CN110473742B - High-voltage relay control circuit, battery management system and electronic device - Google Patents
High-voltage relay control circuit, battery management system and electronic device Download PDFInfo
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- CN110473742B CN110473742B CN201810444959.2A CN201810444959A CN110473742B CN 110473742 B CN110473742 B CN 110473742B CN 201810444959 A CN201810444959 A CN 201810444959A CN 110473742 B CN110473742 B CN 110473742B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/002—Monitoring or fail-safe circuits
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/02—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay
- H01H47/18—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay for introducing delay in the operation of the relay
Abstract
The invention provides a high-voltage relay control circuit, a battery management system and an electronic device, wherein the high-voltage relay control circuit comprises a first signal input module, a second signal input module, a first selection module, a second selection module, a first switch module, a second switch module and a time delay turn-off module, when an enable signal is in a first state, the high-voltage relay can be attracted, when the enable signal is changed from the first state to a second state, the attraction time of the high-voltage relay can be prolonged, so that the high-voltage relay can be ensured to be attracted in the reset and recovery period of a controller when the controller for providing the first control signal and the second control signal is in failure or the normal control logic of the high-voltage relay is in unpredictable failure, the accidental interruption of the high-voltage relay is avoided, and the arc-drawing phenomenon of the high-voltage relay is avoided, the risk of damage of the high-voltage relay is reduced; the battery management system and the electronic device are provided with the high-voltage relay control circuit.
Description
Technical Field
The invention relates to the technical field of high-voltage relay control, in particular to a high-voltage relay control circuit, a battery management system and an electronic device.
Background
In recent years, domestic electric vehicles have been developed rapidly under the national strategic arrangement, but the market and the technology are immature, and a plurality of problems are exposed, wherein the safety problem is particularly prominent. The high-voltage relay is the most important actuator of a Battery Management System (BMS), which affects the safety and dynamic performance of the entire vehicle.
Accidental interruption (i.e., unexpected interruption) of a high-voltage relay is the most common and most serious relay failure mode, and is embodied in an electric vehicle as follows: the relay is accidentally cut off with load, so that the relay is subjected to arc discharge, and the temperature of the relay is increased or even the relay is exploded. The reasons for the unexpected interruption of the high-voltage relay mainly include: BMS controller failures, unreasonable control strategies, high voltage relay quality issues, etc. At present, the explosion-proof high-voltage relay with high performance is also available in the market, but the high-voltage relay is expensive, so that the explosion-proof high-voltage relay is difficult to be widely applied under the market trend of low cost of electric vehicles, and the whole vehicle enterprise is more inclined to solve the problem of accidental interruption of the high-voltage relay from the aspects of a reasonable control strategy and a high-quality BMS controller.
Disclosure of Invention
The invention aims to provide a high-voltage relay control circuit, a battery management system and an electronic device, which can solve the problem of accidental interruption of some high-voltage relays.
In order to achieve the above object, the present invention provides a high-voltage relay control circuit comprising:
the first signal input module is used for transmitting a first control signal to the first selection module when an enable signal is in a first state, and the first switch module is also connected with a battery pack and a high-voltage relay and used for establishing, maintaining or delaying to turn off a first passage between the battery pack and the high-voltage relay under the control of the signal output by the first selection module;
the second signal input module is used for transmitting a second control signal to the second selection module when the enable signal is in a first state, and the second switch module is also connected with the high-voltage relay and the ground and used for establishing, maintaining or delaying to turn off a second path between the high-voltage relay and the ground under the control of the signal output by the second selection module;
and the delay turn-off module is connected with the first selection module and the second selection module and is used for outputting corresponding delay control signals to the first selection module and the second selection module when the enable signal is changed from the first state to the second state so as to control the delay turn-off of the first path and the second path.
Optionally, the delay turn-off module includes an energy storage capacitor, a resistor, a capacitor charging branch and a capacitor discharging branch; one end of the capacitor charging branch circuit is connected with one end of the capacitor discharging branch circuit and the upper pole plate of the energy storage capacitor, and the other end of the capacitor charging branch circuit is connected with a power supply voltage and used for charging the energy storage capacitor through the power supply voltage when the enabling signal is in a first state and stopping charging the energy storage capacitor when the enabling signal is in a second state; the other end of the capacitor discharging branch circuit is grounded and used for discharging the energy storage capacitor when the enabling signal is in a first state and the high-voltage relay is in a power-off state; the energy storage capacitor and the resistor are connected in parallel to form an RC delay branch circuit, and the RC delay branch circuit is used for outputting corresponding delay control signals to the first selection module and the second selection module after the enabling signals are changed from the first state to the second state so as to control the delay turn-off of the first access and the second access.
Optionally, the capacitor charging branch and the capacitor discharging branch include two inverted MOS transistors or triodes connected together.
Optionally, the first signal input module includes a first and gate or a first nand gate, one input end of the first and gate or the first nand gate receives the enable signal, the other input end of the first and gate or the first nand gate receives the first control signal, and an output end of the first and gate or the first nand gate is connected to the first selection module.
