signal.

In the present embodiment, after charging equipment 200 sends pwm signal to electric car 100, reception is sent out by electric car 200 Clip level signal out, clip level signal trigger overcurrent protection in response to the pwm signal, and charging equipment executed Flow protection act.

Further, the duty ratio D of the pwm signal is greater than or equal to 8%, and is less than or equal to 90%.

Further, the step S30 ' receives clip level signal, and the clip level signal is in response to the PWM Signal, comprising: receive level signal, and identify the clip level signal in the level signal, the clip level signal is rung Pwm signal described in Ying Yu.

Further, in an embodiment, the step receives level signal, and identifies the overcurrent in the level signal Level signal, the clip level signal is in response to the pwm signal, comprising:

Level signal is received, the level for meeting default duration is determined in the low level sending time of the pwm signal Signal is clip level signal, and the clip level signal is in response to the pwm signal.

In another embodiment, comprising: receive level signal, by the level signal compared with the pwm signal, determine full Foot presets duration and the level signal different from the high level of the pwm signal is clip level signal, described to cross galvanic electricity Ordinary mail number is in response to the pwm signal.

Further, the over-current protection method, further includes:

Step S40 ' receives non-clip level signal, and the non-clip level signal is in response to the pwm signal.

Referring to FIG. 7, another embodiment of the present invention also provides a kind of computer equipment 300, comprising: memory 310 is used In storage computer program 320；And processor 330, above-mentioned overcurrent inspection is completed for executing the computer program Survey method or over-current protection method.The computer equipment 300 can be charging pile or electric car.

Referring to FIG. 8, another embodiment of the present invention also provides a kind of computer storage medium 400, calculated for storing Machine program 410, the computer program 410, which is performed, realizes above-mentioned over-current detecting method or over-current protection method.This is deposited Storage media can be configured on charging pile or electric car.

In all examples being illustrated and described herein, any occurrence should be construed as merely illustratively, without It is as limitation, therefore, other examples of illustrative embodiments can have different values.

It should be noted that similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi It is defined in attached drawing, does not then need that it is further defined and explained in subsequent attached drawing.

Those of ordinary skill in the art will appreciate that realizing all or part of the process in above embodiment method, being can It is completed with instructing relevant hardware by computer program, the computer program can be stored in a non-volatile calculating In machine read/write memory medium, the computer program is when being executed, it may include such as the process of the embodiment of above-mentioned each method.Its In, any of memory, storage, database or other media is drawn used in each embodiment provided herein With may each comprise non-volatile and/or volatile memory.Nonvolatile memory may include read-only memory (ROM), can compile Journey ROM (PROM), electrically programmable ROM (EPROM), electrically erasable ROM (EEPROM) or flash memory.Volatile memory can Including random access memory (RAM) or external cache.By way of illustration and not limitation, RAM is in a variety of forms Can obtain, such as static state RAM (SRAM), dynamic ram (DRAM), synchronous dram (SDRAM), double data rate sdram (DDRSDRAM), Enhanced SDRAM (ESDRAM), synchronization link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic ram (DRDRAM) and memory bus dynamic ram (RDRAM) etc..

Only several embodiments of the present invention are expressed for embodiment described above, and the description thereof is more specific and detailed, but It cannot be understood as limitation of the scope of the invention.It should be pointed out that it will be apparent to those skilled in the art that can root According to technical solution described above and design, various other corresponding changes and deformation are made, and all these change And deformation all should belong within the scope of protection of the claims of the present invention.