CN109239588A - Fault detection circuit and method - Google Patents
Fault detection circuit and method Download PDFInfo
- Publication number
- CN109239588A CN109239588A CN201710560751.2A CN201710560751A CN109239588A CN 109239588 A CN109239588 A CN 109239588A CN 201710560751 A CN201710560751 A CN 201710560751A CN 109239588 A CN109239588 A CN 109239588A
- Authority
- CN
- China
- Prior art keywords
- relay
- voltage
- battery
- sample circuit
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
Abstract
The embodiment of the invention provides a fault detection circuit and a fault detection method, which are applied to the field of circuits. In an embodiment of the present invention, a fault detection circuit includes: a battery; a relay having a first end connected to a first end of the battery; a second voltage sampling circuit, a first end of the second voltage sampling circuit being connected to a second end of the relay, a second end of the second voltage sampling circuit being connected to a second end of the battery; and the first end of the first voltage sampling circuit is connected with the first end of the battery, and the second end of the first voltage sampling circuit is connected with the second end of the battery. The technical scheme provided by the embodiment of the invention is used for detecting whether the relay has a fault or not and improving the detection accuracy.
Description
[technical field]
The present invention relates to field of circuit technology more particularly to a kind of fault detection circuit and methods.
[background technique]
Currently, high-pressure system is typically provided on electric car, and the output of high-pressure system mesohigh power and switching are logical
It is often to be realized by the switch and closure of battery management unit (Battery Manage System, BMS) control relay.?
Under normal circumstances, the normal use durability of the contact of relay is longer, still, different in some environmental changes and some bursts
In normal situation, such as: overtemperature and overcurrent, powered-off fault and with switching etc. is carried, these abnormal conditions often will lead in electric car
Relay the failures such as stick together.
Based on this, the pith that diagnosis is electric automobile high-voltage system safeguard protection, touching are carried out to the contact of relay
Point diagnostic techniques can also be applied to for a long time in the design of electric automobile high-voltage system.Currently, general by acquisition relay coil
Electric current, and judge whether relay breaks down for the electric current as detection signal.
In realizing process of the present invention, at least there are the following problems in the prior art for inventor's discovery:
Existing relay test method is realized using the electric current in relay coil as detection signal, still, after
Electric current in electric apparatus coil be only used for detection BMS whether relay is controlled, can not accurate characterization relay work
Make state, Detection accuracy is lower.
[summary of the invention]
In view of this, the embodiment of the invention provides a kind of fault detection circuit and methods, whether to detect relay
It breaks down, improves Detection accuracy.
On the one hand, the embodiment of the invention provides a kind of fault detection circuits, comprising:
Battery；
Relay, the first end of the relay are connect with the first end of the battery；
Second voltage sample circuit, the first end of the second voltage sample circuit and the second end of the relay connect
It connects, the second end of the second voltage sample circuit is connect with the second end of the battery；
The first end of first voltage sample circuit, the first voltage sample circuit is connect with the first end of the battery,
The second end of the first voltage sample circuit is connect with the second end of the battery.
The aspect and any possible implementation manners as described above, it is further provided a kind of implementation, first electricity
Pressing sample circuit includes: the first divider resistance, the first sampling resistor and the first analog-digital converter；
The first end of first divider resistance is connect with the first end of the battery, and the second of first divider resistance
End is connect with the first end of first sampling resistor；
The second end of first sampling resistor is connect with the second end of the battery；
The second end of first divider resistance, the first end of first sampling resistor with first analog-to-digital conversion
Device connection.
The aspect and any possible implementation manners as described above, it is further provided a kind of implementation, the relay
Second end be the relay outer contacts.
The aspect and any possible implementation manners as described above, it is further provided a kind of implementation, second electricity
Pressing sample circuit includes: the second divider resistance, the second sampling resistor and the second analog-digital converter；
The first end of second divider resistance is connect with the outer contacts of the relay, second divider resistance
Second end is connect with the first end of second sampling resistor；
The second end of second sampling resistor is connect with the second end of the battery；
The second end of second divider resistance, the first end of second sampling resistor with second analog-to-digital conversion
Device connection.
The aspect and any possible implementation manners as described above, it is further provided a kind of implementation, the relay
Number be at least one；
The number of the second voltage sample circuit is identical as the number of the relay.
A technical solution in above-mentioned technical proposal has the following beneficial effects:
In fault detection circuit provided by the embodiment of the present invention, battery, relay and second voltage sample circuit string
Connection, also, first voltage sample circuit is connected to the two sides of battery, is based on this, and it can be accurate by first voltage sample circuit
The voltage of battery is got, and second voltage sample circuit can also be accurately obtained the voltage on second voltage sample circuit
Value, that is to say, that, can be with total positive voltage of battery or always negative by first voltage sample circuit and second voltage sample circuit
Voltage as the reference voltage, is accurately obtained the voltage of relay.
