CN105929325B - Relay adhesion detection circuit and relay adhesion detection method - Google Patents
Relay adhesion detection circuit and relay adhesion detection method Download PDFInfo
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- CN105929325B CN105929325B CN201610417794.0A CN201610417794A CN105929325B CN 105929325 B CN105929325 B CN 105929325B CN 201610417794 A CN201610417794 A CN 201610417794A CN 105929325 B CN105929325 B CN 105929325B
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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
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
- G01R31/3272—Apparatus, systems or circuits therefor
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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
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
- G01R31/3275—Fault detection or status indication
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Abstract
The embodiment of the invention provides a relay adhesion detection circuit and a relay adhesion detection method. Relay adhesion detection circuitry including the power of establishing ties in order, with the anodal main positive relay that links to each other of power, load and with the first loop that the main negative relay that links to each other of power negative pole constitutes, the load is the parallel circuit that electric capacity and resistance constitute, still include with main positive relay or the parallelly connected current detection branch road of main negative relay, the current detection branch road includes diode, current source and the current sensor of establishing ties. The relay adhesion detection circuit of the embodiment of the invention improves the accuracy and the detection speed of relay adhesion detection.
Description
Technical field
The present invention relates to electronic technology field more particularly to a kind of relay adhesion detection circuits and relay adhesion to detect
Method.
Background technique
Electric car is the new energy industry that country vigorously advocates.As the automobile by electric energy operating, battery system (refers to
The power supply of electric car) be electric car core component.Electric automobile high-voltage major loop relay controls battery system
Electric discharge, the reliably working of the relay are directly related to the safety problem of electric car.Electric car is in relay adhesion state
Lower work will likely cause safety accident.If the adhesion detection to relay is reported by mistake, electric car will can not start.
Therefore, BMS (Battery Management System, battery management system) needs reliably to detect relay adhesion shape
State.
Fig. 1 is the structural schematic diagram of electric automobile high-voltage major loop.As shown in Figure 1, electric automobile high-voltage major loop includes
Concatenated power supply V, the positive relay K1 of the master being connected with power supply V anode, load L and the negative relay of master being connected with power supply V cathode
First circuit of K3 composition, wherein load L is the parallel circuit being made of capacitor C0 and resistance R0.In electric automobile high-voltage master
In circuit, power supply V is generally battery pack.As it can be seen that load L is a capacitive load.Loading L is the motor in electric car,
In, capacitor C0 is the capacitor of motor inverter.Herein, the voltage difference at the both ends of power supply V is known as PACK voltage, L will be loaded
The voltage difference at both ends is known as LINK voltage.The voltage at end is respectively PACK+ voltage and PACK- where the anode and cathode of power supply V
The voltage of voltage, the load both ends L is respectively LINK+ and LINK- voltage.Therefore, the both end voltage of main positive relay K1 claims respectively
Both end voltage for PACK+ voltage and LINK+ voltage, main negative relay K3 is respectively PACK- voltage and LINK- voltage.
Traditional relay adhesion detection (detects main positive relay and main negative relay using voltage detection method respectively
The voltage at both ends), and it is provided with very strong discharge loop, because the capacitor C0 of motor inverter is very big, if without very strong
Discharge loop, voltage decline will be very slow, and permanent magnet synchronous motor used in electric car have energy feedback energy
Power.
Since discharge loop will appear damage, and discharge loop meeting heat production in use, therefore considering capacitor
In the case where will not being contacted, discharge loop had better not be set.But in the case where being not provided with discharge loop, because of motor control
The presence of device capacitor C0 and road conditions difference electric power generation effect exist, and continuous power-on and power-off are released, electricity naturally without bleeder resistance
The factors such as machine feedback, when occurring when the capacitive load end LINK voltage of relay and the close situation of PACK voltage, PACK-
LINK voltage detection method will be considered that adhesion, but actually relay not adhesion occurs in relay, so that it is wrong to cause detection
Accidentally.Meanwhile in the case where being not provided with discharge loop, since voltage declines very slow, it is too long to will cause detection time, detection time
It is too long to mean detection not in time, very big security risk can be caused to electric car.
