CN112216558B - Relay driving circuit and electrical system - Google Patents
Relay driving circuit and electrical system Download PDFInfo
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- CN112216558B CN112216558B CN201910631604.9A CN201910631604A CN112216558B CN 112216558 B CN112216558 B CN 112216558B CN 201910631604 A CN201910631604 A CN 201910631604A CN 112216558 B CN112216558 B CN 112216558B
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- 238000003745 diagnosis Methods 0.000 claims description 33
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Classifications
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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
- H01H47/22—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for supplying energising current for relay coil
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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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Abstract
The invention provides a relay driving circuit and an electrical system, wherein the relay driving circuit comprises a power supply module, a control module, a high-side driving module and a low-side driving module, and the high-side driving module and the low-side driving module are connected in series and respectively controlled by the control module, so that the mode of serial driving of the high side and the low side of a relay is realized, and the problem of misoperation of the relay caused when the output end of the traditional single-side relay driving circuit driven by a single high-side switch or a single-side switch has a short circuit or an open circuit fault can be avoided.
Description
Technical Field
The invention relates to the technical field of electric automobile control, in particular to a relay driving circuit and an electric system.
Background
The relay is an automatic switching element with an isolation function, and is widely applied to remote control, remote sensing, communication, automatic control, electromechanical integration and power electronic equipment, and is one of the most important control elements. For example, with the development of automobile energy toward new energy, an electric automobile gradually becomes an important direction of automobile technology development, in the electric automobile, the energy source of the automobile mainly comes from a battery pack, and the power supply of high-voltage parts of the whole automobile is realized by connecting the battery pack with a high-voltage load through a high-voltage relay as high-voltage connecting equipment; in the existing battery system, the battery pack realizes power supply to the high-voltage load through single-side control of the high-voltage relay, specifically, the high-voltage relay is used as an important component of the new energy automobile and is mainly used as a main positive relay and a main auxiliary relay of the battery pack, a positive relay and an auxiliary relay of a charging loop, a pre-charging relay for controlling pre-charging and the like, and the functions and the safety performance of the battery pack need to meet strict requirements.
The current main relay driving circuit uses a single high-side switch or low-side switch to drive, that is, the current relay driving circuit is usually a single-side relay driving circuit, and in such a single-side driving circuit structure, when the output end (i.e., a high-side output pin) of the high-side switch is short-circuited to a power supply or the output end (i.e., a low-side output pin) of the low-side switch is short-circuited to a ground fault, the malfunction of the high-voltage relay is easy to be caused. In addition, when the single-side driving circuit is applied to driving a high-voltage relay in an automobile, the faults that the output end of a high-side switch is short-circuited to a power supply, the output end of a low-side switch is short-circuited to the ground and the output end of the high-side switch or the low-side switch is open-circuited are not considered, and the diagnosis requirement of an automobile controller cannot be met. In addition, in the use process, the protection of an internal circuit and a load of an automobile controller under the condition of normal disconnection moment and fault is not considered in the current single-side drive circuit, and the single-side drive circuit is easy to fail under long-term working.
Disclosure of Invention
The invention aims to provide a novel relay driving circuit and an electrical system, so as to solve the problem that the relay malfunction is caused when the output end of the traditional single-side relay driving circuit is in short circuit or open circuit fault.
In order to solve the technical problems, the invention provides a relay driving circuit which is connected with a positive end and a negative end of a control coil of a relay and used for driving the relay to be attracted or disconnected, wherein the relay driving circuit comprises a power module, a control module, a high-side driving module and a low-side driving module which are respectively connected with the power module,
the control module is also connected with the high-side driving module and the low-side driving module and is used for providing a first control signal for the high-side driving module and a second control signal for the low-side driving module;
the high-side driving module is characterized in that one input end of the high-side driving module is connected with the control module, the other input end of the high-side driving module is connected with the power module, the output end of the high-side driving module is connected with the positive end of a control coil of the relay and is used for providing the voltage obtained from the power module for the relay under the control of a first control signal provided by the control module so as to drive the relay to be attracted or disconnected; the method comprises the steps of,
the low-side driving module is connected in series with the high-side driving module, one input end of the low-side driving module is connected with the control module, the output end of the low-side driving module is connected with the negative end of the control coil of the relay, and the low-side driving module is used for directly outputting the voltage of the power module to supply power to the relay under the control of a second control signal provided by the control module so as to drive the relay to be attracted or disconnected, or the channel between the low-side driving module and the negative end of the control coil of the relay is conducted or closed with set frequency and duty ratio so as to adjust and drive the equivalent voltage of the control coil of the relay to drive the relay to be attracted or disconnected.
Optionally, the high-side driving module includes: the control end of the high-side driving switch circuit is used as one input end of the high-side driving module, is connected with one end of the control module, one end of a switch path of the high-side driving switch circuit is used as the other input end of the high-side driving module, is connected with one end of the power supply module and one end of the low-side driving module, and the other end of the switch path of the high-side driving switch circuit is used as the output end of the high-side driving module and is connected with the positive end of a control coil of the relay; and the output end of the clamping circuit is connected with the other end of the switching path of the high-side driving switching circuit and the positive end of the control coil of the relay, the input end of the clamping circuit is grounded and connected with the other end of the low-side driving module, and the clamping circuit is used for clamping the induced electromotive force on the control coil of the relay on a fixed voltage at the moment of disconnection of the relay so as to improve the disconnection speed of the relay.
Optionally, the high-side driving switch circuit includes a high-side MOS tube with protection functions of overcurrent limiting and overtemperature turn-off, where the MOS tube is used to limit the current flowing through the output end of the high-side driving module to a fixed value when the output end of the high-side driving module has a short circuit fault, and automatically turn off when the temperature exceeds a set overtemperature threshold.
Optionally, the low-side driving module includes: the control end of the low-side driving switch circuit is used as one input end of the low-side driving module and is connected with the other end of the control module, one end of a switch path of the low-side driving switch circuit is used as the other input end of the low-side driving module and is grounded and is simultaneously connected with one end of the high-side driving module, and the other end of the switch path of the low-side driving switch circuit is used as the output end of the low-side driving module and is connected with the negative end of the control coil of the relay; and the input end of the follow current circuit is connected with one end of a switching path of the low-side driving switching circuit and the negative end of the control coil of the relay, the output end of the follow current circuit is connected with one end of the high-side driving module connected with the power supply module, and the follow current circuit is used for providing a follow current channel for the control coil of the relay in the stage that the low-side driving switching circuit is closed at the set frequency and the set duty ratio so as to ensure that the relay keeps a closed state.
