CN109664841A - A kind of high voltage interlock circuit, fault detection method and device - Google Patents
A kind of high voltage interlock circuit, fault detection method and device Download PDFInfo
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- CN109664841A CN109664841A CN201811488118.8A CN201811488118A CN109664841A CN 109664841 A CN109664841 A CN 109664841A CN 201811488118 A CN201811488118 A CN 201811488118A CN 109664841 A CN109664841 A CN 109664841A
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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Abstract
The invention discloses a kind of high voltage interlock circuit, fault detection method and device, the high voltage interlock circuits, comprising: detection branch, first resistor network, second resistance network and constant-current source；Detection branch includes the 3rd resistor network and high voltage interface being connected in series；After detection branch is in parallel with first resistor network, with second resistance series network between the positive output end and negative output terminal of constant-current source, so that first detection module judges the failure in high voltage interface circuit according to the voltage of constant-current source positive output end, the failure in high voltage interface circuit can be judged according to the voltage of positive output end, realize the detection to high voltage interface circuit integrality.
Description
Technical field
This application involves automobile technical field more particularly to a kind of high voltage interlock circuits, fault detection method and device.
Background technique
High-voltage interlocking (High Voltage Inter-lock, HVIL) is a kind of low-voltage signal monitoring high voltage interface time
The Security Design Methods of road integrality.Currently, usually utilizing microcontroller when detecting to high voltage interface circuit integrality
Unit (Microcontroller Unit, MCU) output pulse width is modulated (Pulse-Width Modulation, PWM) wave and is carried out
Detection.
In a kind of existing high-voltage interlocking circuit, MCU to one end of high voltage interface export PWM wave, when high-voltage connector just
Often when being connected at high voltage interface, MCU can receive the PWM wave of return, high voltage interface circuit in the other end of high voltage interface
Completely.Once MCU does not receive the PWM wave of return, then it can determine high voltage interface loop fault, to realize to high-voltage connecting
The detection of mouth circuit integrality.
But existing technical solution can only determine that high voltage interface circuit is turned on or off, and can not determine high pressure
The specific failure mode that interface loop occurs, is unfavorable for subsequent investigation and processing to high voltage interface loop fault.
Summary of the invention
In order to solve prior art problem, the embodiment of the present application provides a kind of high voltage interlock circuit, fault detection method
And device, it can recognize that the specific failure problems in high voltage interface circuit, distinguish the short circuit of high voltage interface circuit, be shorted over the ground still
Power supply is shorted, the efficiency of troubleshooting is improved.
A kind of high voltage interlock circuit provided by the embodiments of the present application, comprising: detection branch, first resistor network, the second electricity
Hinder network and constant-current source；
The detection branch includes the 3rd resistor network and high voltage interface being connected in series；
After the detection branch is in parallel with the first resistor network, with the second resistance series network in the constant current
Between the positive output end and negative output terminal in source, so that first detection module judges height according to the voltage of the constant-current source positive output end
Press the failure of interface loop.
Optionally, the second resistance network includes that first resistor and second resistance is connected in series, so that the second detection mould
Root tuber judges the working condition of the constant-current source according to the voltage of the first resistor and the intermediate node of the second resistance.
Optionally, the first resistor network, comprising: 3rd resistor；The 3rd resistor network, comprising: the 4th resistance；
The first end of the 3rd resistor connects the positive output end of the constant-current source, the second end connection of the 3rd resistor
The first end of the first resistor；
The second end of the first resistor connects the second detection module, and connects the constant-current source through the second resistance
Negative output terminal, so that second detection module judges according to the voltage of the first resistor and the intermediate node of the second resistance
The working condition of the constant-current source；
The first end of 4th resistance connects the positive output end of the constant-current source, the 4th electricity through the high voltage interface
The second end of resistance connects the first end of the first resistor.
Optionally, the positive output end output electric current of the constant-current source is the negative output terminal of the constant-current source greater than 10 milliamperes
Ground connection；
The resistance value of the first resistor and the second resistance is 100 ohm, the 3rd resistor and the 4th electricity
The resistance value of resistance is 330 ohm.