Optionally, the second signal input module includes a second and gate or a second nand gate, one input end of the second and gate or the second nand gate receives the enable signal, the other input end of the second and gate or the second nand gate receives the second control signal, and an output end of the second and gate or the second nand gate is connected to the second selection module.
Optionally, the first selection module includes a first or gate or two first diodes, one input end of the first or gate is connected to the first signal input module, the other input end of the first or gate is connected to the delay turn-off module, and an output end of the first or gate is connected to the first switch module; one of the two first diodes is connected between the first signal input module and the first switch module, and the other first diode is connected between the time delay turn-off module and the first switch module.
Optionally, the second selection module includes a second or gate or two second diodes, one input end of the second or gate is connected to the second signal input module, the other input end of the second or gate is connected to the delay turn-off module, and an output end of the second or gate is connected to the second switch module; one of the two second diodes is connected between the second signal input module and the second switch module, and the other second diode is connected between the delay turn-off module and the second switch module.
Optionally, the first switch module includes a first MOS transistor whose gate is connected to the first selection module, and/or the second switch module includes a second MOS transistor whose gate is connected to the second selection module.
The invention also provides a battery management system, which comprises a controller, a battery pack, a high-voltage relay and the high-voltage relay control circuit, wherein the controller is used for providing the first control signal, the second control signal and the enabling signal for the high-voltage relay control circuit, the battery pack is connected with a first switch module of the high-voltage relay control circuit, and the high-voltage relay is respectively connected with the first switch module and a second switch module of the high-voltage relay control circuit.
The invention also provides an electronic device comprising the battery management system.
Optionally, the electronic device is an electric vehicle.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
1. in the high-voltage relay control circuit, when an enabling signal is in a first state, a first control signal can be transmitted to one side of a high-voltage relay through the first signal input module, the first selection module and the first switch module in sequence, and simultaneously a second control signal is transmitted to the other side of the high-voltage relay through the second signal input module, the second selection module and the second switch module in sequence so as to pull in the high-voltage relay, when the enabling signal is changed from the first state to the second state, the control signal can be continuously transmitted to the two sides of the high-voltage relay through the first selection module, the first switch module, the second selection module and the second switch module through the delay turn-off module so as to prolong the pull-in time of the high-voltage relay, so that when a controller providing the first control signal and the second control signal fails or when the normal control logic of the high-voltage relay fails unpredictably, the high-voltage relay is ensured to be kept in actuation in the period of resetting and recovering of the controller and the like, so that the accidental interruption of the high-voltage relay is avoided, the arc discharge phenomenon of the high-voltage relay is avoided, and the risk of damage of the high-voltage relay is reduced.
2. The battery management system and the electronic device have higher operation safety due to the adoption of the high-voltage relay control circuit.
Drawings
FIG. 1 is a schematic diagram of a circuit structure of a high-voltage relay control circuit;
FIG. 2 is a system block schematic diagram of the high voltage relay control circuit of the present invention;
fig. 3 is a schematic circuit diagram of a high-voltage relay control circuit according to an embodiment of the invention;
FIG. 4 is a schematic diagram of electrical signals of the high voltage relay control circuit shown in FIG. 3 during a successful MCU reset;
FIG. 5 is an electrical signal schematic diagram of the high voltage relay control circuit shown in FIG. 3 during a failed reset of the MCU;
FIG. 6 is a schematic circuit diagram of a high voltage relay control circuit according to yet another embodiment of the present invention;
fig. 7 is a schematic block diagram of a battery management system according to an embodiment of the present invention.
Detailed Description
Referring to fig. 1, a high voltage relay control circuit includes a high side S1 switch and a low side S2 switch, the high side S1 switch and the low side S2 switch are switches inside a battery management controller (hereinafter abbreviated as BMC) for commonly controlling a high voltage relay, S1 and S2 are respectively controlled by a first control signal C1 and a second control signal C2, the signal sources of C1 and C2 are MCUs (not shown) of the BMC controller, S1 and S2 further have a common enable signal WDA, the control signals C1, C2 and WDA signals can be input to S1 and S2 through corresponding and gates, the WDA signal represents an operating state of the MCUs, when the MCUs are normal, the WDA signal is high, the MCU is abnormal, the WDA signal is low, and when the WDA signal is high, the C1 and C2 can control the S1 and S585, and the high side S1 switch and the low side S2 switch are simultaneously turned on, the high side S1 and the high side switch is simultaneously pulled, so that the battery pack BAT supplies power to the entire system.
Due to the characteristics of the electronic device, the MCU is used as a complex logic device, various hardware or software errors can occur in the working process, the MCU is in a fault state or unpredictable failures occur in normal control logic of C1 and C2 for controlling a high-voltage relay, so that a WDA signal is changed into a low level, and meanwhile, the MCU is subjected to reset operation. However, during the period of resetting the MCU, the high-voltage relay may be accidentally interrupted (or accidentally disconnected), and arcing may occur, which may cause the temperature of the relay to rise or even cause the relay to explode.