Summary of the invention
The purpose of the present invention is to provide a kind of relay adhesion detection circuit and relay adhesion detection method, improve after
The accuracy of electric appliance adhesion detection, and improve detection speed.
To achieve the above object, the invention proposes a kind of relay adhesion detection circuit, including power supply in sequential series,
The first of the positive relay of the master being connected with the positive pole, load and the negative relay composition of the master that is connected with the power cathode
Circuit, the load are the parallel circuit that capacitor and resistance form, and further include and the positive relay of the master or the negative relay of the master
The current detecting branch of device parallel connection, the current detecting branch include concatenated diode, current source and current sensor.
Further, above-mentioned relay adhesion detection circuit can also have the characteristics that the current detecting branch also wraps
It includes and the concatenated current-limiting resistance of the diode, current source and current sensor.
Further, above-mentioned relay adhesion detection circuit can also have the characteristics that the current detecting branch also wraps
It includes and the concatenated thermistor of the diode, current source and current sensor.
Further, above-mentioned relay adhesion detection circuit can also have the characteristics that the current detecting branch also wraps
It includes and the concatenated switch of the diode, current source and current sensor.
Further, above-mentioned relay adhesion detection circuit can also have the characteristics that, further include and the current detecting
The first voltage detection branch of branch circuit parallel connection, and/or, in both the positive relay of the master and the negative relay of the master not with institute
State the second voltage detection branch of the relay parallel connection of current detecting branch circuit parallel connection.
The relay adhesion detection circuit of the embodiment of the present invention, not only increase relay adhesion detection accuracy and can
By property, and detection speed is fast, testing cost is low, efficiency is high.
To achieve the above object, it is viscous that the invention proposes a kind of relays based on relay adhesion detection circuit above-mentioned
Even detection method, comprising:
Disconnect main positive relay and main negative relay；
Whether detection current sensor has signal；
Judge according to testing result the positive relay of the master and the negative relay of the master whether adhesion.
Further, the above method can also have the characteristics that, described to judge the positive relay of the master according to testing result
Or the negative relay of master whether adhesion, comprising:
In the case where testing result is that current sensor has signal, the state of the signal is monitored；
Determine the relay of adhesion occur according to the state of the signal monitored；
Wherein, determine that the relay for adhesion occur includes: according to the state of the signal monitored
Monitor the signal it is in stable condition in the case where, determine that adhesion occurs in the positive relay of the master；Or,
In the case where monitoring the state change of the signal, determine that adhesion occurs in the negative relay of the master.
Further, the above method can also have the characteristics that, described to judge the positive relay of the master according to testing result
Or the negative relay of master whether adhesion, comprising:
In the case where testing result is current sensor no signal, the positive relay of the master and the negative relay of the master are determined
Device does not occur adhesion.
The relay adhesion detection method of the embodiment of the present invention, detects electric automobile high-voltage master by way of current detecting
Relay in circuit whether adhesion, accuracy and reliability is high, and detection speed is fast.
To achieve the above object, it is viscous that the invention proposes a kind of relays based on relay adhesion detection circuit above-mentioned
Even detection method, comprising:
It disconnects main positive relay and keeps leading negative relay connection；
After postponing setting time or current sensor signal disappearance, the negative relay of the master is disconnected；
Detect the signal of current sensor；
The adhesion situation of the positive relay of the master and the negative relay of the master is determined according to testing result.
Further, the above method can also have the characteristics that, described to determine the positive relay of the master according to testing result
With the adhesion situation of the negative relay of the master, comprising:
In the case where testing result is current sensor no signal, the non-adhesion of the positive relay of the master is confirmed, or,
In the case where testing result is that current sensor signal delays to reach, the positive relay adhesion of the master is confirmed.
The relay adhesion detection method of the embodiment of the present invention, detects electric automobile high-voltage master by way of current detecting
Relay in circuit whether adhesion, accuracy and reliability is high, and detection speed is fast.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attached
Figure is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for this field
For those of ordinary skill, without any creative labor, it can also be obtained according to these attached drawings other attached
Figure.
Fig. 1 is the structural schematic diagram of electric automobile high-voltage major loop.
