Pre-driving device for driving circuit high-side diagnosis, driving circuit, system and controller

Abstract

The utility model provides a pre-drive device, a drive circuit, a system and a vehicle controller for high-side diagnosis of the drive circuit. The pre-driving device comprises pre-driving units in one-to-one correspondence with the low-side circuits, each pre-driving unit comprises a pre-driving leakage current module and a controllable current source module, the first end of each pre-driving leakage current module receives driving voltage, and the low-side connection load end of each low-side circuit is coupled to the second end of the corresponding pre-driving leakage current module. The first end and the second end of the controllable current source module are respectively coupled with the corresponding low-side connection load end and grounded; and the controllable current source module is used for providing a discharge path for the leakage current of the pre-drive leakage current module. According to the utility model, the high-side diagnosis circuit can be effectively prevented from misreporting short power supply faults, the power consumption of the high-side diagnosis circuit is effectively reduced, and the area and the design cost of a PCB (Printed Circuit Board) are obviously reduced.

Description

Technical Field

[0001] This utility model relates to the field of vehicle control technology, and in particular to a pre-drive device, drive circuit, solenoid valve system and vehicle controller for high-side diagnostics of drive circuits. Background Technology

[0002] For safety reasons, the drive circuits for many loads in vehicle electrical systems typically include both high-side and low-side circuits. For example, regarding solenoid valves, please refer to [link to relevant documentation]. Figure 1 , Figure 1 This is an example diagram of a drive circuit commonly used in solenoid valves in related technologies. From... Figure 1 As can be seen, in this example, the drive circuit includes a high-side circuit 1, a high-side diagnostic circuit 2, and a low-side circuit 3. Before controlling the solenoid valve 4, the high-side switch of the high-side circuit 1 (not shown in the figure) must be opened first. To ensure the safety of the output state of the high-side circuit 1, short-power and short-ground diagnostics must be performed with the high-side circuit 1 closed. If a fault occurs, the high-side circuit 1 should be opened again after the fault is cleared. Specifically, this is usually done through the pull-up power supply of the high-side diagnostic circuit 2 (…). Figure 1 The pull-up power supply is not explicitly labeled; V0 represents the output voltage of the pull-up power supply. A resistor divider circuit (exemplarily, such as...) Figure 1 The resistors R01, R02, and R03 connected in series sample the high-side output voltage. The vehicle's ECU (Electronic Control Unit) uses the sampled voltage to determine whether a short circuit fault has occurred in high-side circuit 1. Since the high-side output is connected through a load (e.g., ...), Figure 1 The solenoid valve 4 in the high-side diagnostic circuit 2 is connected to the low-side circuit 3. Therefore, when designing the high-side diagnostic circuit 2, the influence of the structure or leakage current parameters of the low-side circuit 3 must also be considered. However, in some high-frequency, high-current applications, in order to drive the power switching devices (such as...) in the low-side circuit 3... Figure 1 In the case of MOSFETs T1 and T2, a pre-driver chip (not shown in the figure) with an internal charge pump is often used. When the pre-driver chip is not in the drive output state, it outputs a leakage current of several hundred μA from the low-side connection to the load terminal LN01. This leakage current is transmitted through the body diode of the power switching device in the low-side circuit 3 and the pull-down voltage divider circuit of the high-side diagnostic circuit 2 (e.g., ...). Figure 1 The resistors R02 and R03 in the circuit establish a current-carrying loop. If the voltage generated at the load terminal HN01 on the high side is close to or even higher than the battery voltage VBAT, the high side circuit 1 will be falsely reported as having a short power supply fault when it is in the off state, which will prevent the high side switch from being turned on.

[0003] To solve the above problems, such as Figure 1As shown, a small resistance R04 is often connected in parallel with the pull-down voltage dividing circuit in the related art, and this design will cause the leakage current generated by the pre-driver chip to flow through the resistance R04, thereby clamping the voltage of the high-side connection load end HN01 below the battery voltage VBAT. However, in actual applications, a high-side circuit 1 often supplies power to multiple loads, that is, one high-side circuit 1 corresponds to multiple low-side circuits 3. The more the number of low-side circuits 3, the greater the leakage current generated, and thus a resistance R04 with a smaller resistance value is required to be designed. The smaller the resistance value of the resistance R04, the greater the current flowing through the resistance R04 after the high-side circuit 1 is turned on, thereby increasing the power consumption of the resistance R04, and thus a resistance R04 with a larger rated power needs to be designed. In circuit design, a larger package or multiple resistances in parallel are often selected to increase the rated power consumption of the resistance R04, and both the larger package and the multiple resistances in parallel will increase the area and design cost of the PCB.