Optionally, further includes: partial pressure branch；
The partial pressure branch is divided for the voltage to the constant-current source positive output end, obtains detection voltage, so that
The first detection module judges the failure in the high voltage interface circuit according to the detection voltage.
Optionally, the bleeder circuit, specifically includes: the 5th resistance and the 6th resistance；
The first end of 5th resistance connects the positive output end of the constant-current source；
The second end of 5th resistance connects the first detection module, and connects the constant current through the 6th resistance
The negative output terminal in source.
Optionally, the voltage value of the detection voltage is no more than 5V.
Optionally, further includes: diode and/or capacitor；
The anode of the diode connects the positive output end of the constant-current source, and the cathode of the diode connects the detection
Branch；
The first end of the capacitor is connected between the high voltage interface and the 3rd resistor, the second end of the capacitor
Connect the negative output terminal of the constant-current source.
A kind of fault detection method provided by the embodiments of the present application is applied to such as high-voltage interlocking electricity provided by the above embodiment
Any one in road；The method, comprising:
The voltage for obtaining the constant-current source positive output end, obtains sampled voltage；
Determine voltage range described in sampled voltage described in the allocation list being previously obtained；It include multiple in the allocation list
The one-to-one relationship of the connection status in voltage range and high voltage interface circuit, each voltage range are not overlapped；
According to the connection status in high voltage interface circuit corresponding to the voltage range determined, high voltage interface circuit is judged
Failure.
A kind of fault detection means provided by the embodiments of the present application is applied to such as high-voltage interlocking electricity provided by the above embodiment
Any one in road；Described device, comprising: data capture unit, range lookup unit and breakdown judge unit；
The data capture unit obtains sampled voltage for obtaining the voltage of the constant-current source positive output end；
The range lookup unit, for determining voltage zone described in sampled voltage described in the allocation list being previously obtained
Between；It include the one-to-one relationship of the connection status in multiple voltage ranges and high voltage interface circuit, Mei Gesuo in the allocation list
Voltage range is stated not to be overlapped；
The breakdown judge unit, the connection shape for the high voltage interface circuit according to corresponding to the voltage range determined
State judges the failure in high voltage interface circuit.
Compared with prior art, the application has at least the following advantages:
In the embodiment of the present application, high voltage interface and 3rd resistor series network obtain detection branch and first resistor network
After parallel connection, it is connected between the positive output end of constant-current source and negative output terminal together with second resistance network, due to high-voltage connecting
The variation of mouthful connection status, it is such as normal connection, breaking, breaking over the ground and to external power supply short circuit, the positive output end of constant-current source
The voltage at place can also convert therewith, and the failure in high voltage interface circuit is judged so as to the voltage according to positive output end, realize
Detection to high voltage interface circuit integrality.
Detailed description of the invention
In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The some embodiments recorded in application, for those of ordinary skill in the art, without creative efforts,
It can also be obtained according to these attached drawings other attached drawings.
Fig. 1 is a kind of structural schematic diagram of high voltage interlock circuit provided by the embodiments of the present application；
Fig. 2 is a kind of circuit topology for high voltage interlock circuit that the application specific embodiment provides；
Fig. 3 is the circuit topology for another high voltage interlock circuit that the application specific embodiment provides
Fig. 4 a- Fig. 4 e is that a kind of high voltage interlock circuit that the application specific embodiment provides connects shape in high voltage interface difference
Schematic diagram under state；
Fig. 5 is the circuit topology for another high voltage interlock circuit that the application specific embodiment provides；
Fig. 6 is a kind of flow diagram of fault detection method provided by the embodiments of the present application；
Fig. 7 is a kind of structural schematic diagram of fault detection means provided by the embodiments of the present application.
Specific embodiment
In order to make those skilled in the art more fully understand application scheme, below in conjunction in the embodiment of the present application
Attached drawing, the technical scheme in the embodiment of the application is clearly and completely described, it is clear that described embodiment is only this
Apply for a part of the embodiment, instead of all the embodiments.Based on the embodiment in the application, those of ordinary skill in the art exist
Every other embodiment obtained under the premise of creative work is not made, shall fall in the protection scope of this application.