Optionally, the low-side driving switch circuit includes a MOS tube having protection functions of overcurrent limiting and overtemperature shutdown, where the MOS tube is configured to limit a current flowing through an output end of the low-side driving module to a fixed value when a short circuit fault occurs at the output end of the low-side driving module, and automatically shutdown when a temperature exceeds a set overtemperature threshold.
Optionally, the first control signal is an on/off signal that directly controls a switching element in the high-side driving module to be on or off; the second control signal includes an on/off signal that directly controls a switching element in the low-side driving module to be on or off, and a PWM signal having the set frequency and duty ratio.
Optionally, the control module is configured to provide the on/off signal or the PWM signal to the low-side driving module as the second control signal according to a specific driving requirement and a driving condition of the relay.
Optionally, when the driving requirement requires that the voltage of the power supply module directly supplies power to the relay and the voltage of the power supply module is within an input voltage range allowed by a control coil of the relay, the control module outputs the on/off signal as the second control signal to be provided to the low-side driving module; when the driving requirement requires voltage transformation to drive the relay or the voltage of the power supply module is higher than the maximum input voltage allowed by the control coil of the relay, the control module outputs the PWM signal as the second control signal to be provided for the low-side driving module.
Optionally, the control module is further configured to control the outputs of the high-side driving module and the low-side driving module when a single-point fault occurs on the circuit between the output end of the high-side driving module or the output end of the low-side driving module and the control coil under the working condition that the relay is disconnected, so that a voltage difference between the positive end and the negative end of the control coil of the relay is 0.
Optionally, the relay driving circuit further includes a diagnosis module, one sampling end of the diagnosis module is connected with the positive end of the control coil of the relay, the other sampling end of the diagnosis module is connected with the negative end of the control coil of the relay, the output end of the diagnosis module is connected with the control module, and the diagnosis module is used for monitoring the positive end and the negative end of the control coil of the relay and transmitting the monitored data back to the control module, so that the control module judges whether the relay has a fault according to the monitored data.
Optionally, the diagnostic module includes: the high-side diagnosis circuit is used for monitoring the positive end of the control coil of the relay and transmitting the monitored data back to the control module so that the control module judges whether the positive end of the relay and the high-side driving module connected with the positive end are in fault or not according to the monitored data; and one end of the low-side diagnosis circuit is used as a sampling end of the diagnosis module and is connected with the negative end of the control coil of the relay, the other end of the low-side diagnosis circuit is used as an output end of the diagnosis module and is connected with the control module, the low-side diagnosis circuit is used for monitoring the negative end of the control coil of the relay and transmitting monitored data back to the control module, and whether the negative end of the relay and the low-side driving module connected with the negative end are in fault or not is judged by the control module according to the monitored data.
Optionally, the fault includes at least one of a positive end of the control coil of the relay being shorted to a power source, a negative end of the control coil of the relay being shorted to ground, a positive end of the control coil of the relay being open circuit, and a negative end of the control coil of the relay being open circuit.
Optionally, the first control signal is an on/off signal that directly controls the switching element in the high-side driving module to be on or off, and the second control signal is an on/off signal that directly controls the switching element in the low-side driving module to be on or off, when the high-side diagnostic circuit samples the voltage of the output end of the high-side driving module or the voltage of the positive end of the control coil of the relay, the low-side diagnostic circuit samples the voltage of the output end of the low-side driving module or the voltage of the negative end of the control coil of the relay; when the first control signal is an on/off signal for directly controlling a switching element in the high-side driving module to be on or off, and the second control signal is a PWM signal having the set frequency and duty ratio, the high-side diagnostic circuit samples a voltage of an output terminal of the high-side driving module or a voltage of a positive terminal of a control coil of the relay, and the low-side diagnostic circuit samples a frequency and duty ratio of an output signal of an output terminal of the low-side driving module.
Optionally, the power module includes: the driving output power supply module is connected with the high-side driving module and the low-side driving module and is used for providing driving power for the high-side driving module and the low-side driving module; and the internal circuit power supply module is connected with the control module and the diagnosis module and is used for providing an internal circuit power supply for the control module and the diagnosis module.
Based on the same inventive concept, the invention also provides an electrical system, which comprises at least one relay and a relay driving circuit connected with the relay, wherein the relay driving circuit is connected with the positive end and the negative end of a control coil of the relay and used for driving the relay to be closed or opened.
Optionally, the electric system is a charging pile, a vehicle body controller, an electric vehicle battery management system, a remote control device, a telemetry device, a wireless communication device, a pure electric vehicle or a hybrid electric vehicle, and when the electric system is an electric vehicle battery management system, a pure electric vehicle or a hybrid electric vehicle, the input end of the power module is connected with the vehicle-mounted storage battery.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
1. The high-side driving module and the low-side driving module are connected in series and controlled by the control module respectively, so that a high-side and low-side serial driving mode of the relay can be realized, and the problem that the relay malfunction is caused when the output end of the traditional single-side relay driving circuit driven by a single high-side switch or a single-side switch is short-circuited or open-circuited can be avoided.
2. Further, the second control signal comprises an on/off signal and a PWM signal, so that the relay driving circuit can be compatible with two driving modes of on/off and PWM, and the driving requirement of a main high-voltage relay in the market is met.
3. Further, the equivalent voltage of the control coil for driving the relay can be adjusted in a PWM driving mode (namely, the equivalent output voltage of the low-side driving module is changed), and then the normal driving of the relay can be kept under the working condition that the voltage of the power supply module is higher than the maximum input voltage allowed by the control coil of the relay (such as the working condition of line crossing starting), so that the relay is prevented from being damaged.
4. Further, the clamping circuit is arranged in the high-side driving module, so that the high-side driving module and the low-side driving module can be connected in series, the relay can be ensured to be rapidly turned off at the moment of switching off the relay, and meanwhile, the internal circuit structure of the relay driving circuit is protected from being damaged due to overlarge induced electromotive force in the control coil of the relay.
5. Further, the high-side driving module and/or the low-side driving module comprises an MOS tube with overcurrent limiting and over-temperature shutoff functions, so that when the output end of the high-side driving module or the low-side driving module fails, the internal circuit of the relay driving circuit, the relay and the external load connected with the relay driving circuit are protected from being damaged due to overlarge current and overhigh temperature.
6. Further, the relay driving circuit further comprises a diagnosis module, so that fault diagnosis of short circuit of the output end of the high-side driving module to a power supply, short circuit of the output end of the low-side driving module to ground and open circuit of the output end of the high-side driving module and open circuit of the output end of the low-side driving module can be realized, and the diagnosis requirements of electric systems (or electric products) such as an automobile controller and the like are met.