[0004] It should be noted that the information disclosed in the background art section of the utility model is only intended to deepen the understanding of the general background art of the utility model, and should not be regarded as acknowledging or implying in any form that the information constitutes prior art known to those skilled in the art. Content of the utility model

[0005] The utility model aims at providing a pre-driver device for high-side diagnosis of a drive circuit, a drive circuit, a solenoid valve system and a vehicle controller, which can effectively avoid false reporting of short power supply failure by the high-side diagnosis circuit, effectively reduce the power consumption of the high-side diagnosis circuit, significantly reduce the area and design cost of the PCB, and has simple logic and is easy to implement.

[0006] In order to achieve the above-mentioned purpose, the utility model realizes through the following technical scheme, a pre-driver device for high-side diagnosis of a drive circuit, the drive circuit includes a high-side circuit, a high-side diagnosis circuit and at least one low-side circuit, and the drive circuit is used for driving at least one load;The high-side diagnosis circuit is coupled to the high-side connection load end of the high-side circuit, and the high-side connection load end is used for coupling the voltage input end of the load;The low-side connection load end of each low-side circuit is used for connecting the ground end of the load corresponding thereto;The pre-driver device includes a pre-driver unit corresponding to the low-side circuit one by one, and the pre-driver unit includes a pre-driver leakage current module and a controllable current source module;The first end of the pre-driver leakage current module is used for receiving a driving voltage, the low-side connection load end of each low-side circuit is respectively coupled to the second end of the pre-driver leakage current module corresponding thereto and the first end of the controllable current source module, and the second end of the controllable current source module is grounded;The controllable current source module is used for providing a discharge path for the leakage current of the pre-driver leakage current module.

[0007] Optionally, the control terminal of the controllable current source is configured to receive an enable signal, and the enable signal is a first signal before the high-side diagnostic circuit is diagnosed and is a second signal after the high-side diagnostic circuit is diagnosed; and the controllable current source module is configured to provide a discharge path for the leakage current of the pre-driving leakage current module, and includes:

[0008] The controllable current source module is configured to be in a conducting state when the enable signal is the first signal, and is in a non-conducting state when the enable signal is the second signal.

[0009] Optionally, the pre-driving leakage current module includes a first current source, a first terminal of the first current source is configured to receive a driving voltage, and a second terminal of the first current source is coupled to the low-side connection load terminal of the low-side circuit corresponding to the pre-driving leakage current module.

[0010] Optionally, the controllable current source module includes an enable switch and a second current source, a first terminal of the enable switch is coupled to the low-side connection load terminal of the low-side circuit corresponding to the enable switch, a second terminal of the enable switch is coupled to a first terminal of the second current source, a second terminal of the second current source is grounded, and a control terminal of the enable switch is configured to receive the enable signal.

[0011] The enable switch is configured to be in a conducting state when the enable signal is the first signal, and is in a non-conducting state when the enable signal is the second signal.

[0012] Optionally, the minimum current that can be transmitted by the second current source is not less than the maximum value of the leakage current of the pre-driving leakage current module.

[0013] To achieve the above object, the utility model also provides a kind of drive circuit, and the drive circuit includes high-side circuit, high-side diagnostic circuit, at least one low-side circuit and any one of the pre-driving device described above, the pre-driving unit of the pre-driving device corresponds to the low-side circuit one by one.

[0014] Optionally, the drive circuit further includes a charge pump for generating the driving voltage, and an output terminal of the charge pump is coupled to a first terminal of each of the pre-driving leakage current modules.

[0015] Optionally, the low-side circuit includes a first switch tube and a second switch tube, a first terminal of the first switch tube is coupled to a first power supply, a second terminal of the first switch tube and a first terminal of the second switch tube are coupled to a low-side connection load terminal of the low-side circuit, a second terminal of the second switch tube is grounded, and a control terminal of the first switch tube and a control terminal of the second switch tube are respectively coupled to an output terminal of the pre-driving unit corresponding thereto.

[0016] Optionally, the driving voltage is greater than an output voltage of the first power supply.