It should be appreciated that in this application, " at least one (item) " refers to one or more, and " multiple " refer to two or two
More than a."and/or" indicates may exist three kinds of relationships, for example, " A and/or B " for describing the incidence relation of affiliated partner
It can indicate: only exist A, only exist B and exist simultaneously tri- kinds of situations of A and B, wherein A, B can be odd number or plural number.Word
Symbol "/" typicallys represent the relationship that forward-backward correlation object is a kind of "or"." at least one of following (a) " or its similar expression, refers to
Any combination in these, any combination including individual event (a) or complex item (a).At least one of for example, in a, b or c
(a) can indicate: a, b, c, " a and b ", " a and c ", " b and c ", or " a and b and c ", and wherein a, b, c can be individually, can also
To be multiple.
It should be noted that high voltage interlock circuit provided by the embodiments of the present application and its fault detection method and device, no
It can be only used for connecting hybrid vehicle, electric vehicle etc. by the vehicles mesohigh interface that power battery provides power
The detection for connecing state (i.e. high voltage interface circuit integrality) can be also used for other equipment high voltage interfaces circuit mesohigh interface
The detection of connection status, the application without limiting, say this by electric car below for this specific scene
Bright, the implementation of other scenes is similar, no longer repeats one by one here.
It is provided by the embodiments of the present application in order to detect the connection status of high voltage interface, identify the failure in high voltage interface circuit
High voltage interlock circuit is by specific resistor network connection status, so that constant-current source is being just in the connection status difference of high voltage interface
The voltage range of output end is different, so as to be realized to high voltage interface just according to the voltage of the constant-current source positive output end of detection
Normal connection, open circuit, shorted to earth, the detection to states such as external power supply short circuits.
Based on above-mentioned thought, in order to make the above objects, features, and advantages of the present application more apparent, below with reference to
Attached drawing is described in detail the specific embodiment of the application.
Referring to Fig. 1, which is a kind of structural schematic diagram of high voltage interlock circuit provided by the embodiments of the present application.
High voltage interlock circuit provided by the embodiments of the present application, comprising: detection branch 100, first resistor network 200, second
Resistor network 300 and constant-current source 400；
Detection branch 100 includes the 3rd resistor network 500 and high voltage interface 600 being connected in series；
After detection branch 100 is in parallel with first resistor network 200, constant-current source 400 is connected on second resistance network 300
Between positive output end and negative output terminal, so that first detection module 701 judges high pressure according to the voltage of 400 positive output end of constant-current source
The connection status of interface loop.
It is understood that the positive output end of constant-current source 400 is the output end of positive voltage or forward current, negative output terminal can
To be the output end or ground of negative voltage or reverse current.
In the embodiment of the present application, for high voltage interface 600 for connecting high-voltage connector, high-voltage connector is by conducting wire and uses
Electric equipment connection, constitutes high voltage interface circuit, realizes the power supply to electrical equipment.In use, by extraneous or equipment sheet
The influence of body factor may occur in which normal connection, open circuit, shorted to earth and to connection status such as power supply short circuits at high voltage interface 600,
The resistance and/or voltage for leading to high voltage interface 600 change, the voltage that the positive output end of constant-current source 400 detects also can be with
Variation, so as to judge the failure in high voltage interface circuit.
Specifically, the resistance of high voltage interface 600 is equal to high-voltage connector link circuit when high voltage interface circuit is normal
Equivalent resistance, the resistance value of detection branch 100 is the resistance value of 3rd resistor network 500 and the equivalent resistance in high voltage interface circuit
The sum of.When high voltage interface circuit is in off state, connection at high voltage interface 600 is disconnected, the resistance value of detection branch 100 without
Limit is big.When high voltage interface circuit shorted to earth, high voltage interface 600 is equivalent to ground connection, resistance zero, the electricity of detection branch 100
Resistance is equal to the resistance value of 3rd resistor network 500 and connection relationship changes, and detection branch 100 and second resistance network 300 are simultaneously
Connection and first resistor network 200 are connected between the positive output end and negative output terminal of constant-current source 400.When high voltage interface circuit pair
When external power supply (such as external battery) is short-circuit, high voltage interface 600 connects external power supply anode, be equivalent to constant-current source 400 just
Output end increases constant pressure source.Be connected in detection branch 100 external power supply, resistance value be 3rd resistor network 500 resistance value and
The sum of the equivalent resistance in high voltage interface circuit, the voltage at 400 positive output end of constant-current source are approximately equal to the voltage of external power supply.
