CN209264918U - High-voltage relay state on_line monitoring device - Google Patents
High-voltage relay state on_line monitoring device Download PDFInfo
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- CN209264918U CN209264918U CN201821753756.3U CN201821753756U CN209264918U CN 209264918 U CN209264918 U CN 209264918U CN 201821753756 U CN201821753756 U CN 201821753756U CN 209264918 U CN209264918 U CN 209264918U
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Abstract
A kind of high-voltage relay state on_line monitoring device includes: low-pressure control module, is made of linear stabilized power supply and microcontroller；Signal isolation module is made of isolating switch power, serial communication isolator and optocoupler gating module；High pressure monitoring modular is made of signal conversion module and signal sampling module.Linear stabilized power supply provides electric energy to the low-pressure control module and signal isolation module.Micro controller module determines high-voltage relay current state.Isolating switch power provides electric energy to the high pressure monitoring modular.Serial communication isolator establishes serial communication link between microcontroller and high pressure monitoring modular.Optocoupler gating module is that high pressure monitoring modular selects detection branch corresponding to current high-voltage relay to be measured.The state of high-voltage relay contact is converted into voltage signal by the detection branch currently gated by signal conversion module.Signal sampling module acquires each voltage signal that signal conversion module provides.
Description
Technical field
The utility model belongs to electric vehicle engineering field, in particular to the high-voltage relay shape in power battery pack circuit
State on-Line Monitor Device.
Background technique
Its power source of the high-tension system of electric car as electric car, the usually spy with high voltage, high current
Point, so that the charge and discharge process transformation of electric car generally requires high-voltage relay and switches over to high-power circuit.If high
Potential relay occurs closure or disconnects failure, and takes this measure of being effectively treated not in time, gently then leads to high-voltage electricity system
System cannot achieve normally with electric control, heavy then there may be serious safety accidents.
For example, it is easy to happen the problem of contact impedance between contact becomes larger by switching the high-voltage relay used for a long time,
In the case where the larger electrical load of high pressure electrical circuit long-term existence, the failure conditions surprisingly disconnected are easy to happen, this is needed in height
Under the conditions of piezoelectric system powered operation, system can monitor whether high-voltage relay occurs early warning event of opening a way in real time.In addition, long
There is also the Problem of Failure of contact adhesion for the high-voltage relay that phase uses, this is needed can be solely in high-tension system power up
Contacts status that is vertical, detecting each high-voltage relay in real time, damages high pressure electrical circuit component with anti-misoperation.
Therefore, the execution state of high-voltage relay is carried out effectively and is monitored in real time, this is for guaranteeing electric car
Secure and reliable operation has a very important significance.
High-voltage relay condition monitoring is mainly to judge holding for high-voltage relay by checking the contacts status of relay
Whether row situation meets the requirement of system control strategy, should avoid in the case where high-voltage relay is opened to high pressure electrical circuit
Apply electrical load, also to prevent from disconnecting high-voltage relay in the case where high tension loop has larger electrical load.
Currently, the electric relay detection device of electric automobile high-voltage distribution system still remains many problems, for example,
(1) the existing detection method of is unable to monitor high-voltage relay state in high-pressure system operational process, can only be in height
It is detected before pressure system electrification or after lower electricity, this results in traditional monitoring device can not in the process of running in time
The failure warning that relay is surprisingly opened a way is provided；
(2) the problems such as delay of detection process existing for the existing detection method of length, real-time is poor, and detection accuracy is unstable；
(3) it when the existing detection method of detects the relay of different branch in distribution system, is easy by difference
The influence of branch coupling, the problem of leading to error detection；
(4) high cost existing for the existing detection device of, the problems such as circuit structure is complicated.
If analyzing existing detection method, it is found that the relay test of electric automobile high-voltage distribution system at present
Device there are the problem of the reason of be concentrated mainly on integrated circuit structure and detection method etc..
From the point of view of the design of integrated circuit structure, existing high-voltage relay detection device is broadly divided into analogue type and numeric type
Two kinds.The former does not include controller, only includes analog sampling circuit, by the voltage change between high-voltage relay contact with analog quantity
Form BMS unit is directly passed to by sampled signal harness, as shown in Figure 1.This method realizes simple and low cost, but
It is that the anti-interference of detection circuit is poor, is highly susceptible to do in power battery distribution system electromagnetic interference environment harsh in this way
It disturbs, it is very low so as to cause detection accuracy.The latter is mainly master-slave mode dual controller structure, and master controller is responsible for determining high-voltage relay
The state of device, from controller be responsible for acquiring high-voltage relay contact between voltage, communicated using CAN bus between master-slave controller, such as
Shown in Fig. 2.This method detection accuracy is high, and strong interference immunity, still, detection process real-time are poor, and circuit structure is complicated, cost
It is high.