Fig. 2 is one of the structural schematic diagram of relay adhesion detection circuit in the embodiment of the present invention.
Fig. 3 is the second structural representation of relay adhesion detection circuit in the embodiment of the present invention.
Fig. 4 is the third structural representation of relay adhesion detection circuit in the embodiment of the present invention.
Fig. 5 is four of the structural schematic diagram of relay adhesion detection circuit in the embodiment of the present invention.
Fig. 6 is five of the structural schematic diagram of relay adhesion detection circuit in the embodiment of the present invention.
Fig. 7 is six of the structural schematic diagram of relay adhesion detection circuit in the embodiment of the present invention.
Fig. 8 is a kind of concrete structure schematic diagram of current detecting branch in Fig. 2.
Fig. 9 is one of the flow chart of relay adhesion detection method in the embodiment of the present invention.
Figure 10 is two of the flow chart of relay adhesion detection method in the embodiment of the present invention.
Specific embodiment
The principle and features of the present invention will be described below with reference to the accompanying drawings, and illustrated embodiment is served only for explaining the present invention,
It is not intended to limit the scope of the present invention.For those of ordinary skill in the art, in the premise not made the creative labor
Under, spiritual all embodiments obtained, belong to protection scope of the present invention according to the present invention.
It should be noted that although may be described in embodiments of the present invention using term first, second, third, etc.
XXX, but these XXX should not necessarily be limited by these terms.These terms are only used to for XXX being distinguished from each other out.For example, not departing from this hair
In the case where bright scope of embodiments, the first XXX can also be referred to as the 2nd XXX, and similarly, the 2nd XXX can also be referred to as
One XXX.
Fig. 2 is one of the structural schematic diagram of relay adhesion detection circuit in the embodiment of the present invention.As shown in Fig. 2, this reality
It applies in example, relay adhesion detection circuit includes electric automobile high-voltage major loop shown in FIG. 1, the electric automobile high-voltage major loop
The first circuit including concatenated power supply V, main positive relay K1, load L and main negative relay K3 composition, wherein load L serves as reasons
The parallel circuit of capacitor C0 and resistance R0 composition, relay adhesion detection circuit further include the electric current in parallel with main positive relay K1
Detection branch, the current detecting branch include concatenated diode D, current source I and current sensor S.
In other embodiments of the present invention, current detecting branch can also be in parallel with the negative relay K3 of master.
The working principle of the detection circuit of relay adhesion shown in Fig. 2 is: disconnected in the positive relay K1 of master and main negative relay K3
In the case where opening, if current sensor S does not have signal, illustrate do not have in the current detecting subcircuits where current sensor S
There is electric current, can be determined that main positive relay K1 and main negative relay K3 are to disconnect accordingly；If current sensor S has letter
Number, illustrate there is electric current in circuit, can be determined that the case where there are relay adhesions accordingly.Then further according to current sensor S's
Signal condition further judges it is that main positive relay K1 or main negative relay K3 adhesion situation occur.If current sensor
Signal be constantly in stable state (refer to signal magnitude, strong and weak constant), then can be determined that adhesion occurs in main positive relay K1
Situation, if variation occurs in the signal of current sensor S, (variation here refers to that electric current reduces, when electric current is provided by external capacitive
When, as the energy of capacitor is shifted to power source internal, capacitance voltage decline, electric current scaled down), then can be determined that it is main it is negative after
There is adhesion situation in electric appliance K3.
In Fig. 2, power supply V can be battery pack.
The diode D of current detecting branch, current source I and the series sequence of current sensor S three, which can be, in Fig. 2 appoints
Meaning.
The principle of current sensor is, the electric current in circuit where the output signal and current sensor of current sensor at than
Example variation.
When the positive relay K1 adhesion of master, current detecting branch is equivalent to short circuit, the electric current in current detecting branch be by
What current source I was provided, voltage PACK+ is equal to always LINK+, and the signal of current sensor S is stable at this time.When the negative relay of master
It when device K3 adhesion, is equivalent to and has been superimposed a power supply on capacitor C0, the energy in capacitor C0 passes through optocoupler and current detecting branch
Road direction power supply V transfer, necessarily causes the variation of capacitor C0 voltage, voltage change can embody LINK+ at this time, lead to voltage in this way
LINK+ variation, so that the signal of current sensor S be made to change.