On the other hand, the embodiment of the invention provides a kind of fault detection methods, comprising:
When relay powers on, the voltage of relay is obtained by fault detection circuit, the fault detection circuit includes
The fault detection circuit of any of the above-described implementation；
Obtain the enabled state of the relay；
According to the enabled state of the voltage of the relay and the relay, detect whether the relay occurs event
Barrier.
The aspect and any possible implementation manners as described above, it is further provided a kind of implementation, according to it is described after
The voltage of electric appliance and the enabled state, detect whether the relay breaks down, comprising:
The voltage of the relay is compared with fault threshold；The fault threshold include: Fisrt fault threshold value with
Second fault threshold, wherein the Fisrt fault threshold value is greater than second fault threshold；
According to the enabled state of relationship and the relay between the voltage of the relay and the fault threshold,
Detect whether the relay breaks down.
The aspect and any possible implementation manners as described above, it is further provided a kind of implementation, according to it is described after
Whether the enabled state of relationship and the relay between the voltage of electric appliance and the fault threshold, detect the relay
It breaks down, comprising:
State is not enabled on when the relay is in, and the voltage of the relay is less than second fault threshold
When, detect that the relay sticks together failure.
The aspect and any possible implementation manners as described above, it is further provided a kind of implementation, according to it is described after
Whether the enabled state of relationship and the relay between the voltage of electric appliance and the fault threshold, detect the relay
It breaks down, comprising:
When the relay is in enabled state, and detect that the voltage of the relay is greater than the Fisrt fault
When threshold value, detect that the relay generation can not be attracted failure.
The aspect and any possible implementation manners as described above, it is further provided a kind of implementation is examined by failure
The voltage of slowdown monitoring circuit acquisition relay, comprising:
By the first voltage sample circuit in the fault detection circuit, the voltage of the battery is obtained；
By the second voltage sample circuit in the fault detection circuit, the electricity of the second voltage sample circuit is obtained
Pressure；
The voltage of the battery and the difference in voltage of the second voltage sample circuit are obtained, using as the relay
Voltage.
A technical solution in above-mentioned technical proposal has the following beneficial effects:
In the embodiment of the present invention, when relay powers on, electricity is sampled by the first voltage in above-mentioned fault detection circuit
Road and second voltage sample circuit carry out voltage acquisition, and obtain collected difference in voltage and obtain the voltage of relay；Due to
First voltage sample circuit is connected to battery two sides, for acquiring the voltage of battery two sides, based on this relay got
Voltage is got as the reference voltage with the total positive voltage or total negative voltage of battery, and accuracy rate is higher；Also, in view of after
The enabled state of electric appliance is different, and locating range is different under normal circumstances for the voltage of relay, is based on this, and passes through the failure
Whether the voltage for the relay that detection circuit obtains and the enabled state of relay can break down progress more to relay
Accurate detection.Based on this, technical solution provided by the embodiment of the present invention is able to detect whether relay breaks down, and improves
Detection accuracy.
[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 creative efforts, it can also be obtained according to these attached drawings other attached drawings.
Fig. 1 is the first circuit diagram of fault detection circuit provided by the embodiment of the present invention；
Fig. 2 is the second circuit schematic diagram of fault detection circuit provided by the embodiment of the present invention；
Fig. 3 is the flow diagram of fault detection method provided by the embodiment of the present invention.
[specific embodiment]
For a better understanding of the technical solution of the present invention, being retouched in detail to the embodiment of the present invention with reference to the accompanying drawing
It states.
It will be appreciated that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Base
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts it is all its
Its embodiment, shall fall within the protection scope of the present invention.
The term used in embodiments of the present invention is only to be not intended to be limiting merely for for the purpose of describing particular embodiments
The present invention.In the embodiment of the present invention and the "an" of singular used in the attached claims, " described " and "the"
It is also intended to including most forms, unless the context clearly indicates other meaning.
It should be appreciated that term "and/or" used herein is only a kind of incidence relation for describing affiliated partner, indicate
There may be three kinds of relationships, for example, A and/or B, can indicate: individualism A, exist simultaneously A and B, individualism B these three
Situation.In addition, character "/" herein, typicallys represent the relationship that forward-backward correlation object is a kind of "or".
It will be appreciated that though may be adopted in embodiments of the present invention using term first, second, third, etc. to describe voltage
Sample circuit etc., but these voltage sampling circuits should not necessarily be limited by these terms.These terms are only used to voltage sampling circuit each other
It distinguishes.For example, first voltage sample circuit can also be referred to as second in the case where not departing from range of embodiment of the invention
Voltage sampling circuit, similarly, second voltage sample circuit can also be referred to as first voltage sample circuit.
Depending on context, word as used in this " if " can be construed to " ... when " or " when ...