Therefore, by the variation of detection branch 100 resistance and/or voltage under different connection status, constant current can be made
The voltage of 400 positive output end of source is in different voltage ranges under the different conditions in high voltage interface circuit, so as to so that the
One detection module 701 judges the failure in high voltage interface circuit according to the voltage of 400 positive output end of constant-current source, guarantees electronic
The normal work and operation of automobile.It is described in detail below in conjunction with specific embodiment, does not repeat first here.Practical application
In, first detection module 701 can be the MCU of electric car.
In the embodiment of the present application, high voltage interface and 3rd resistor series network obtain detection branch and first resistor network
After parallel connection, it is connected between the positive output end of constant-current source and negative output terminal together with second resistance network, due to high-voltage connecting
The variation of mouthful connection status, it is such as normal connection, breaking, breaking over the ground and to external power supply short circuit, the positive output end of constant-current source
The voltage at place can also convert therewith, and the failure in high voltage interface circuit is judged so as to the voltage according to positive output end, realize
Detection to high voltage interface circuit integrality.
Below will with a specific example, to high voltage interlock circuit provided by the embodiments of the present application and its working principle into
Row is described in detail.
Referring to fig. 2, which is the circuit topology for the high voltage interlock circuit that the application specific embodiment provides.
In some possible implementations of the embodiment of the present application, first resistor network 200 be can specifically include: third
Resistance R3；Second resistance network 300, can specifically include: the 7th resistance R7；3rd resistor network 500, can specifically include:
4th resistance R4；
The positive output end of the first end connection constant-current source 400 of 3rd resistor R3, the second end of 3rd resistor R3 is through the 7th electricity
Hinder R7 ground connection；
The first end of 4th resistance R4 connects the positive output end of constant-current source 400 through high voltage interface 600, and the of the 4th resistance R4
The second end of two ends connection 3rd resistor R3.
It is provided in some possible implementations in the embodiment of the present application, as shown in figure 3, second resistance network 300 may be used also
First resistor R1 and second resistance R2 is connected in series to include so that the second detection module 702 can according to first resistor R1 and
The voltage of the intermediate node of second resistance R2 judges the working condition of constant-current source 400.As an example, first resistor R1 and
The resistance value of two resistance R2 all can be 100 ohm.
It is understood that since the voltage of the intermediate node of first resistor R1 and second resistance R2 is not returned by high voltage interface
The influence of the connection status on road flows through first resistor R1 and the place second resistance R2 with the curent change that constant-current source 400 exports
The electric current of branch can also change therewith, so as to according to the voltage of the intermediate node of first resistor R1 and second resistance R2 to constant current
Source 400 exports current conditions and is detected, and judges whether constant-current source 400 works normally, and also ensures that and returns to high voltage interface
The accuracy of road breakdown judge.
In some possible designs, in order to protect device safe, high voltage interlock circuit provided by the embodiments of the present application is also
It may include: diode D and/or capacitor C；
The positive output end of the anode connection constant-current source 400 of diode D, cathode connect the 4th resistance R4 through high voltage interface 600
First end；
Capacitor C is connected between the first end of the 4th resistance R4 and the negative output terminal of constant-current source 400.
Below by Fig. 2 shows circuit topology for, it is former to the work of high voltage interlock circuit provided by the embodiments of the present application
Reason is illustrated.