[0017] Optionally, the high-side diagnostic circuit comprises a pull-up power module and a pull-down voltage dividing circuit, the pull-down voltage dividing circuit comprises a first resistor and a second resistor, a first end of the pull-up power module is used for coupling a second power supply, a second end of the pull-up power module and a first end of the first resistor are coupled to the high-side connected load end, a second end of the first resistor and a first end of the second resistor are commonly connected to a voltage sampling point, and a second end of the second resistor is grounded.

[0018] In order to achieve the above-mentioned purpose, the utility model still provides a kind of solenoid valve system, the solenoid valve system includes at least one solenoid valve and any one of the above-mentioned drive circuit, the voltage input end of at least one the solenoid valve is coupled the high-side connected load end of the drive circuit, and the ground terminal of the solenoid valve is coupled one of the low-side connected load end of the drive circuit.

[0019] In order to achieve the above-mentioned purpose, the utility model still provides a kind of vehicle controller, the vehicle controller includes any one of the above-mentioned drive circuit or the solenoid valve system of above.

[0020] Compared with prior art, the utility model provides a kind of for driving circuit high-side diagnosis pre-drive device, driving circuit, solenoid valve system and vehicle controller, with following advantages:

[0021] The utility model provides a drive circuit high side diagnosis's pre drive device, the drive circuit includes high side circuit, high side diagnosis circuit and at least one low side circuit, the drive circuit is used for driving at least one load, the high side diagnosis circuit is coupled high side connection load end of high side circuit, high side connection load end is used for coupling voltage input end of load, the low side connection load end of each low side circuit is used for connecting the ground end of load corresponding with it, the pre drive device has with the low side circuit one to one's pre drive unit, the pre drive unit includes pre drive leakage current module and controllable current source module, the first end of pre drive leakage current module is used for receiving drive voltage, the low side connection load end of each low side circuit is coupled respectively with the second end of pre drive leakage current module corresponding with it and the first end of controllable current source module, the second end of controllable current source module is grounded, controllable current source module is used for providing the leakage path of the leakage current of pre drive leakage current module, thereby, through controllable current source module, can provide the leakage path of the leakage current of pre drive leakage current module, under the joint action of high side diagnosis circuit and low side circuit, can make the voltage of high side connection load end lower than battery voltage, thereby effectively avoid high side diagnosis circuit false alarm short power supply failure. Further, compared with the related art of parallel connection of a small resistance value resistance for the pull-down voltage dividing circuit of high side diagnosis circuit, the utility model can also effectively reduce the power consumption of high side diagnosis circuit, significantly reduce the area of PCB and design cost.

[0022] Further, the control end of the controllable current source module can receive an enable signal, and the enable signal is a first signal before the high side diagnosis circuit diagnoses (that is, before the high side circuit is turned on), the controllable current source module is in an on state, and the leakage path of the leakage current of the pre drive leakage current module is provided, so that, under the joint action of the high side diagnosis circuit and the low side circuit, the voltage of the high side connection load end can be lower than the battery voltage, thereby effectively avoiding false alarm of the high side diagnosis circuit short power supply failure. Further, the enable signal is a second signal after the high side diagnosis circuit diagnoses (that is, after the high side circuit is turned on), and the controllable current source module is in an off state, thereby cutting off the additional circuit consumption due to the on state of the controllable current source module when the drive circuit is working normally, thereby effectively reducing the power consumption; and the logic is simple and easy to implement.

[0023] Since the driving circuit, the electromagnetic valve system and the vehicle controller provided by the utility model and the pre-driving device for high-side diagnosis of the driving circuit provided by the utility model belong to the same utility model concept, the driving circuit, the electromagnetic valve system and the vehicle controller provided by the utility model at least have all the advantages of the pre-driving device provided by the utility model, and the detailed content of the beneficial effects of the driving circuit, the electromagnetic valve system and the vehicle controller provided by the utility model is described in the foregoing related description of the beneficial effects of the pre-driving device provided by the utility model, and will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is an example diagram of the driving circuit for the electromagnetic valve in the related art;

[0025] Figure 2 It is an example diagram of the pre-driving device provided by the utility model for the driving circuit;

[0026] Figure 3 It is a specific example diagram of the pre-driving device provided by one of the embodiments of the utility model for the electromagnetic valve system;

[0027] Among them, the reference signs are as follows:

