Drive device and electric drive device

Abstract

The utility model discloses a driving device and electric driving equipment. The driving device comprises a flyback transformer circuit, a driving circuit and a feedback circuit. Wherein the input end of the flyback transformer circuit is connected with the power supply circuit, the output end of the flyback transformer circuit is connected with the input end of the feedback circuit, and the output end of the feedback circuit is connected with the control circuit; the flyback transformer circuit is configured to receive a control signal provided by the control circuit, perform voltage conversion on a first voltage provided by the power supply circuit according to the control signal, and generate a second voltage; the output end of the flyback transformer circuit is further connected with the input end of the driving circuit, the output end of the driving circuit is connected with a coil of the relay, and the driving circuit is configured to provide the second voltage for the coil so that a contact of the relay can be closed. Therefore, stable power supply voltage can be provided for the coil of the relay, and the safety and reliability of the circuit are improved.

Description

Technical Field

[0001] The utility model relates to the field of electronic technology and electric power control technology, in particular to a driving device and an electric driving equipment. Background Art

[0002] In the vehicle system, the relay can connect the circuit between the battery pack and the load, releasing the electric energy stored in the battery pack for the load to use. The coil of the relay is usually powered directly by the vehicle power supply through the high and low side drive units. When the high and low side drive units are closed, the vehicle power supply will directly power the coil of the relay. However, when there is a problem with the vehicle power supply, such as a momentary drop in the voltage of the vehicle power supply, the coil power supply will be unstable, causing the relay to stick unexpectedly, reducing the stability and safety of the circuit. Utility Model Content

[0003] The utility model provides a driving device and an electric driving equipment, which can provide a stable power supply voltage for a coil of a relay, thereby improving the safety and reliability of the circuit.

[0004] The technical solution of the utility model is achieved in this way:

[0005] In a first aspect, an embodiment of the utility model provides a driving device, which includes a flyback transformer circuit, a driving circuit and a feedback circuit; wherein:

[0006] The input end of the flyback transformer circuit is connected to the power supply circuit, the output end of the flyback transformer circuit is connected to the input end of the feedback circuit, and the output end of the feedback circuit is connected to the control circuit;

[0007] The flyback transformer circuit is configured to receive a control signal provided by the control circuit, and perform voltage conversion on a first voltage provided by the power supply circuit according to the control signal to generate a second voltage;

[0008] The output end of the flyback transformer circuit is also connected to the input end of the drive circuit, the output end of the drive circuit is connected to the coil of the relay, and the drive circuit is configured to provide a second voltage to the coil to close the contacts of the relay.

[0009] Through the above-mentioned technical means, the output end of the flyback transformer circuit is connected to the power supply circuit, and the first voltage output by the power supply circuit can be received at this time; the input end of the feedback circuit is connected to the output end of the flyback transformer circuit, and the output end of the feedback circuit is connected to the control circuit. At this time, the control circuit can send a control signal to the flyback transformer circuit according to the feedback signal of the feedback circuit, so that the flyback transformer circuit converts the first voltage into a second voltage according to the received control signal; the output end of the flyback transformer circuit is also connected to the input end of the drive circuit, and the output end of the drive circuit is connected to the coil of the relay. At this time, the drive circuit can provide the second voltage provided by the flyback transformer circuit to the coil to close the contacts of the relay. In this way, the use of a flyback transformer circuit can prevent surge current and interference in the power supply circuit (i.e., the power supply circuit of the coil), thereby stabilizing the power supply voltage; and a feedback circuit is used to detect the output condition of the output end of the flyback transformer circuit, and the output condition is fed back to the control circuit through the feedback circuit, so that the control circuit adjusts the output of the flyback transformer according to the output condition, such as the output overvoltage or undervoltage of the flyback transformer circuit, and sends a control signal to the flyback transformer circuit to adjust the output voltage of the flyback transformer, thereby stabilizing the power supply voltage for the coil, avoiding unexpected adhesion of the relay coil due to voltage drop, etc., thereby improving the safety and stability of the circuit.

[0010] In some embodiments, the flyback transformer circuit includes a switching unit and a flyback transformer, and the flyback transformer includes a primary winding and a secondary winding; wherein: the non-same-name end of the primary winding is connected to the first output end of the power supply circuit, and the same-name end of the primary winding is connected to the first end of the switch unit; the same-name end of the secondary winding is connected to the first input end of the drive circuit, and the non-same-name end of the secondary winding is connected to the second input end of the drive circuit; the second end of the switch unit is connected to the second output end of the power supply circuit, and the control end of the switch unit is connected to the control circuit; the switch unit is configured to receive a control signal sent by the control circuit, and perform voltage conversion on the first voltage according to the control signal.

[0011] Through the above technical means, the flyback transformer can convert the input voltage or current into the required output voltage or current, and can achieve electrical isolation between the input and output, prevent surge current and interference in the power supply circuit (i.e., the power supply circuit of the coil), thereby ensuring the safety of the circuit. In addition, through the switching action of the switch unit, the on and off of the input current of the primary winding of the flyback transformer is controlled, thereby achieving efficient conversion and transfer of energy. For example, when the switch unit is closed, the input electric energy is stored in the primary winding of the flyback transformer; when the switch is disconnected, the energy stored in the flyback transformer is released to the secondary winding to power the coil, which can avoid the problem of unstable power supply of the coil caused by a sudden drop in the power supply voltage, thereby improving the safety and reliability of the circuit.

[0012] In some embodiments, the switching unit includes a first switch, a first resistor, and a second resistor; wherein: the first end of the first resistor is connected to the control circuit, and the second end of the first resistor is respectively connected to the first end of the second resistor and the control end of the first switch; the control end of the first switch is also connected to the first end of the second resistor, and the first end of the first switch is connected to the same-name end of the primary winding; the second end of the first switch and the second end of the second resistor are both connected to the ground; the first switch is configured to receive a control signal sent by the control circuit, and pulse width modulate the first voltage according to the control signal.

[0013] Through the above technical means, the switching action of the first switch can not only control the transfer of energy, but also realize the voltage conversion. Specifically, by adjusting the closing and opening time of the first switch (i.e., the pulse width modulation duty cycle) according to the control signal, the turn ratio of the primary winding and the secondary winding of the flyback transformer can be changed, thereby realizing the regulation of the output voltage. In addition, the use of the first resistor and the second resistor can play a voltage dividing role on the control signal, and by grounding one end of the second resistor, a stable level state, such as a low level, can be provided for the control end of the first switch or the control pin of the control circuit. In this way, even if the external environmental factors change, the level state of the control end of the first switch or the control pin of the control circuit can also remain stable, thereby ensuring the safety of the circuit.

[0014] In some embodiments, the flyback transformer circuit also includes an absorption unit, and the absorption unit includes a third resistor, a first capacitor and a first diode; wherein: the first end of the third resistor is respectively connected to the first output end of the power supply circuit and the first end of the first capacitor, and the second end of the third resistor is respectively connected to the cathode end of the first diode and the second end of the first capacitor; the first end of the first capacitor is also connected to the non-same-name end of the primary winding, and the second end of the first capacitor is also connected to the cathode end of the first diode; the anode end of the first diode is respectively connected to the first end of the first switch and the same-name end of the primary winding.

[0015] Through the above-mentioned technical means, an absorption circuit is formed by using a third resistor, a first capacitor and a first diode. The absorption circuit can absorb the leakage inductance peak voltage generated when the first switch is turned off and convert it into electrical energy, thereby effectively reducing the electromagnetic interference in the first switch, and can also protect the first switch from voltage breakdown and overcurrent damage, thereby improving the safety of the circuit.

[0016] In some embodiments, the flyback transformer circuit also includes a rectifier unit, and the rectifier unit includes a second diode and a second capacitor; wherein: the anode terminal of the second diode is connected to the same-name terminal of the secondary winding, and the cathode terminal of the second diode is respectively connected to the first input terminal of the drive circuit and the first end of the second capacitor; the first end of the second capacitor is also connected to the first input terminal of the drive circuit, and the second end of the second capacitor is respectively connected to the second input terminal of the drive circuit and the ground.

[0017] Through the above technical means, the second diode and the second capacitor form a rectifying unit. When the second diode converts the AC voltage output by the secondary winding of the flyback transformer into a DC voltage, the output voltage will fluctuate. The second capacitor in parallel can absorb these fluctuations, making the output voltage more stable and smooth, thereby stabilizing the power supply voltage to power the coil.

[0018] In some embodiments, the feedback circuit includes a current feedback unit and a current detection component; wherein: the current detection component is connected in series between the second input terminal of the driving circuit and the non-same-name terminal of the secondary winding; the first input terminal of the current feedback unit is connected to the first terminal of the current detection component, the second input terminal of the current feedback unit is connected to the second terminal of the current detection component, and the output terminal of the current feedback unit is connected to the control circuit; the current feedback unit is configured to detect the output current of the secondary winding, generate a current feedback signal, and transmit the current feedback signal to the control circuit.