When high voltage interface circuit is in normal connection status, as shown in fig. 4 a, circuit is normally connected, high voltage interface 600
Place is equivalent to the equivalent resistance R8 for being connected with high voltage interface circuit, and detection branch 100 includes concatenated equivalent resistance R8 and the 4th
Resistance R4.After the one part of current that constant-current source 400 exports will flow through series equivalent resistance R8 and the 4th resistance R4, with 3rd resistor
R3 forms parallel relationship, flows into ground finally by the 7th resistance R7.
When high voltage interface circuit is in off state, as shown in Figure 4 b, the connection of high voltage interface 600 is disconnected, detection branch
100 resistance value is infinitely great, and the electric current that constant-current source 400 exports directly flows into ground through 3rd resistor R3 and the 7th resistance R7.
When high voltage interface circuit is in shorted to earth, as illustrated in fig. 4 c, high voltage interface 600 is grounded, and constant-current source 400 exports
Electric current after 3rd resistor R3, one part of current flows into ground through the 4th resistance R4, and another part electric current flows through the 7th resistance R7
Enter ground.
When high voltage interface circuit is in external power supply short circuit, high voltage interface 600 connects external power supply anode, is equivalent to
External power supply is connected in detection branch 100, the voltage at 400 positive output end of constant-current source is approximately equal to the voltage of external power supply.And
According to the difference of connection, the 4th resistance R4 and the 7th resistance R7 that the output of external power supply is concatenated flow into ground, such as Fig. 4 d
It is shown；Alternatively, equivalent resistance R8, the 4th resistance R4 and the 7th resistance R7 that the output of external power supply is concatenated flow into ground, such as scheme
Shown in 4e.And the electric current that constant-current source 400 exports directly flows into ground through 3rd resistor R3 and the 7th resistance R7.
Through above-mentioned analysis it is found that when high voltage interface circuit is in different connection status, the positive output of constant-current source 400
Resistance value between end and negative output terminal is different.It is just defeated with constant-current source 400 since the electric current that constant-current source 400 exports is constant
The voltage value of the variation of resistance value between outlet and negative output terminal, 400 positive output end of constant-current source also changes therewith, to also can
It normally connected with distinguishing high voltage interface circuit, connect disconnection, shorted to earth and the connection status different to power supply short circuit etc..
There is also the need to explanations, since in practical applications, the equivalent resistance in high voltage interface circuit is by conducting wire oxygen
The influence of the service conditions such as change, resistance value maximum can reach 1000 Ω.In order to guarantee can to distinguish according to the voltage detected
The connection status of high voltage interface 600, in one example, the output electric current of constant-current source 400 can be greater than 10 milliamperes (mA), such as
12.5mA, 15mA etc., the resistance value of the 7th resistance R7 can be 200 ohm, the resistance value of 3rd resistor R3 and the 4th resistance R4
Think 330 ohm.
It is provided in some possible implementations in the embodiment of the present application, as shown in figure 5, constant-current source 400 is being just in order to prevent
The voltage of output end detection causes first detection module 701 to damage, which can also include: partial pressure branch 800；
Branch 800 is divided, is divided for the voltage to 400 positive output end of constant-current source, detection voltage is obtained, so that the
One detection module 701 judges the connection status of high voltage interface 600 according to detection voltage.
In practical applications, the voltage value of obtained detection voltage can be limited to be no more than 5V, to avoid the first inspection
Module 701 is surveyed to damage.
As an example, bleeder circuit 800 can specifically include: the 5th resistance R5 and the 6th resistance R6；
The positive output end of the first end connection constant-current source 400 of 5th resistance R5；
The second end of 5th resistance R5 connects first detection module 701, and negative through the 6th resistance R6 connection constant-current source 400
Output end.
In practical applications, the resistance value of the 5th resistance R5 can be 180 kilohms, and the resistance value of the 6th resistance R6 can be
100 kilohms.
It should be noted that being not construed as actually answering the limitation of the application implementation the above is only exemplary illustration
, can be according to concrete application scene and the difference in high voltage interface circuit in, size of current to constant pressure source output and each
The resistance value of a resistance is specifically set, and will not enumerate here.
The high voltage interlock circuit provided based on the above embodiment, the embodiment of the present application also provides a kind of fault detection sides
Method.