[0028] Driving circuit - 100;

[0029] High-side circuit - 1, 110; high-side diagnosis circuit - 2, 120, resistance - R01, R02, R03, R04, pull-up power module - 121, pull-down voltage division circuit - 122, first resistance - R1, second resistance - R2, third resistance - R3, diode - Z1; low-side circuit - 3, 131, 132, 13N, MOS tube - T1, T2, first switch tube - T 11 , T 21 , T N1 , second switch tube - T 12 , T 22 , T N2 ; low-side connection load end - LN01, LN1, LN2, LN N ; high-side connection load end - HN01, HN2; electromagnetic valve - 4, SNV1, SNV2, SNV N ; battery voltage - VBAT, driving voltage - VCP;

[0030] Charge pump - 140;

[0031] Load - 200;

[0032] Pre-driving device - 300, pre-driving unit - 301, 302, 30N, pre-driving leakage current module - 311, 312, 31N, first current source - I 11 , I12 1N Controllable current source module - 321, 322, 32N, enabling switch - K1, K2, K N Second current source - I 21 22 2N DETAILED DESCRIPTION

[0033] The pre-driving device for high-side diagnosis of a driving circuit, the driving circuit, the electromagnetic valve system and the vehicle controller of the present application will be further described in detail below in conjunction with the accompanying drawings. The advantages and features of the present application will be more apparent according to the following description. It should be noted that the drawings are very simplified and all use non-precise proportions, only for the purpose of facilitating and clarifying the purpose of assisting the description of the embodiments of the present application. In order to make the purpose, features and advantages of the present application more apparent and easy to understand, please refer to the accompanying drawings. It should be noted that the structure, proportion, size and the like shown in the drawings of the present application are only used to cooperate with the content disclosed in the specification, so that those skilled in the art can understand and read, and are not used to limit the conditions of the implementation of the present application. Any modification of structure, change of proportion relationship or adjustment of size, as long as it is the same or similar to the effect and purpose that can be achieved by the present application, should still fall within the scope of the technical content disclosed by the present application. The specific design features of the present application disclosed in this paper include, for example, specific dimensions, directions, positions and shapes, which will be determined partly by the specific application and use environment. In addition, in the following embodiments, sometimes the same reference signs are used to represent the same parts or parts with the same function between different drawings, and the repeated description is omitted. In the present specification, similar signs and letters are used to represent similar items, so once an item is defined in one drawing, it does not need to be further discussed in the subsequent drawings.

[0034] ​​​​It should be noted that the relational terms herein such as first and second and the like are used solely to distinguish one from another entity or action without necessarily requiring or implying any actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element. The singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise. The term "or" is generally employed in its sense including "and / or" unless the context clearly dictates otherwise. The term "and / or" means "and" or "or", and the disjunctive "or" in these instances generally means "and / or", so that, for example, a condition A or B is satisfied by any one of the following: A is true (or present) and B is false (or not present), A is false (or not present) and B is true (or present), and A and B are both true (or present). The term "at least two" generally means "two or more" unless the context clearly dictates otherwise. The terms "first", "second", "third", etc. are used only to describe a possible order and not to indicate or imply a relative importance or an indication of the number of technical features indicated.

[0035] The core idea of the utility model lies in providing a kind of pre-drive device for driving circuit high side diagnosis, driving circuit, solenoid valve system and vehicle controller, the utility model can effectively reduce the power consumption of high side diagnosis circuit, significantly reduce the area and design cost of PCB, and the logic is simple, easy to implement while effectively avoiding high side diagnosis circuit false alarm short power supply fault.

[0036] It should be noted that the pre-drive device provided by the utility model can be applied to the driving circuit provided by the utility model, the pre-drive device and the driving circuit provided by the utility model can be applied to the solenoid valve system provided by the utility model, and the pre-drive device, the driving circuit and the solenoid valve system provided by the utility model can be applied to the vehicle controller provided by the utility model. The pre-drive device for driving circuit high side diagnosis, driving circuit, solenoid valve system and vehicle controller provided by the utility model can be applied to vehicle. It should be understood that the term "vehicle" or "vehicle" or other similar terms used herein include general motor vehicles, such as passenger vehicles including sport utility vehicles (SUV), buses, trucks, various commercial vehicles, and include hybrid vehicles, electric vehicles, plug-in hybrid electric vehicles, fuel cell vehicles and other alternative fuel vehicles (such as fuel obtained from resources other than oil).