Based on this, the invention provides a high-voltage relay control circuit, a battery management system and an electronic device, after a WDA signal is changed from a high level to a low level (for example, a fault occurs in an MCU or unpredictable failure occurs in normal control logic of C1 and C2 for controlling the high-voltage relay), the switches S1 and S2 are still kept in a conducting state for a period of time by using a time-delay turn-off function, so that the high-voltage relay can still keep a suction state in the reset process of the MCU, the accidental interruption of the high-voltage relay is avoided, the arc-drawing phenomenon of the high-voltage relay is avoided, and the risk of the damage of the high-voltage relay is reduced.
The present invention will be described in more detail with reference to the accompanying drawings, which are included to illustrate embodiments of the present invention.
Referring to fig. 2, the present invention provides a high voltage relay control circuit, including: the high-voltage relay circuit comprises a first signal input module 11, a second signal input module 12, a first selection module 13, a second selection module 14, a first switch module 15, a second switch module 16 and a delay turn-off module 17, wherein the first signal input module 11, the first selection module 13 and the first switch module 15 are sequentially connected to one control edge (for example, a high edge) of the high-voltage relay 10 in series, the first switch module 15 is further connected with a battery pack BAT and the high-voltage relay 10, the second signal input module 12, the second selection module 14 and the second switch module 16 are sequentially connected to the other control edge (for example, a low edge) of the high-voltage relay 10 in series, the second switch module 16 is further connected with the high-voltage relay 10 and the ground, and the delay turn-off module 17 is simultaneously connected with the first selection module 13 and the second selection module 15.
The first signal input module 11 has an input terminal receiving the first control signal C1, another input terminal receiving the enable signal WDA, and an output terminal connected to an input terminal of the first selection module 13; the second signal input module 12 has an input terminal receiving the second control signal C2, another input terminal receiving the enable signal WDA, and an output terminal connected to an input terminal of the second selection module 14; the signal sources of the first control signal C1 and the second control signal C2 may be an MCU (not shown), the enable signal WDA represents the operating state of the MCU, for example, when the MCU is normal, the WDA signal is high level, and when the MCU is not normal, the WDA signal is low level, and only when the WDA signal is high level, the first selection module 13 selects to transmit the first control signal C1 to the first switch module 15 so that the first control signal C1 may control the operation of the first switch module 15, and the second selection module 14 selects to transmit the second control signal C2 to the second switch module 16 so that the second control signal C2 may control the operation of the second switch module 16, so that the first switch module 15 and the second switch module 16 simultaneously establish a related path, and the high-voltage relay 10 operates, and the battery pack BAT supplies power to the entire system.
Therefore, the first signal input module 11 is configured to transmit a first control signal C1 to the first selection module 13 when the enable signal WDA is in a first state (i.e., high level); the first selection module 13 is configured to output the first control signal C1 to the first switch module 15 when the enable signal WDA is in a first state (i.e., high level), and output the delay control signal output by the delay shutdown module 17 to the first switch module 15 when the enable signal WDA changes from the first state (i.e., high level) to a second state (i.e., low level); the first switch module 15 is configured to establish, maintain or delay disconnection of a first path between the battery pack BAT and the high-voltage relay 10 under the control of the signal selectively output by the first selection module 13; the second signal input module 12 is configured to transmit a second control signal C2 to the second selection module 14 when the enable signal WDA is in a first state (i.e., high level); the second selection module 14 is configured to output the second control signal C2 to the second switch module 16 when the enable signal WDA is in a first state (i.e., high level), and output the delay control signal output by the delay shutdown module 17 to the second switch module 16 when the enable signal WDA changes from the first state (i.e., high level) to a second state (i.e., low level); the second switching module 16 is used for establishing, maintaining or delaying to open a second path between the high-voltage relay 10 and the ground under the control of the signal selectively output by the second selection module 14; the delay shutdown module 17 is configured to output a corresponding delay control signal to the first selection module 13 and the second selection module 14 when the enable signal WDA changes from the first state to the second state, so as to control the delay shutdown of the first path and the second path.
The delay turn-off module 17 is an RC delay turn-off module, and includes an energy storage capacitor Cap, a resistor Res, a capacitor charging branch 171 and a capacitor discharging branch 172; one end of the capacitor charging branch 171 is connected to one end of the capacitor discharging branch 172 and an upper electrode plate of the energy storage capacitor Cap, the other end of the capacitor charging branch 171 is connected to a power supply voltage (for example, 5V), and the operation of the capacitor charging branch 171 is controlled by an enable signal WAD, and is configured to charge the energy storage capacitor Cap through the power supply voltage when the enable signal WAD is in a first state, and stop charging the energy storage capacitor Cap when the enable signal WAD is in a second state; the other end of the capacitor discharging branch 172 is grounded, and the operation of the capacitor discharging branch 172 is also controlled by an enable signal WAD, and is used for discharging the energy storage capacitor Cap when the enable signal WAD is in the first state and the high-voltage relay 10 is in the power-off state; the energy storage capacitor Cap and the resistor Res are connected in parallel to form an RC delay branch 170, which is used for outputting a corresponding delay control signal to the first selection module 13 and the second selection module 14 after the enable signal WAD changes from the first state to the second state, so as to control the delay turn-off of the first path and the second path.