Fault detection method provided by the embodiments of the present application, applied in high voltage interlock circuit provided by the above embodiment
Any one, can specifically be executed by the MCU of electric car or other controllers, here without limiting.
Referring to Fig. 6, which is a kind of flow diagram of fault detection method provided by the embodiments of the present application.
Fault detection method provided by the embodiments of the present application, comprising:
S601: the voltage of constant-current source positive output end is obtained, sampled voltage is obtained；
S602: the voltage range of sampled voltage in the allocation list being previously obtained is determined；It include multiple voltage zones in allocation list
Between one-to-one relationship with the connection status of high voltage interface, each voltage range is not overlapped；
It is illustrated by taking the circuit topology shown in Fig. 5 as an example, wherein the resistance value of 3rd resistor R3 and the 4th resistance R4 is
300 ohm, the 7th resistance R7 is 200 ohm, and the resistance value of the 5th resistance R5 is 180 kilohms, and the resistance value of the 6th resistance R6 is 100
Kilohm, the allocation list being previously obtained can be as shown in the table:
| The connection status in high voltage interface circuit | Voltage range |
| Normal connection | (- ∞, 1.85V) |
| Connection disconnects | [1.85V, 2.7V) |
| Shorted to earth | [2.7V, 3V) |
| To external power supply short circuit | [3V, 4.7V) |
S603: according to the connection status in high voltage interface circuit corresponding to the voltage range determined, judge high voltage interface
The failure in circuit.
The high voltage interlock circuit and fault detection method provided based on the above embodiment, the embodiment of the present application also provides one
Kind fault detection means.
Fault detection means provided by the embodiments of the present application, applied in high voltage interlock circuit provided by the above embodiment
Any one, the MCU or other controllers that specifically can be only fitted to electric car are executed, here without limiting.
Referring to Fig. 7, which is a kind of structural schematic diagram of fault detection means provided by the embodiments of the present application.
Fault detection means provided by the embodiments of the present application, comprising: data capture unit 10, range lookup unit 20 and event
Hinder judging unit 30；
Data capture unit 10 obtains sampled voltage for obtaining the voltage of constant-current source positive output end；
Range lookup unit 20, for determining the voltage range of sampled voltage in the allocation list being previously obtained；In allocation list
One-to-one relationship including multiple voltage ranges Yu the connection status in high voltage interface circuit, each voltage range are not overlapped；
Breakdown judge unit 30, the connection shape for the high voltage interface circuit according to corresponding to the voltage range determined
State judges the failure in high voltage interface circuit.
It should be noted that each embodiment in this specification is described in a progressive manner, each embodiment emphasis is said
Bright is the difference from other embodiments, and the same or similar parts in each embodiment may refer to each other.For reality
For applying system or device disclosed in example, since it is corresponded to the methods disclosed in the examples, so description is fairly simple, it is related
Place is referring to method part illustration.
It should also be noted that, herein, relational terms such as first and second and the like are used merely to one
Entity or operation are distinguished with another entity or operation, without necessarily requiring or implying between these entities or operation
There are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant are intended to contain
Lid non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or equipment including the element.
The step of method described in conjunction with the examples disclosed in this document or algorithm, can directly be held with hardware, processor
The combination of capable software module or the two is implemented.Software module can be placed in random access memory (RAM), memory, read-only deposit
Reservoir (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technology
In any other form of storage medium well known in field.
The above is only the preferred embodiment of the application, not makes any form of restriction to the application.Though
Right the application has been disclosed in a preferred embodiment above, however is not limited to the application.It is any to be familiar with those skilled in the art
Member, in the case where not departing from technical scheme ambit, all using the methods and technical content of the disclosure above to the application
Technical solution makes many possible changes and modifications or equivalent example modified to equivalent change.Therefore, it is all without departing from
The content of technical scheme, any simple modification made to the above embodiment of the technical spirit of foundation the application are equal
Variation and modification, still fall within technical scheme protection in the range of.