From the point of view of detection method realization, existing high-voltage relay condition detection method is primarily directed to high pressure electrical circuit section
Sampled voltage is compared between point, thus control relay contacts status.By taking Fig. 3 as an example, when high-tension system is in electric discharge mould
When formula, the on off operating mode of the positive relay contact of major loop, the i.e. difference of U1 and U2 are monitored by comparing sampled voltage U1 and U2
When greater than a certain threshold value, which is open-circuit condition；When the difference of U1 and U2 is less than a certain threshold value, relay touching
Point is short-circuit condition.This method is simple and is easily achieved, and but has the disadvantage in that
(1) due to the bus capacitor of motor load it is larger, it is electric under motor load both ends generally in lower electric process
Speed is slow, so that this method detection process is there are biggish delay, real-time is poor, seriously restricts distribution system
Working efficiency；
(2) due to the presence of pre-charge resistance, precharge branch is switched in the major loop course of work, sampled voltage U1,
U2 and U3 variation is unobvious, and can not accurately detect the contacts status of precharge branch relay, causes distribution system can not
It works normally.
Utility model content
The purpose of the utility model is to provide a kind of devices of power battery high-voltage relay state on_line monitoring, have
The function of on-line real time monitoring multichannel high-voltage relay state, can efficiently solve detection low-response present in the prior art,
Poor reliability, and the coupled interference and the influence of distribution system operating mode that are limited to different relay test branches etc. are asked
Topic.In the utility model field, distribution system here is referred to as battery pack energy-storage system.Battery pack energy-storage system is
Refer to the general designation of the attachmentes such as battery pack, high-voltage relay, BMS element circuit plate, high-tension connector, radiating module.Battery pack energy storage
System output is connected to the load equipments such as Vehicular charger, DC/DC conversion equipment, electric machine controller, compressor of air conditioner.
One of the utility model embodiment, a kind of high-voltage relay state on_line monitoring device, for power battery pack electricity
The on-line monitoring of high-voltage relay in road, the detection device include:
Low-pressure control module, the module are made of linear stabilized power supply and microcontroller；
Signal isolation module, the module are made of isolating switch power, serial communication isolator and optocoupler gating module；
High pressure monitoring modular, the module are made of signal conversion module and signal sampling module, wherein
Microcontroller, serial communication isolator, signal sampling module and signal conversion module are sequentially connected, and optocoupler gates mould
Block directly concatenates microcontroller and signal conversion module,
Linear stabilized power supply is used to provide electric energy to the low-pressure control module and signal isolation module,
Micro controller module for determining high-voltage relay current state,
Isolating switch power is used to provide electric energy to the high pressure monitoring modular；
Serial communication isolator is for establishing serial communication link between microcontroller and high pressure monitoring modular；
Optocoupler gating module is used to select detection branch corresponding to current high-voltage relay to be measured for high pressure monitoring modular；
Signal conversion module is used to be converted into the state of high-voltage relay contact by the detection branch currently gated
Voltage signal；
Signal sampling module is used to acquire each voltage signal of signal conversion module offer, and is converted into digital quantity, leads to
It crosses serial communication isolator and passes to micro controller module.
The utility model provides a kind of device of power battery high-voltage relay state on_line monitoring, the monitoring device
Circuit include low-pressure control module, signal isolation module, high pressure monitoring modular.Wherein, high pressure detection module is for detecting height
The on off operating mode of potential relay contact；Low-pressure control module be responsible for receive BMS unit control instruction, and report all high pressures after
The real-time status of electric appliance；Signal isolation module be responsible for high-voltage detecting circuit power supply, and be responsible between high-low circuit communication with
Control signal is isolated.The utility model can be applied to the battery breaking units and block terminal of electric car, compared to existing
The high-voltage relay state monitoring apparatus of some power battery packs, the utility model have the advantage that
(1) the utility model can on-line real time monitoring battery pack high-voltage relay state, solve existing method in height
The problem of being unable to monitor in potential relay system operation；
(2) the utility model, which is able to achieve, fast and accurately detects, and solves the delay of detection process existing for existing method
The problems such as length, real-time is poor, and detection accuracy is unstable；
(3) the utility model is able to achieve multicircuit relay while monitoring on-line, solve difference existing for existing method after
The problem of coupling between electrical testing branch and influence detection accuracy；
(4) the utility model have the characteristics that it is inexpensive, simple easily realize, solve high cost existing for existing method,
The problems such as circuit structure is complicated.