Relay adhesion detection circuit shown in Fig. 2 has the following beneficial effects:
First is that detected by way of current detecting main positive relay K1 or main negative relay K3 whether adhesion, therefore keep away
The both end voltage PACK- of negative relay K3 is exempted from the both end voltage PACK+ and LINK+ close of the positive relay K1 of master or has led
There is the case where error detection when close with LINK-, to improve the accuracy and reliability of relay adhesion detection；
Second is that since response of the current sensor to electric current is very fast, to relay whether the detection speed of adhesion
Quickly；
Third is that circuit is simple, the device needed is seldom, to reduce the cost of relay adhesion detection；
Fourth is that the electric energy for the capacitor C0 for loading L can be recovered to power supply V (principle by the current source I in current detecting branch
Be: the voltage of current source I+capacitor C0 voltage > power supply V voltage is recovered to the electricity of capacitor C0 in power supply V, end-state
It is voltage+capacitor C0 voltage=power supply V voltage of current source I), it is recycled with electric energy and is let out instead of traditional bleeder resistance
The electric energy processing mode put or released naturally, energy loss is small, therefore efficiency is high.
Therefore the relay adhesion detection circuit of the embodiment of the present invention, not only increase relay adhesion detection
Accuracy and reliability, and detection speed is fast, testing cost is low, efficiency is high.
Fig. 3 is the second structural representation of relay adhesion detection circuit in the embodiment of the present invention.As shown in figure 3, comparing
Further include in current detecting branch in embodiment shown in Fig. 2, the present embodiment and diode D, current source I and current sense
The concatenated current-limiting resistance Rx of device S.Due to the first circuit of power supply V, main positive relay K1, load L and main negative relay K3 composition
It is a high tension loop, the voltage of power supply V is very big, if main positive relay K1 or main negative relay K3 the case where there are adhesions,
It just will appear electric current in current detecting branch, since the voltage of power supply V is very big, cause the electric current in current detecting branch also can be very
Greatly, this may result in the component damage in current detecting branch, can not work normally.Current-limiting resistance Rx can be by work electricity
Stream setting is in a certain range.
Due to being in series with current-limiting resistance Rx in the current detecting branch of relay adhesion detection circuit shown in Fig. 3,
There is higher reliability compared to relay adhesion detection circuit shown in Fig. 2.
Fig. 4 is the third structural representation of relay adhesion detection circuit in the embodiment of the present invention.As shown in figure 4, comparing
Further include in current detecting branch in embodiment shown in Fig. 2, the present embodiment and diode D, current source I and current sense
The concatenated thermistor PTC of device S (Positive Temperature Coefficient, the thermistor of positive temperature coefficient).
In abnormal cases, when the positive relay K1 of master is disconnected, LINK+ voltage is higher than PACK+ voltage and main negative relay K3 closure, electricity
Stream detection branch has certain charge effects to power supply V.Thermistor PTC can prevent the electric current in circuit excessive and damage circuit
In component, thus make circuit have higher reliability.
As it can be seen that due to being in series with thermistor in the current detecting branch of relay adhesion detection circuit shown in Fig. 4
PTC, therefore there is higher reliability compared to relay adhesion detection circuit shown in Fig. 2.
Fig. 5 is four of the structural schematic diagram of relay adhesion detection circuit in the embodiment of the present invention.As shown in figure 5, comparing
Further include in current detecting branch in embodiment shown in Fig. 2, the present embodiment and diode D, current source I and current sense
The concatenated switch K2 of device S.
The setting of switch K2 can judging PACK+ voltage and LINK+ voltage phase difference is smaller (leads positive relay at this time
Device K1 and/or main negative relay K3 may have the case where adhesion) after, then current detecting branch is powered on, with the main positive relay of judgement
Whether device K1 really disconnects.Meanwhile the setting of switch K2 makes power supply V, main positive relay K1, load L and main negative relay K3 string
Join the first circuit of composition while being closed (lead positive relay K1 and main negative relay K3) in normal work, it can be by electric current
Detection branch disconnects, to save energy.Therefore, compared to embodiment shown in Fig. 2, relay adhesion detection electricity shown in fig. 5
Road can save energy, thus save the cost.