[0037] In order to realize the above core idea, the utility model provides a kind of pre-drive device for driving circuit high side diagnosis.Exemplarily, please see Figure 2, Figure 2 The pre-driving device for driving circuit is provided by the utility model. From Figure 2 It can be seen that the driving circuit 100 includes a high-side circuit 110, a high-side diagnostic circuit 120, and at least one low-side circuit 131, 132, …, 13N, the driving circuit 100 is used for driving at least one load 200; the high-side diagnostic circuit 120 is coupled to the high-side load connection end HN2 of the high-side circuit 110, the high-side load connection end HN2 is used for coupling the voltage input end (not marked in the figure) of the load 200, and the low-side load connection end LN1, LN2, …, LN N is used for connecting the ground end of the load 1, 2, …, N corresponding thereto; the pre-driving device 300 includes a pre-driving unit 301, 302, …, 30N corresponding to the low-side circuit 131, 132, …, 13N, the pre-driving unit 301, 302, …, 30N includes a pre-driving leakage current module 311, 312, …, 31N and a controllable current source module 321, 322, …, 32N, the first end of each pre-driving leakage current module 311, 312, …, 31N is used for receiving a driving voltage VCP, and the low-side load connection end LN1, LN2, …, LN N The second end of the pre-driving leakage current module 311, 312, …, 31N corresponding thereto and the first end of the controllable current source module 321, 322, …, 32N are coupled, respectively, and the second end of the controllable current source module 321, 322, …, 32N is grounded. The controllable current source module 321, 322, …, 32N is used for providing a discharge path for the leakage current of the pre-driving leakage current module 311, 312, …, 31N.

[0038] The pre-driving device 300 for high-side diagnosis of the driving circuit has one-to-one correspondence between the pre-driving units 301, 302,..., 30N and the low-side circuits 131, 132,..., 13N, the pre-driving units 301, 302,..., 30N include controllable current source modules 321, 322,..., 32N, and the controllable current source modules 321, 322,..., 32N can provide a discharge path for the leakage current of the pre-driving leakage current modules 311, 312,..., 31N, so that, under the joint action of the high-side diagnosis circuit 120 and the low-side circuits 131, 132,..., 13N, the voltage of the high-side connection load end HN2 is lower than the battery voltage VBAT, thereby effectively avoiding false reporting of short power supply failure of the high-side diagnosis circuit 120. Further, compared with the related art of connecting a small resistance in parallel with the pull-down voltage division circuit 122 of the high-side diagnosis circuit 120, the pre-driving device 300 can effectively reduce the power consumption of the high-side diagnosis circuit 120, significantly reduce the area of the PCB and the design cost.

[0039] It should be noted that the number of the pre-driving units is not limited, and the number of the pre-driving units can be one, two or more. Further, the specific type of the load 200 is not limited, for example, the load 200 includes but is not limited to solenoid valves, steering assist pumps and PTC heaters, etc. In order to facilitate understanding and description, the pre-driving device provided by the utility model is described by taking the solenoid valve as an example. Figure 3

[0040] Preferably, in some exemplary embodiments, the control end of the controllable current source module 321, 322,..., 32N is used to receive an enable signal, and the enable signal is a first signal before the high-side diagnosis circuit 120 is diagnosed and is a second signal after the high-side diagnosis circuit 120 is diagnosed. Further, the controllable current source module 321, 322,..., 32N is used to provide a discharge path for the leakage current of the pre-driving leakage current module 311, 312,..., 31N, and the controllable current source module 321, 322,..., 32N is configured to be in a conduction state when the enable signal is the first signal, and is in an off state when the enable signal is the second signal.

[0041] ​Therefore, the control terminals of the controllable current source modules 321, 322, ..., 32N can receive enable signals, and the enable signal is the first signal before the high-side diagnostic circuit 120 diagnoses (that is, before the high-side circuit 110 is turned on). The controllable current source modules 321, 322, ..., 32N are in the on state, which can provide a discharge path for the leakage current of the pre-drive leakage current modules 311, 312, ..., 31N. Thus, under the combined action of the high-side diagnostic circuit 120 and the low-side circuits 131, 132, ..., 13N, the voltage of the high-side connection load terminal HN2 can be lower than the battery voltage VBAT, thereby effectively avoiding false alarms of short power supply faults by the high-side diagnostic circuit 120. The enable signal is the second signal after the high-side diagnostic circuit 120 finishes its diagnosis (i.e., after the high-side circuit 110 is turned on). The controllable current source modules 321, 322, ..., 32N are in the off state, thereby cutting off the additional circuit consumption caused by the controllable current source modules 321, 322, ..., 32N being turned on when the drive circuit 100 is working normally, thus effectively reducing power consumption; and the logic is simple and easy to implement.