Detailed description of the invention
The following detailed description is read with reference to the accompanying drawings, the utility model illustrative embodiments above-mentioned and other
Objects, features and advantages will become prone to understand.In the accompanying drawings, it is practical new that this is shown by way of example rather than limitation
Several embodiments of type, in which:
Fig. 1 is used to detect the analogue type detection unit schematic diagram of high-voltage relay in the prior art.
Fig. 2 is used to detect the numeric type detection unit schematic diagram of high-voltage relay in the prior art.
Fig. 3 voltage sample detection method schematic diagram in the prior art.
The structural schematic diagram of power battery high-voltage relay state on_line monitoring device in Fig. 4 the utility model embodiment.
The schematic diagram of power battery high-voltage relay state on_line monitoring device in Fig. 5 the utility model embodiment.
The circuit diagram that major loop anode relay status is monitored on-line in Fig. 6 the utility model embodiment.
The circuit diagram that major loop negative terminal relay status is monitored on-line in Fig. 7 the utility model embodiment.
The circuit diagram that precharge branch relay status is monitored on-line in Fig. 8 the utility model embodiment.
Specific embodiment
According to one or more embodiment, as shown in Figure 4.The utility model mainly includes low-pressure control module, signal
Isolation module, high pressure monitoring modular.Wherein, low-pressure control module is made of linear stabilized power supply and micro controller module；Letter
Number isolation module is made of isolating switch power, serial communication isolator and optocoupler gating module；High pressure monitoring modular is
It is made of signal conversion module and signal sampling module.
The linear stabilized power supply is used to provide electric energy to the low-pressure control module and signal isolation module；
The micro controller module is reported to top level control unit for determining high-voltage relay current state；
The isolating switch power is used to provide electric energy to the high pressure monitoring modular；
The serial communication isolator is for establishing serial communication link between micro controller module and high pressure monitoring modular；
The optocoupler gating module is used to select detection branch corresponding to current relay for high pressure monitoring modular；
The signal conversion module is used for the detection branch by currently having gated and turns the state of high-voltage relay contact
Change voltage signal into；
The signal sampling module is used to acquire each voltage signal of signal conversion module offer, and is converted into number
Amount, passes to micro controller module by serial communication isolator.
According to one or more embodiment, as shown in Figures 4 and 5.Power battery high-voltage relay state on_line monitoring dress
It sets, includes low-pressure control module, signal isolation module and high pressure monitoring modular.
The low-pressure control module is made of linear stabilized power supply and microcontroller；Wherein, linear stabilized power supply be used for
The low-pressure control module and signal isolation module provide electric energy；Micro controller module is for determining the current shape of high-voltage relay
State, and it is reported to top level control unit.
The signal isolation module is made of isolating switch power, serial communication isolator and optocoupler gating module；Its
In, isolating switch power is used to provide electric energy to the high pressure monitoring modular；Serial communication isolator is used to be microcontroller
Serial communication link is established between module and high pressure monitoring modular；Optocoupler gating module be used for for high pressure monitoring modular selection currently after
Detection branch corresponding to electric appliance.
The high pressure monitoring modular is made of signal conversion module and signal sampling module；Wherein, signal conversion module is used
The state of high-voltage relay contact is converted into voltage signal in the detection branch by currently having gated；Signal sampling module is used
In each voltage signal that acquisition signal conversion module provides, and it is converted into digital quantity, is passed to by serial communication isolator
Micro controller module.
Major loop detection node 1 to 5 first passes through high-voltage diode array and is connected to optocoupler gating module, then by optocoupler
Gating module output end is connected to fixed resistance bleeder circuit；The bias supply of the fixed resistance bleeder circuit and by being isolated
Switching Power Supply generates；The divider node of the fixed resistance bleeder circuit is connected to the input terminal of digital analog converter；Optocoupler choosing
Logical module input is connected to the IO output end of microcontroller；Microcontroller serial communication interface and digital analog converter serial communication
Interface is connected to the input/output port of serial communication isolator.
According to one or more embodiment, as shown in figure 5, it gives the power battery high-voltage relay of the utility model
The schematic diagram of device state on_line monitoring device.The inspection that the monitoring device is formed by 5 detection nodes of optocoupler gating module
Survey branch access power battery pack circuit loop, the power battery pack circuit include power battery pack, major loop anode relay,
Major loop negative terminal relay, pre-charge resistance and pre-charge-relay.