Claims (10)
1. a kind of high voltage interlock circuit characterized by comprising detection branch, first resistor network, second resistance network and perseverance
Stream source；
The detection branch includes the 3rd resistor network and high voltage interface being connected in series；
After the detection branch is in parallel with the first resistor network, with the second resistance series network in the constant-current source
Between positive output end and negative output terminal, so that first detection module judges high-voltage connecting according to the voltage of the constant-current source positive output end
The failure in mouth circuit.
2. high voltage interlock circuit according to claim 1, which is characterized in that
The second resistance network includes that first resistor and second resistance is connected in series, so that the second detection module is according to described the
The voltage of the intermediate node of one resistance and the second resistance, judges the working condition of the constant-current source.
3. high voltage interlock circuit according to claim 2, which is characterized in that the first resistor network, comprising: third electricity
Resistance；The 3rd resistor network, comprising: the 4th resistance；
The first end of the 3rd resistor connects the positive output end of the constant-current source, described in the second end connection of the 3rd resistor
The first end of first resistor；
The second end of the first resistor connects the second detection module, and it is defeated through the second resistance to connect bearing for the constant-current source
Outlet, so that second detection module is according to the judgement of the voltage of the first resistor and the intermediate node of the second resistance
The working condition of constant-current source；
The first end of 4th resistance connects the positive output end of the constant-current source through the high voltage interface, the 4th resistance
Second end connects the first end of the first resistor.
4. high voltage interlock circuit according to claim 3, which is characterized in that
The positive output end output electric current of the constant-current source is greater than 10 milliamperes, and the negative output terminal of the constant-current source is grounded；
The resistance value of the first resistor and the second resistance is 100 ohm, the 3rd resistor and the 4th resistance
Resistance value is 330 ohm.
5. high voltage interlock circuit according to any one of claims 1-4, which is characterized in that further include: partial pressure branch；
The partial pressure branch is divided for the voltage to the constant-current source positive output end, detection voltage is obtained, so that described
First detection module judges the failure in the high voltage interface circuit according to the detection voltage.
6. high voltage interlock circuit according to claim 5, which is characterized in that the bleeder circuit specifically includes: the 5th electricity
Resistance and the 6th resistance；
The first end of 5th resistance connects the positive output end of the constant-current source；
The second end of 5th resistance connects the first detection module, and connects the constant-current source through the 6th resistance
Negative output terminal.
7. high voltage interlock circuit according to claim 5, which is characterized in that
The voltage value of the detection voltage is no more than 5V.
8. high voltage interlock circuit according to any one of claims 1-4, which is characterized in that further include: diode and/or
Capacitor；
The anode of the diode connects the positive output end of the constant-current source, and the cathode of the diode connects the detection branch
Road；
The first end of the capacitor is connected between the high voltage interface and the 3rd resistor, the second end connection of the capacitor
The negative output terminal of the constant-current source.
9. a kind of fault detection method, which is characterized in that applied to the electricity of high-voltage interlocking described in claim 1-8 any one
Road；The method, comprising:
The voltage for obtaining the constant-current source positive output end, obtains sampled voltage；
Determine voltage range described in sampled voltage described in the allocation list being previously obtained；It include multiple voltages in the allocation list
The one-to-one relationship of the connection status in section and high voltage interface circuit, each voltage range are not overlapped；
According to the connection status in high voltage interface circuit corresponding to the voltage range determined, the event in high voltage interface circuit is judged
Barrier.
10. a kind of fault detection means, which is characterized in that applied to the electricity of high-voltage interlocking described in claim 1-8 any one
Road；Described device, comprising: data capture unit, range lookup unit and breakdown judge unit；
The data capture unit obtains sampled voltage for obtaining the voltage of the constant-current source positive output end；
The range lookup unit, for determining voltage range described in sampled voltage described in the allocation list being previously obtained；Institute
State the one-to-one relationship of the connection status including multiple voltage ranges and high voltage interface circuit in allocation list, each voltage
Section is not overlapped；
The breakdown judge unit, for the connection status in the high voltage interface circuit according to corresponding to the voltage range determined,
Judge the failure in high voltage interface circuit.
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