When " or " in response to determination " or " in response to detection ".Similarly, depend on context, phrase " if it is determined that " or " if detection
(condition or event of statement) " can be construed to " when determining " or " in response to determination " or " when the detection (condition of statement
Or event) when " or " in response to detection (condition or event of statement) ".
For by the current sensing relay failure in relay coil, that there are Detection accuracies is lower in the prior art
The problem of, the embodiment of the invention provides following resolving ideas: design error failure detection circuit, by total positive voltage of battery or total
Negative voltage obtains the voltage of relay, and the normal voltage model according to relay under different enabled states as the reference voltage
It encloses to detect whether relay breaks down.
Under the guidance of the thinking, this programme embodiment provides following feasible embodiment.
The embodiment of the present invention provides a kind of fault detection circuit and a kind of fault detection method.
Specifically, referring to FIG. 1, it illustrates for the first circuit of fault detection circuit provided by the embodiment of the present invention
Figure, as shown in Figure 1, the fault detection circuit includes:
Battery 11；
The first end of relay 12, relay 12 is connect with the first end of battery 11；
The first end of second voltage sample circuit 13, second voltage sample circuit 13 is connect with the second end of relay 12,
The second end of second voltage sample circuit 13 is connect with the second end of battery 11；
The first end of first voltage sample circuit 14, first voltage sample circuit 14 is connect with the first end of battery 11, the
The second end of one voltage sampling circuit 14 is connect with the second end of battery 11.
In the embodiment of the present invention, first voltage sample circuit is set to the two sides of battery, and first voltage sample circuit is used for
Detect the voltage of battery.
Specifically, as shown in Figure 1, first voltage sample circuit 14 includes: the first divider resistance 141, the first sampling resistor
142 and first analog-digital converter (Analog-to-Digital Converter, ADC) 143.Wherein, the first divider resistance 141
First end connect with the first end of battery 11, the first end of the second end of the first divider resistance 141 and the first sampling resistor 142
Connection, the second end of the first sampling resistor 142 are connect with the second end of battery 11, the second end of the first divider resistance 141, first
The first end of sampling resistor 142 is connect with the first analog-digital converter 143.
During a concrete implementation, in first voltage sample circuit, the first end and battery of the first divider resistance
Anode connection, the cathode of the second end of the first sampling resistor and battery connects.At this point, the first end of battery be battery just
Pole, the second end of battery are the cathode of battery.
Voltage U based on the battery that first voltage sample circuit 14 as shown in Figure 1 is got1It can indicate are as follows:
Wherein, U143For the voltage of the first analog-digital converter 143, R141For the resistance value of the first divider resistance 141, R142It is
The resistance value of one sampling resistor 142.
During implementing fault detection circuit as shown in Figure 1, the second end of relay 12 is relay 12
Outer contacts.
In the embodiment of the present invention, second voltage sample circuit is used to acquire the voltage of the second voltage sample circuit.Specifically
, as shown in Figure 1, second voltage sample circuit 13 includes: the second divider resistance 131, the second sampling resistor 132 and the second modulus
Converter 133.Wherein, the first end of the second divider resistance 131 is connect with the second end (outer contacts) of relay 12, and second point
The second end of piezoresistance 131 is connect with the first end of the second sampling resistor 132, the second end and battery of the second sampling resistor 132
11 second end connection, the second end of the second divider resistance 131, the first end of the second sampling resistor 132 turn with the second modulus
Parallel operation 133 connects.
At this point, the electricity of the second voltage sample circuit got according to second voltage sample circuit 13 as shown in Figure 1
Press U2It can indicate are as follows:
Wherein, U133For the voltage of the second analog-digital converter 133, R131For the resistance value of the second divider resistance 131, R132It is
The resistance value of two sampling resistors 132.
It should be noted that the embodiment of the present invention is not particularly limited the connection relationship between relay and battery.Such as
Shown in Fig. 1, the first end of relay 12 can be connected with the anode of battery 11, alternatively, the first end of relay 12 can also be with
It is connected with the cathode of battery 11.
Specifically, the second end (outer contacts) of relay is even when the anode of the first end of relay and battery connects
The first end of second voltage sample circuit is connect, at this point, the cathode of the second end of second voltage sample circuit and battery connects.It is based on
This, the voltage of the relay obtained at this time by first voltage sample circuit and second voltage sample circuit is with total negative voltage work
It obtains to reference, accuracy rate is higher.
Alternatively, when the connection of the cathode of the first end of relay and battery, second end (outer contacts) connection of relay
The first end of second voltage sample circuit, at this point, the anode of the second end of second voltage sample circuit and battery connects.It is based on
This, the voltage of the relay obtained at this time by first voltage sample circuit and second voltage sample circuit is with total positive voltage work
It obtains to reference, accuracy rate is higher.