Drawings
FIG. 1 is a schematic diagram of a system configuration of a relay driving circuit according to an embodiment of the present invention;
FIG. 2 is a schematic circuit diagram of a high side driving module and a low side driving module according to an embodiment of the present invention;
FIG. 3 is a schematic circuit diagram of a diagnostic module according to an embodiment of the invention;
the figure shows: 1-a power module; 11-a drive output power module; 12-an internal circuit power module; 2-a control module; 21-a microcontroller; 22-peripheral circuitry; 3-high side drive module; 31-high side drive switching circuit; a 32-clamp circuit; 4-a low side drive module; 41-a low side drive switching circuit; 42-a freewheel circuit; a 5-diagnostic module; 51-high side diagnostic circuitry; 52-a low-side diagnostic circuit; 511-high-side diagnostic network; 521 low-side diagnostic network; 512-high side voltage bias circuit; 522-a low side voltage bias circuit; 6-a control coil of the relay; 61-positive terminal of control coil; 62 negative terminal of control coil; p1-high side output pins; p2-low side output pin.
Detailed Description
The relay driving circuit according to the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. Advantages and features of the invention will become more apparent from the following description and from the claims. It should be noted that the drawings are in a very simplified form and are all to a non-precise scale, merely for convenience and clarity in aiding in the description of embodiments of the invention.
The invention provides a relay driving circuit, which aims to solve the problem that relay misoperation is easy to occur when the output pin (namely the output end) of the traditional unilateral driving circuit is short-circuited to a power supply or short-circuited to ground.
Referring to fig. 1, an embodiment of the present invention provides a relay driving circuit connected to a positive terminal 61 and a negative terminal 62 of a control coil 6 of a relay for driving the relay (not shown) to be turned on or off. The relay driving circuit of the present embodiment includes a power supply module 1, a control module 2, a high-side driving module 3, a low-side driving module 4, and a diagnostic module 5. The power module 1 is respectively connected with the control module 2, the high-side driving module 3 and the diagnosis module 5 to supply power to the control module 2, the high-side driving module 3 and the diagnosis module 5, the control module 2 is also respectively connected with the high-side driving module 3, the low-side driving module 4 and the diagnosis module 5, and the high-side driving module 3 and the low-side driving module 4 are also mutually connected in series. The relay is energized when there is a voltage difference between the positive terminal 61 and the negative terminal 62 that is not equal to 0, and the control coil 6 of the relay is turned off when the voltage difference between the positive terminal 61 and the negative terminal 62 is equal to 0.
When the relay driving circuit of the embodiment is applied to an automobile, the input end of the power module 1 may be connected to an on-vehicle battery module.
With continued reference to fig. 1, in this embodiment, the power module 1 includes a driving output power supply module 11 and an internal circuit power supply module 12. The driving output power supply 11 processes the power received by the power supply module 1 and outputs the processed power to the high-side driving module 2, and the processed power is used as a driving power UB of the high-side driving module 2 driving relay, and the driving power UB is supplied to the low-side driving module 4 through the high-side driving module 2. The drive output power module 11 has the necessary power line protection devices including, but not limited to, anti-reverse diodes, transient voltage suppression diodes, filter capacitors, etc. The internal circuit power supply module 12 provides an internal circuit power supply (which may also be referred to as an operating voltage, for example, 5V or 3.3V) to the control module 2 and the diagnostic module 5, and typically includes a power regulation device such as a DC-DC voltage conversion circuit or a linear regulator (LDO) conversion circuit. As an example, the driving output power supply module 11 has not only a ceramic capacitor, TVS tube, and the like structure for ESD and power line interference protection, but also an electrolytic capacitor for filtering voltage stabilization, and further has a PMOS anti-reverse circuit for realizing an external power supply (e.g., a battery) for preventing the input terminal of the power supply module 1 from being connected in reverse, whereby the driving output power supply module 11 can realize safety protection of the relay driving power supply. As an example, the internal circuit power supply module 12 has a voltage conversion circuit such as a DC/DC circuit or an LDO circuit, and converts the voltage received at the input terminal of the power supply module 1 into an operating voltage required for the internal circuits of the control module 2 and the diagnostic module 5 by the voltage conversion circuit.
In this embodiment, the driving power UB terminal is the positive electrode of the power source output by the driving output power supply module 11, the ground GND is the negative electrode of the power source output by the driving output power supply module 11, and at this time, it can be considered that one end of the low-side driving module 4 is directly connected to one output terminal of the driving output power supply module 11, and the driving output power supply module 11 directly supplies power to the low-side driving module 4.
With continued reference to fig. 1, the control module 2 includes a microcontroller 21 and a peripheral circuit 22, where the microcontroller 21 connects the high-side driving module 3 and the low-side driving module 4 through corresponding general purpose input/output (GPIO) interfaces to provide corresponding control signals to the high-side driving module 3 and the low-side driving module 4 to control on and off of corresponding switching elements (e.g., MOS transistors) in the high-side driving module 3 and the low-side driving module 4, so as to drive the relay to be turned on or off. The microcontroller 21 generates a first control signal and a second control signal according to specific relay driving requirements and driving conditions, wherein the first control signal is provided to the high-side driving module 3 through a first GPIO interface (not shown), and the second control signal is provided to the low-side driving module 4 through a second GPIO interface (not shown). Wherein the first control signal is an On/off signal (defined as On/off signal) that directly controls the switching elements in the high-side driving module 3 to be On or off; the second control signal includes an On/off signal that directly controls the switching element in the low-side driving module to be On or off and a PWM signal (i.e., a pulse width modulation signal) having the set frequency and duty ratio, whereby the first control signal may control the switching element in the high-side driving module 3 to operate in On/off form and the second control signal may control the switching element in the low-side driving module 4 to operate in PWM form. The two driving output modes of the On/off mode and the PWM mode can meet the driving requirements of different high-voltage relays, wherein when the microcontroller 21 outputs a second control signal of the On/off mode, a switching element in the low-side driving module 4 is normally conducted, and the voltage of the power supply module 1 (namely, the voltage of an external power supply connected with the input end of the power supply module 1) is directly output to the control coil 6 of the relay so as to drive the relay to work; when the microcontroller 21 outputs the second control signal in PWM form, the switching elements in the low-side driving module 4 are turned on and off at a set frequency and duty ratio, and the equivalent voltage of the control coil 6 of the driving relay can be conveniently adjusted. The low-voltage MOS tube is controlled to work in an On/off mode or a PWM mode according to specific high-voltage relay driving requirements and driving conditions. The peripheral circuit 22 may include functional circuits for realizing signal transmission and conversion between the microcontroller 21 and the other modules such as the power supply module 1, the high-side driving module 3, the low-side driving module 4, and the diagnostic module 5, and may include functional circuits for realizing functions different from those of the high-side driving module 3, the low-side driving module 4, and the diagnostic module 5, for example, for realizing functions of calculation, amplification, counting, synchronization, wireless communication, and the like.
