CN107681707A - A kind of automobile and automobile power supply system dormancy control circuit - Google Patents

A kind of automobile and its electric power system dormancy control circuit, including startup power supply, BMS main frames and at least one BMS slaves, CAN, at least one supply voltage detection unit and at least one slave PMU；The slave PMU be connected to corresponding between the BMS slaves and startup power supply；Wherein, the BMS main frames enter starting state and resting state according to the enabling signal and stop signal of automobile, and control and power and power off to the CAN；The slave PMU controls electricity or power-off on the connected BMS slaves according to the supply voltage of the CAN.According to the start and stop state of automobile, by the power supply of all BMS slaves of BMS host computer controls, to ensure that automobile is stopping all slave module all power down dormancy in the case of, once automobile starting is waken up all slave module normal works by main frame again, the power consumption of system is greatly reduced, avoids startup power supply under-voltage or off-capacity.

A kind of automobile and automobile power supply system dormancy control circuit

Technical field

The present invention relates to battery control technology, more particularly to a kind of automobile and automobile power supply system dormancy control circuit.

Background technology

At present, all power supplies of BMS (Battery Management System, battery management system) system are all from vapour Automobile battery 12V/24V D/C powers are powered, and BMS systems are in continuous state during automobile parking, and battery capacity is limited, to certain Time storage battery energy can be depleted so that BMS system cisco unity malfunctions.

With the high speed development of New-energy electric vehicle, increasingly harsher is required from power consumption to the BMS systems of electric automobile, mesh Preceding electric automobile BMS electric power system is essentially all the electric power system of power taking, at present slave on storage battery is started：

1. vehicle storage battery is for often electricity：All slave modules pass through CAN (Controller Area Network, controller LAN) bus connection, wherein CAN include CAN+ ports, CAN- ports, GND ports, VCC+ ports, VCC- ports, Wherein VCC+ ports and VCC- ports is taken from the startup power supply of automobile.Shortcoming has：All slave modules are serially connected in bus, When a node power is destroyed follow-up module and will be stopped in bus；, can not when startup power supply is under-voltage or off-capacity All slave modules will be stopped when providing stable power supply for slave module.

2. the power taking in battery case, several batteries are taken to be used for powering to slave.Shortcoming has：CAN power supply disunity, can make Disturbed into bus；The inconsistency that slave module can cause battery using startup power supply power supply always increases into degree.

The content of the invention

Based on this, it is necessary to provide a kind of automobile power supply system dormancy control saved system energy consumption, reduce bus interference Circuit.

The invention provides a kind of automobile power supply system dormancy control circuit, including startup power supply and the startup power supply The BMS main frames of connection and at least one BMS slaves being connected with the BMS main frames also include the CAN being connected with the BMS main frames The supply voltage detection unit and at least one and power supply that bus, at least one power line with the CAN are connected The slave PMU of voltage detection unit connection；The slave PMU be connected to corresponding to the BMS from Between machine and startup power supply；

Wherein, the BMS main frames enter starting state and resting state according to the enabling signal and stop signal of automobile, and Control and power and power off to the CAN；The slave PMU controls according to the supply voltage of the CAN Electricity or power-off on the connected BMS slaves.

Preferably, the slave PMU includes controller and voltage conversion circuit, the voltage conversion circuit Connected with the power port of the startup power supply and the corresponding BMS slaves；The controller detects with the supply voltage Unit and voltage conversion circuit connection, the controller control institute according to the supply voltage of the power line of the CAN State voltage conversion circuit work.

Preferably, the voltage conversion circuit is Buck circuits or Boost circuit.

Preferably, the controller is boost pressure controller or buck controller.

Preferably, the slave PMU also includes switching switch, and the switching switch is connected to the startup Power supply connects with the supply voltage detection unit, for controlling the slave PMU to be cut between automatically and manually Change.

Preferably, the supply voltage detection unit includes photoelectrical coupler, the input termination institute of the photoelectrical coupler The power line of CAN is stated, the photoelectrical coupler output connects the controller.

Present invention also offers a kind of automobile, including above-mentioned automobile power supply system dormancy control circuit.

A kind of automobile, including above-mentioned automobile power supply system dormancy control circuit.

Above-mentioned automobile power supply system dormancy control circuit, according to the start and stop state of automobile, by all BMS of BMS host computer controls The power supply of slave, to ensure that automobile is stopping all slave module all power down dormancy in the case of, once automobile starting All slave module normal works are waken up by main frame again, greatly reduce the power consumption of system, avoids startup power supply under-voltage or holds Amount deficiency；In addition, uniformly providing the insulating power supply in CAN by BMS main frames, the CAN isolation electricity on each BMS slaves is reduced The cost in source, it is simpler in CAN structure, avoid causing bus to disturb.

Brief description of the drawings

Fig. 1 is the module diagram of automobile power supply system dormancy control circuit in present pre-ferred embodiments；

Fig. 2 is the circuit theory diagrams of automobile power supply system dormancy control circuit in first embodiment of the invention；

Fig. 3 is the circuit theory diagrams of automobile power supply system dormancy control circuit in second embodiment of the invention.

Embodiment

In order that technical problems, technical solutions and advantageous effects to be solved by the present invention are more clearly understood, below in conjunction with Drawings and Examples, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein is only used To explain the present invention, it is not intended to limit the present invention.