Referring to fig. 3, in an embodiment of the present invention, the capacitor charging branch 171 and the capacitor discharging branch 172 of the delay shutdown module 17 are two inverted MOS transistors or triodes (which may be connected to some expansion circuits), the first signal input module 11 and the second signal input module 12 may be two identical and gates, the first selection module 13 and the second selection module 14 may be two identical or gates, the first switch module 15 may include only the first MOS transistor or the first MOS transistor and some expansion circuits connected thereto, the second switch module 16 may include only the second MOS transistor or some expansion circuits connected thereto, the first MOS transistor and the second MOS transistor may be two identical NMOS transistors, the and gate used as the first signal input module 11 is defined as a first and gate, defining the and gate used as the second signal input block 12 as a second and gate, the or gate used as the first selection block 13 as a first or gate, the or gate used as the second selection block 14 as a second or gate, the first NMOS transistor used as the first switching block 15 as an S1 switch, the second NMOS transistor used as the second switching block 16 as an S2 switch, the MOS transistor or transistor used as the capacitor charging branch 171 as an S3 switch, and the MOS transistor or transistor used as the capacitor discharging branch 172 as an S4 switch; wherein, one input terminal of the first and gate receives the enable signal WDA, the other input terminal of the first and gate receives the first control signal C1, the output terminal of the first and gate is connected to one input terminal of the first or gate, one input terminal of the second and gate receives the enable signal WDA, the other input terminal of the second and gate receives the second control signal C2, the output terminal of the second and gate is connected to one input terminal of the second or gate, the other input terminal of the first or gate and the other input terminal of the second or gate are both connected to one end of a resistor Res (i.e. the output terminal of the time-delay shutdown module 17), the gate of the S1 switch is connected to the output terminal of the first or gate, the gate of the S2 switch is connected to the output terminal of the second or gate, the drain of the S1 switch is connected to the battery pack BAT, the source of the S1 switch is connected to a control edge (e.g. high edge) of the high-voltage relay 10, the drain of the S2 switch is connected to another control edge (e.g. the low edge) of the high voltage relay 10, the source of the S2 switch is connected, the gates of the S3 switch and the S4 switch are both connected to the enable signal WAD, the source (or drain) of the S3 switch is connected to the power supply voltage (e.g. 5V), the drain (or source) of the S3 switch is connected to the source (or drain) of the S4 switch, the drain (or source) of the S4 switch is grounded, the energy storage capacitor Cap and the resistor Res are connected in parallel to form one end of an RC delay branch 170 connected to the connection node of the S3 switch and the S4 switch and to the other input end of the first or gate and the other input end of the second or gate, respectively, the ground of the RC delay branch 170 (i.e. one end of the energy storage capacitor Cap and one end of the resistor Res are both grounded), the S3 switch provides a charging loop for the energy storage capacitor Cap, in order to satisfy the function of fast, the S4 switch is required to provide a discharge path for the energy storage capacitor Cap, and the control logic of the S3 switch and the S4 switch is associated with the enable WDA, e.g., S3 and S4 are normally conductive only when the enable signal WDA is high, and are otherwise always non-conductive.
The high-voltage relay control circuit of this embodiment can turn off the S1 switch and the S2 switch in a delayed manner when an MCU (controller) for providing the first control signal C1, the second control signal C2 and the enable signal WAD fails or an unpredictable failure occurs in a normal control logic of the high-voltage relay (i.e., the first control signal C1 and the second control signal C2 fail in unpredictable logics), so that the high-voltage relay 10 maintains a pull-in state, and a basic principle of the delayed turn-off is capacitive energy storage, and a principle of the high-voltage relay control circuit of this embodiment to implement the delayed turn-off is specifically as follows:
as shown in fig. 3, since the control states of the S1 switch and the S2 switch are determined by the states of the signals output by the first or gate (i.e., the first selection module 13) and the second or gate (i.e., the second selection module 14), and the input terminals of the first or gate (i.e., the first selection module 13) and the second or gate (i.e., the second selection module 14) have the first control signal C1 and the second control signal C2, and the delayed off signal (i.e., the voltage of the upper plate of the energy storage capacitor Cap) output by the RC delayed branch 170 formed by the energy storage capacitor Cap and the resistor Res of the delayed off module 17, during the reset process after the MCU fails, the charge energy stored in the energy storage capacitor Cap will be slowly consumed by the resistor Res, and the voltage at the input terminals of the first or gate and the second or gate will not be immediately 0V, so that the switches of the S1 and the S2 switch are turned off, and the time of the delayed off switch is reduced by the capacitance value C of the energy storage capacitor Cap, The resistance R of the resistor Res and the threshold level Vth of the first or gate (also the threshold level of the second or gate) are determined, and the specific formula of the current consumption of the energy storage capacitor Cap and the resistor Res is as follows:
the time-varying result of the voltage of the upper plate of the energy storage capacitor Cap (i.e. the voltages of the input ends of the first or gate and the second or gate) can be obtained according to the formula (1):
v in formula (2)(0)The upper pole of the energy storage capacitor Cap when the charge energy stored by the energy storage capacitor Cap begins to releaseThe initial voltage of the board, i.e. the supply voltage 5V in this embodiment.