Furthermore, it should be noted that, the process of generating the corresponding second control signal by the microcontroller 21 according to the specific relay driving requirement and driving condition includes: when the driving requirement requires that the voltage of the power module 1 (i.e. the voltage of the external power source connected to the input end of the power module 1) is directly supplied to the relay and the voltage of the power module 1 (i.e. the voltage of the external power source connected to the input end of the power module 1) is within the range of the input voltage allowed by the control coil 6 of the relay, the microcontroller 21 outputs a second control signal in On/off form (i.e. an On/off signal) to be supplied to the low-side driving module 4; when the driving requirement requires that the voltage of the voltage transformation driving the relay or the power module 1 (i.e. the voltage of the external power source connected to the input end of the power module 1) is higher than the maximum input voltage allowed by the control coil 6 of the relay, the microcontroller 21 outputs a second control signal (i.e. PWM signal) in PWM form, and provides the second control signal to the low-side driving module 4. Therefore, in a special working condition, when the voltage of the power supply module 1 (i.e. the voltage of the external power supply connected with the input end of the power supply module 1) is higher than the maximum voltage allowed to be input by the control coil 6 of the relay, the second control signal in the form of PWM can be adopted to enable the low-side driving module 4 to conduct or close the passage between the low-side driving module and the negative end 62 of the control coil 6 of the relay at a set frequency and a duty ratio so as to adjust the equivalent voltage of the control coil 6 for driving the relay, drive the relay to be attracted or disconnected and ensure the normal operation of the relay.
Referring to fig. 1-2, the high-side driving module 3 includes a high-side driving switch circuit 31 and a clamp circuit 32. The control end of the high-side driving switch circuit 31 is used as one input end of the high-side driving module 3, and is connected with one end of the control module, one end of a switch path of the high-side driving switch circuit 31 is used as the other input end of the high-side driving module 3, and is connected with the driving output power supply module 11 of the power module 1, and the other end of the switch path of the high-side driving switch circuit 31 is used as the output end of the high-side driving module 3, and is connected with the positive end 61 of the control coil 6 of the relay. The high-side driving switch circuit 31 is configured to supply the voltage obtained from the driving output power supply module 11 to the relay under the control of the first control signal provided by the microcontroller 21, so as to drive the relay to be turned on or off. The output end of the clamping circuit 32 is connected with the other end of the switch path of the high-side driving switch circuit 31 and the positive end 61 of the control coil 6 of the relay, the input end of the clamping circuit 32 is grounded and is simultaneously connected with one end of the low-side driving module 4, the clamping circuit 32 is used for realizing the series connection of the high-side driving module 3 and the low-side driving module 4, and at the moment of disconnection of the relay, the induced electromotive force excited on the control coil 6 at the moment of disconnection of the relay is limited, the energy is absorbed, the induced electromotive force on the control coil 6 of the relay is embedded on a fixed voltage, the current of the control coil 6 is quickly reduced, the turn-off speed of the relay is improved, and the relay can be quickly turned off.
With continued reference to fig. 1-2, the low-side driving module 4 includes a low-side driving switch circuit 41 and a freewheel circuit 42. The control end of the low-side driving switch circuit 41 is used as one input end of the low-side driving module 4 and is connected to a second GPIO interface (not shown) of the microcontroller 21, one end of a switch path of the low-side driving switch circuit 41 is used as the other input end of the low-side driving module 4 and is grounded GND and is simultaneously connected to one end of the clamp circuit 32, and the other end of the switch path of the low-side driving switch circuit 41 is used as the output end of the low-side driving module 4 and is connected to the negative end 62 of the control coil 6 of the relay. The low-side driving switch circuit 41 is configured to directly output the voltage of the power module 1 (i.e. the voltage of the input end of the power module 1 connected to the external power supply) to supply power to the relay under the control of the second control signal provided by the microcontroller 21, so as to drive the relay to be turned on or off, or to turn on or off the path between the relay and the negative end of the control coil 6 of the relay with a set frequency and a duty ratio, so as to adjust the equivalent voltage of the control coil 6 driving the relay, and drive the relay to be turned on or off. The input end of the freewheel circuit 42 is connected to one end of the switching path of the low-side driving switch circuit 41 and the negative end 62 of the control coil 6 of the relay, the output end of the freewheel circuit 42 is connected to one end of the high-side driving switch circuit 31 connected to the power module 1 (i.e. one end of the high-side driving switch circuit 31 connected to the driving power UB), and the freewheel circuit 42 is configured to provide a freewheel path for the control coil 6 of the relay during a period when the low-side driving switch circuit 41 is turned off at the set frequency and the duty ratio (i.e. during a period when the MOS transistor is turned off in the PWM driving output), so as to keep the current of the control coil 6 of the driving relay to be a set average current, so as to ensure that the relay maintains a closed state.
The high-side driving switch circuit 31 and the low-side driving switch circuit 41 may be mainly built up by at least one MOS transistor, respectively. The clamp circuit 32 includes, but is not limited to, a clamp structure that is self-contained in a transient suppression diode or high-side drive switch circuit, and other equivalent circuits, and the freewheel circuit 42 may be implemented by a freewheel diode, freewheel MOS transistor, or other equivalent circuits.