[0019] Through the above-mentioned technical means, the current detection component is connected between the second input terminal of the driving circuit and the non-same-name terminal of the secondary winding, and the input terminal of the current feedback unit is connected to the current detection component, so that the output current of the secondary winding can be detected, and the generated current feedback signal is transmitted to the control circuit, so that the control circuit determines whether the output current of the secondary winding is abnormal (for example, overcurrent or undercurrent) according to the current feedback signal, and when the output current is abnormal, sends a control signal to the flyback transformer circuit to adjust the output of the flyback transformer, so as to stably supply power to the coil, avoid unexpected adhesion of the relay coil due to abnormal current, etc., and thereby improve the safety and stability of the circuit.

[0020] In some embodiments, the feedback circuit also includes a voltage feedback unit, wherein: an input end of the voltage feedback unit is connected to the first output end of the driving circuit, and an output end of the voltage feedback unit is connected to the control circuit; the voltage feedback unit is configured to detect the output voltage of the secondary winding, generate a voltage feedback signal, and transmit the voltage feedback signal to the control circuit.

[0021] Through the above-mentioned technical means, the input end of the voltage feedback unit is connected to the first output end of the driving circuit, and the output end of the voltage feedback unit is connected to the control circuit, so that the output voltage of the secondary winding can be detected, and the generated voltage feedback signal is transmitted to the control circuit, so that the control circuit determines whether the output voltage of the secondary winding is abnormal (for example, undervoltage or overvoltage) according to the voltage feedback signal, and when the output voltage is abnormal, sends a control signal to the flyback transformer circuit to adjust the output voltage of the flyback transformer, so as to stably supply power to the coil, avoid unexpected adhesion of the relay coil due to abnormal current, etc., and thereby improve the safety and stability of the circuit.

[0022] In some embodiments, the driving device also includes a sampling circuit; wherein: the output end of the sampling circuit is connected to the control circuit, and the input end of the sampling circuit is connected between the output end of the driving circuit and the coil; the sampling circuit is configured to collect the driving voltage output by the driving circuit and transmit the driving voltage to the control circuit; the control circuit is configured to perform fault diagnosis on the coil based on the driving voltage.

[0023] Through the above-mentioned technical means, the input end of the sampling circuit is connected between the output end of the driving circuit and the coil, and the output end of the sampling circuit is connected to the control circuit. The driving voltage output by the driving circuit is collected through the sampling circuit, and the driving voltage is transmitted to the control circuit, so that the control circuit performs fault diagnosis on the coil according to the driving voltage to determine whether the coil has faults such as short power supply, short ground, open circuit, etc., and when the coil has a fault, the control circuit can take corresponding measures to avoid further expansion of the fault, thereby improving the safety of the circuit.

[0024] In some embodiments, the driving circuit includes a first driving unit and a second driving unit, and the sampling circuit includes a first sampling unit and a second sampling unit; wherein: the input end of the first sampling unit is connected between the output end of the first driving unit and the first end of the coil, and the first sampling unit is configured to collect a first driving voltage output by the first driving unit; the input end of the second sampling unit is connected between the output end of the second driving unit and the second end of the coil, and the second sampling unit is configured to collect a second driving voltage output by the second driving unit.

[0025] Through the above technical means, the first sampling unit is connected between the output end of the first driving unit and the first end of the coil, and can collect the first driving voltage (such as high-side voltage) output by the first driving unit, so that the control circuit can diagnose whether the coil has short power supply, short ground (short circuit to ground), open circuit and other faults according to the first driving voltage. The second sampling unit is connected between the output end of the second driving unit and the second end of the coil, and can collect the second driving voltage (such as low-side voltage) output by the second driving unit, so that the control circuit can diagnose whether the coil has short power supply, short ground (short circuit to ground), open circuit and other faults according to the second driving voltage. And when there is a fault in the coil, the control circuit can take corresponding measures to avoid further expansion of the fault, thereby improving the safety of the circuit.

[0026] In some embodiments, the power supply circuit includes a power supply unit and a voltage conversion unit; wherein: the input end of the voltage conversion unit is connected to the power supply unit, and the output end of the voltage conversion unit is connected to the input end of the flyback transformer circuit; the voltage conversion unit is configured to perform voltage conversion on a third voltage provided by the power supply unit to generate a first voltage.

[0027] Through the above technical means, the voltage conversion unit can convert the third voltage provided by the power supply unit, for example, boost the third voltage to meet the power supply demand of the coil. In addition, through the voltage conversion unit and the flyback transformer circuit, the power supply voltage supplied to the coil can be stabilized to avoid unexpected adhesion of the relay coil due to voltage drop, thereby improving the safety and stability of the circuit.

[0028] In some embodiments, the driving device further includes a freewheeling circuit, and the freewheeling circuit is connected in parallel to both ends of the coil.

[0029] Through the above-mentioned technical means, the freewheeling circuit is connected in parallel at both ends of the relay coil, and the freewheeling circuit can provide a freewheeling loop for the coil. For example, when the relay coil is powered off, the freewheeling circuit is turned on to form a closed loop, so that the current or voltage can continue to flow for a period of time, thereby avoiding sudden changes in current or voltage and improving the stability and safety of the circuit.

[0030] In a second aspect, an embodiment of the utility model provides an electric drive device, which includes a relay, a control circuit, and a drive device as described in any one of the first aspects.

[0031] It should be understood that the above general description and the following detailed description are merely exemplary and explanatory, and are not intended to limit the technical solutions of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A schematic diagram of the structure of a driving device provided in an embodiment of the utility model Figure 1 ;

[0033] Figure 2 A schematic diagram of the structure of a driving device provided in an embodiment of the utility model Figure 2 ;

[0034] Figure 3 A schematic diagram of the composition structure of a sampling unit provided in an embodiment of the utility model;

[0035] Figure 4 A schematic diagram of the structure of a voltage conversion unit provided in an embodiment of the utility model;

[0036] Figure 5 A schematic diagram of the structure of a driving device provided in an embodiment of the utility model Figure 3 ;

[0037] Figure 6 A schematic diagram of the structure of a driving device provided in an embodiment of the utility model Figure 4 ;

[0038] Figure 7A schematic diagram of the structure of a current feedback unit provided in an embodiment of the utility model;

[0039] Figure 8 A schematic diagram of the structure of a voltage feedback unit provided in an embodiment of the utility model;

[0040] Fig. 9 A schematic diagram of the detailed structure of a driving device provided in an embodiment of the utility model;

[0041] Fig.10 A schematic diagram of an application scenario of a driving device provided by an embodiment of the utility model;

[0042] Fig.11 A schematic diagram of the composition structure of an electric drive device provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0043] In order to more thoroughly understand the features and technical contents of the embodiments of the present invention, the implementation of the embodiments of the present invention is described in detail below in conjunction with the accompanying drawings. The attached drawings are for reference only and are not intended to limit the embodiments of the present invention.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the field of the present invention. The terms used herein are only for the purpose of describing the embodiments of the present invention and are not intended to limit the present invention.

[0045] In the following description, reference is made to “some embodiments”, which describe a subset of all possible embodiments, but it will be understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0046] It should also be pointed out that the terms "first\second\third" involved in the embodiments of the present invention are only used to distinguish similar objects and do not represent a specific ordering of the objects. It can be understood that "first\second\third" can be interchanged in a specific order or sequence where permitted, so that the embodiments of the present invention described here can be implemented in an order other than that illustrated or described here.

[0047] In addition, the reference to "embodiment" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present invention. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0048] The following is an introduction to the relevant terms and technologies of the present invention.

[0049] Metal-Oxide-Semiconductor (MOS) tube is a metal-oxide-semiconductor field-effect transistor, or metal-insulator-semiconductor. It is a special semiconductor structure mainly composed of three parts: metal, oxide and semiconductor.

[0050] A microcontroller (MCU) is an integrated circuit chip that integrates a central processing unit, memory, input / output interface and other related components. It can precisely control external devices by executing program code through its built-in central processing unit. In the vehicle system, the core control part of the battery management system (BMS) is responsible for signal detection and command control.

[0051] General-Purpose Input / Output (GPIO) is a common interface on integrated circuits such as microcontrollers, allowing the chip to interact with external circuits through simple digital signals. The GPIO interface can be used as an input interface to read the level status of the external circuit, or as an output interface to output high and low level signals to the external circuit, thereby controlling the working status of the external circuit.

[0052] Analog-to-Digital Converter (ADC) is a unit that converts analog signals into digital signals.

[0053] The Battery Monitoring Unit (BMU), the core part of the BMS, is responsible for monitoring various parameters of the battery pack or single cell to ensure the safe, stable and efficient operation of the battery.

[0054] A high-side driver (HSD) is a controllable switch added to the high voltage side (usually the power supply side) of the circuit. The load is turned on or off by closing or opening the switch, thereby achieving load control.