According to the threshold level Vth of the first or gate, the time required for the voltage of the upper plate of the energy storage capacitor Cap to drop to Vth, that is, the time from the MCU failure to the high voltage relay 10 closing, can be obtained:
it can be known from the formula (3) that increasing the resistance R of the resistor Res and the capacitance C of the energy storage capacitor Cap can prolong the actuation time of the high-voltage relay 10 after the MCU fault occurs, i.e. increase the time of delayed turn-off, and in any case, it is desirable to complete the MCU reset within the delayed turn-off time as soon as possible to recover the MCU control on the high-voltage relay as soon as possible, so the final delayed turn-off time needs to be determined by the time required for the MCU to fail, reset, and recover the high-voltage relay control.
Based on the above time delay turn-off principle, the working flow of the high-voltage relay control circuit of the embodiment under the condition that the MCU has a fault is as follows:
1.1) normally powering on, the MCU generates a first control signal C1 and a second control signal C2, the enable signal WAD is in a high level (namely, a first state), the first control signal C1 is transmitted to the S1 switch through the first AND gate and the first OR gate, the second control signal C2 is transmitted to the S2 switch through the second AND gate and the second OR gate, the S1 switch and the S2 switch are simultaneously switched on, and the high-voltage relay 10 is pulled in;
1.2) the enable signal WAD is in a high level (namely, a first state), the S3 switch is turned on, the S4 switch is turned off, and 5V power supply voltage is stored for the energy storage capacitor Cap through the S3 switch so as to provide energy required by subsequent time delay;
1.3) the MCU malfunctions, the enable signal WAD goes low (i.e., to the second state), the first control signal C1 and the second control signal C2 are indeterminable, and the first and second and gates cannot output the first control signal C1 and the second control signal C2 to the first and second or gates;
1.4) when the enable signal WAD changes to low level, the S3 switch and the S4 switch are both in an off state, and the energy storage capacitor Cap is not charged any more;
1.5) the energy stored in the step 1.2) on the energy storage capacitor Cap is slowly released through a resistor Res connected in parallel with the energy storage capacitor Cap, in the process, the MCU resets, and before the voltage of the upper plate of the energy storage capacitor Cap is greater than the threshold level Vth of the first OR gate and the second OR gate, the high-voltage relay 10 can be kept closed all the time, therefore, the high-voltage relay 10 can be kept in the pull-in state all the time in the reset process of the MCU by controlling the time (namely the delay turn-off time) when the voltage of the upper plate of the energy storage capacitor Cap is reduced to Vth, and the first control signal C1 and the second control signal C2 output after the MCU is successfully reset can continue to effectively control the high-voltage relay 10.
Fig. 4 and 5 are signal diagrams respectively illustrating how the MCU can be successfully reset and how the MCU fails to reset when the high-voltage relay control circuit of this embodiment is turned off with a delay, where "successful reset" indicates that the MCU can perform a reset operation within the time period of the delay turn-off, and can output normal C1, C2, and WAD signals after the reset is completed, so as to resume the control of the high-voltage relay, and "failed reset" indicates that the MCU can perform a reset operation within the time period of the delay turn-off, but cannot output normal C1, C2, and WAD signals, and cannot resume the control of the high-voltage relay. Referring to fig. 4, when the MCU fails, the MCU can successfully reset within the delay off time of the high-voltage relay control circuit of this embodiment to resume working, so that the state of the high-voltage relay can be maintained in the pull-in state without disengagement; referring to fig. 5, when the MCU fails, the MCU resets within the time delay off time of the high-voltage relay control circuit of this embodiment, but cannot resume working again, so the high-voltage relay is still disconnected after a period of time delay (i.e., the time delay off time), thereby ensuring that the high-voltage power supply of the system is disconnected after the MCU cannot resume normal working.