It is in parallel with major loop anode relay after pre-charge resistance is connected with pre-charge-relay.Major loop anode relay
The anode of one end connection power battery pack of device, the other end connect battery pack energy-storage system and export bus anode BUS+.Major loop
The cathode of one end connection power battery pack of negative terminal relay, the other end connect battery pack energy-storage system and export bus negative terminal
BUS-.First detection node is connecting pre-charge-relay and major loop anode relay, battery pack energy-storage system output bus just
Hold the tie point of BUS+.The tie point of second detection node connection pre-charge resistance and pre-charge-relay.Third detection node
Connect the anode of major loop anode relay and power battery pack, the tie point of pre-charge resistance.4th detection node connection master
The tie point of circuit negative terminal relay and the cathode of power battery pack.5th detection node connects major loop negative terminal relay and electricity
The tie point of pond packet energy-storage system output bus negative terminal BUS-.Optocoupler gating module is controlled by microcontroller, gating is corresponding
Detection branch generates corresponding voltage in high pressure monitoring modular, and the voltage value is passed to microcontroller.Then, micro-control
Device processed judges the corresponding high-voltage relay state of the voltage value for according to presetting high-voltage relay different conditions lower threshold value.
Wherein, battery pack, major loop anode and negative terminal relay, pre-charge resistance and pre-charge-relay and circuit composition
The utility model monitoring device, the monitoring device are applied to cell switching system.Cell switching system is battery pack energy storage
System, battery pack energy-storage system refer to battery pack, high-voltage relay, BMS element circuit plate, high-tension connector, radiating module etc.
The general designation of attachment, battery pack energy-storage system output end are connected to Vehicular charger, DC/DC conversion equipment, electric machine controller, air-conditioning
The load equipments such as compressor.Branch 1 to branch 5 indicates detection node different in the system power circuit；The detection branch connects
It is connected to optocoupler gating module, corresponding detection branch is gated by microcontroller control and is generated in high pressure monitoring modular accordingly
Voltage, and the voltage signal is converted into certain digital quantity in high pressure monitoring modular, and pass to microcontroller；Then,
Microcontroller judges the corresponding relay status of the digital quantity for according to presetting relay different conditions lower threshold value；Finally,
After relay status all in circuit are summarized, it is reported to top level control unit, such as BMS controller.
According to one or more embodiment, high-voltage relay state on_line monitoring method is embodied in monitoring device
It is as follows:
Firstly, the present apparatus is automatically performed initial work after powering on, completed comprising microcontroller and top level control unit
Communication handshake process；
Then, top level control unit issues the operating mode instruction of current power distribution systems, i.e. notice microcontroller is current
Distribution system works in load output mode or power input mode；Microcontroller read work mode instruction and response；
Then, after top level control unit receives response message, high-voltage relay state on_line monitoring task will be started, and
Enabled instruction is handed down to microcontroller；
Finally, MCU will regularly circuit sequentially all relays in ground measure loop after MCU receives the enabled instruction
State；Corresponding detection branch is first gated according to current system operating mode, is then sent according to side of isolation digital analog converter
Digital information, then judge the state status of the relay contact；And it is reported to top level control unit at the appointed time.
According to one or more embodiment, as shown in Figure 6.The optocoupler of high-voltage relay state on_line monitoring device gates
Module includes the first optocoupler part, the second optocoupler part, third optocoupler part and the 4th optocoupler part.
The output port IO1 of microcontroller is sequentially connected in series resistance R3, the light emitting diode Q1 of the first optocoupler part input terminal,
Then the light emitting diode Q2 of two optocoupler part input terminals accesses the first ground connection.
The output port IO2 of microcontroller is sequentially connected in series resistance R4, the light emitting diode Q3 of third optocoupler part input terminal,
Then the light emitting diode Q4 of four optocoupler part input terminals accesses the first ground connection.
First monitoring node accesses high pressure detection module number by cathode, the first optocoupler part output end of connection diode D1
According to collection terminal AN1, meanwhile, the first monitoring node accesses second by anode, the third optocoupler part output end of connection diode D3
Ground connection.