[0055] Low-Side Driver (LSD) adds a controllable switch to the ground end (usually the negative end) of the circuit, and controls the on and off of the load by closing or opening the switch, thereby controlling the load.

[0056] A boost circuit, also known as a step-up converter, is able to convert a lower input voltage to a higher output voltage.

[0057] Pulse Width Modulation (PWM) is a commonly used analog signal control technology that simulates the required analog signal level or realizes the control of analog circuits by changing the duty cycle of the pulse signal (that is, the ratio of pulse width to pulse period).

[0058] TL431 is a precision programmable reference chip, which can also be called a controllable voltage regulator. Its working principle is similar to that of an adjustable Zener diode. It contains a precision reference voltage source and an operational amplifier. When the reference terminal (REF) voltage reaches the reference voltage source, the operational amplifier controls the cathode to conduct, so that current is generated between the cathode and the anode, thereby stabilizing the output voltage.

[0059] As a key component in the battery management system, the power supply stability of the high-voltage relay coil is directly related to the safe operation of the battery system. If the power supply is unstable, the relay may not work properly, which in turn affects the battery system's charge and discharge control, short circuit protection, overvoltage / undervoltage protection and other functions. The failure of these functions may cause battery system failures and even lead to serious consequences such as battery fire and explosion.

[0060] New energy batteries are being used more and more widely in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are also being increasingly used in areas such as energy storage.

[0061] At present, new energy batteries are increasingly used in life and industry. New energy batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0062] In the embodiments of the utility model, the battery may be a battery cell, or may be a battery pack (Pack) composed of multiple battery cells. A battery cell refers to a basic unit that can realize the mutual conversion of chemical energy and electrical energy, and can be used to make a battery module or a battery pack, so as to supply power to an electrical device. A battery cell may be a secondary battery, which refers to a battery cell that can be continuously used by activating the active material by charging after the battery cell is discharged. The battery cell may be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, etc., and the embodiments of the present disclosure are not limited to this.

[0063] In the embodiment of the utility model, the battery can also be a single physical module including one or more battery cells to provide higher voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, in parallel or in mixed connection through a busbar component.

[0064] In the related art, the high-voltage relay coil of the BMS in the vehicle system is usually powered directly by the vehicle lead-acid power supply through the high and low side drivers of the BMU, but sometimes the power supply is unstable during the power supply process. For example, when the HSD / LSD chip is closed, the vehicle power supply voltage is directly supplied to both ends of the relay coil. If the vehicle power supply voltage drops instantly, the coil power supply will be unstable, which will cause the relay to malfunction, and then cause the equipment connected to the relay to malfunction.

[0065] In short, the relay in the vehicle system can connect the circuit between the battery pack and the load, and release the electric energy stored in the battery pack for the load to use. And the coil of the relay is usually directly powered by the vehicle power supply through the high-side drive unit or the low-side drive unit. When the high-side drive unit or the low-side drive unit is closed, the vehicle power supply will directly power the coil of the relay. However, when there is a problem with the vehicle power supply, such as a momentary drop in the voltage of the vehicle power supply, the power supply of the coil will be unstable, causing the relay to stick unexpectedly, reducing the stability and safety of the circuit.

[0066] Based on this, an embodiment of the utility model provides an output end of a flyback transformer circuit connected to a power supply circuit, and at this time, a first voltage output by the power supply circuit can be received; an input end of a feedback circuit is connected to an output end of a flyback transformer circuit, and an output end of the feedback circuit is connected to a control circuit, and at this time, the control circuit can send a control signal to the flyback transformer circuit according to a feedback signal of the feedback circuit, so that the flyback transformer circuit converts the first voltage into a second voltage according to the received control signal; the output end of the flyback transformer circuit is also connected to an input end of a driving circuit, and an output end of the driving circuit is connected to a coil of a relay, and at this time, the driving circuit can provide the second voltage provided by the flyback transformer circuit to the coil, so that the contacts of the relay are closed. In this way, the use of a flyback transformer circuit can prevent surge current and interference in the power supply circuit (i.e., the power supply circuit of the coil), thereby stabilizing the power supply voltage; and a feedback circuit is used to detect the output condition of the output end of the flyback transformer circuit, and the output condition is fed back to the control circuit through the feedback circuit, so that the control circuit adjusts the output of the flyback transformer according to the output condition, such as the output overvoltage or undervoltage of the flyback transformer circuit, and sends a control signal to the flyback transformer circuit to adjust the output voltage of the flyback transformer, thereby stabilizing the power supply voltage, avoiding unexpected adhesion of the relay coil due to voltage drop, etc., and thus improving the safety and stability of the circuit.

[0067] The present invention is further described in detail below through the accompanying drawings and specific embodiments.

[0068] In one embodiment of the present invention, Figure 1 A schematic diagram of the structure of a driving device provided in an embodiment of the utility model Figure 1 .like Figure 1 As shown, the driving device 10 includes a flyback transformer circuit 101, a driving circuit 102 and a feedback circuit 103; wherein:

[0069] The input end of the flyback transformer circuit 101 is connected to the power supply circuit 11, the output end of the flyback transformer circuit 101 is connected to the input end of the feedback circuit 103, and the output end of the feedback circuit 103 is connected to the control circuit;

[0070] The flyback transformer circuit 103 is configured to receive a control signal provided by the control circuit, and perform voltage conversion on the first voltage provided by the power supply circuit 11 according to the control signal to generate a second voltage;

[0071] The output end of the flyback transformer circuit 101 is also connected to the input end of the drive circuit 102. The output end of the drive circuit 103 is connected to the coil KL of the relay 12. The drive circuit 102 is configured to provide a second voltage to the coil KL to close the contact KS of the relay 12.

[0072] In the embodiment of the utility model, the relay 12 can be a low-voltage relay or a high-voltage relay. In the vehicle-mounted system, the relay is mainly divided into low-voltage and high-voltage relays according to the different working voltages of the vehicle; the relay 12 can include a coil KL and a contact KS. Among them, the contact KS refers to a contact in a normally open or normally closed state, and the state of the contact KS depends on the state of the coil KL. Here, the contact can also be called a contact switch; specifically, when the coil KL is energized, the electromagnetic field generated will attract the contact KS, making it closed, so that the circuit where the contact KS is located is turned on; when the coil KL is de-energized, the magnetic field disappears, and the contact KS returns to its original state, so that the circuit where the contact KS is located is disconnected. Here, the closure of the contact KS forms a path between the input circuit and the output circuit, and the current can pass smoothly, thereby enabling the controlled electrical equipment to work. For example, in the vehicle, the contacts of the relay are connected to the lights, audio, air conditioning and other equipment in the vehicle, and the motor of the car is controlled to operate normally through the closing and disconnection of the relay contacts, thereby ensuring the stability and safety of the vehicle-mounted circuit. In a specific embodiment, the relay 12 is a high voltage relay controlled by a BMS.

[0073] In an embodiment of the utility model, the driving circuit 102 may include a first driving unit and a second driving unit. Here, the first driving unit may be a high-side driver, and the second driving unit may be a low-side driver; or the first driving unit may be a low-side driver, and the second driving unit may be a high-side driver. In a specific embodiment, the first driving unit is a high-side driver, and the second driving unit is a low-side driver.

[0074] That is to say, the drive circuit 102 may include a high-side drive and a low-side drive. Here, the high-side drive refers to the connection of the coil of the switch or relay to the positive pole (or high potential) side of the power supply; the low-side drive refers to the connection of the coil of the switch or relay to the negative pole (or low potential) side of the power supply. Among them, both the high-side drive and the low-side drive include a switch component and a protection circuit; illustratively, the switch component of the high-side drive is a switch or a transistor, etc., which is located between the power supply and the load; the protection circuit of the high-side drive may be an overcurrent protection circuit, an overvoltage protection circuit, etc., to ensure that the circuit will not be damaged under abnormal conditions. It should be noted that the high-side drive or the low-side drive can provide a power supply voltage for the relay coil. By controlling the on and off of the high-side drive unit and the low-side drive unit, the power supply control of the relay coil can be realized, thereby controlling the opening and closing state of the relay contacts.

[0075] In an embodiment of the utility model, in an on-board application scenario, the on-board power supply directly supplies power to the coil through the high-side drive unit or the low-side drive unit of the BMU; specifically, when the high-side drive unit or the low-side drive unit is closed, the on-board power supply will directly supply power to the coil of the relay, but when there is a problem with the on-board power supply, such as an instantaneous drop in the voltage of the on-board power supply, it will cause unstable power supply to the coil, causing the load connected to the relay to malfunction due to unstable power supply, thereby affecting the stability and reliability of the entire system. Based on this, in an embodiment of the utility model, a flyback transformer circuit is added to the power supply circuit and the drive circuit. When the voltage output by the power supply circuit is unstable, the voltage output by the power supply circuit is stabilized by the flyback transformer circuit, and the stabilized voltage is provided to the coil for power supply, thereby improving the safety and reliability of the system.