As an example, the high-side driving switch circuit 31 and the low-side driving switch circuit 41 each have one MOS transistor, the clamp circuit 32 has one transient suppression diode, and the freewheel circuit 42 has one freewheel diode. The gate of the MOS transistor of the high-side driving switch circuit 31 is connected to a first GPIO interface (not shown) of the microcontroller 21 as a control terminal of the high-side driving switch circuit 31, the drain of the MOS transistor of the high-side driving switch circuit 31 is connected to one end of a switching path of the high-side driving switch circuit 31, and is simultaneously connected to the driving power UB, a cathode of a first diode (not shown) and a cathode of a freewheeling diode of the freewheeling circuit 42, and the source of the MOS transistor of the high-side driving switch circuit 31 is connected to the positive terminal 61 of the control coil 6 of the relay, the anode of the first diode and the cathode of a zener diode of the clamp circuit 32 as an output terminal of the high-side driving switch circuit 31 and the other end of the switching path of the high-side driving switch circuit 31. The anode of the transient suppression diode of the clamp circuit 32 is grounded and connected to the source of the MOS transistor of the high-side driving switch circuit 31, the gate of the MOS transistor of the high-side driving switch circuit 31 is connected to the control terminal of the low-side driving switch circuit 41, the drain of the MOS transistor of the low-side driving switch circuit 41 is connected to the output terminal of the low-side switch circuit 41 as one end of the switch path of the low-side driving switch circuit 41, the anode of the flywheel diode, the cathode of the second diode (not shown) and the negative terminal 62 connected to the control coil 6 of the relay are connected, and the source of the MOS transistor of the low-side driving switch circuit 41 is grounded as the other end of the switch path of the low-side driving switch circuit 41. Thereby, the low-voltage driving module 4 and the high-voltage driving module 3 are connected in series.
In addition, when the relay driving circuit of the present embodiment is integrated into one chip, the output terminal of the high-side driving switch circuit 31 may be formed as a high-side output pin P1 for connecting the positive terminal 61 of the control coil 6 of the relay, and the output terminal of the low-side driving switch circuit 41 may be formed as a low-side output pin P2 for connecting the negative terminal 62 of the control coil 6 of the relay.
In addition, the MOS transistors in the high-side driving switch circuit 31 and the low-side driving switch circuit 41 are all intelligent MOS transistors, and have the functions of overcurrent current limiting and overtemperature turn-off, so that when the output pins P1 and P2 have short-circuit faults, the current limiting can be ensured to be at a fixed value when the current is overlarge, the overlarge current of the control coil 6 of the relay is avoided, the automatic turn-off can be ensured when the temperature of the MOS transistor exceeds an overtemperature threshold, and the MOS transistor is protected from being damaged. That is, when the high side output pin P1 and the low side output pin P2 have a short circuit fault, the MOS transistors having the functions of overcurrent limiting and overtemperature turn-off in the high side driving switch circuit 31 and the low side driving switch circuit 41 can limit the current flowing through the high side output pin P1 and the low side output pin P2 at a fixed value so as to avoid the excessive driving current transmitted to the control coil of the relay by the high side driving switch circuit 31 and the low side driving switch circuit 41, thereby preventing the excessive driving current from damaging the control coil 6 of the external relay and causing the problem of failure of the MOS transistors inside the high side driving switch circuit 31 and the low side driving switch circuit 41, and simultaneously, when the high side output pin P1 and the low side output pin P2 have a short circuit fault, the MOS transistors having the functions of overcurrent limiting and overtemperature turn-off can also automatically turn off when the circuit temperature exceeds a set overtemperature threshold, thereby preventing the problem of damaging the control coil 6 of the external relay and causing the failure of the MOS transistors inside the high side driving switch circuit 31 and the low side driving switch circuit 41.
In this embodiment, the high-side driving switch circuit 31 and the low-side driving switch circuit 41 cooperate under the control of the microcontroller 21 of the control module 2 to realize driving and controlling of the control coil 6 of the relay. After the high-side driving module 3 and the low-side driving module 4 are connected in series, the high-side and low-side series driving can be implemented on the control coil 6 of the relay, so that the problem that when a single output pin (P1 or P2) is short-circuited to the ground or the power supply fails, an unexpected voltage difference (for example, the battery voltage of an external storage battery connected with the power supply module 1 is equal to the load voltage of the control coil 6 of the relay between the positive end 61 and the negative end 62) is effectively avoided, and the misoperation of the relay is caused.
In addition, according to the driving requirement of the control coil 6 or the requirement of different working conditions, the first control signal and the second control signal generated by the control module 2 can enable the high-side driving switch circuit 31 and the low-side driving switch circuit 41 to work cooperatively, so as to control the control coil 6 of the relay to work in an on/off driving mode or a PWM driving mode. In both driving modes, the high side driving switch circuit 31 is operated in on/off state, and the low side driving switch circuit 41 is operated in on/off state or PWM state depending on whether the voltage of the power module 1 (i.e., the voltage of the external power source connected to the input terminal of the power module 1) is required to be directly supplied to the relay or whether the voltage of the power module 1 (i.e., the voltage of the external power source connected to the input terminal of the power module 1) is within the allowable input voltage range of the control coil 6 of the relay, and the low side driving switch circuit 41 is operated in on/off state when the voltage of the power module 1 (i.e., the voltage of the external power source connected to the input terminal of the power module 1) is required to be directly supplied to the relay and whether the voltage of the power module 1 (i.e., the voltage of the external power source connected to the input terminal of the power module 1) is within the allowable input voltage range of the control coil 6 of the relay or not, and is required to be directly supplied to the relay or the voltage of the power module 1 (i.e., the voltage of the external power source connected to the input terminal of the power source of the power module 1) is higher than the allowable input voltage of the control coil 6 of the relay. In the PWM driving mode, the microcontroller 21 controls the side driving switch circuit 41 to operate in a PWM state (i.e. to perform PWM output at a set frequency and duty ratio) according to different driving conditions, so as to regulate the equivalent output voltage between the high side output pin P1 and the low side output pin P2, thereby realizing step-down output and ensuring safe operation of the relay under the working conditions including, but not limited to, the voltage of the power module 1 (i.e. the voltage of the external power source connected to the input end of the power module 1) is greater than the maximum input voltage allowed to be loaded by the control coil 6.
Referring to fig. 1 and 3, the diagnostic module 5 can diagnose at least one fault state of the positive terminal 61 of the control coil 6 of the relay being shorted to the power module 1 (i.e., P1 being shorted to the power source), the negative terminal 62 of the control coil 6 of the relay being shorted to the ground (i.e., P2 being shorted to the power source), the positive terminal 61 of the control coil 6 of the relay being open (i.e., P1 being open), and the negative terminal 62 of the control coil 6 of the relay being open (i.e., P2 being open) according to the diagnostic requirement. The diagnostic module 5 comprises a high-side diagnostic circuit 51 and a low-side diagnostic circuit 52, the high-side diagnostic circuit 51 comprising a high-side diagnostic network 511 and a high-side voltage divider circuit 512, the low-side diagnostic circuit 52 comprising a low-side diagnostic network 521 and a low-side voltage divider circuit 522.