When being applied to electric car field, in fault detection circuit as shown in Figure 1, relay 12 second end with
It can be with the high-pressure system of connecting electric automobile between battery 11.At this point, second voltage sample circuit 13 shown in FIG. 1 and high pressure
System is in parallel, and the two voltage is equal, that is to say, that may be considered by the voltage that above-mentioned second voltage sample circuit 13 obtains
The voltage of high-pressure system.Also, therefore the sum of voltage and the voltage of high-pressure system of relay 12 obtain for the voltage of battery 11
The difference of the voltage value and the collected voltage value of second voltage sample circuit 13 that take first voltage sample circuit 14 to get, so that it may
To obtain the voltage of relay.The embodiment of the present invention is not particularly limited the specific structure of high-pressure system.
Also, the embodiment of the present invention is not particularly limited the number of relay to be detected, in specific implementation this programme
When, the number of relay is at least one, also, the number of second voltage sample circuit is identical as the number of relay.
At this point, referring to FIG. 2, it is the second circuit schematic diagram of fault detection circuit provided by the embodiment of the present invention.
For the ease of statement, the label of each device is respectively independent in the label and Fig. 1 of each device in Fig. 2, is independent of each other.
Fault detection circuit as shown in Figure 2 includes: battery 21, the first relay 22, the second relay 23, high-pressure system
24, the first relay voltage sample circuit 25, the second relay voltage sample circuit 26 and battery voltage sampling circuit 27.
As shown in Fig. 2, the first end of anode the first relay 22 of connection of battery 21, the second end of the first relay 22 connect
One end of high-pressure system 24 is connect, the other end of high-pressure system 24 connects the second end of the second relay 23, the second relay 23
First end is connect with the cathode of battery 21.At this point, the first relay 22 is connected to the positive HV+ of battery 21, the second relay 23
It is connected to the cathode HV- of battery 21.
As shown in Fig. 2, one end of battery voltage sampling circuit 27 is connected to the positive HV+ of battery 21, the other end is connected to
The cathode HV- of battery 21.Wherein, battery voltage sampling circuit 27 includes: divider resistance 271, sampling resistor 272 and the first modulus
Converter 273, also, the first end of divider resistance 271 is connected to the positive HV+ of battery 21, and the second end of divider resistance 271 connects
Connect the first end of sampling resistor 272, the cathode HV- of the second end connection battery 21 of sampling resistor 272, also, divider resistance 271
Second end, the first end of sampling resistor 272 connect with the first analog-digital converter 273.
It is understood that as shown in Fig. 2, battery voltage sampling circuit 27 is used to obtain the voltage of battery, at this point, as schemed
Battery voltage sampling unit 27 in fault detection circuit shown in 2 is equivalent in fault detection circuit as shown in Figure 1
One voltage sampling circuit 14.
As shown in Fig. 2, second end (the outside of the first end of the first relay voltage sample circuit 25 and the first relay 22
Contact) it connects, the second end of the first relay voltage sample circuit 25 is connect with the cathode HV- of battery 21.Wherein, the first relay
Device voltage sampling circuit 25 includes: divider resistance 251, sampling resistor 252 and the second analog-digital converter 253, also, divider resistance
251 first end is connected to the second end (outer contacts) of the first relay 22, the second end connection sampling electricity of divider resistance 251
The first end of resistance 252, the cathode HV- of the second end connection battery 21 of sampling resistor 252, also, the second of divider resistance 251
It holds, the first end of sampling resistor 252 is connect with the second analog-digital converter 253.
It is understood that as shown in Fig. 2, the collected voltage of the first relay sample circuit 25 is high-pressure system 24
The sum of the voltage of voltage and the second relay 23, by obtaining the collected voltage of battery voltage sampling circuit 27 and the first relay
The collected difference in voltage of device sample circuit 25, so that it may obtain the voltage of the first relay 22.
As shown in Fig. 2, second end (the outside of the first end of the second relay voltage sample circuit 26 and the second relay 23
Contact) it connects, the second end of the second relay voltage sample circuit 26 is connect with the positive HV+ of battery 21.Wherein, the second relay
Device voltage sampling circuit 26 includes: divider resistance 261, sampling resistor 262 and third analog-digital converter 263, also, divider resistance
261 first end is connected to the second end (outer contacts) of the second relay 23, the second end connection sampling electricity of divider resistance 261
The first end of resistance 262, the positive HV+ of the second end connection battery 21 of sampling resistor 262, also, the second of divider resistance 261
It holds, the first end of sampling resistor 262 is connect with third analog-digital converter 263.
It is understood that as shown in Fig. 2, the collected voltage of the second relay sample circuit 26 is high-pressure system 24
The sum of the voltage of voltage and the first relay 22, by obtaining the collected voltage of battery voltage sampling circuit 27 and the second relay
The collected difference in voltage of device sample circuit 26, so that it may obtain the voltage of the second relay 23.