[0076] In the implementation of the utility model, the ground terminal of the feedback circuit 103 is connected to the ground. In addition, the feedback circuit 103 may include multiple, illustratively, the feedback circuit 103 may include a current feedback unit and a voltage feedback unit, the current feedback signal is collected by the current feedback unit, and the voltage feedback signal is collected by the voltage feedback unit. The output ends of the feedback circuit 103 are connected to the control circuit, and the control circuit is configured to receive the feedback signal of the feedback circuit, and send a control signal to the flyback transformer circuit 101 according to the feedback signal, so that the flyback transformer circuit 101 performs voltage conversion on the first voltage provided by the power supply circuit 11 according to the control signal to generate a second voltage. Here, the control circuit can be an MCU or an integrated circuit (IC), and precise control of external devices can be achieved by executing program code.

[0077] In some embodiments, the driving device also includes a sampling circuit; wherein: the output end of the sampling circuit is connected to the control circuit, and the input end of the sampling circuit is connected between the output end of the driving circuit and the coil; the sampling circuit is configured to collect the driving voltage output by the driving circuit and transmit the driving voltage to the control circuit; the control circuit is configured to perform fault diagnosis on the coil based on the driving voltage.

[0078] In the embodiment of the utility model, the driving voltage output by the driving circuit can be collected by the sampling circuit, and the driving voltage can be transmitted to the control circuit; the control circuit diagnoses whether the coil KL of the relay 12 has a short power supply, a short ground (short circuit to the ground), an open circuit or other faults based on the driving voltage, and when it is determined whether the coil KL of the relay 12 has a short power supply, a short ground (short circuit to the ground), an open circuit or other faults, the control circuit eliminates the fault or issues an alarm to allow maintenance personnel to handle it, thereby improving the safety of the system.

[0079] It can be understood that the input end of the sampling circuit is connected between the output end of the driving circuit and the coil, and the output end of the sampling circuit is connected to the control circuit. The driving voltage output by the driving circuit is collected through the sampling circuit, and the driving voltage is transmitted to the control circuit, so that the control circuit performs fault diagnosis on the coil according to the driving voltage to determine whether the coil has faults such as short power supply, short ground, open circuit, etc., and when the coil has a fault, the control circuit can take corresponding measures to avoid further expansion of the fault, thereby improving the safety of the circuit.

[0080] In some embodiments, Figure 2 As shown, the driving circuit 102 may include a first driving unit 1021 and a second driving unit 1022 .

[0081] In the embodiment of the utility model, the first driving unit 1021 is connected between the first output end of the flyback transformer circuit 101 and the second end of the coil KL, and the second driving unit 1022 is connected between the second output end of the flyback transformer circuit 101 and the second end of the coil KL. It can be understood that the first input end of the driving circuit 102 is the input end of the first driving unit 1021, the first output end of the driving circuit 102 is the output end of the first driving unit 1021, the second input end of the driving circuit 102 is the input end of the second driving unit 1022, and the second output end of the driving circuit 102 is the output end of the second driving unit 1022.

[0082] Here, the first driving unit may be a high-side driver, and the second driving unit may be a low-side driver; or the first driving unit may be a low-side driver, and the second driving unit may be a high-side driver. That is, the driving circuit 102 may include a high-side driver and a low-side driver.

[0083] In a specific implementation, the first driving unit 1021 is a high-side driver, and the second driving unit 1022 is a low-side driver.

[0084] In some embodiments, Figure 2 As shown, the sampling circuit includes a first sampling unit 1041 and a second sampling unit 1042; wherein:

[0085] The input end of the first sampling unit 1041 is connected between the output end of the first driving unit 1021 and the first end of the coil KL, and the first sampling unit 1041 is configured to collect the first driving voltage output by the first driving unit 1021;

[0086] An input end of the second sampling unit 1042 is connected between an output end of the second driving unit 1022 and a second end of the coil KL. The second sampling unit 1042 is configured to collect a second driving voltage output by the second driving unit 1022 .

[0087] Here, the first sampling unit 1041 is connected between the first driving unit 1021 and the coil, and the first sampling unit 1041 collects the first driving voltage (for example, the high-side voltage) so that the control circuit diagnoses whether the coil KL has a short power supply, a short ground, an open circuit, or other faults according to the first driving voltage. The second collecting unit is connected between the second driving unit 1022 and the coil, and the second sampling unit 1042 collects the second driving voltage (the low-side voltage) so that the control circuit diagnoses whether the coil KL has a short power supply, a short ground, an open circuit, or other faults according to the second driving voltage; in addition, the grounding terminals of the first sampling unit 1041 and the second sampling unit 1042 are both connected to the ground. In this way, sampling and diagnosing the voltage at both ends of the coil of the relay can avoid system failures due to faults in the coil of the relay, thereby improving the reliability of the system.

[0088] In the embodiment of the utility model, the circuit structures of the first sampling unit 1021 and the second sampling unit 1022 are the same; or, the circuit structures of the first sampling unit 1021 and the second sampling unit 1022 are different. There is no specific limitation on this, as long as the first sampling unit 1021 and the second sampling unit 1022 can collect the voltage of the corresponding path.

[0089] Exemplarily, the circuit structures of the first sampling unit 1041 and the second sampling unit 1022 are the same. Figure 3 A schematic diagram of the composition structure of a sampling unit provided for an embodiment of the utility model. The first sampling unit 1041 may include a fourth resistor R4 and a fifth resistor R5; wherein the first end of the fourth resistor R4 is connected to the first output end of the driving short circuit, the second end of the fourth resistor R4 is respectively connected to the first end of the fifth resistor R5 and the control circuit, and the second end of the fifth resistor R5 is connected to the ground. Here, the second end of the fourth resistor R4 can be connected to the ADC port of the control circuit for converting the analog signal into a digital signal. It should be noted that the first sampling unit and the second sampling unit can be connected to different ADC ports of the control circuit, or can be connected to the same ADC port of the control circuit, depending on the actual situation. The control circuit determines whether the coil has faults such as short power supply, short ground, open circuit, etc. based on the first drive voltage or the second drive voltage, and alarms or eliminates the fault when the coil has a fault to improve the safety of the system.

[0090] Thus, in the embodiment of the utility model, the first sampling unit is connected between the output end of the first driving unit and the first end of the coil, and can collect the first driving voltage (e.g., high-side voltage) output by the first driving unit, so that the control circuit can diagnose whether the coil has a short power supply, a short ground (short circuit to ground), an open circuit, etc. faults according to the first driving voltage. The second sampling unit is connected between the output end of the second driving unit and the second end of the coil, and can collect the second driving voltage (e.g., low-side voltage) output by the second driving unit, so that the control circuit can diagnose whether the coil has a short power supply, a short ground (short circuit to ground), an open circuit, etc. faults according to the second driving voltage. And when there is a fault in the coil, the control circuit can take corresponding measures to prevent the fault from further expanding, thereby improving the safety of the circuit.

[0091] In some embodiments, continuing as Figure 2 As shown, the power supply circuit 11 includes a power supply unit 111 and a voltage conversion unit 112; wherein: the input end of the voltage conversion unit 112 is connected to the power supply unit 111, and the output end of the voltage conversion unit 112 is connected to the input end of the flyback transformer circuit 101; the voltage conversion unit 112 is configured to perform voltage conversion on the third voltage provided by the power supply unit 111 to generate a first voltage.

[0092] In the embodiment of the utility model, the power supply unit 111 may be a battery module, or a battery module. For example, in a vehicle-mounted system, the battery module may be a vehicle-mounted power supply, specifically a 12 volt (V) vehicle-mounted lead-acid power supply.

[0093] In some embodiments, the voltage conversion unit 112 may be a boost unit. In a specific implementation, the boost unit is a Boost circuit. Figure 4 The following is a schematic diagram of the structure of a voltage conversion unit provided by an embodiment of the utility model. Figure 4 As shown, the voltage conversion unit includes a first inductor L1, a second switch K2, a third diode D3 and a third capacitor C3. Wherein: the first end of the first inductor L1 is connected to the first end of the power supply unit, the second end of the first inductor L1 is respectively connected to the third diode D3 and the first end of the second switch K2; the second end of the third diode D3 is respectively connected to the first end of the third capacitor C3 and the first input end of the flyback transformer circuit; the second end of the second switch K2 is respectively connected to the second end of the power supply unit, the third capacitor C3 and the second input end of the flyback transformer circuit and the ground, and the control end of the second switch K2 is connected to the control circuit; the first end of the third capacitor C3 is also connected to the first input end of the flyback transformer circuit, and the second end of the third capacitor C3 is also connected to the second input end of the flyback transformer circuit.