One end of the high-side diagnostic network 511 is used as a sampling end of the diagnostic module 5, and is connected to the positive end 61 of the control coil 6 of the relay by connecting the high-side output pin P1, the other end of the high-side diagnostic network 511 is used as an output end of the diagnostic module 5, and is connected to a sampling interface of the microcontroller 21 of the control module 2, and the high-side diagnostic network 511 is used for monitoring and sampling the positive end 61 (i.e. the high-side output pin P1) of the control coil 6 of the relay, and transmitting (i.e. feeding back) the monitored and sampled data (including the voltage information and the signal state of the high-side output pin P1) to the microcontroller 21 of the control module 2, so that the microcontroller 21 of the control module 2 determines whether the positive end 61 of the control coil 6 of the relay and the high-side driving module 3 connected to the positive end 61 are faulty according to the monitored and sampled data. Specifically, the microprocessor 21 obtains feedback information of the high-side diagnostic network 511 and the low-side diagnostic network 521 through GPIO interfaces connected to the high-side diagnostic network 511, including voltage information of the high-side output pin P1 and voltage information of the low-side output pin P2, and completes fault diagnosis of the voltage of the high-side output pin P1 and the low-side output pin P2 in combination with control states of the high-side driving module 3 and the low-side driving module 4.
The high-side voltage bias circuit 512 is connected to the positive terminal 61 of the control coil 6 of the relay and the high-side diagnostic network 511 by connecting the high-side output pin P1, the high-side voltage bias circuit 512 provides a fixed level and a voltage dividing network for the high-side output pin P1 in a closed (i.e., off) state of the high-side drive switch circuit 31 of the high-side drive module 3, and the high-side voltage bias circuit 512 can make the voltage of the high-side output pin P1 present four voltage states in total in four different states of normal connection of the positive terminal 61 of the control coil 6 to the high-side output pin P1, short circuit of the high-side output pin P1 to a power supply, short circuit of the high-side output pin P1 to a ground, and open circuit of the high-side output pin.
One end of the low-side diagnostic network 521 is used as the other sampling end of the diagnostic module 5, and is connected with the negative end 62 of the control coil 6 of the relay by connecting the low-side output pin P2, the other end of the low-side diagnostic network 521 is used as the other output end of the diagnostic module 5, and is connected with the corresponding sampling interface of the microcontroller 21 of the control module 2, the low-side diagnostic network 521 is used for monitoring and sampling the negative end 62 (i.e. the low-side output pin P2) of the control coil 6 of the relay, and the monitored and sampled data (including the voltage information and the signal state of the low-side output pin P2) are transmitted back to the microcontroller 21 of the control module 2, so that the microcontroller 21 of the control module 2 judges whether the negative end 62 (i.e. the low-side output pin P2) of the control coil 6 of the relay and the low-side driving module 4 connected with the negative end 62 (i.e. the low-side output pin P2) fail or not according to the monitored and sampled data. Specifically, the microprocessor 21 obtains feedback information of the high-side diagnostic network 511 and the low-side diagnostic network 521 through the GPIO interface connected to the low-side diagnostic network 511, including the voltage of the low-side output pin P1 and the voltage information of the low-side output pin P2, and completes fault diagnosis of the voltage of the high-side output pin P1 and the low-side output pin P2 in combination with the control states of the high-side driving module 3 and the low-side driving module 4.
The low-side voltage bias circuit 522 is connected to the negative terminal 62 of the control coil 6 of the relay and the low-side diagnostic network 521 by connecting the low-side output pin P2, and the low-side voltage bias circuit 522 provides a fixed level and a voltage dividing network for the low-side output pin P2 in the off (i.e., off) state of the low-side drive switch circuit 41 of the low-side drive module 4, and the low-side voltage bias circuit 522 can make the voltage on the low-side output pin P2 assume four voltage states in total in four different states of normal connection of the negative terminal 62 of the control coil 6 to the low-side output pin P2, short-circuiting of the low-side output pin P2 to the power supply, short-circuiting of the low-side output pin P2 to the ground, and opening of the low-side output pin P2.
The high-side diagnostic network 511 and the low-side diagnostic network 521 connect the high-side output pin P1 and the low-side output pin P2 with the corresponding GPIO ports of the microcontroller 21, so as to sample the voltages of the high-side output pin P1 and the low-side output pin P2 by the microcontroller 21. In the off (off) state of the switching paths of the high-side driving module 3 and the low-side driving module 4, the microcontroller 21 samples the voltages of the high-side output pin P1 and the low-side output pin P2 through the high-side diagnosis network 511 and the low-side diagnosis network 521, compares the sampled voltages with a designed voltage range, diagnoses whether there is a fault in the high-side output pin P1 and the low-side output pin P2, and determines which fault is specifically short-circuited to the power supply, short-circuited to the ground, and open-circuited.
Under the working condition that the relay is disconnected, if the high-side output pin P1 or the low-side output pin P2 has single-point faults, under the control of the microcontroller 21, voltage can not be applied to the positive end and the negative end of the relay control coil 6, and misoperation of the relay is caused, so that the safety of load driving and the robustness of a system are improved. That is, the microcontroller 21 is further configured to control the outputs of the high-side driving module 3 and the low-side driving module 4 such that the voltage difference between the positive terminal 61 and the negative terminal 62 of the control coil 6 of the relay is 0 when a single point of failure occurs on the output of the high-side driving module 3 or the circuit between the output of the low-side driving module 4 and the control coil 6 under the condition that the relay is turned off.
Wherein, the high-side diagnostic network 511 and the low-side diagnostic network 521 each comprise an analog-to-digital conversion circuit and a filtering voltage stabilizing circuit. The analog-to-digital conversion circuit is used for the microcontroller 21 to sample the output pin voltage and complete fault diagnosis in combination with a strategy, and the filtering voltage stabilizing circuit can be an RC filtering circuit and is used for filtering and stabilizing the collected voltage signals. The high side voltage bias circuit 512 and the low side voltage bias circuit 522 each include a voltage divider circuit, including but not limited to a resistive voltage divider version, that provides divided levels to the output pins P1 and P2.
In addition, it should be noted that, since the low-side driving module 4 in this embodiment can implement On/off and PWM driving output modes to meet the driving requirements of different relays, in the On/off driving output mode, the high-side diagnostic network 511 samples the voltage of the high-side output pin P1, the low-side diagnostic network 521 samples the voltage of the low-side output pin P2, in the PWM driving output mode, the high-side diagnostic network 511 samples the voltage of the high-side output pin P1, and the low-side diagnostic network 521 samples the frequency and duty ratio of the signal at the low-side output pin P2.
Based on the same inventive concept, the embodiment also provides an electrical system, which comprises at least one relay and a relay driving circuit connected with the relay, wherein the relay driving circuit is connected with the positive end and the negative end of a control coil of the relay and used for driving the relay to be attracted or disconnected.