In addition, if the MCU has no fault, the high-voltage relay control circuit of this embodiment needs to control the high-voltage relay 10 to normally power down, and the specific working flow is as follows:
2.1) normally powering on, the MCU generates a first control signal C1 and a second control signal C2, the enable signal WAD is in a high level (namely, a first state), the first control signal C1 is transmitted to the S1 switch through the first AND gate and the first OR gate, the second control signal C2 is transmitted to the S2 switch through the second AND gate and the second OR gate, the S1 switch and the S2 switch are simultaneously switched on, and the high-voltage relay 10 is pulled in;
2.2) the S3 switch is turned on, the S4 switch is turned off, and 5V power supply voltage is stored for the energy storage capacitor Cap through the S3 switch so as to provide energy of subsequent required time delay;
2.3) normally requesting the high-voltage relay 10 to be powered off when the MCU fails;
2.4) the S3 switch is turned off, the S4 switch is turned on, and the energy storage capacitor Cap is rapidly discharged;
2.5) the first control signal C1 is transmitted to the S1 switch through the first AND gate and the first OR gate, and the second control signal C2 is transmitted to the S2 switch through the second AND gate and the second OR gate, so that the high-voltage relay 10 is normally powered off, namely is not pulled in any more.
In the high-voltage relay control circuit, the first signal input module 11, the second signal input module 12, the first switch module 15 and the second switch module 16 form a normal control circuit, and the logic between the delay turn-off module 17 and the normal control circuit needs to be used or is used to satisfy the control of the high-voltage relay when the MCU normally works and fails.
For example, in another embodiment of the present invention, the or logic may be implemented by replacing the and gates in the first selection module 13 and the second selection module 14 of the high-voltage relay control circuit shown in fig. 3 with diode circuits, where the Vth threshold in the calculation of the delayed off time of the high-voltage relay control circuit is determined by the driving MOS transistors of the high-voltage relay, specifically, referring to fig. 6, the first selection module 13 includes diodes D1 and D2, the anode of the diode D1 is connected to the output terminal of the first signal input module 11 (i.e., the output terminal of the first and gate in fig. 3), the anode of the diode D2 is connected to the output terminal of the delayed off module 17 (i.e., one terminal of the resistor Res in fig. 3), the cathode of the diode D1 and the cathode of the diode D2 are commonly connected to the input terminal of the first switch module 15 (i.e., the gate of the S1 switch), and the second selection module 14 includes diodes D3, d4, the anode of the diode D3 is connected to the output terminal of the second signal input module 12 (i.e., the output terminal of the first and gate in fig. 3), the anode of the diode D4 is connected to the output terminal of the delay-off module 17 (i.e., the terminal of the resistor Res in fig. 3), the cathode of the diode D3 and the cathode of the diode D4 are commonly connected to the input terminal of the second switching module 16 (i.e., the gate of the S2 switch), this embodiment also enables the switches S1 and S2 to remain in a conductive state for a period of time after the WDA signal changes from high to low (e.g., a malfunction of the MCU or an unpredictable failure of the normal control logic of C1 and C2 for controlling the high voltage relays), therefore, the high-voltage relay can still keep a suction state in the reset process of the MCU, the accidental interruption of the high-voltage relay is avoided, the arc discharge phenomenon of the high-voltage relay is avoided, and the risk of damage of the high-voltage relay is reduced.
For another example, in other embodiments of the present invention, the and gates in the first signal input module 11 and the second signal input module 12 may also be replaced by nand gates, specifically, the nand gate of the first signal input module is defined as a first nand gate, one input end of the first nand gate receives the enable signal WAD, the other input end of the first nand gate receives the first control signal C1, and an output end of the first nand gate is connected to the first selection module 13; the nand gate of the second signal input module 12 is defined as a second nand gate, one input end of the second nand gate receives the enable signal WAD, the other input end of the second nand gate receives the second control signal C2, and an output end of the second nand gate is connected to the second selection module 14, where the first control signal C1 and the second control signal C2 in this embodiment are inverse to the first control signal C1 and the second control signal C2 in the above embodiment, which can also achieve the effects of the above embodiment.
In summary, in the high-voltage relay control circuit of the present invention, when the enable signal is in the first state, the first control signal may be sequentially transmitted to one side of the high-voltage relay through the first signal input module, the first selection module and the first switch module, and the second control signal may be sequentially transmitted to the other side of the high-voltage relay through the second signal input module, the second selection module and the second switch module, so as to pull in the high-voltage relay, when the enable signal is changed from the first state to the second state, the control signal may be continuously transmitted to the two sides of the high-voltage relay through the first selection module, the first switch module, the second selection module and the second switch module by the delay-off module, so as to delay the pull-in time of the high-voltage relay, so that when a controller (MCU) providing the first control signal and the second control signal fails or when a normal control logic of the high-voltage relay fails unpredictably, the high-voltage relay is guaranteed to be kept in actuation in the period of reset recovery of a controller (MCU) and the like, so that accidental interruption of the high-voltage relay is avoided, the high-voltage relay is prevented from arcing, and the risk of damage of the high-voltage relay is reduced.