[0042] Preferably, in some exemplary embodiments, please refer to Figure 3 , Figure 3 This is a specific example diagram of a pre-drive device 300 provided in one embodiment of the present invention used in a solenoid valve system. From... Figure 3 It can be seen that, Figure 3 Medium load consists of solenoid valves SNV1, SNV2, ..., SNV N The pre-drive leakage current module 311 includes a first current source I. 11 The pre-drive leakage current module 312 includes a first current source I. 12 ...The pre-drive leakage current module 31N includes a first current source I. 1N The first current source I 11 I 12 ... I 1N The first terminal is used to receive the drive voltage VCP, and the first current source I 11 I 12 ... I 1N The second terminal is coupled to the low-side connection load terminals LN1, LN2, ..., LN of the low-side circuits 131, 132, ..., 13N corresponding to the pre-drive leakage current modules 311, 312, ..., 31N. N .

[0043] It should be noted that, as those skilled in the art will understand, the aforementioned pre-drive leakage current modules 311, 312, ..., 31N employ the first current source I. 11 I 12 ... I1N The design described herein is merely an exemplary illustration of a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. In other embodiments, the pre-drive leakage current modules 311, 312, ..., 31N may also employ methods other than the first current source I. 11 I 12 ... I 1N Other design methods besides these are also possible. For example, the pre-drive leakage current modules 311, 312, ..., 31N can employ, but are not limited to, voltage regulators, linear voltage regulator circuits, and integrated voltage regulator circuits. These will not be listed individually here.

[0044] In particular, since the structures of the various controllable current source modules 321, 322, ..., 32N of the pre-drive device 300 provided by this utility model are basically similar, for ease of understanding and description, the controllable current source module 321 is used as an example to illustrate the controllable current source module of the pre-drive device 300 provided by this utility model. For detailed information on the other controllable current source modules 322, ..., 32N of the pre-drive device 300 provided by this utility model, please refer to the description of the controllable current source module 321 for an adaptive understanding. They will not be described in detail here.

[0045] Preferably, in some exemplary embodiments, please continue to refer to Figure 3 ,from Figure 3 It can be seen that the controllable current source module 321 includes an enable switch K1 and a second current source I. 21 The first terminal of the enable switch K1 is coupled to the low-side connection load terminal LN1 of the corresponding low-side circuit 131, and the second terminal of the enable switch K1 is coupled to the second current source I. 21 The first terminal, the second current source I 21 The second terminal is grounded, and the control terminal of the enable switch K1 is used to receive the enable signal. Correspondingly, the enable switch K1 is configured to be in the on state when the enable signal is the first signal, and in the off state when the enable signal is the second signal. Therefore, the controllable current source modules 321, 322, ..., 32N of the pre-drive device 300 provided by this utility model use enable switches K1, K2, ..., K... N Second current source I 21 I 22 ... I 2N The series connection design is logically simple and easy to implement.

[0046] Preferably, in some exemplary embodiments, the second current source I 21 I 22 ... I 2NThe minimum transmittable current is not less than the maximum value of the leakage current of the pre-drive leakage current modules 311, 312, ..., 31N. Therefore, the leakage current of the pre-drive leakage current modules 311, 312, ..., 31N can be completely discharged, laying a solid foundation for effectively avoiding false short-power supply faults reported by the high-side diagnostic circuit. It should be noted that the pre-drive device 300 provided by this utility model... 21 I 22 ... I 2N Without imposing too many restrictions, but as a preferred option, the second current source I 21 I 22 ... I 2N The current capability is positively correlated with the high-side output voltage of the high-side circuit 110 in the off state. At a lower high-side output voltage, the second current source I... 21 I 22 ... I 2N The minimum transmittable current should still be greater than the maximum value of the leakage current of the pre-drive leakage current modules 311, 312, ..., 31N.