The electrical system can be at least one of remote control equipment, telemetry equipment, communication equipment, automatic control equipment (comprising a car body controller, an electric car battery manager and the like), electromechanical integrated equipment (comprising an electric car and a charging pile) and mobile electronic equipment.
When the electric system is an electric automobile (namely a new energy automobile), the electric system further comprises a battery pack and a high-voltage electricity utilization load, wherein the battery pack is a vehicle-mounted storage battery, the input end of the power module 1 of the relay driving circuit is connected with the high-voltage electricity utilization load, the high-voltage electricity utilization load is connected with a contact of a relay, and the relay can be used as a main positive relay and a main auxiliary relay of the battery pack, a positive relay and an auxiliary relay of a charging circuit and a pre-charging relay for controlling pre-charging.
In summary, in the relay driving circuit and the electrical system provided in the embodiments, the high-side driving module 3 and the low-side driving module 4 receive the control signal of the control module 2 and then are turned on or turned off, so that the high-side and low-side serial driving mode is realized, the relay is driven to act, the problem that when the current relay driving circuit uses a single high-side switch or a single low-side switch to perform single-side driving, the relay is easy to malfunction when the short circuit of the high-side output pin P1 to the power supply or the short circuit of the low-side output pin P2 to the ground occurs is avoided; moreover, the driving requirements of on/off and PWM modes can be met, so that the relay is suitable for different application scenes, under two different driving modes, the voltage of the output pins of the high-side driving module 3 and the low-side driving module 4 is detected through the diagnosis module 5, whether the output pins of the high-side driving module 3 and the low-side driving module 4 are failed or not is judged according to the detection result, and the control module 2 controls the high-side driving module 3 and the low-side driving module 4 according to the judgment result so as to protect the relay, namely, the fault diagnosis of the high-side output pin and the low-side output pin can be completed according to the feedback information of the diagnosis module, so that the OBD diagnosis requirement of automobile application is met; in special working conditions (for example, under the condition that the voltage of the vehicle-mounted storage battery is higher than the maximum voltage allowed to be input by a control coil of the relay), the relay is ensured to work normally in a PWM equivalent voltage reduction mode. In addition, the relay driving circuit of the embodiment is provided with the high-side clamping circuit, so that the high-voltage relay can be ensured to be rapidly turned off at the moment of switching off the relay, and meanwhile, the internal circuit structure is protected from damage caused by overlarge induced electromotive force; the high-low side driving switch circuit has overcurrent limiting and over-temperature switching-off functions, and can protect an internal circuit and an external load from damage caused by overlarge current when an output pin breaks down.
It is apparent that the above embodiments describe in detail different configurations of the relay driving circuit, and of course, the present invention includes, but is not limited to, the configurations listed in the above embodiments, and any configuration that is changed based on the configurations provided in the above embodiments falls within the scope of the present invention. One skilled in the art can recognize that the above embodiments are illustrative.
The above description is only illustrative of the preferred embodiments of the present invention and is not intended to limit the scope of the present invention, and any alterations and modifications made by those skilled in the art based on the above disclosure shall fall within the scope of the appended claims.
Claims (14)
1. The relay driving circuit is connected with the positive end and the negative end of a control coil of a relay and used for driving the relay to be attracted or disconnected, and is characterized by comprising a power supply module, a control module, a high-side driving module and a low-side driving module,
the control module is also connected with the high-side driving module and the low-side driving module and is used for providing a first control signal for the high-side driving module and a second control signal for the low-side driving module;
The high-side driving module comprises a high-side driving switch circuit and a clamping circuit, wherein the control end of the high-side driving switch circuit is used as one input end of the high-side driving module and is connected with one end of the control module, one end of a switch path of the high-side driving switch circuit is used as the other input end of the high-side driving module and is connected with one end of the power module and one end of the low-side driving module, the other end of the switch path of the high-side driving switch circuit is used as the output end of the high-side driving module and is connected with the output end of the clamping circuit and the positive end of a control coil of the relay, and the input end of the clamping circuit is grounded and is connected with the other end of the low-side driving module; the high-side driving module is used for providing the voltage obtained from the power supply module for the relay under the control of the first control signal provided by the control module so as to drive the relay to be closed or opened; the clamping circuit is used for clamping the induced electromotive force on the control coil of the relay on a fixed voltage at the moment of switching off the relay so as to improve the switching-off speed of the relay; the method comprises the steps of,
The low-side driving module is connected with the high-side driving module in series through the clamping circuit and comprises a low-side driving switch circuit and a follow current circuit, wherein the control end of the low-side driving switch circuit is used as one input end of the low-side driving module and is connected with the other end of the control module, one end of a switch passage of the low-side driving switch circuit is used as the other input end of the low-side driving module and is grounded and is simultaneously connected with one end of the high-side driving module, and the other end of the switch passage of the low-side driving switch circuit is used as the output end of the low-side driving module and is connected with the negative end of a control coil of the relay and the input end of the follow current circuit; the low-side driving module is used for directly outputting the voltage of the power supply module to supply power to the relay under the control of the second control signal provided by the control module so as to drive the relay to be attracted or disconnected, or conducting or closing a passage between the low-side driving module and the negative end of the control coil of the relay with set frequency and duty ratio so as to adjust the equivalent voltage of the control coil for driving the relay and drive the relay to be attracted or disconnected; the freewheel circuit is used for providing freewheel channels for the control coil of the relay in the stage that the low-side driving switch circuit is closed at the set frequency and the set duty ratio so as to ensure that the relay is kept in a closed state.
2. The relay driving circuit according to claim 1, wherein the high-side driving switch circuit comprises a MOS transistor having protection functions of overcurrent limiting and overtemperature turning-off, and the MOS transistor is configured to limit a current flowing through an output terminal of the high-side driving module to a fixed value when a short circuit fault occurs at the output terminal of the high-side driving module, and automatically turn off when a temperature exceeds a set overtemperature threshold.
3. The relay driving circuit according to claim 1, wherein the low-side driving switching circuit comprises a MOS transistor having protection functions of overcurrent limiting and overtemperature shutdown, and the MOS transistor is configured to limit a current flowing through an output terminal of the low-side driving module to a fixed value when a short circuit fault occurs at the output terminal of the low-side driving module, and to automatically shut down when a temperature exceeds a set overtemperature threshold.
4. The relay driving circuit according to claim 1, wherein the first control signal is an on/off signal that directly controls a switching element in the high-side driving module to be on or off; the second control signal includes an on/off signal that directly controls a switching element in the low-side driving module to be on or off, and a PWM signal having the set frequency and duty ratio.