In embodiments of the present invention, on the basis of current detecting branch shown in Fig. 2, current detecting branch may include limit
Leakage resistance Rx, thermistor PTC, any one or more among switch K2, there is electric current inspection in them in series
It surveys in branch.
Fig. 6 is five of the structural schematic diagram of relay adhesion detection circuit in the embodiment of the present invention.As shown in fig. 6, comparing
Further include in current detecting branch in embodiment shown in Fig. 2, the present embodiment and diode D, current source I and current sense
The concatenated switch K2 of device S, relay adhesion detection circuit further include the first voltage detection branch with current detecting branch circuit parallel connection.
The first voltage detection branch (refers to the relay in parallel with voltage detecting branch and current detecting branch for detecting relay
Device, in Fig. 6 based on positive relay K1) both ends voltage.
Referring to Fig. 6, which may include concatenated first resistor R1, second resistance R2, third electricity
Hinder R3 and the 4th resistance R4.Wherein, the binding site of second resistance R2 and 3rd resistor R3 are grounded BMS_GND.
The relay adhesion testing principle of circuit shown in Fig. 6 is: when first voltage detection branch detect PACK+ voltage with
When LINK+ voltage phase difference is smaller, current detecting branch is powered on by the switch K2 in closed path detection branch, to pass through electricity
Whether stream detection branch detection main positive relay K1 and main negative relay K3 really disconnect.
The relay adhesion detection process of circuit shown in Fig. 6 is:
It is true by first voltage detection branch first in the case where the positive relay K1 of master and main negative relay K3 are disconnected
Determine the voltage difference between PACK+ and LINK+, if the voltage phase difference between PACK+ and LINK+ it is smaller (refer to less than setting threshold value,
The threshold value can be set to the 5%-20% of total voltage), and have electric current in current detecting branch, then prove to lead positive relay K1 or
Main negative relay K3 adhesion；
If first voltage detection branch determines that the voltage difference between PACK+ and LINK+ differs larger (greater than the threshold of setting
Value, the threshold value can be set to the 5%-20% of total voltage), illustrate to lead positive relay K1 and the main negative all positive normal off of relay K3
It opens, adhesion situation does not all occur.
In a particular application, judge in order to ensure reliability, can be powered on repeatedly, lower electricity, observe PACK+ and LINK
+ voltage change situation, repeatedly confirm.
Distinguishing the principle that main positive relay K1 still leads negative relay K3 adhesion is:
It is electric current that main positive relay K1 adhesion, which is equivalent to short circuit entire current detecting branch, the electric current of current detecting branch,
What source I was provided, PACK+ is equal to always LINK+.
Main negative relay K3 adhesion is equivalent to has been superimposed a power supply on capacitor C0, and the energy in capacitor C0 passes through optocoupler
It is shifted with current detecting Zhi Luxiang power supply V, necessarily causes the variation of capacitor C0 voltage in this way, voltage change can embody at this time
LINK+.Voltage can be distinguished main positive relay K1 after changing by current loop and still lead negative relay K3 adhesion:
If K3 adhesion, the current loop of formation are as follows: the power supply V → capacitor C0 → current sensor S → pole current source I → bis-
Pipe D → power supply V；
If K1 adhesion, the current loop of formation are as follows: current source I → diode D → current sensor S → current source I.
Fig. 7 is six of the structural schematic diagram of relay adhesion detection circuit in the embodiment of the present invention.As shown in fig. 7, comparing
Relay adhesion detection circuit in embodiment shown in fig. 6, the present embodiment further includes in parallel with main negative relay K3 the
Two voltage detecting branches.The second voltage detection branch is used to detect the voltage at the main both ends negative relay K3.
Referring to Fig. 7, which may include concatenated 5th resistance R5, the 6th resistance R6, the 7th electricity
Hinder R7 and the 8th resistance R8.Wherein, the binding site of the 6th resistance R6 and the 7th resistance R7 is grounded BMS_GND.