Third monitoring node is grounded by the anode of connection diode D2, the second optocoupler part output end access second, meanwhile,
Third monitoring node accesses high pressure detection module data collection terminal by cathode, the 4th optocoupler part output end of connection diode D4
AN1。
If microcontroller detects major loop anode relay, and current power distribution systems work is loading output mode,
3 node potential of branch is higher than 1 node potential of branch i.e. in major loop anode branch, then IO1 exports low level, the high electricity of IO2 output
Flat, then Q1 and Q2 output end turns off, Q3 and Q4 output end is opened, then detection branch is made of R1, R2, D3 and D4.At this point, if
When major loop anode relay contact closure, then AN1 voltage signal U1 will be equal to the sum of the conduction voltage drop of D3 and D4 Ud；If main
When circuit anode relay contact disconnects, then AN1 voltage signal U2 will be equal to R1 and R2 electric resistance partial pressure value Ur；After detection,
IO1 and IO2 export low level.In short, when detection major loop anode relay status, and distribution system work is defeated in load
Mode out, microcontroller enables IO1 and exports low level, and enabled IO2 exports high level, and detects AN1 voltage value U1；If U1 etc.
In Ud, then it represents that relay is in closed state；If U1 is equal to Ur, then it represents that relay is in an off state.
If MCU detects major loop anode relay, and current power distribution systems work is in power input mode, i.e. major loop
In anode branch 1 node potential of branch be higher than 3 node potential of branch, then IO1 export high level, IO2 export low level, then Q1 and
Q2 output end is opened, Q3 and Q4 output end disconnects, then detection branch is made of R1, R2, D1 and D2.At this point, if major loop just
When holding relay contact closure, then AN1 voltage signal U3 will be equal to the sum of the conduction voltage drop of D1 and D2 Ud；If major loop anode
When relay contact disconnects, then AN1 voltage signal U4 will be equal to R1 and R2 electric resistance partial pressure value Ur；After detection, IO1 and IO2
Export low level.In short, when detection major loop anode relay status, and distribution system works in power input mode,
Microcontroller enables IO1 and exports high level, and enabled IO2 exports low level, and detects AN1 voltage value U2；If U2 is equal to Ud,
Indicate that relay is in closed state；If U2 is equal to Ur, then it represents that relay is in an off state.Threshold value Ud be 0.6V extremely
1.4V。
According to one or more embodiment, as shown in Figure 7.The optocoupler of high-voltage relay state on_line monitoring device gates
Module includes the 5th optocoupler part, the 6th optocoupler part, the 7th optocoupler part and the 8th optocoupler part.
The output port IO3 of microcontroller is sequentially connected in series resistance R7, the light emitting diode Q5 of the 5th optocoupler part input terminal,
Then the light emitting diode Q6 of six optocoupler part input terminals accesses the first ground connection.
The output port IO4 of microcontroller is sequentially connected in series resistance R8, the light emitting diode Q7 of the 7th optocoupler part input terminal,
Then the light emitting diode Q8 of eight optocoupler part input terminals accesses the first ground connection.
4th monitoring node accesses high pressure detection module number by cathode, the 5th optocoupler part output end of connection diode D5
According to collection terminal AN2, meanwhile, the 4th monitoring node accesses second by anode, the 7th optocoupler part output end of connection diode D7
Ground connection.
5th monitoring node is grounded by the anode of connection diode D6, the 6th optocoupler part output end access second, meanwhile,
5th monitoring node accesses high pressure detection module data collection terminal by cathode, the 8th optocoupler part output end of connection diode D8
AN2。
If microcontroller detects major loop negative terminal relay, and current power distribution systems work is loading output mode,
5 node potential of branch is higher than 4 node potential of branch i.e. in major loop anode branch, then IO3 exports low level, the high electricity of IO4 output
Flat, then Q5 and Q6 output end turns off, Q7 and Q8 output end is opened, then detection branch is made of R5, R6, D7 and D8.At this point, if
When major loop anode relay contact closure, then AN2 voltage signal U5 will be equal to the sum of the conduction voltage drop of D7 and D8 Ud；If main
When circuit anode relay contact disconnects, then AN2 voltage signal U6 will be equal to R5 and R6 electric resistance partial pressure value Ur；After detection,
IO3 and IO4 export low level.In short, when detection major loop negative terminal relay status, and distribution system work is defeated in load
Mode out, microcontroller enables IO3 and exports low level, and enabled IO4 exports high level, and detects AN2 voltage value U3；If U3 etc.
In Ud, then it represents that relay is in closed state；If U3 is equal to Ur, then it represents that relay is in an off state.