5. The relay driving circuit according to claim 4, wherein the control module is configured to provide the on/off signal or the PWM signal to the low-side driving module as the second control signal according to a specific driving requirement and driving condition of the relay.
6. The relay driving circuit according to claim 5, wherein when the driving requirement requires that the voltage of the power supply module is directly supplied to the relay and the voltage of the power supply module is within an allowable input voltage range of a control coil of the relay, the control module outputs the on/off signal as the second control signal to be supplied to the low-side driving module; when the driving requirement requires voltage transformation to drive the relay or the voltage of the power supply module is higher than the maximum input voltage allowed by the control coil of the relay, the control module outputs the PWM signal as the second control signal to be provided for the low-side driving module.
7. The relay driving circuit according to claim 5, wherein the control module is further configured to control the outputs of the high-side driving module and the low-side driving module such that a voltage difference between a positive terminal and a negative terminal of the control coil of the relay is 0 when a single point of failure occurs on the output of the high-side driving module or on a circuit between the output of the low-side driving module and the control coil under a condition that the relay is turned off.
8. The relay driving circuit according to any one of claims 1 to 7, further comprising a diagnostic module, one sampling end of the diagnostic module being connected to a positive end of a control coil of the relay, the other sampling end being connected to a negative end of the control coil of the relay, an output end of the diagnostic module being connected to the control module, the diagnostic module being configured to monitor the positive and negative ends of the control coil of the relay and to transmit monitored data back to the control module, so that the control module determines whether the relay is malfunctioning based on the monitored data.
9. The relay driving circuit of claim 8, wherein the diagnostic module comprises:
the high-side diagnosis circuit is used for monitoring the positive end of the control coil of the relay and transmitting the monitored data back to the control module so that the control module judges whether the positive end of the relay and the high-side driving module connected with the positive end are in fault or not according to the monitored data; the method comprises the steps of,
The low-side diagnosis circuit is used for monitoring the negative end of the control coil of the relay and transmitting monitored data back to the control module, so that the control module judges whether the negative end of the relay and the low-side driving module connected with the negative end are faulty according to the monitored data.
10. The relay drive circuit of claim 8, wherein the fault comprises at least one of a positive side of the control coil of the relay being shorted to a power source, a negative side of the control coil of the relay being shorted to ground, a positive side of the control coil of the relay being open, and a negative side of the control coil of the relay being open.
11. The relay driving circuit according to claim 9, wherein the first control signal is an on/off signal that directly controls the switching element in the high-side driving module to be on or off, and the second control signal is an on/off signal that directly controls the switching element in the low-side driving module to be on or off, the high-side diagnostic circuit samples a voltage of an output terminal of the high-side driving module or a voltage of a positive terminal of a control coil of the relay, and the low-side diagnostic circuit samples a voltage of an output terminal of the low-side driving module or a voltage of a negative terminal of the control coil of the relay; when the first control signal is an on/off signal for directly controlling a switching element in the high-side driving module to be on or off, and the second control signal is a PWM signal having the set frequency and duty ratio, the high-side diagnostic circuit samples a voltage of an output terminal of the high-side driving module or a voltage of a positive terminal of a control coil of the relay, and the low-side diagnostic circuit samples a frequency and duty ratio of an output signal of an output terminal of the low-side driving module.
12. The relay driving circuit according to claim 8, wherein the power supply module includes:
the driving output power supply module is connected with the high-side driving module and the low-side driving module and is used for providing driving power for the high-side driving module and the low-side driving module; the method comprises the steps of,
and the internal circuit power supply module is connected with the control module and the diagnosis module and is used for providing an internal circuit power supply for the control module and the diagnosis module.
13. An electrical system comprising at least one relay and a relay driver circuit as claimed in any one of claims 1 to 12 connected to the relay, the relay driver circuit being connected to the positive and negative terminals of the control coil of the relay for driving the relay to engage or disengage.
14. The electrical system of claim 13, wherein the electrical system is a charging post, a body controller, an electric vehicle battery management system, a remote control device, a telemetry device, a wireless communication device, a pure electric vehicle, or a hybrid electric vehicle, and wherein the input end of the power module is connected to a vehicle-mounted battery when the electrical system is an electric vehicle battery management system, a pure electric vehicle, or a hybrid electric vehicle.
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| CN115248373B (en) * | 2021-04-27 | 2024-03-19 | 宁德时代新能源科技股份有限公司 | Relay adhesion detection method and device |
| 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 |
| CN114783829B (en) * | 2022-05-07 | 2024-05-28 | 东软睿驰汽车技术（沈阳）有限公司 | Relay driving circuit and diagnosis method thereof |
| US20240006893A1 (en) | 2022-07-01 | 2024-01-04 | Caterpillar Inc. | Circuit to drive electrically controlled switches within electrified machine |
| CN117595845A (en) * | 2023-11-21 | 2024-02-23 | 一汽解放汽车有限公司 | Driving circuit, control method and vehicle |
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| CN108493904A (en) * | 2018-05-08 | 2018-09-04 | 上海金脉电子科技有限公司 | IGBT Safety Shutdown Systems and method for automobile motor shutdown |
| JP2019037079A (en) * | 2017-08-18 | 2019-03-07 | ローム株式会社 | Overcurrent protection circuit |
| CN109541457A (en) * | 2019-01-04 | 2019-03-29 | 中国第汽车股份有限公司 | Power battery high-voltage relay control circuit and method for diagnosing faults |
| CN109951060A (en) * | 2019-03-29 | 2019-06-28 | 西北工业大学 | High voltage half-bridge driving circuit |
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2019
- 2019-07-12 CN CN201910631604.9A patent/CN112216558B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203720299U (en) * | 2014-01-21 | 2014-07-16 | 浙江万向亿能动力电池有限公司 | Relay coil driving diagnosis device |
| JP2019037079A (en) * | 2017-08-18 | 2019-03-07 | ローム株式会社 | Overcurrent protection circuit |
| CN108493904A (en) * | 2018-05-08 | 2018-09-04 | 上海金脉电子科技有限公司 | IGBT Safety Shutdown Systems and method for automobile motor shutdown |
| CN109541457A (en) * | 2019-01-04 | 2019-03-29 | 中国第汽车股份有限公司 | Power battery high-voltage relay control circuit and method for diagnosing faults |
| CN109951060A (en) * | 2019-03-29 | 2019-06-28 | 西北工业大学 | High voltage half-bridge driving circuit |
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| CN112216558A (en) | 2021-01-12 |
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