Referring to fig. 7, the present invention further provides a battery management system, which includes a high voltage relay control circuit 1, a controller 2, a battery pack BAT and a high voltage relay 10. The high-voltage relay control circuit 1 is a high-voltage relay control circuit of the present invention, that is, it includes a first signal input module 11, a second signal input module 12, a first selection module 13, a second selection module 14, a first switch module 15, a second switch module 16 and a delay turn-off module 17 shown in fig. 2, the controller 2 is connected with the signal input ends of the first signal input module 11, the second signal input module 12 and the delay cut-off module 17, for providing the first control signal C1 and the enable signal WAD to the first signal input block 11, the second control signal C2 and the enable signal WAD to the second signal input block 12, the enable signal WAD to the delay-off block 17, the battery pack BAT is connected to a first switch module 15 of the high-voltage relay control circuit 1, the high-voltage relay 10 is connected to the first switch module 15 and the second switch module 16 of the high-voltage relay control circuit 1, respectively. On one hand, the high-voltage relay control circuit 1 can control the high-voltage relay 10 to be attracted when the controller 2 works normally, so that the battery pack BAT supplies power to the whole system, and can also control the high-voltage relay 10 to be powered off normally, so that the system is powered off normally and the like; on the other hand, when the controller 2 has a fault or the normal control logic of the controller fails unpredictably, a delay turn-off function can be generated, so that the high-voltage relay 10 keeps attracting within a delay turn-off time period, after the controller 2 is successfully reset and works again, the normal control circuit of the high-voltage relay control circuit 1 can continuously control the high-voltage relay 10 to attract or normally power off, or when the controller 2 fails to reset and cannot work again, the high-voltage relay still disengages after the delay turn-off time, and the high-voltage power supply of the system is ensured to be disconnected.
The battery management system adopts the high-voltage relay control circuit, and can generate a function of delayed turn-off when the controller fails and the normal control logic fails, so that the accidental interruption of the high-voltage relay can be avoided, the arc discharge phenomenon of the high-voltage relay is avoided, the risk of damage of the high-voltage relay is reduced, the use safety is enhanced, and the service life of the high-voltage relay is prolonged.
The invention also provides an electronic device comprising the battery management system. The electronic device can be an electric automobile, and the electric automobile adopting the battery management system can avoid the problem of accidental interruption of the high-voltage relay when the controller fails and the normal control logic fails through the high-voltage relay control circuit, so that the safety and the dynamic performance of the electronic device can be obviously improved.
It will be apparent to those skilled in the art that various changes and modifications may be made in the invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A high voltage relay control circuit, comprising:
the first signal input module is used for transmitting a first control signal to the first selection module when an enable signal is in a first state, and the first switch module is also connected with a battery pack and a high-voltage relay and used for establishing, maintaining or delaying to turn off a first passage between the battery pack and the high-voltage relay under the control of the signal output by the first selection module;
the second signal input module is used for transmitting a second control signal to the second selection module when the enable signal is in a first state, and the second switch module is also connected with the high-voltage relay and the ground and used for establishing, maintaining or delaying to turn off a second path between the high-voltage relay and the ground under the control of the signal output by the second selection module;
the delay turn-off module is connected with the first selection module and the second selection module, and is used for outputting corresponding delay control signals to the first selection module and the second selection module when the enable signal is changed from the first state to the second state so as to control the delay turn-off of the first path and the second path, and the delay turn-off module comprises an energy storage capacitor, a resistor, a capacitor charging branch and a capacitor discharging branch; one end of the capacitor charging branch circuit is connected with one end of the capacitor discharging branch circuit and the upper pole plate of the energy storage capacitor, and the other end of the capacitor charging branch circuit is connected with a power supply voltage and used for charging the energy storage capacitor through the power supply voltage when the enabling signal is in a first state and stopping charging the energy storage capacitor when the enabling signal is in a second state; the other end of the capacitor discharging branch circuit is grounded and used for discharging the energy storage capacitor when the enabling signal is in a first state and the high-voltage relay is in a power-off state; the energy storage capacitor and the resistor are connected in parallel to form an RC delay branch circuit, and the RC delay branch circuit is used for outputting corresponding delay control signals to the first selection module and the second selection module after the enabling signals are changed from the first state to the second state so as to control the delay turn-off of the first access and the second access.
2. The high voltage relay control circuit of claim 1, wherein the capacitor charging branch and the capacitor discharging branch comprise two inverted MOS transistors or a transistor connected together.
3. The high-voltage relay control circuit as claimed in claim 1, wherein the first signal input module comprises a first and gate or a first nand gate, one input terminal of the first and gate or the first nand gate receives the enable signal, the other input terminal of the first and gate or the first nand gate receives the first control signal, and an output terminal of the first and gate or the first nand gate is connected to the first selection module.
4. The high-voltage relay control circuit as claimed in claim 1, wherein the second signal input module comprises a second and gate or a second nand gate, one input terminal of the second and gate or the second nand gate receives the enable signal, the other input terminal of the second and gate or the second nand gate receives the second control signal, and an output terminal of the second and gate or the second nand gate is connected to the second selection module.