[0094] In an embodiment of the utility model, the second switch K2 can be a MOS tube, and the control end of the second switch K2 can be connected to the GPIO interface of the control circuit. The second switch K2 is configured to receive a switch control signal sent by the control circuit and close or open according to the switch control signal to perform voltage conversion on the third voltage provided by the power supply unit to generate the first voltage.

[0095] In the embodiment of the utility model, the Boost circuit is mainly composed of a first inductor L1, a second switch K2, a third diode D3 and a third capacitor C3, and its working principle can be divided into two stages: a charging stage and a discharging stage. In the charging stage, the second switch K2 is in a closed state, and the current charges the third capacitor C3 through the first inductor L1 and the second switch K2. At this time, the output voltage of the Boost voltage is higher than the input voltage of the power supply unit; in the discharging stage, the second switch K2 is in an open state, and the first inductor L1 generates an induced electromotive force, which maintains the output voltage together with the third capacitor C3, so that the output voltage of the Boost circuit is further increased. In this way, by controlling the on and off of the second switch K2, the output voltage of the Boost circuit can be adjusted to meet the power supply requirements of the relay coil.

[0096] It should be noted that the voltage conversion unit of the embodiment of the present utility model is not limited to the Boost circuit, and can also be a charge pump (Charge Pump), or a boost transformer circuit, etc., which is determined according to actual conditions and is not specifically limited here.

[0097] In this way, the voltage conversion unit can convert the third voltage provided by the power supply unit, for example, boost the third voltage to meet the power supply demand of the coil. In addition, through the voltage conversion unit and the flyback transformer circuit, the power supply voltage supplied to the coil can be stabilized to avoid unexpected adhesion of the relay coil due to voltage drop, thereby improving the safety and stability of the circuit.

[0098] In some embodiments, continuing as Figure 2 As shown, the driving device 10 further includes a freewheeling circuit 105, and the freewheeling circuit 105 is connected in parallel to both ends of the coil.

[0099] In the embodiment of the utility model, the freewheeling circuit 105 can be a diode freewheeling circuit, a diode-resistor freewheeling circuit, or a voltage-stabilizing diode freewheeling circuit. Specifically, the freewheeling circuit 105 can be a freewheeling diode, which provides a freewheeling loop for the coil of the relay; the freewheeling diode connected in parallel at both ends of the relay coil can protect other components in the circuit from being broken down or damaged by the reverse electromotive force generated by the inductor, and improve the stability of the circuit.

[0100] That is to say, the freewheeling circuit is connected in parallel at both ends of the relay coil, and the freewheeling circuit can provide a freewheeling loop for the coil. For example, when the relay coil is powered off, the freewheeling circuit is turned on to form a closed loop, so that the current or voltage can continue to flow for a period of time, thereby avoiding sudden changes in current or voltage and improving the stability and safety of the circuit.

[0101] The embodiment of the utility model provides a driving device, which adopts a flyback transformer circuit to prevent surge current and interference in the power supply circuit (i.e., the power supply circuit of the coil), thereby stabilizing the power supply voltage; and adopts a feedback circuit to detect the output condition of the output end of the flyback transformer circuit, and feeds back the output condition to the control circuit through the feedback circuit, so that the control circuit adjusts the output of the flyback transformer according to the output condition, such as the output overvoltage or undervoltage of the flyback transformer circuit, and sends a control signal to the flyback transformer circuit to adjust the output voltage of the flyback transformer, so as to stabilize the power supply voltage for the coil, avoid unexpected adhesion of the relay coil due to voltage drop, etc., and thus improve the safety and stability of the circuit.

[0102] In another embodiment of the present invention, Figure 2 On the basis of Figure 5 A schematic diagram of the structure of a driving device provided in an embodiment of the utility model Figure 3 .like Figure 5 As shown, the flyback transformer circuit 101 includes a switch unit 1011 and a flyback transformer T, and the flyback transformer T includes a primary winding T1 and a secondary winding T2; wherein:

[0103] The non-same-name end of the primary winding T1 is connected to the first output end of the power supply circuit 11, and the same-name end of the primary winding T1 is connected to the first end of the switch unit 1011; the same-name end of the secondary winding T2 is connected to the first input end of the drive circuit 102, and the non-same-name end of the secondary winding T2 is connected to the second input end of the drive circuit 102; the second end of the switch unit 1011 is connected to the second output end of the power supply circuit 11, and the control end of the switch unit 1011 is connected to the control circuit;

[0104] The switch unit 1011 is configured to receive a control signal sent by the control circuit, and perform voltage conversion on the first voltage according to the control signal.

[0105] In an embodiment of the present invention, the flyback transformer may include a plurality of secondary windings. Figure 5 A secondary winding is shown. When there are multiple relays, the flyback transformer may include multiple secondary windings, and the output end of each secondary winding is connected to the drive circuit, the output end of the drive circuit is connected to the coil of the corresponding relay, and the output end of each flyback transformer is connected to the corresponding feedback circuit, and each coil is connected to the corresponding sampling unit. It can be understood that the circuit connected to each secondary winding and the relay path can be the same, so that the control circuit converts the first voltage through the feedback signal of the feedback circuit corresponding to each relay, so that the coil can be stably powered. It should also be noted that the output voltage of each secondary winding is the same.

[0106] It can be understood that the flyback transformer can convert the input voltage or current into the required output voltage or current, and can achieve electrical isolation between the input and output, prevent surge current and interference in the power supply circuit (i.e., the power supply circuit of the coil), thereby ensuring the safety of the circuit. Moreover, through the switching action of the switch unit, the on and off of the input current of the primary winding of the flyback transformer is controlled, thereby achieving efficient conversion and transfer of energy. For example, when the switch unit is closed, the input electric energy is stored in the primary winding of the flyback transformer; when the switch is turned off, the energy stored in the flyback transformer is released to the secondary winding to power the coil of the relay, which can avoid the problem of unstable power supply of the relay coil caused by a sudden drop in the power supply voltage, thereby improving the safety and reliability of the circuit.

[0107] In some embodiments, the switch unit 1011 includes a first switch K1, a first resistor R1 and a second resistor R2; wherein: the first end of the first resistor R1 is connected to the control circuit, and the second end of the first resistor R1 is respectively connected to the first end of the second resistor R2 and the control end of the first switch K1; the control end of the first switch K1 is also connected to the first end of the second resistor R2, and the first end of the first switch K1 is connected to the same end of the primary winding T1; the second end of the first switch K1 and the second end of the second resistor R2 are both connected to the ground; the first switch K1 is configured to receive a control signal sent by the control circuit, and pulse width modulate the first voltage according to the control signal.

[0108] In the embodiment of the utility model, the first switch K1 may be a MOS tube; the control circuit can stabilize the output voltage and ensure that the load is reliably powered by controlling the switching frequency and duty cycle of the first switch K1.

[0109] That is to say, the switching action of the first switch can not only control the transfer of energy, but also realize the voltage conversion. Specifically, by adjusting the closing and opening time of the first switch (i.e., the pulse width modulation duty cycle) according to the control signal, the turns ratio of the primary winding and the secondary winding of the flyback transformer can be changed, thereby realizing the regulation of the output voltage. In addition, the use of the first resistor and the second resistor can play a voltage dividing role on the control signal, and by grounding one end of the second resistor, a stable level state, such as a low level, can be provided for the control end of the first switch or the control pin of the control circuit. In this way, even if the external environmental factors change, the level state of the control end of the first switch or the control pin of the control circuit can also remain stable, thereby ensuring the safety of the circuit.

[0110] In some embodiments, the flyback transformer circuit 101 further includes an absorption unit 1012, and the absorption unit 1012 includes a third resistor R3, a first capacitor C1 and a first diode D1; wherein:

[0111] The first end of the third resistor R3 is respectively connected to the first output end of the power supply circuit 11 and the first end of the first capacitor C1, and the second end of the third resistor R3 is respectively connected to the cathode end of the first diode D1 and the second end of the first capacitor C1; the first end of the first capacitor C1 is also connected to the non-same-name end of the primary winding T1, and the second end of the first capacitor C1 is also connected to the cathode end of the first diode D1; the anode end of the first diode D1 is respectively connected to the first end of the first switch K1 and the same-name end of the primary winding T1.

[0112] In this way, the third resistor, the first capacitor and the first diode are used to form an absorption circuit. The absorption circuit can absorb the leakage inductance peak voltage generated when the first switch is turned off and convert it into electrical energy, thereby effectively reducing the electromagnetic interference in the first switch and protecting the first switch from voltage breakdown and overcurrent damage, thereby improving the safety of the circuit.