Fig. 1 and Fig. 2 are referred to, automobile power supply system dormancy control circuit includes startup power supply in present pre-ferred embodiments 110th, the BMS main frames 120 and at least one BMS slaves 130 being connected with BMS main frames 120 being connected with startup power supply 110, are also wrapped Include the CAN 140 being connected with BMS main frames 120, the supply voltage detection that at least one power line with CAN 140 is connected Unit 150 and at least one slave PMU 160 being connected with supply voltage detection unit 150；Slave power management Unit 160 is connected between corresponding BMS slaves 130 and startup power supply 110；Wherein, BMS main frames 120 are normal by startup power supply 110 Power supply, BMS main frames 120 enter starting state and resting state according to the enabling signal and stop signal of automobile, and control to CAN Bus 140 is powered and powered off；Slave PMU 160 controls connected according to the supply voltage of CAN 140 Electricity or power-off on BMS slaves 130.

BMS main frames 120 provide the insulating power supply VCC+ and VCC- of all CAN 140 of system, and with CAN+, CAN-, GND forms CAN 140 and is connected with BMS slaves 130.

When the car is stopped, BMS main frames 120 receive the insulating power supply VCC+ of CAN 140 after stop signal and VCC- is closed, and BMS main frames 120 oneself enter dormancy low power consumpting state；Supply voltage detection unit 150 does not detect that CAN is total During the supply voltage of the power line of line 140, feed back to slave PMU 160, slave PMU 160 by oneself Cut-out battery powered circuit causes BMS slaves 130 to be in power-down state, reaches dormancy purpose；During normal work, work as automotive ignition During startup, BMS main frames 120 receive enabling signal and automatically waken up, and insulating power supply, supply voltage detection are provided to CAN 140 Unit 150 detects the power supply signal of the power line of bus, and this signal is fed back into slave PMU 160, slave PMU 160 connects the supply line of startup power supply 110 and BMS slaves 130, and BMS slaves 130 are started working.

In the present embodiment, slave PMU 160 includes voltage conversion circuit 162 and controller 164, voltage conversion Circuit 162 connects with the power port of startup power supply 110 and corresponding BMS slaves 130；Controller 164 detects with supply voltage Unit 150 and voltage conversion circuit 162 connect, and controller 164 controls electricity according to the supply voltage of the power line of CAN 140 Voltage conversion circuit 162 works.

Preferably, voltage conversion circuit 162 is Buck circuits or Boost circuit.

Preferably, with reference to figure 3, slave PMU 160 also includes switching switch S4, and switching switch S4, which is connected to, to be opened Dynamic power supply 110 and supply voltage detection unit 150 connect, for controlling slave PMU 160 between automatically and manually Switching.

Supply voltage detection unit 150 includes photoelectrical coupler OP1, photoelectrical coupler OP1 input termination CAN 140 power line, photoelectrical coupler OP1 outputs connect controller 164.Preferably, controller 164 is boost pressure controller 164 or drop Pressure controller 164.Supply voltage detection unit 150 can be one multiple, when being one, each slave PMU 160 detect the supply voltage of CAN 140 by the supply voltage detection unit 150；For it is multiple when, it is each from electromechanical source Administrative unit 160 detects the supply voltage of CAN 140 by corresponding supply voltage detection unit 150 respectively.

Switching switch S4 is single-pole double-throw switch (SPDT), and its moved end connects startup power supply 110, the first motionless termination photoelectrical coupler The input of OP1 light-receiving devices, the output end of the second motionless termination photoelectrical coupler OP1 light-receiving devices and the test side of controller 164 Mouthful.Realize that control slave PMU 160 switches between automatically and manually.When moved end engages with the first motionless end, slave PMU 160 is in auto state, is worked according to the detection signal of supply voltage detection unit 150.Moved end and second During motionless end engagement, slave PMU 160 is in manual mode, always on startup power supply 110.

Light-receiving device of the detection port (enabled pin ENABLE as shown in Figure 3) of controller 164 with photoelectrical coupler OP1 End connection, when the power line of CAN 140 is powered, photoelectrical coupler OP1 light emitting source conducting so that photoelectrical coupler OP1 Light-receiving device be also switched on, the detection port of controller 164 is placed in low level, then (such as Fig. 3 is shown the control port of controller 164 Output pin GDRV) output pwm signal control voltage change-over circuit 162 (specifically controlling metal-oxide-semiconductor) work make from electromechanical source Administrative unit 160 has voltage output to BMS slaves 130.When the power line power down of CAN 140, the detection of controller 164 Port is placed in high level, and the control port of controller 164 exports without pwm signal, and voltage conversion circuit 162 turns off, and no-voltage is defeated Go out to BMS slaves 130, for holding state.

It is understood that the test side mouth of controller 164 is really the power supply ground terminal in slave PMU 160 Mouthful, when the port is placed in level, controller 164 and voltage conversion circuit 162 work, electric on BMS slaves 130；Conversely, control Device 164 and voltage conversion circuit 162 do not work, the power down of BMS slaves 130.

Present invention also offers a kind of automobile, including above-mentioned automobile power supply system dormancy control circuit.

Above-mentioned automobile power supply system dormancy control circuit, according to the start and stop state of automobile, controlled by BMS main frames 120 all The power supply of BMS slaves 130, to ensure that automobile is stopping all slave module all power down dormancy in the case of, once vapour Car starts is waken up all slave module normal works by main frame again, is greatly reduced the power consumption of system, is avoided startup power supply 110 Under-voltage or off-capacity；In addition, by the unified insulating power supply provided in CAN 140 of BMS main frames 120, reduce each BMS from The cost of CAN insulating power supplies on machine 130, it is simpler in the structure of CAN 140, avoid causing bus to disturb.

These are only presently preferred embodiments of the present invention, be not intended to limit the invention, it is all the present invention spirit and All any modification, equivalent and improvement made within principle etc., should be included in the scope of the protection.