5. The high-voltage relay control circuit according to any one of claims 1 to 4, wherein the first selection module comprises a first OR gate or two first diodes, one input terminal of the first OR gate is connected to the first signal input module, the other input terminal of the first OR gate is connected to the time-delay turn-off module, and the output terminal of the first OR gate is connected to the first switch module; one of the two first diodes is connected between the first signal input module and the first switch module, and the other first diode is connected between the time delay turn-off module and the first switch module.
6. The high-voltage relay control circuit according to any one of claims 1 to 4, wherein the second selection module comprises a second OR gate or two second diodes, one input end of the second OR gate is connected to the second signal input module, the other input end of the second OR gate is connected to the time-delay turn-off module, and the output end of the second OR gate is connected to the second switch module; one of the two second diodes is connected between the second signal input module and the second switch module, and the other second diode is connected between the delay turn-off module and the second switch module.
7. The high-voltage relay control circuit according to claim 1, wherein the first switching module comprises a first MOS transistor having a gate connected to the first selection module, and/or wherein the second switching module comprises a second MOS transistor having a gate connected to the second selection module.
8. A battery management system comprising a controller, a battery pack, a high voltage relay, and the high voltage relay control circuit of any one of claims 1 to 7, wherein the controller is configured to provide the first control signal, the second control signal, and the enable signal to the high voltage relay control circuit, the battery pack is connected to the first switch module of the high voltage relay control circuit, and the high voltage relay is connected to the first switch module and the second switch module of the high voltage relay control circuit, respectively.
9. An electronic device characterized by comprising the battery management system of claim 8.
10. The electronic device of claim 9, wherein the electronic device is an electric vehicle.
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| CN110970961B (en) * | 2018-12-06 | 2021-06-08 | 宁德时代新能源科技股份有限公司 | Power consumption protection circuit |
| CN113715685B (en) * | 2020-05-22 | 2023-05-19 | 比亚迪股份有限公司 | Circuit for controlling actuation state of high-voltage switch, method and management system thereof and vehicle |
| CN113746462B (en) * | 2020-05-29 | 2024-04-05 | 宁德时代新能源科技股份有限公司 | Driving circuit |
| CN112509864A (en) * | 2020-11-06 | 2021-03-16 | 联创汽车电子有限公司 | Relay control method and control structure thereof |
| KR20220130516A (en) * | 2021-03-18 | 2022-09-27 | 주식회사 엘지에너지솔루션 | Relay control apparatus, battery pack and electric vehicle |
| CN113212247A (en) * | 2021-06-18 | 2021-08-06 | 中国第一汽车股份有限公司 | Management system and new energy automobile of power battery package |
| CN114204809B (en) * | 2021-11-18 | 2023-10-20 | 华人运通(江苏)技术有限公司 | Control device of power output circuit and power supply system |
| CN114211963B (en) * | 2021-12-14 | 2023-10-17 | 华人运通(江苏)技术有限公司 | Relay control device, battery management system and electric automobile |
| CN117080018B (en) * | 2023-09-27 | 2024-01-19 | 德力西电气有限公司 | Contactor coil control system |
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| CN203838502U (en) * | 2013-12-27 | 2014-09-17 | 深圳市航盛电子股份有限公司 | Relay control system of automobile IGN power supply |
| KR20160016721A (en) * | 2014-08-05 | 2016-02-15 | 타이코 일렉트로닉스 (상하이) 컴퍼니 리미티드 | Contactor, contactor assembly and control circuit |
| CN204936858U (en) * | 2015-07-21 | 2016-01-06 | 北京波士顿动力电池有限公司 | A kind of electronlmobil relay safety control circuit |
| TWI642077B (en) * | 2015-09-24 | 2018-11-21 | 仁寶電腦工業股份有限公司 | Control apparatus for relay and controlling method thereof |
| CN106877277B (en) * | 2015-12-14 | 2019-07-23 | 北京宝沃汽车有限公司 | A kind of control relay circuit, vehicle control electronics and vehicle |
| WO2017102025A1 (en) * | 2015-12-18 | 2017-06-22 | Pepperl+Fuchs Gmbh | Methods and apparatuses for monitoring the functionality of redundantly interconnected contacts |
| CN105490255B (en) * | 2016-01-11 | 2017-10-27 | 福建省汽车工业集团云度新能源汽车股份有限公司 | A kind of linkage protection of BMS flash driving and warning circuit |
| CN106274496B (en) * | 2016-10-09 | 2019-03-26 | 东莞钜威动力技术有限公司 | A kind of electric car actuator control system |
| CN107919250A (en) * | 2016-10-11 | 2018-04-17 | 黄石先达电气有限公司 | A kind of gating pulse A.C. contactor, which starts, remains on circuit |
| CN206742153U (en) * | 2017-06-02 | 2017-12-12 | 广州市勤思网络科技有限公司 | A kind of controllable time delay restarts circuit |
| CN107993892B (en) * | 2017-12-28 | 2024-02-06 | 北京中车赛德铁道电气科技有限公司 | Power supply control circuit suitable for electric locomotive contactor |
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