In fault detection circuit provided by the embodiment of the present invention, battery, relay and second voltage sample circuit string
Connection, also, first voltage sample circuit is connected to the two sides of battery, is based on this, and it can be accurate by first voltage sample circuit
The voltage of battery is got, and second voltage sample circuit can also be accurately obtained the voltage on second voltage sample circuit
Value, that is to say, that, can be with total positive voltage of battery or always negative by first voltage sample circuit and second voltage sample circuit
Voltage as the reference voltage, is accurately obtained the voltage of relay.
Hereinafter, being based on above-mentioned fault detection circuit, it is provided for the embodiments of the invention fault detection method and is illustrated.
Specifically, referring to FIG. 3, it is the flow diagram of fault detection method provided by the embodiment of the present invention, such as
Shown in Fig. 3, method includes the following steps:
S301 obtains the voltage of relay by fault detection circuit when relay is powered on.
During concrete implementation, which is the fault detection circuit of any of the above-described kind of implementation.
S302 obtains the enabled state of relay.
It should be noted that the embodiment of the present invention is not particularly limited the execution sequence of S301 and S302.The two can be with
It is synchronous when relay powers on to execute, alternatively, can also be executed with preset order of order.
S303 detects whether relay breaks down according to the enabled state of the voltage of relay and relay.
In the embodiment of the present invention, execute S301 in by fault detection circuit acquisition relay voltage the step of side
Method may include: to obtain the voltage of battery, and pass through fault detection by the first voltage sample circuit in fault detection circuit
Second voltage sample circuit in circuit obtains the voltage of second voltage sample circuit, later, obtain battery voltage and this
The difference in voltage of two voltage sampling circuits, using the voltage as relay.
It should be noted that when obtaining the voltage of relay in the above described manner, if relay is connected with the cathode of battery
It connects, then the voltage of the second voltage sample circuit got by second voltage sample circuit is negative value, and therefore, it is necessary to obtain the
The absolute value of the voltage of two voltage sampling circuits, using the voltage as the second voltage sample circuit.When relay is connected to electricity
When the anode in pond, then it is not necessarily to the calculating for carrying out obtaining absolute value, can directly carry out subsequent processing.
During implementing above-mentioned implementation, voltage and acquisition of the embodiment of the present invention for acquisition battery
The execution sequence of the voltage of second voltage sample circuit is not particularly limited, and can be executed with preset precedence sequence, alternatively,
Also it may be performed simultaneously.
In the embodiment of the present invention, the working condition of relay may include: one be not enabled in state and enabled state
It is a.Also, the working principle based on relay, for relay under different working conditions, the voltage of relay can be in difference
In the range of.
Based on this, the embodiment of the present invention can carry out the voltage of relay and fault threshold when executing S303 step
It compares, and according to the enabled state of relationship and relay between the voltage and fault threshold of relay, detecting relay is
It is no to break down.
In the embodiment of the present invention, fault threshold be can include but is not limited to: Fisrt fault threshold value and the second fault threshold,
In, Fisrt fault threshold value is greater than the second fault threshold.When relay voltage be greater than Fisrt fault threshold value, then can determine relay
The contact of device is in an off state；When the voltage of relay is less than the second fault threshold, can determine at the contact of relay
In attracting state.
At this point it is possible to including but not limited to following two situation:
The first, when relay in be not enabled on state when, the contact of relay under normal circumstances should be in disconnected
Open state.Based on this, it is not enabled on state when relay is in, and detect the voltage of relay less than the second fault threshold
When, detect that relay sticks together failure.
Wherein, relay sticks together failure, that is to say, that in the moment that battery high pressure is connected, the contact of relay exists
Electric arc is pulled out before contact, contact is melted in high-temperature electric arcing, and makes contact can not normally open phenomenon.
Second, when relay is when being in enabled state, the contact of relay under normal circumstances should be in suction
Conjunction state.Based on this, when relay is in enabled state, and detect that the voltage of relay is greater than Fisrt fault threshold value
When, detect that relay generation can not be attracted failure.
Hereinafter, fault detection circuit as shown in connection with fig. 2 is illustrated.
On the one hand, as shown in Fig. 2, the first relay 22 is connect with the positive HV+ of battery 21.When needing to detect in Fig. 2
When whether the first relay 22 breaks down, when the first relay 22 powers on, it can be obtained by battery voltage sampling circuit 27
The voltage of battery 21 obtains the voltage and second relay 23 of high-pressure system 24 by the first relay voltage sample circuit 25
The sum of voltage is based on this, obtains the voltage and the collected difference in voltage of the first relay voltage sample circuit 25 of battery 11, just
The available voltage to the first relay 22.The voltage of the first relay 22 got at this time is with total negative voltage HV- work
It obtains to reference, accuracy rate is higher.