[0113] In some embodiments, continuing as Figure 5 As shown, the flyback transformer circuit 101 further includes a rectifier unit 1013, and the rectifier unit 1013 includes a second diode D2 and a second capacitor C2; wherein:

[0114] The anode terminal of the second diode D2 is connected to the same-name terminal of the secondary winding T2, and the cathode terminal of the second diode D2 is respectively connected to the first input terminal of the drive circuit 102 and the first end of the second capacitor C2; the first end of the second capacitor C2 is also connected to the first input terminal of the drive circuit 102, and the second end of the second capacitor C2 is respectively connected to the second input terminal of the drive circuit 102 and the ground.

[0115] In the embodiment of the utility model, the second diode D2 is a rectifier diode. In the secondary winding of the flyback transformer, when the first switch K1 is closed, an AC voltage is induced in the secondary winding through the flyback transformer T. This AC voltage is rectified by the second diode. Since the rectifier diode only allows the current of the positive half cycle to pass through, the AC voltage is converted into a DC voltage. And the rectifier diode, as part of the loop, allows the current to continue to flow, which can reduce the switching loss of the circuit and the harmonic amplitude of the secondary current, thereby improving the efficiency of the circuit.

[0116] That is to say, the second diode and the second capacitor form a rectifying unit. When the second diode converts the AC voltage output by the secondary winding of the flyback transformer into a DC voltage, the output voltage will fluctuate. The second capacitor in parallel can absorb these fluctuations, making the output voltage more stable and smooth, thereby stabilizing the power supply voltage to power the coil.

[0117] In some embodiments, Figure 5 On the basis of Figure 6 As shown, the feedback circuit 103 includes a current feedback unit 1031 and a current detection component 1032; wherein:

[0118] The current detection component 1032 is connected in series between the second input terminal of the driving circuit 102 and the non-same-name terminal of the secondary winding T2; the first input terminal of the current feedback unit 1031 is connected to the first terminal of the current detection component 1032, the second input terminal of the current feedback unit 1031 is connected to the second terminal of the current detection component 1032, and the output terminal of the current feedback unit 1031 is connected to the control circuit; the ground terminal of the current feedback unit 1031 is connected to the ground;

[0119] The current feedback unit 1031 is configured to detect the output current of the secondary winding T2, generate a current feedback signal, and transmit the current feedback signal to the control circuit.

[0120] In the embodiment of the utility model, the current detection component 1032 can be a sampling resistor, a Hall sensor, or a current transformer. In a specific embodiment, the current detection component 1032 is a sampling resistor.

[0121] In a specific embodiment, the current detection component 1032 is a sampling resistor, and the current feedback unit 1031 collects the voltage across the sampling resistor. Figure 7 The present invention provides a schematic diagram of the structure of a current feedback unit. Figure 7 As shown, the current feedback unit may include a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, and an operational amplifier U1. The first end of the eighth resistor R8 is connected to the first end of the current detection component, and the second end of the eighth resistor R8 is respectively connected to the first end of the sixth resistor R6 and the non-inverting input end of the operational amplifier U1; the first end of the sixth resistor R6 is also connected to the non-inverting input end of the operational amplifier U1, and the second end of the sixth resistor R6 is connected to the ground; the first end of the ninth resistor R9 is connected to the second end of the current detection component, and the second end of the ninth resistor R9 is respectively connected to the inverting input end of the operational amplifier U1 and the first end of the seventh resistor R7; the output end of the operational amplifier U1 is respectively connected to the control circuit and the second end of the seventh resistor R7.

[0122] Here, the operational amplifier component U1 may be a differential proportional operational amplifier. Here, the operational amplifier component U1 may be connected to an ADC port of the control circuit, and may share an ADC port with the first sampling unit and the second sampling unit, or the operational amplifier component U1, the first sampling unit and the second sampling unit may be connected to different ADC ports of the control circuit.

[0123] In the embodiment of the utility model, the differential proportional operational amplifier collects the voltage across the sampling resistor and feeds it back to the control circuit through the ADC port, so as to calculate the loop current, that is, the output current of the secondary winding.

[0124] In the embodiment of the present utility model, Figure 7 The current feedback unit shown is only an example, and the current feedback unit may also be other circuit structures as long as it can detect the output current of the secondary winding, which is not specifically limited here.

[0125] It can be understood that the current detection component is connected between the second input terminal of the driving circuit and the non-same-name terminal of the secondary winding, and the input terminal of the current feedback unit is connected to the current detection component, so that the output current of the secondary winding can be detected, and the generated current feedback signal is transmitted to the control circuit, so that the control circuit determines whether the output current of the secondary winding is abnormal (for example, overcurrent or undercurrent) according to the current feedback signal, and when the output current is abnormal, sends a control signal to the flyback transformer circuit to adjust the output of the flyback transformer, so as to stably supply power to the coil, avoid unexpected adhesion of the relay coil due to abnormal current, etc., and thereby improve the safety and stability of the circuit.

[0126] In some embodiments, continuing as Figure 6 As shown, the feedback circuit 103 further includes a voltage feedback unit 1033, wherein:

[0127] The input end of the voltage feedback unit 1033 is connected to the first output end of the driving circuit 102, and the output end of the voltage feedback unit 1033 is connected to the control circuit; the ground end of the voltage feedback unit 1033 is connected to the ground;

[0128] The voltage feedback unit 1033 is configured to detect the output voltage of the secondary winding T2, generate a voltage feedback signal, and transmit the voltage feedback signal to the control circuit.

[0129] In a specific embodiment, Figure 8 The following is a schematic diagram of the structure of a voltage feedback unit provided by an embodiment of the utility model. Figure 8 As shown, the voltage feedback unit may include a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, an output resistor Ro, a bias resistor Rb, an optical coupling component U2 and a voltage stabilizing component U3. The connection relationship of each component is as shown in FIG. Figure 8 It should be noted that the first ends of the twelfth resistor R12 and the thirteenth resistor R13 are both connected to the first output end of the driving circuit, and the feedback end (VFB) of the optical coupling component U2 is connected to the control circuit.

[0130] In the embodiment of the utility model, the optical coupling component U2 may include a light emitting diode and an optical coupling transistor (or photosensitive transistor). Here, the light emitting diode is responsible for converting the electrical signal into an optical signal, and the optical coupling transistor is responsible for converting the received optical signal back into an electrical signal. In this way, electrical isolation can be achieved between circuits through the optical coupling component U2, thereby improving the safety and stability of the circuit.

[0131] In the embodiment of the utility model, the voltage stabilizing component U2 can be a voltage stabilizing diode, and specifically, the voltage stabilizing component U2 can be TL431; when the output voltage of the secondary winding T2 increases, the reference sampling point of TL431 (such as Figure 8 The sampling voltage of the REF terminal of the voltage stabilizing component U3 shown in the figure will also increase, which will increase the conduction of TL431, and at the same time, the current flowing through the light-emitting diode of the optocoupler component U2 will also increase, thereby increasing the conduction of the optocoupler transistor of the optocoupler component U2, and reducing the voltage of the feedback terminal (VFB) connected thereto. Through the logic control inside the control circuit, the output duty cycle of the pin of the first switch is controlled to decrease, and the output voltage is also reduced. Conversely, when the output voltage of the secondary winding decreases, its working principle is the opposite.

[0132] In the embodiment of the utility model, if the voltage feedback signal of the voltage feedback unit indicates that the output voltage of the flyback transformer needs to be reduced, the PWM wave duty cycle of the first switch is adjusted through the control circuit to reduce the output voltage; if the voltage feedback signal of the voltage feedback unit indicates that the output voltage of the flyback transformer needs to be increased, the PWM wave duty cycle of the first switch is adjusted through the control circuit to increase the output voltage, thereby maintaining a stable power supply to the relay coil. Exemplarily, if the output voltage needs to be increased, the PWM wave duty cycle is increased.

[0133] In the embodiment of the present utility model, Figure 8 The voltage feedback unit shown is only an example, and the voltage feedback unit may also be other circuit structures as long as it can detect the output voltage of the secondary winding, which is not specifically limited here.

[0134] In this way, the input end of the voltage feedback unit is connected to the first output end of the driving circuit, and the output end of the voltage feedback unit is connected to the control circuit, so that the output voltage of the secondary winding can be detected, and the generated voltage feedback signal can be transmitted to the control circuit, so that the control circuit determines whether the output voltage of the secondary winding is abnormal (for example, undervoltage or overvoltage) according to the voltage feedback signal, and when the output voltage is abnormal, sends a control signal to the flyback transformer circuit to adjust the output voltage of the flyback transformer, so that the coil can be powered stably, avoiding unexpected adhesion of the relay coil due to abnormal current, etc., thereby improving the safety and stability of the circuit.

[0135] In another embodiment of the present utility model, based on the driving device of the above embodiment, Fig. 9 The following is a schematic diagram of the detailed structure of a driving device provided in an embodiment of the utility model. Fig. 9 As shown, the driving device may include a first resistor R1 to a fifteenth resistor R15, a sampling resistor RS, an output resistor Ro, a bias resistor Rb, a first diode D1, a second diode D2, a third diode D3, a freewheeling diode D4, a first switch K1, a second switch K2, a battery module B1, an operational amplifier component U1, an optical coupler component U2 and a voltage stabilizing component U3. The connection relationship of each device is as follows Fig. 9 As shown, no further elaboration is given here.