If MCU detects major loop negative terminal relay, and current power distribution systems work is in power input mode, i.e. major loop
In anode branch 4 node potential of branch be higher than 5 node potential of branch, then IO3 export high level, IO4 export low level, then Q5 and
Q6 output end is opened, Q7 and Q8 output end disconnects, then detection branch is made of R5, R6, D5 and D6.At this point, if major loop just
When holding relay contact closure, then AN2 voltage signal U5 will be equal to the sum of the conduction voltage drop of D5 and D6 Ud；If major loop anode
When relay contact disconnects, then AN2 voltage signal U6 will be equal to R5 and R6 electric resistance partial pressure value Ur；After detection, IO3 and IO4
Export low level.In short, when detection major loop negative terminal relay status, and distribution system works in power input mode,
Microcontroller enables IO3 and exports high level, and enabled IO4 exports low level, and detects AN2 voltage value U4；If U4 is equal to Ud,
Indicate that relay is in closed state；If U4 is equal to Ur, then it represents that relay is in an off state.Threshold value Ur be 3.7V extremely
4.5V。
According to one or more embodiment, as shown in Figure 8.The optocoupler of high-voltage relay state on_line monitoring device gates
Module includes the 9th optocoupler part, the tenth optocoupler part, the 11st optocoupler part and the 12nd optocoupler part.
The output port IO5 of microcontroller be sequentially connected in series resistance R11, the 9th optocoupler part input terminal light emitting diode Q9,
Then the light emitting diode Q10 of tenth optocoupler part input terminal accesses the first ground connection.
The output port IO6 of microcontroller is sequentially connected in series the light emitting diode of resistance R12, the 11st optocoupler part input terminal
Then the light emitting diode Q12 of Q11, the 12nd optocoupler part input terminal access the first ground connection.
Second monitoring node accesses high pressure detection module number by cathode, the 9th optocoupler part output end of connection diode D9
According to collection terminal AN3, meanwhile, anode of second monitoring node by connection diode D11, the 11st optocoupler part output end access the
Two ground connection.
Third monitoring node is grounded by the anode of connection diode D10, the tenth optocoupler part output end access second, together
When, third monitoring node accesses high pressure detection module data by cathode, the 12nd optocoupler part output end of connection diode D12
Collection terminal AN3.
If microcontroller detects precharge branch relay, and current power distribution systems work is loading output mode,
Then IO5 exports low level, and IO6 exports high level, then Q9 and Q10 output end disconnects, Q11 and Q12 output end is opened, then detects branch
Route R9, R10, D11 and D12 composition.At this point, if major loop anode relay and pre-charge-relay disconnect, AN3 electricity
Press signal that will be equal to the electric resistance partial pressure value of R10 and R9//Rp (the parallel resistance value of R9//Rp expression R9 and pre-charge resistance Rp)
Urp；If major loop anode relay disconnects and pre-charge-relay is closed, AN3 voltage signal will be equal to R9's and R10
Electric resistance partial pressure value Ur；If major loop anode relay and pre-charge-relay are closed, AN3 voltage signal will be equal to
The sum of the conduction voltage drop of D11 and D12 Ud；If when major loop anode relay closure and pre-charge-relay disconnection, AN3 electricity
Press signal that will be equal to the electric resistance partial pressure value Urp of R10 and R9//Rp.In short, when detection precharge branch relay status, and match
Electric system work is in load output mode, and microcontroller enables IO5 and exports low level, and enabled IO6 exports high level, and detects
AN3 voltage value U5；If U5 is equal to Urp, then it represents that pre-charge-relay is in an off state；If U5 is equal to Ur or Ud, table
Show that relay is in closed state.
If MCU detects precharge branch relay, and current power distribution systems work in power input mode, then IO5 is defeated
High level out, IO6 export low level, then Q9 and Q10 output end open, Q11 and Q12 output end disconnect, then detection branch by R9,
R10, D9 and D10 composition.At this point, AN3 voltage signal will if major loop anode relay and pre-charge-relay disconnect
Equal to the electric resistance partial pressure value Urp of R10 and R9//Rp (the parallel resistance value of R9//Rp expression R9 and pre-charge resistance Rp)；If main
When circuit anode relay disconnects and pre-charge-relay is closed, then AN3 voltage signal will be equal to the electric resistance partial pressure value of R9 and R10
Ur；If major loop anode relay and pre-charge-relay are closed, AN3 voltage signal will be equal to leading for D9 and D10
The sum of logical pressure drop Ud；If AN3 voltage signal will be equal to when major loop anode relay closure and pre-charge-relay disconnection
The electric resistance partial pressure value Urp of R10 and R9//Rp.In short, when detection precharge branch relay status, and distribution system work exists
Power input mode, microcontroller enables IO5 and exports high level, and enabled IO6 exports low level, and detects AN3 voltage value U6；
If U6 is equal to Urp, then it represents that pre-charge-relay is in an off state；If U6 is equal to Ur or Ud, then it represents that relay is in
Closed state.Threshold value Urp is 1.5V to 2.5V.