When detecting that the first relay 22 powers on, if the coil of the first relay 22 is in the working condition being not enabled on
When, then the switch contact of the first relay 22 should be in an off state under normal circumstances, that is to say, that the first relay 22
Interior outside voltage should be greater than Fisrt fault threshold value.Based on this, the voltage for the first relay 22 that will acquire is respectively with
One fault threshold and the second fault threshold are compared.
So, when the voltage of the first relay 22 is greater than Fisrt fault threshold value, it is determined that the first relay 22 is not attracted,
The coil of first relay 22 is in an off state, it is, detecting that the first relay 22 does not break down.
Alternatively, when the voltage of the first relay 22 is less than the second fault threshold, it is determined that the first relay 22 does not disconnect,
The coil of first relay 22 is in attracting state, it is, detecting that the first relay 22 sticks together failure.
When detecting that the first relay 22 powers on, if the coil of the first relay 22 is in the working condition enabled
When, then the switch contact of the first relay 22 should be in attracting state, that is to say, that the interior outside voltage of the first relay 22
It should be less than the second fault threshold.Based on this, the voltage for the first relay 22 that will acquire respectively with Fisrt fault threshold value and
Second fault threshold is compared.
So, when the voltage of the first relay 22 is greater than Fisrt fault threshold value, it is determined that the first relay 22 is not attracted,
The coil of first relay 22 is in an off state, it is, detecting that the generation of the first relay 22 can not be attracted failure.
Alternatively, when the voltage of the first relay 22 is less than the second fault threshold, it is determined that the first relay 22 is attracted, the
The coil of one relay 22 is in attracting state, it is, detecting that the first relay 22 does not break down.
On the other hand, as shown in Fig. 2, the second relay 23 is connect with the cathode of battery 21.When needing to detect in Fig. 2
When whether two relays 23 break down, when the second relay 23 powers on, electricity can be obtained by battery voltage sampling circuit 27
The voltage in pond 21, by 26 collection voltages value of the second relay voltage sample circuit, since collected voltage value is negative value, because
This, obtains the absolute value of the negative value using the sum of the voltage of voltage and the first relay 22 as high-pressure system 24；Based on this, obtain
Take the voltage of battery 11 and the difference of the absolute value, so that it may get the voltage of the second relay 23.Second got at this time
The voltage of relay 23 is obtained using total positive voltage HV+ as reference, and accuracy rate is higher.
When detecting that the second relay 23 powers on, if the coil of the second relay 23 is in the working condition being not enabled on
When, then the switch contact of the second relay 23 should be in an off state under normal circumstances, that is to say, that the second relay 23
Interior outside voltage should be greater than Fisrt fault threshold value.Based on this, the voltage for the second relay 23 that will acquire is respectively with
One fault threshold and the second fault threshold are compared.
So, when the voltage of the second relay 23 is greater than Fisrt fault threshold value, it is determined that the second relay 23 is not attracted,
The coil of second relay 23 is in an off state, it is, detecting that the second relay 23 does not break down.
Alternatively, when the voltage of the second relay 23 is less than the second fault threshold, it is determined that the second relay 23 does not disconnect,
The coil of second relay 23 is in attracting state, it is, detecting that the second relay 23 sticks together failure.
When detecting that the second relay 23 powers on, if the coil of the second relay 23 is in the working condition enabled
When, then the switch contact of the second relay 23 should be in attracting state, that is to say, that the interior outside voltage of the second relay 23
It should be less than the second fault threshold.Based on this, the voltage for the second relay 23 that will acquire respectively with Fisrt fault threshold value and
Second fault threshold is compared.
So, when the voltage of the second relay 23 is greater than Fisrt fault threshold value, it is determined that the second relay 23 is not attracted,
The coil of second relay 23 is in an off state, it is, detecting that the generation of the second relay 23 can not be attracted failure.
Alternatively, when the voltage of the second relay 23 is less than the second fault threshold, it is determined that the second relay 23 is attracted, the
The coil of two relays 23 is in attracting state, it is, detecting that the second relay 23 does not break down.
The technical solution of the embodiment of the present invention has the advantages that
In the embodiment of the present invention, when relay powers on, electricity is sampled by the first voltage in above-mentioned fault detection circuit
Road and second voltage sample circuit carry out voltage acquisition, and obtain collected difference in voltage and obtain the voltage of relay；Due to
First voltage sample circuit is connected to battery two sides, for acquiring the voltage of battery two sides, based on this relay got
Voltage is got as the reference voltage with the total positive voltage or total negative voltage of battery, and accuracy rate is higher；Also, in view of after
The enabled state of electric appliance is different, and locating range is different under normal circumstances for the voltage of relay, is based on this, and passes through the failure
Whether the voltage for the relay that detection circuit obtains and the enabled state of relay can break down progress more to relay
Accurate detection.Based on this, technical solution provided by the embodiment of the present invention is able to detect whether relay breaks down, and improves
Detection accuracy.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent substitution, improvement and etc. done be should be included within the scope of the present invention.