[0136] It should be noted that the control ends of the first switch K1 and the second switch K2 are connected to the GPIO interface of the control circuit for receiving control signals from the control circuit; ADC1, ADC2 and ADC2 are different ADC ports of the control circuit, that is, the first sampling unit, the second sampling unit and the current feedback unit are connected to different pins of the control circuit; the VFB end is connected to the control circuit, and the control circuit is used to receive the voltage signal fed back from the VFB end.

[0137] Here, the freewheeling diode D4 is the freewheeling circuit in the above embodiment, the battery module B1 is the power supply unit in the above embodiment, the sampling resistor Rs is the current detection component in the above embodiment, the high-side switch S1 is the first drive unit in the above embodiment, and the low-side switch S3 is the second drive unit in the above embodiment. Here, the sampling resistor has a small resistance and high precision, and the current feedback unit collects current through it; the high-side switch S1 and the low-side switch S2 can be switch tubes, such as MOS tubes, triodes, etc., which are controlled by IC; the freewheeling diode D4 provides a freewheeling circuit for the coil of the relay. In addition, the first drive unit is a high-side drive, and the second drive unit is a low-side drive; the battery module B1 can also be called a battery pack.

[0138] It should be noted that, here, only the switch components of the first drive unit and the second drive unit are connected. Fig. 9 As shown in FIG. 1 , the first driving unit and the second driving unit may further include a protection circuit, etc. Fig. 9 Not shown in FIG.

[0139] In the embodiment of the utility model, the detailed structure is composed of a boost unit (i.e., a voltage conversion unit), a flyback transformer circuit, a current feedback unit, a voltage feedback unit, a first sampling unit, and a second sampling unit. The boost unit and the flyback transformer circuit serve as a high-side drive and a low-side drive power supply control circuit, and PWM is used to adjust the output. The current feedback unit feeds back the output current of the output end of the flyback transformer to the input end, and the voltage feedback unit feeds back the output voltage of the output end of the flyback transformer to the input end. The first sampling unit collects the high-side voltage, and the second sampling unit collects the low-side voltage. In this way, when the battery module B1 (e.g., a vehicle-mounted lead-acid battery) drops abnormally, the voltage feedback unit at the output end of the flyback transformer feeds back the voltage feedback signal to the IC (i.e., the control circuit), and the IC controls the first switch K1 to adjust the PWM duty cycle according to the actual output voltage of the output end of the flyback transformer (e.g., overvoltage or undervoltage) to stabilize the output voltage of the output end of the flyback transformer, thereby avoiding unexpected adhesion of the relay coil due to voltage drop.

[0140] In the embodiment of the utility model, T is a flyback transformer, the left side (i.e., the primary winding) is the input end, and the right side (i.e., the secondary winding) is the output end; the third resistor R3, the first capacitor C1, and the first diode D1 constitute an RCD absorption circuit (i.e., an absorption unit) for absorbing the leakage inductance peak voltage generated when the first switch K1 is turned off. Here, the first switch K1 can be a MOS tube, and the first switch is controlled to generate a PWM wave through the GPIO interface of the IC; the second diode D2 and the second capacitor C2 constitute a rectifier circuit for rectifying the output of the output end of the secondary winding.

[0141] In some embodiments, the voltage conversion unit may be a boost unit, specifically a Boost circuit. Fig. 9 As shown, the Boost circuit includes a first inductor L1, a second switch K2, a third diode D3 and a third capacitor C3. Here, the first switch K2 can be a transistor.

[0142] In the embodiment of the utility model, the working principle of the Boost circuit can be divided into two stages: the charging stage and the discharging stage. In the charging stage, the second switch is in a closed state, and the current charges the third capacitor through the first inductor and the second switch. At this time, the output voltage of the Boost circuit is higher than the input voltage of the Boost circuit; in the discharging stage, the second switch is in an open state, and the first inductor generates an induced electromotive force, which maintains the output voltage together with the third capacitor, so that the output voltage is further increased, that is, by controlling the on and off of the second switch, the output voltage can be adjusted. In this way, the Boost circuit increases the power supply voltage and works together with the flyback transformer to stabilize the voltage.

[0143] In some embodiments, Fig. 9 As shown, the current feedback unit may include a sixth resistor R6 to a ninth resistor R9, and an operational amplifier component U1. Here, the operational amplifier component U1 may be a differential ratio operational amplifier.

[0144] In the embodiment of the utility model, the differential proportional operational amplifier collects the voltage across the sampling resistor Rs and feeds it back to the IC through the ADC3 port, thereby calculating the loop current (i.e., the output current at the output end of the flyback transformer). The IC determines whether the output current at the output end of the flyback transformer is abnormal based on the obtained loop current. If the output current at the output end of the flyback transformer is abnormal, the IC controls and adjusts the duty cycle of the PWM wave of the first switch so that the output current at the output end of the flyback transformer meets the power supply demand of the coil.

[0145] Here, the current feedback unit is responsible for collecting the current at the output end of the flyback transformer and feeding it back to the IC. If overcurrent or undercurrent occurs, the IC can control the first switch K1 to adjust the output or disconnect the relay circuit through the high-side switch S1 and / or the low-side switch S2.

[0146] In some embodiments, Fig. 9 As shown, the voltage feedback unit may include a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, an output resistor Ro, a bias resistor Rb, an optical coupling component U2 and a voltage stabilizing component U3. Here, the voltage stabilizing component U3 may be TL431.

[0147] In the embodiment of the utility model, when the output voltage of the secondary winding increases, the sampling voltage of the reference sampling point of TL431 will also increase, so that the conduction of TL431 increases, and the current flowing through the light-emitting diode in the optocoupler component U2 also increases, thereby increasing the conduction of the optocoupler transistor in the optocoupler component U2, and reducing the voltage of the feedback terminal (VFB) connected thereto. Through the logic control inside the control circuit, the output duty cycle of the pin controlling the first switch is reduced, and the output voltage is also reduced. Conversely, when the output voltage of the secondary winding decreases, its working principle is opposite.

[0148] In this way, the voltage feedback unit is responsible for collecting the voltage at the output end of the flyback transformer and feeding it back to the IC. If overvoltage or undervoltage occurs, the IC can control the first switch K1 to adjust the output or disconnect the relay circuit through the high-side switch S1 and / or the low-side switch S2.

[0149] In some embodiments, Fig. 9 As shown, the first sampling unit includes a fourth resistor R4 and a fifth resistor R5, and the second sampling unit includes a fourteenth resistor R14 and a fifteenth resistor R15.

[0150] In the embodiment of the utility model, the first sampling unit is used as an example to illustrate that the fourth resistor R4 and the fifth resistor R5 are used to perform resistance voltage division to achieve sampling. The first sampling circuit can also use voltage division sampling or operational amplifier sampling, which is not specifically limited.

[0151] In a specific embodiment, Fig.10 The following is a schematic diagram of an application scenario of a driving device provided by an embodiment of the utility model. The circuit described above will not be elaborated here. It should be noted that, Fig.10As shown, if multiple relays are included, such as the first relay 12A, ..., the Nth relay 12N; then the secondary winding includes multiple, such as the first secondary winding T2A, ..., the Nth secondary winding T2N; the first sampling unit includes multiple, such as the first sampling unit A, ..., the first N sampling unit N; the second sampling unit includes multiple, such as the second sampling unit A, ..., the second N sampling unit N; the current feedback unit includes multiple, such as the first current feedback unit A, ..., the Nth current feedback unit; the voltage feedback unit includes multiple, such as the first voltage feedback unit A, ..., the Nth voltage feedback unit; the freewheeling diode also includes multiple, the rectifier unit also includes multiple, and the current detection component also includes multiple, and no further elaboration is given. It can be understood that if there are multiple relays, the output end of the flyback transformer can have multiple outputs, and the number of outputs is determined according to actual conditions. In addition, the circuit on the path between each relay and the flyback transformer can be the same, so that the coil of each relay can be stably powered, avoiding the problem of system failure caused by unstable power supply of the relay coil. Here, N is a positive integer, and the value of N is determined according to actual conditions and is not limited thereto.

[0152] The embodiment of the utility model provides a driving device, specifically a high-side and low-side driving circuit based on a flyback transformer. The above embodiment is used to elaborate on the specific implementation of the above embodiment. It can be seen that when the on-board lead-acid battery drops abnormally, the voltage feedback unit at the output end of the flyback transformer feeds back the voltage to the IC. The IC controls the first switch to adjust the PWM wave duty cycle according to the actual output voltage condition (overvoltage / undervoltage) of the output end to stabilize the voltage at the output end, thereby avoiding unexpected adhesion of the relay coil due to voltage drop. In addition, the use of a flyback transformer can play the role of isolating the topology to prevent circuit surges and interference, and then can accurately adjust the output through the feedback loop and PWM to stabilize the supply voltage.