It is worth noting that being created although foregoing teachings describe the utility model by reference to several specific embodiments
Spirit and principle, it should be appreciated that, it is not limited to the specific embodiments disclosed for the utility model, draws to various aspects
Divide and does not also mean that the feature in these aspects cannot combine, it is this to divide the convenience merely to statement.The utility model purport
Covering various modifications and equivalent arrangements included in spirit and scope of the appended claims.
Claims (7)
1. a kind of high-voltage relay state on_line monitoring device, the online prison for the high-voltage relay in power battery pack circuit
It surveys, which is characterized in that the detection device includes:
Low-pressure control module, the module are made of linear stabilized power supply and microcontroller；
Signal isolation module, the module are made of isolating switch power, serial communication isolator and optocoupler gating module；
High pressure monitoring modular, the module are made of signal conversion module and signal sampling module, wherein
Microcontroller, serial communication isolator, signal sampling module and signal conversion module are sequentially connected, and optocoupler gating module is straight
Concatenation microcontroller and signal conversion module are connect,
Linear stabilized power supply is used to provide electric energy to the low-pressure control module and signal isolation module,
Micro controller module for determining high-voltage relay current state,
Isolating switch power is used to provide electric energy to the high pressure monitoring modular；
Serial communication isolator is for establishing serial communication link between microcontroller and high pressure monitoring modular；
Optocoupler gating module is used to select detection branch corresponding to current high-voltage relay to be measured for high pressure monitoring modular；
Signal conversion module is used to that the state of high-voltage relay contact to be converted into voltage by the detection branch currently gated
Signal；
Signal sampling module is used to acquire each voltage signal of signal conversion module offer, and is converted into digital quantity, passes through string
Row communication isolator passes to micro controller module.
2. high-voltage relay state on_line monitoring device according to claim 1, which is characterized in that the monitoring device is logical
Cross the detection branch access power battery pack circuit loop that 5 detection nodes of optocoupler gating module are formed, the power battery pack
Circuit includes power battery pack, major loop anode relay, major loop negative terminal relay, pre-charge resistance and precharge relay
Device,
It is in parallel with major loop anode relay after pre-charge resistance is connected with pre-charge-relay,
The anode of one end connection power battery pack of major loop anode relay, it is female that the other end connects the output of battery pack energy-storage system
Line anode BUS+,
The cathode of one end connection power battery pack of major loop negative terminal relay, it is female that the other end connects the output of battery pack energy-storage system
Line negative terminal BUS-,
First detection node connects pre-charge-relay and major loop anode relay, battery pack energy-storage system export bus anode
The tie point of BUS+,
Second detection node connects the tie point of pre-charge resistance and pre-charge-relay,
Third detection node connects the tie point of the anode of major loop anode relay and power battery pack, pre-charge resistance,
4th detection node connects the tie point of the cathode of major loop negative terminal relay and power battery pack,
5th detection node connects the tie point of major loop negative terminal relay and battery pack energy-storage system output bus negative terminal BUS-,
Optocoupler gating module is controlled by microcontroller, gates corresponding detection branch, is generated in high pressure monitoring modular corresponding
Voltage, and the voltage value is passed into microcontroller；
Then, microcontroller judges the corresponding height of the voltage value for according to presetting high-voltage relay different conditions lower threshold value
Potential relay state.
3. high-voltage relay state on_line monitoring device according to claim 2, which is characterized in that microcontroller is moved
In power battery circuit circuit after the state of all relays, it is reported to top level control unit.
4. high-voltage relay state on_line monitoring device according to claim 3, which is characterized in that the power battery pack
Circuit is used for electric car, and the top level control unit is the BMS controller of electric car.