The relay adhesion detection process of circuit shown in Fig. 7 is: first determining whether to lead positive relay K1 adhesion state, then sentence
Disconnected main negative relay K3 adhesion state, detailed process is as follows:
It first disconnects main positive relay K1 and keeps leading negative relay K3 connection, after postponing 300ms (millisecond) leakage current, or
After current sensor S blackout, main negative relay K3 is disconnected.If after disconnecting main negative relay K3, current sensor S signal
It disappears, then proves that capacitor is released, the main positive non-adhesion of relay K1, by the voltage difference of the two ends of the negative relay K3 of master (under i.e.
The second voltage that face will refer to is poor) the main negative relay K3 adhesion situation of judgement；
If current sensor S signal delay reaches after disconnecting main negative relay K3, illustrate still there is electric current in circuit,
Illustrate to lead positive relay K1 adhesion
Fig. 8 is a kind of concrete structure schematic diagram of current detecting branch in Fig. 2.In Fig. 8, current source I by DC-DC converter,
Capacitor Cd composition.
In Fig. 8, circuit in dotted line frame is the specific implementation circuit of current source I.
In Fig. 8, photo resistance Dg and triode T (in box) are the specific implementation circuits of current sensor.Opto is light
Electric coupler, referred to as optocoupler.
In Fig. 8, signal to BMS refers to that current sensor is exported to the signal of battery management system.BMS out
Ctrl is that battery management system is exported to the control signal of switch K2.
In Fig. 8, current source I includes DC-DC converter, and DC-DC converter is connect with low-tension supply, and DC-DC converter is simultaneously
Relay adhesion detection circuit and current signal reception device (referring to the T in Fig. 8) power supply.Current signal reception device believes electric current
Number battery management system BMS is passed to calculate and judge.
The invention also provides a kind of relay adhesion detection methods based on relay adhesion detection circuit above-mentioned.It should
Method can be applied to detection electric automobile high-voltage major loop relay whether adhesion.
Fig. 9 is one of the flow chart of relay adhesion detection method in the embodiment of the present invention.As shown in figure 9, the present embodiment
In, relay adhesion detection method may include steps of:
Step S901 disconnects main positive relay and main negative relay；
Whether step S902, detection current sensor have signal；
Step S903, judge according to testing result main positive relay and main negative relay whether adhesion.
In embodiments of the present invention, step S903 may include steps of: be that current sensor has letter in testing result
In the case where number, the state of the signal is monitored；Determine the relay of adhesion occur according to the state of the signal monitored.
Wherein, determine that the relay of adhesion occur may include: in the shape for monitoring the signal according to the state monitored
In the case that state is stablized, determine that adhesion occurs in main positive relay.
Wherein, determine that the relay of adhesion occur may include: in the shape for monitoring the signal according to the state monitored
In the case that state changes, determine that adhesion occurs in main negative relay.
In embodiments of the present invention, step S903 may include steps of: be current sensor without letter in testing result
In the case where number, determine that main positive relay and the negative relay of the master do not occur adhesion.
The relay adhesion detection method of the embodiment of the present invention, detects electric automobile high-voltage master by way of current detecting
Relay in circuit whether adhesion, accuracy and reliability is high, and detection speed is fast.
Figure 10 is two of the flow chart of relay adhesion detection method in the embodiment of the present invention.As shown in Figure 10, this implementation
In example, relay adhesion detection method be may include steps of:
Step S1001 disconnects main positive relay and keeps leading negative relay connection；
Step S1002 disconnects main negative relay after postponing setting time or current sensor signal disappearance；
Step S1003 detects the signal of current sensor；
Step S1004 determines the adhesion situation of main positive relay and main negative relay according to step S1003 testing result.
In embodiments of the present invention, step S1004 may include: the case where testing result is current sensor no signal
Under, the main positive non-adhesion of relay of confirmation.At this point, relay adhesion detection method may further include following steps: according to master
The voltage difference of the two ends of negative relay determine main negative relay whether adhesion.If the voltage difference of the two ends of main negative relay is smaller, say
The bright negative relay adhesion of master illustrates to lead the non-adhesion of negative relay if the voltage difference of the two ends of main negative relay is larger.