[0153] In yet another embodiment of the present invention, based on the same inventive concept as the above-mentioned embodiment, Fig.11 The following is a schematic diagram of the structure of an electric drive device provided in an embodiment of the utility model. Fig.11 As shown, the electric drive device 110 may include a drive device 10 , a relay 12 , and a control circuit 13 as described in any one of the aforementioned embodiments.

[0154] In some embodiments, the control circuit 13 is configured to receive a voltage feedback signal sent by a voltage feedback unit in the driving device 10, detect whether the output voltage of the flyback transformer in the driving device 10 is abnormal based on the voltage feedback signal, and send a control signal to the switching unit in the driving device 10 when it is determined that the output voltage of the flyback transformer is abnormal, so that the switching unit performs voltage conversion on the first voltage provided by the power supply circuit based on the control signal.

[0155] In some embodiments, the control circuit 13 is also configured to receive a current feedback signal sent by a current feedback unit in the driving device 10, detect whether the output current of the flyback transformer in the driving device 10 is abnormal based on the current feedback signal, and send a control signal to the switching unit in the driving device 10 when it is determined that the output current of the flyback transformer is abnormal, so that the switching unit performs voltage conversion on the first voltage provided by the power supply circuit based on the control signal.

[0156] In some embodiments, the control circuit 13 is further configured to receive a driving voltage sent by a sampling circuit in the driving device 10 , and perform fault diagnosis on the coil in the relay 12 based on the driving voltage.

[0157] It should be noted that the electric drive device can be used in a BMS or a battery pack equipped with a BMS. In this way, the relay coil can be stably powered by the BMS. In a specific embodiment, the electric drive device is used in a vehicle-mounted scenario with a BMS. Exemplarily, the electric drive device is used in new energy vehicles, such as electric vehicles, which are not specifically limited here.

[0158] The description of the above electric drive device embodiment is similar to the description of the above device embodiment, and has similar beneficial effects as the device embodiment. For technical details not disclosed in the electric drive device embodiment of the utility model, please refer to the description of the device embodiment of the utility model for understanding.

[0159] It should be noted that, in the present utility model, the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, product or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, product or device. In the absence of further restrictions, an element defined by the sentence "includes a ..." does not exclude the existence of other identical elements in the process, method, product or device including the element.

[0160] In the several embodiments provided by the present utility model, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. The device embodiments described above are only schematic. For example, the division of units is only a logical function division. There may be other division methods in actual implementation, such as: multiple units or components can be combined, or can be integrated into another system, or some features can be ignored or not executed. In addition, the coupling, direct coupling, or communication connection between the components shown or discussed can be through some interfaces, and the indirect coupling or communication connection of devices or units can be electrical, mechanical or other forms.

[0161] The units described above as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units; they may be located in one place or distributed on multiple network units; some or all of the units may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. In addition, in each embodiment of the utility model, each functional unit may be fully integrated into one processing unit, or each unit may be separately used as a unit, or two or more units may be integrated into one unit; the above integrated units may be implemented in the form of hardware or in the form of hardware plus software functional units.

[0162] The above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A driving device, characterized in that: The driving device comprises a flyback transformer circuit, a driving circuit and a feedback circuit; wherein: The input end of the flyback transformer circuit is connected to the power supply circuit, the output end of the flyback transformer circuit is connected to the input end of the feedback circuit, and the output end of the feedback circuit is connected to the control circuit; The flyback transformer circuit is configured to receive a control signal provided by the control circuit, and perform voltage conversion on a first voltage provided by the power supply circuit according to the control signal to generate a second voltage; The output end of the flyback transformer circuit is also connected to the input end of the drive circuit, and the output end of the drive circuit is connected to the coil of the relay. The drive circuit is configured to provide the second voltage to the coil to close the contacts of the relay.

2. The driving device according to claim 1, characterized in that: The flyback transformer circuit includes a switch unit and a flyback transformer, and the flyback transformer includes a primary winding and a secondary winding; wherein: The non-same-name end of the primary winding is connected to the first output end of the power supply circuit, and the same-name end of the primary winding is connected to the first end of the switch unit; the same-name end of the secondary winding is connected to the first input end of the drive circuit, and the non-same-name end of the secondary winding is connected to the second input end of the drive circuit; the second end of the switch unit is connected to the second output end of the power supply circuit, and the control end of the switch unit is connected to the control circuit; The switch unit is configured to receive a control signal sent by the control circuit, and perform voltage conversion on the first voltage according to the control signal.

3. The driving device according to claim 2, characterized in that: The switch unit comprises a first switch, a first resistor and a second resistor; wherein: The first end of the first resistor is connected to the control circuit, the second end of the first resistor is connected to the first end of the second resistor and the control end of the first switch respectively; the control end of the first switch is also connected to the first end of the second resistor, the first end of the first switch is connected to the same end of the primary winding; the second end of the first switch and the second end of the second resistor are both connected to the ground; The first switch is configured to receive a control signal sent by the control circuit, and perform pulse width modulation on the first voltage according to the control signal.

4. The driving device according to claim 3, characterized in that: The flyback transformer circuit further includes an absorption unit, and the absorption unit includes a third resistor, a first capacitor and a first diode; wherein: The first end of the third resistor is respectively connected to the first output end of the power supply circuit and the first end of the first capacitor, and the second end of the third resistor is respectively connected to the cathode end of the first diode and the second end of the first capacitor; the first end of the first capacitor is also connected to the non-same-name end of the primary winding, and the second end of the first capacitor is also connected to the cathode end of the first diode; the anode end of the first diode is respectively connected to the first end of the first switch and the same-name end of the primary winding.

5. The driving device according to claim 2, characterized in that: The flyback transformer circuit further includes a rectifier unit, and the rectifier unit includes a second diode and a second capacitor; wherein: The anode terminal of the second diode is connected to the same-name terminal of the secondary winding, and the cathode terminal of the second diode is respectively connected to the first input terminal of the drive circuit and the first end of the second capacitor; the first end of the second capacitor is also connected to the first input terminal of the drive circuit, and the second end of the second capacitor is respectively connected to the second input terminal of the drive circuit and the ground.

6. The driving device according to claim 2, characterized in that: The feedback circuit comprises a current feedback unit and a current detection component; wherein: The current detection component is connected in series between the second input terminal of the drive circuit and the non-same-name terminal of the secondary winding; the first input terminal of the current feedback unit is connected to the first terminal of the current detection component, the second input terminal of the current feedback unit is connected to the second terminal of the current detection component, and the output terminal of the current feedback unit is connected to the control circuit; The current feedback unit is configured to detect the output current of the secondary winding, generate a current feedback signal, and transmit the current feedback signal to the control circuit.

7. The driving device according to claim 2 or 6, characterized in that: The feedback circuit further comprises a voltage feedback unit, wherein: The input end of the voltage feedback unit is connected to the first output end of the driving circuit, and the output end of the voltage feedback unit is connected to the control circuit; the voltage feedback unit is configured to detect the output voltage of the secondary winding, generate a voltage feedback signal, and transmit the voltage feedback signal to the control circuit.

8. The driving device according to any one of claims 1 to 6, characterized in that: The driving device also includes a sampling circuit; wherein: The output end of the sampling circuit is connected to the control circuit, and the input end of the sampling circuit is connected between the output end of the drive circuit and the coil; the sampling circuit is configured to collect the drive voltage output by the drive circuit and transmit the drive voltage to the control circuit; the control circuit is configured to perform fault diagnosis on the coil based on the drive voltage.

9. The driving device according to claim 8, characterized in that: The driving circuit includes a first driving unit and a second driving unit, and the sampling circuit includes a first sampling unit and a second sampling unit; wherein: The input end of the first sampling unit is connected between the output end of the first driving unit and the first end of the coil, and the first sampling unit is configured to collect a first driving voltage output by the first driving unit; An input end of the second sampling unit is connected between an output end of the second driving unit and a second end of the coil, and the second sampling unit is configured to collect a second driving voltage output by the second driving unit.

10. The driving device according to any one of claims 1 to 6, characterized in that: The power supply circuit comprises a power supply unit and a voltage conversion unit; wherein: The input end of the voltage conversion unit is connected to the power supply unit, and the output end of the voltage conversion unit is connected to the input end of the flyback transformer circuit; the voltage conversion unit is configured to perform voltage conversion on the third voltage provided by the power supply unit to generate the first voltage.

11. The driving device according to any one of claims 1 to 6, characterized in that: The driving device further includes a freewheeling circuit, and the freewheeling circuit is connected in parallel to both ends of the coil.

12. An electric drive device, characterized in that: The electric drive device comprises a relay, a control circuit and a drive apparatus according to any one of claims 1 to 11.

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