Claims (10)
1. a kind of fault detection circuit, which is characterized in that the circuit includes:
Battery；
Relay, the first end of the relay are connect with the first end of the battery；
The first end of second voltage sample circuit, the second voltage sample circuit is connect with the second end of the relay, institute
The second end for stating second voltage sample circuit is connect with the second end of the battery；
The first end of first voltage sample circuit, the first voltage sample circuit is connect with the first end of the battery, described
The second end of first voltage sample circuit is connect with the second end of the battery.
2. circuit according to claim 1, which is characterized in that the first voltage sample circuit includes: the first partial pressure electricity
Resistance, the first sampling resistor and the first analog-digital converter；
The first end of first divider resistance is connect with the first end of the battery, the second end of first divider resistance with
The first end of first sampling resistor connects；
The second end of first sampling resistor is connect with the second end of the battery；
The second end of first divider resistance, the first end of first sampling resistor connect with first analog-digital converter
It connects.
3. circuit according to claim 1, which is characterized in that the second end of the relay is the outside of the relay
Contact.
4. circuit according to claim 3, which is characterized in that the second voltage sample circuit includes: the second partial pressure electricity
Resistance, the second sampling resistor and the second analog-digital converter；
The first end of second divider resistance is connect with the outer contacts of the relay, and the second of second divider resistance
End is connect with the first end of second sampling resistor；
The second end of second sampling resistor is connect with the second end of the battery；
The second end of second divider resistance, the first end of second sampling resistor connect with second analog-digital converter
It connects.
5. circuit according to claim 1, which is characterized in that the number of the relay is at least one；
The number of the second voltage sample circuit is identical as the number of the relay.
6. a kind of fault detection method, which is characterized in that the described method includes:
When relay powers on, the voltage of relay is obtained by fault detection circuit, the fault detection circuit includes right
It is required that any fault detection circuit in 1 to 5；
Obtain the enabled state of the relay；
According to the enabled state of the voltage of the relay and the relay, detect whether the relay breaks down.
7. according to the method described in claim 6, it is characterized in that, according to the voltage of the relay and the enabled state,
Detect whether the relay breaks down, comprising:
The voltage of the relay is compared with fault threshold；The fault threshold includes: Fisrt fault threshold value and second
Fault threshold, wherein the Fisrt fault threshold value is greater than second fault threshold；
According to the enabled state of relationship and the relay between the voltage of the relay and the fault threshold, detection
Whether the relay breaks down.
8. the method according to the description of claim 7 is characterized in that according to the voltage of the relay and the fault threshold it
Between relationship and the relay enabled state, detect whether the relay breaks down, comprising:
When the relay is in the state that is not enabled on, and the voltage of the relay is less than second fault threshold, inspection
The relay is measured to stick together failure.
9. the method according to the description of claim 7 is characterized in that according to the voltage of the relay and the fault threshold it
Between relationship and the relay enabled state, detect whether the relay breaks down, comprising:
When the relay is in enabled state, and the voltage of the relay is greater than the Fisrt fault threshold value, inspection
Failure can not be attracted by measuring the relay generation.
10. according to the method described in claim 6, it is characterized in that, by fault detection circuit obtain relay voltage, packet
It includes:
By the first voltage sample circuit in the fault detection circuit, the voltage of the battery is obtained；
By the second voltage sample circuit in the fault detection circuit, the voltage of the second voltage sample circuit is obtained；
The voltage of the battery and the difference in voltage of the second voltage sample circuit are obtained, using the electricity as the relay
Pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710560751.2A CN109239588A (en) | 2017-07-11 | 2017-07-11 | Fault detection circuit and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710560751.2A CN109239588A (en) | 2017-07-11 | 2017-07-11 | Fault detection circuit and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109239588A true CN109239588A (en) | 2019-01-18 |
Family
ID=65083872
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710560751.2A Pending CN109239588A (en) | 2017-07-11 | 2017-07-11 | Fault detection circuit and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109239588A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111551845A (en) * | 2020-05-27 | 2020-08-18 | 中航锂电（洛阳）有限公司 | Switch detection circuit and detection method |
