Low-voltage power transmission system, DCDC converter, control method, device, and medium

1. A control method applied to a direct current DCDC converter, comprising:

acquiring (S 210 ) a charging signal;

acquiring (S 220 ) a vehicle start signal;

acquiring (S 230 ) an enabling signal;

when each of the charging signal, the vehicle start signal, and the enabling signal is at a low level, and no communication message sent by a battery management system, BMS, is received, determining (S 240 ) that a vehicle is in a power-off state and enters a sleep mode;

when a duration of the sleep mode reaches a preset duration, performing (S 250 ) self-awakening, and outputting, to the BMS, an awakening signal for awakening the BMS and making the BMS enter a working mode; and

the control method is characterized in that:

the communication message comprises a first communication message allowing output from the DCDC converter and a second communication message prohibiting output from the DCDC converter, and the control method further comprises:

when the charging signal is at a low level, the vehicle start signal is at a high level, and the first communication message is received, or when the charging signal is at a low level, the vehicle start signal and the enable signal are at a high level, and the communication message is not received, determining that the vehicle is in a traveling state; and

under a condition that the vehicle is determined in the traveling state, outputting a third power signal, the third power signal being determined according to power demand of a target power consuming module and configured to supply power to the target power consuming module;

wherein when a low-voltage power supply loop for connecting a low-voltage power supply and the DCDC converter is turned off, the DCDC converter supplies power to the target power consuming module through the third power signal, the target power consuming module comprises a low-voltage power consuming component, and the low-voltage power consuming component comprises the BMS;

wherein under a condition that the low-voltage power supply loop is turned on, when an output voltage of the low-voltage power supply is greater than an output voltage of the DCDC converter, the power demand of the target power consuming module is zero and the third power signal is equal to zero, and when the output voltage of the low-voltage power supply is less than or equal to the output voltage of the DCDC converter, the DCDC converter supplies power to the target power consuming module through the third power signal and the target power consuming module comprises the low-voltage power supply and the low-voltage power consuming component.

2. The control method according to claim 1 , wherein after the when a duration of the sleep mode reaches a preset duration, performing self-awakening, the control method further comprises:

outputting a first power signal, and the first power signal being for supplying power to the BMS.

3. The control method according to claim 1 , wherein the control method further comprises:

under a condition that the charging signal is at a high level, when the first communication message is received or the communication message is not received, determining that the vehicle is in a charging state.

4. The control method according to claim 3 , wherein after the determining that the vehicle is in a charging state, the control method further comprises:

outputting a second power signal, the second power signal being determined according to power demand of a target power consuming module and configured to supply power to the target power consuming module;

wherein when a low-voltage power supply loop for connecting a low-voltage power supply and the DCDC converter is turned off, the DCDC converter supplies power to the target power consuming module through the second power signal, the target power consuming module comprises a low-voltage power consuming component, and the low-voltage power consuming component comprises the BMS;

wherein under a condition that the low-voltage power supply loop is turned on, when an output voltage of the low-voltage power supply is greater than an output voltage of the DCDC converter, the power demand of the target power consuming module is zero and the second power signal is equal to zero, and when the output voltage of the low-voltage power supply is less than or equal to the output voltage of the DCDC converter, the DCDC converter supplies power to the target power consuming module through the second power signal and the target power consuming module comprises the low-voltage power supply and the low-voltage power consuming component.

5. The control method according to claim 1 , wherein the control method further comprises:

when the first communication message is received and the charging signal and the vehicle start signal are at a high level, or when the second communication message is received, determining that the vehicle is in a standby state.

6. The control method according to claim 1 , wherein the control method further comprises:

when the first communication message is received and the charging signal and the vehicle start signal are at a low level, determining that the vehicle is in a target state in which the vehicle is waiting to enter the sleep mode.

7. The control method according to claim 1 , wherein the control method further comprises:

when no communication message sent by the BMS is received, the charging signal and the vehicle start signal are at a low level, and the enabling signal is at a high level, determining that the vehicle is in a fault state.

8. A DCDC converter, comprising:

a parameter acquiring module ( 410 ) configured to acquire (S 210 , S 220 , S 230 ) a charging signal, a vehicle start signal, and an enabling signal;

a control module ( 420 ) configured to determine (S 240 ) that a vehicle is in a power-off state and enters a sleep mode when each of the charging signal, the vehicle start signal, and the enabling signal is at a low level, and no communication message sent by a battery management system, BMS, is received;

a self-awakening module ( 430 ) configured to perform (S 250 ) self-awakening and output, to the BMS, an awakening signal for awakening the BMS and making the BMS enter a working mode, when a duration of the sleep mode reaches a preset duration; and

the DCDC converter is characterized in that:

the communication message comprises a first communication message allowing output from the DCDC converter and a second communication message prohibiting output from the DCDC converter, and the DCDC converter further comprises:

a state determining module configured to determine that the vehicle is in a traveling state, when the charging signal is at a low level, the vehicle start signal is at a high level, and the first communication message is received, or when the charging signal is at a low level, the vehicle start signal and the enable signal are at a high level, and the communication message is not received; and

a third outputting module configured to, under a condition that the vehicle is determined in the traveling state, output a third power signal, the third power signal being determined according to power demand of a target power consuming module and configured to supply power to the target power consuming module;

wherein when a low-voltage power supply loop for connecting a low-voltage power supply and the DCDC converter is turned off, the DCDC converter supplies power to the target power consuming module through the third power signal, the target power consuming module comprises a low-voltage power consuming component, and the low-voltage power consuming component comprises the BMS;

wherein under a condition that the low-voltage power supply loop is turned on, when an output voltage of the low-voltage power supply is greater than an output voltage of the DCDC converter, the power demand of the target power consuming module is zero and the third power signal is equal to zero, and when the output voltage of the low-voltage power supply is less than or equal to the output voltage of the DCDC converter, the DCDC converter supplies power to the target power consuming module through the third power signal and the target power consuming module comprises the low-voltage power supply and the low-voltage power consuming component.

9. The DCDC converter according to claim 8 , wherein the DCDC converter comprises a phase-shifted full-bridge unit.

10. A low-voltage power transmission system, characterized by comprising:

a battery management system and the DCDC converter according to claim 8 .

11. The low-voltage power transmission system according to claim 10 , wherein:

the low-voltage power supply is connected to the DCDC inverter and the battery management system each through the low-voltage power supply loop.

12. The low-voltage power transmission system according to claim 11 , further comprising:

a state parameter transmitting apparatus configured to acquire a state parameter of a battery pack from the battery management system, and transmit the state parameter of the battery pack to a remote monitoring platform.

13. A non-transitory computer storage medium having computer program instructions stored thereon, wherein the computer program instructions, when being executed by a processor of a control device for a DCDC converter, implement the control method according to claim 1 .