A kind of relay anti-adhesion circuitTechnical field
The present invention relates to a kind of battery of electric vehicle management system, especially a kind of relay anti-adhesion circuit.
Background technology
Current batteries of electric automobile capacity is increasing, and voltage is more and more higher, often runs into relay adhesion problems by the break-make between Control electrokinetic cell and motor, causes relay to be failed to act when one should, and brings the danger being difficult to expect.
The method that existing battery management system adopts battery positive and negative electrode to control separately mostly, namely the connection of positive pole and negative pole and motor is respectively by a Control, two relays, respectively by two port controlling of ECU, also need two relay adhesion state-detection ports in addition.Relay adhesion state completes judgement by software and deals with, takies ECU resource many.Only adopt one-side treatment measures, reliability is short of to some extent.
Summary of the invention
In view of this, the invention provides a kind of reliable and stable relay anti-adhesion circuit.
The design that the present invention takes is:
A kind of relay anti-adhesion circuit, comprise, have the first relay of two-way contact, the second relay, the first via contact of two relays is all connected in application circuit, second contact, tunnel and first via contact controlled actuation simultaneously, the adhesion status signal of output-response first via contact; First same or door, its input accesses the control signal of the first relay and the adhesion status signal of the first relay respectively; Output connects the control circuit of the second relay; Second same or door, its input accesses the control signal of the second relay and the adhesion status signal of the second relay respectively; Output connects the control circuit of the first relay.
Concrete, described relay anti-adhesion circuit also comprises the warning circuit being respectively used to instruction first relay, the second relay adhesion state, in described warning circuit, alarm appliance positive pole connects power supply, negative pole connect respectively first with or door, second with or the output of door.
Further, the control circuit of first, second relay described comprises first, second auxiliary relay respectively, first, second additional relay contacts is respectively used to the break-make controlling first, second relay coil power supply, control coil one end connects power supply, and the other end is respectively by switch triode ground connection.
Further, the first relay control signal and second with or door output signal and jointly inputs first and door, first and door export switch triode in control first control relay circuit; Second relay control signal and first with or door output signal and jointly inputs second and door, second and door export switch triode in control second control relay circuit.Connected by triode stability contorting relay switch.
Further, described circuit application is in battery management system control circuit, and described first relay is total positive relay in battery management system control circuit, and the second relay is battery management system control circuit always negative relay.
Compared with prior art, tool of the present invention has the following advantages:
1, when the relay by big current sticks together fault, by with or door and control circuit can circulate a notice of in time and cut off the connection of another one relay, make the security performance of electric motor car, unfailing performance improve greatly.2, circuit is simple, cuts off or connects, greatly improve the stability of circuit by means of only hardware trigger control relay.3, only this function can be realized with a little conventional components and parts, with low cost.
Accompanying drawing explanation
Fig. 1 is the circuit theory schematic diagram of the embodiment of the present invention.
Embodiment
In order to allow those skilled in the art understand technical scheme of the present invention better, below in conjunction with accompanying drawing, the present invention is further elaborated.
As shown in Figure 1, relay anti-adhesion circuit described in the present embodiment is applied in battery management system control circuit, comprise, there is the first relay 1, second relay 2 of two-way contact, first relay 1 is total positive relay in battery management system control circuit, and the second relay 2 is battery management system control circuit always negative relay.The two contacts of two relays is controlled actuation simultaneously, by the adhesion status signal of the State-output reaction forming that detects the second contact, tunnel total first via contact just, in total negative wire road in battery management system.
First same or door L1, its input accesses the control signal of the first relay 1 and the adhesion status signal of the first relay respectively; Output connects first in the second relay 2 control circuit and door L3; Second same or door L2, its input accesses the control signal of the second relay and the adhesion status signal of the second relay respectively; Output connects second and door L4 of the first control relay circuit.The control circuit of first, second relay 1,2 described comprises first, second auxiliary relay 3,4 respectively, first, second auxiliary relay 3,4 contact is respectively used to the break-make controlling first, second relay coil power supply, control coil one end connects power supply, and the other end is respectively by switch triode T1, T2 ground connection.First relay 1 control signal and second with or door L2 output signal and jointly input first and door L3, first and door L3 export switch triode T1 in control first control relay circuit; Second relay control signal and first with or door L1 output signal and jointly input second and door L4, second and door L4 export switch triode T2 in control second control relay circuit.Described triode is preferably NPN triode.According to above-mentioned annexation, the fault if the first relay 1 sticks together, namely the first relay control signal is low level, and adhesion status signal is high level, now, control signal and adhesion status signal export a low level together or after door through first, second relay disconnects thereupon, in like manner, the fault if the second relay sticks together, the first relay disconnects.
Described relay anti-adhesion circuit also comprises the warning circuit being respectively used to instruction first relay 1, second relay 2 adhesion state, in described warning circuit, alarm appliance LED1, LED2 positive pole connects power supply, negative pole connect respectively first with or door L1, second with or the output of door L2.The fault if the first relay 1 sticks together, control signal and adhesion status signal are through exporting a low level together or after door L1, and LED2 lights warning, and the fault if the second relay 2 sticks together, LED1 lights warning.
It is more than the present invention's preferably implementation; it should be noted that; when not deviating from the present invention's spirit and essence thereof; those of ordinary skill in the art are when making various corresponding change and distortion according to the present invention, but these change and are out of shape the protection range that all should belong to the claim appended by the present invention.