5. high-voltage relay state on_line monitoring device according to claim 3, which is characterized in that optocoupler gating module packet
The first optocoupler part, the second optocoupler part, third optocoupler part and the 4th optocoupler part are included,
The output port IO1 of microcontroller is sequentially connected in series light emitting diode Q1, the second light of resistance R3, the first optocoupler part input terminal
Then the light emitting diode Q2 of coupling part input terminal accesses the first ground connection,
The output port IO2 of microcontroller is sequentially connected in series light emitting diode Q3, the 4th light of resistance R4, third optocoupler part input terminal
Then the light emitting diode Q4 of coupling part input terminal accesses the first ground connection,
First monitoring node is accessed high pressure detection module data and is adopted by cathode, the first optocoupler part output end of connection diode D1
Collect end AN1, meanwhile, the first monitoring node is grounded by the anode of connection diode D3, third optocoupler part output end access second,
Third monitoring node is grounded by the anode of connection diode D2, the second optocoupler part output end access second, meanwhile, third
Monitoring node accesses high pressure detection module data collection terminal AN1 by cathode, the 4th optocoupler part output end of connection diode D4.
6. high-voltage relay state on_line monitoring device according to claim 3, which is characterized in that optocoupler gating module packet
The 5th optocoupler part, the 6th optocoupler part, the 7th optocoupler part and the 8th optocoupler part are included,
The output port IO3 of microcontroller is sequentially connected in series light emitting diode Q5, the 6th light of resistance R7, the 5th optocoupler part input terminal
Then the light emitting diode Q6 of coupling part input terminal accesses the first ground connection,
The output port IO4 of microcontroller is sequentially connected in series light emitting diode Q7, the 8th light of resistance R8, the 7th optocoupler part input terminal
Then the light emitting diode Q8 of coupling part input terminal accesses the first ground connection,
4th monitoring node is accessed high pressure detection module data and is adopted by cathode, the 5th optocoupler part output end of connection diode D5
Collect end AN2, meanwhile, the 4th monitoring node is grounded by the anode of connection diode D7, the 7th optocoupler part output end access second,
5th monitoring node is grounded by the anode of connection diode D6, the 6th optocoupler part output end access second, meanwhile, the 5th
Monitoring node accesses high pressure detection module data collection terminal AN2 by cathode, the 8th optocoupler part output end of connection diode D8.
7. high-voltage relay state on_line monitoring device according to claim 3, which is characterized in that optocoupler gating module packet
The 9th optocoupler part, the tenth optocoupler part, the 11st optocoupler part and the 12nd optocoupler part are included,
The output port IO5 of microcontroller is sequentially connected in series resistance R11, the light emitting diode Q9 of the 9th optocoupler part input terminal, the tenth
Then the light emitting diode Q10 of optocoupler part input terminal accesses the first ground connection,
The output port IO6 of microcontroller is sequentially connected in series resistance R12, the light emitting diode Q11 of the 11st optocoupler part input terminal,
Then the light emitting diode Q12 of 12 optocoupler part input terminals accesses the first ground connection,
Second monitoring node is accessed high pressure detection module data and is adopted by cathode, the 9th optocoupler part output end of connection diode D9
Collect end AN3, meanwhile, the second monitoring node is connect by the anode of connection diode D11, the 11st optocoupler part output end access second
Ground,
Third monitoring node is grounded by the anode of connection diode D10, the tenth optocoupler part output end access second, meanwhile, the
Three monitoring nodes access the acquisition of high pressure detection module data by cathode, the 12nd optocoupler part output end of connection diode D12
Hold AN3.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109116230A (en) * | 2018-10-26 | 2019-01-01 | 常州索维尔电子科技有限公司 | High-voltage relay state on_line monitoring device and method |
| CN113933697A (en) * | 2021-10-13 | 2022-01-14 | 广州小鹏汽车科技有限公司 | Diagnostic device, diagnostic method and vehicle |
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2018
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109116230A (en) * | 2018-10-26 | 2019-01-01 | 常州索维尔电子科技有限公司 | High-voltage relay state on_line monitoring device and method |
| CN109116230B (en) * | 2018-10-26 | 2024-05-03 | 常州是为电子有限公司 | High-voltage relay state on-line monitoring device and method |
| CN113933697A (en) * | 2021-10-13 | 2022-01-14 | 广州小鹏汽车科技有限公司 | Diagnostic device, diagnostic method and vehicle |
| CN113933697B (en) * | 2021-10-13 | 2023-10-31 | 广州小鹏汽车科技有限公司 | Diagnostic device, diagnostic method and vehicle |
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Address after: 213300 building 19, No. 618, wharf West Street, Kunlun Street, Liyang City, Changzhou City, Jiangsu Province Patentee after: Changzhou Shiwei Electronics Co.,Ltd. Address before: 213000 Room 305, building 1, No. 618, wharf West Street, Kunlun Street, Liyang City, Changzhou City, Jiangsu Province Patentee before: CHANGZHOU SOARWHALE ELECTRONIC TECHNOLOGY Co.,Ltd. |