| CN112213631A (en) * | 2020-09-03 | 2021-01-12 | 珠海格力电器股份有限公司 | Relay state detection device and method and automobile |
| CN113302505A (en) * | 2020-07-31 | 2021-08-24 | 华为技术有限公司 | Switch state detection circuit, method and device |
| WO2022021964A1 (en) * | 2020-07-31 | 2022-02-03 | 华为数字能源技术有限公司 | Switch state testing circuit, method and apparatus |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102269790A (en) * | 2011-04-22 | 2011-12-07 | 上海恒动汽车电池有限公司 | Fault diagnosis circuit for high-voltage relay of power storage battery |
| CN204679600U (en) * | 2015-06-19 | 2015-09-30 | 安徽江淮汽车股份有限公司 | A kind of power brick high-voltage relay bonding fault diagnosis system |
| CN106707152A (en) * | 2016-12-20 | 2017-05-24 | 东莞钜威动力技术有限公司 | Adhesion detection circuit and adhesion detection method for electric automobile power relay |
| CN106772012A (en) * | 2016-12-28 | 2017-05-31 | 惠州市蓝微新源技术有限公司 | A kind of relay fault diagnosis circuit and method |
-
2017
- 2017-07-11 CN CN201710560751.2A patent/CN109239588A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102269790A (en) * | 2011-04-22 | 2011-12-07 | 上海恒动汽车电池有限公司 | Fault diagnosis circuit for high-voltage relay of power storage battery |
| CN204679600U (en) * | 2015-06-19 | 2015-09-30 | 安徽江淮汽车股份有限公司 | A kind of power brick high-voltage relay bonding fault diagnosis system |
| CN106707152A (en) * | 2016-12-20 | 2017-05-24 | 东莞钜威动力技术有限公司 | Adhesion detection circuit and adhesion detection method for electric automobile power relay |
| CN106772012A (en) * | 2016-12-28 | 2017-05-31 | 惠州市蓝微新源技术有限公司 | A kind of relay fault diagnosis circuit and method |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111551845A (en) * | 2020-05-27 | 2020-08-18 | 中航锂电（洛阳）有限公司 | Switch detection circuit and detection method |
| CN113302505A (en) * | 2020-07-31 | 2021-08-24 | 华为技术有限公司 | Switch state detection circuit, method and device |
| WO2022021964A1 (en) * | 2020-07-31 | 2022-02-03 | 华为数字能源技术有限公司 | Switch state testing circuit, method and apparatus |
| CN113302505B (en) * | 2020-07-31 | 2023-02-24 | 华为数字能源技术有限公司 | Vehicle-mounted charger, method and electric vehicle |
| CN112213631A (en) * | 2020-09-03 | 2021-01-12 | 珠海格力电器股份有限公司 | Relay state detection device and method and automobile |
| CN112213631B (en) * | 2020-09-03 | 2021-11-09 | 珠海格力电器股份有限公司 | Relay state detection device and method and automobile |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109239588A (en) | Fault detection circuit and method | |
| US9383415B2 (en) | Battery system having battery contactors and a diagnostic device for monitoring the functional state of the contactors and associated diagnostic method | |
| CN105988082B (en) | The relay status detection method and device of electric automobile high-voltage system | |
| CN110174625B (en) | Insulation monitoring system and monitoring algorithm for resistance of power battery pack | |
| CN109100618A (en) | High-tension battery Insulation Inspection System and method | |
| CN108802605A (en) | Relay adhesion detection method and system | |
| CN111308396B (en) | Insufficient solder joint detection circuit and method | |
| CN109521359A (en) | A kind of negative relay status detection circuit of power battery master and method | |
| JP2012122856A (en) | Battery pack device | |
| TWI676806B (en) | Open connection detection apparatus, circuits, methods, and systems for detecting an open connection on at least one of a plurality of input from a multi-cell battery pack | |
| CN104215901A (en) | High voltage circuit breaker arc contact fault diagnosis method | |
| CN106772082B (en) | Voltage acquisition line disconnection detection method for single battery | |
| CN105425155B (en) | A kind of high-tension battery group total voltage and insulating resistor detecting circuit and detection method | |
| CN113092922B (en) | Independent diagnosis device and method for high-voltage contactor of power battery system | |
| CN109061307A (en) | The method for diagnosing faults of insulating resistor detecting circuit | |
| CN106324507A (en) | Performance testing method and system of power battery | |
| CN107490767A (en) | Insulation detecting method, system and the vehicle of battery bag | |
| CN203799008U (en) | Pillar type electronic current transformer primary vibration test data acquisition device | |
| CN111766461A (en) | Contactor diagnosis/total pressure acquisition circuit of vehicle power battery | |
| CN106450529B (en) | A kind of battery balanced control circuit and detection method | |
| CN107782950A (en) | High voltage detection circuit and method, detector, battery system, vehicle and computer readable storage medium | |
| CN110736922B (en) | Device and method for measuring switch-on pre-breakdown time | |
| CN105676112B (en) | A kind of universal 12-phase rectification bridge fault detection method | |
| JP2010239837A (en) | Line-to-ground fault detector, charger for electric vehicles, and method of detecting line-to-ground fault | |
| CN109298033B (en) | Electrochemical gas sensor and diagnosis method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190118 |