In embodiments of the present invention, step S1004 may include: to delay to reach in testing result for current sensor signal
In the case where, the main positive relay adhesion of confirmation.
The relay adhesion detection method of the embodiment of the present invention, detects electric automobile high-voltage master by way of current detecting
Relay in circuit whether adhesion, accuracy and reliability is high, and detection speed is fast.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of relay adhesion detection circuit, including power supply in sequential series, the positive relay of the master being connected with the positive pole
The first circuit that device, load and the negative relay of master being connected with the power cathode form, the load is capacitor and resistance group
At parallel circuit, which is characterized in that further include the current detecting in parallel with the positive relay of the master or the negative relay of the master
Branch, the current detecting branch include concatenated diode, current source and current sensor；
When with the positive relay of the master of the current detecting branch circuit parallel connection or the master negative relay adhesion, the electric current inspection
It surveys branch to be used to constitute short-circuit loop with the relay of adhesion, the current source in the current detecting branch is for being
The current detecting branch provides electric current, and the current sensor in the current detecting branch is for exporting stable letter
Number；
When not with the negative relay of the master of the current detecting branch circuit parallel connection or the master positive relay adhesion, the electric current
Detection branch is used to make the energy in the capacitor in the load by power source transition described in the current detecting Zhi Luxiang,
The current sensor in the current detecting branch is used to export the signal of variation.
2. relay adhesion detection circuit according to claim 1, which is characterized in that the current detecting branch further includes
With the concatenated current-limiting resistance of the diode, current source and current sensor.
3. relay adhesion detection circuit according to claim 1, which is characterized in that the current detecting branch further includes
With the concatenated thermistor of the diode, current source and current sensor.
4. relay adhesion detection circuit according to claim 1, which is characterized in that the current detecting branch further includes
With the concatenated switch of the diode, current source and current sensor.
5. relay adhesion detection circuit according to claim 4, which is characterized in that further include and the current detecting branch
The first voltage detection branch of road parallel connection, and/or, in both the positive relay of the master and the negative relay of the master not with it is described
The second voltage detection branch of the relay parallel connection of current detecting branch circuit parallel connection.
6. a kind of relay adhesion detection method based on relay adhesion detection circuit described in claim 1, feature exist
In, comprising:
Disconnect main positive relay and main negative relay；
Whether detection current sensor has signal；
Judge according to testing result the positive relay of the master and the negative relay of the master whether adhesion.
7. relay adhesion detection method according to claim 6, which is characterized in that described to judge institute according to testing result
State main positive relay or the negative relay of the master whether adhesion, comprising:
In the case where testing result is that current sensor has signal, the state of the signal is monitored；
Determine the relay of adhesion occur according to the state of the signal monitored；
Wherein, determine that the relay for adhesion occur includes: according to the state of the signal monitored
Monitor the signal it is in stable condition in the case where, determine that adhesion occurs in the positive relay of the master；Or,
In the case where monitoring the state change of the signal, determine that adhesion occurs in the negative relay of the master.
8. relay adhesion detection method according to claim 6, which is characterized in that described to judge institute according to testing result
State main positive relay or the negative relay of the master whether adhesion, comprising:
In the case where testing result is current sensor no signal, determine that the positive relay of the master and the negative relay of the master are equal
Do not occur adhesion.
9. a kind of relay adhesion detection method based on relay adhesion detection circuit described in claim 1, feature exist
In, comprising:
It disconnects main positive relay and keeps leading negative relay connection；
After postponing setting time or current sensor signal disappearance, the negative relay of the master is disconnected；
Detect the signal of current sensor；
The adhesion situation of the positive relay of the master and the negative relay of the master is determined according to testing result.
10. relay adhesion detection method according to claim 9, which is characterized in that described to determine according to testing result
The adhesion situation of the master positive relay and the negative relay of the master, comprising:
In the case where testing result is current sensor no signal, the non-adhesion of the positive relay of the master is confirmed；Or,
In the case where testing result is that current sensor signal delays to reach, the positive relay adhesion of the master is confirmed.
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