[0047] Based on the same inventive concept, another embodiment of this utility model also provides a driving circuit 100. For example, please continue to refer to... Figure 2 and Figure 3 ,from Figure 2 or Figure 3 As can be seen, the driving circuit 100 provided in this embodiment includes a high-side circuit 110, a high-side diagnostic circuit 120, at least one low-side circuit 131, 132, ..., 13N, and a pre-drive device 300 as described in any of the above embodiments. The pre-drive leakage current modules 311, 312, ..., 31N and the controllable current source modules 321, 322, ..., 32N of the pre-drive device 300 correspond one-to-one with the low-side circuits 131, 132, ..., 13N.

[0048] Since the drive circuit 100 provided by this utility model and the pre-drive device 300 for high-side diagnosis of drive circuit provided by this utility model belong to the same utility model concept, the drive circuit 100 provided by this utility model has at least all the advantages of the pre-drive device 300 for high-side diagnosis of drive circuit provided by this utility model. For details on the beneficial effects of the drive circuit 100 provided by this utility model, please refer to the above description of the beneficial effects of the pre-drive device 300 for high-side diagnosis of drive circuit provided by this utility model. It will not be repeated here.

[0049] Please continue reading Figure 3 ,from Figure 3It can be seen that the drive circuit 100 further comprises a charge pump (Charge Pump) 140 for generating the drive voltage VCP, and the output end of the charge pump 140 is respectively coupled to the first end of the pre-drive leakage current module 311, 312, …, 31N. It should be noted that the design method of the drive circuit 100 provided by the utility model for generating the drive voltage VCP by using the charge pump 140 is only an exemplary description of the preferred embodiment, and is not a limitation of the utility model. In the specific implementation of the utility model, the drive voltage VCP can also be generated by using other design methods other than the charge pump 140. For example, a boost circuit can be used to generate the drive voltage VCP according to the power supply voltage VBAT.

[0050] It should be noted that the specific structure of the low-side circuit 131, 132, …, 13N of the drive circuit provided by the utility model is not limited too much, and the structure of the low-side circuit 131, 132, …, 13N can be the same or different. Preferably, the structures of the low-side circuit 131, 132, …, 13N are the same. In order to avoid redundancy, the low-voltage circuit of the drive circuit provided by the utility model will be exemplarily described below by taking the low-side circuit 131 as an example.

[0051] Exemplarily, please continue to refer to Figure 3 , the low-side circuit 131 comprises a first switch tube T 11 and a second switch tube T 12 , the first end of the first switch tube T 11 is coupled to a first power supply (not shown in the figure, Figure 2 and Figure 3 the battery voltage VBAT output by the first power supply is schematically shown), the second end of the first switch tube T 11 , the first end of the second switch tube T 12 is coupled to the low-side connection load end LN1 of the low-side circuit 131, the second end of the second switch tube T 12 is grounded, and the control end of the first switch tube T 11 and the control end of the second switch tube T 12 are coupled to the output end of the pre-drive unit 301 corresponding thereto. Thus, the drive circuit 100 provided by the utility model, the low-side circuit 131, 132, …, 13N adopts the design method of the first switch tube T 11 , T 21 , …, T N1 and the second switch tube T 12 , T 22 , …, T N2 , which is simple in logic and easy to implement. It should be noted that the utility model is not limited to the first switch tube T 11 , T21 N and the second switch tube T 12 22 N2 Without further limitation, preferably, the first switch tube T 11 21 N and the second switch tube T 12 22 N2 is preferably a PMOS tube or an NMOS tube, etc. For the advantages of using a PMOS tube or an NMOS as the first switch tube T 11 21 N1 and the second switch tube T 12 22 N2 tube, please refer to the relevant technology known to those skilled in the art, which will not be described herein.

[0052] Preferably, the high-side circuit 110 and the low-side circuits 131, 132, …, 13N share the first power supply. Further, the driving voltage is greater than the output voltage of the first power supply, thereby ensuring that the pre-driving units 301, 302, …, 30N can drive the first switch tube T 11 21 N1 and the second switch tube T 12 22 N2 .

[0053] Exemplarily, please continue to refer to Figure 2 and Figure 3 from Figure 2 and Figure 3 ​​​​​​​​​​​​​​​It can be seen that the high-side diagnostic circuit 120 comprises a pull-up power module 121 and a pull-down voltage division circuit 122, the pull-down voltage division circuit 122 comprises a first resistor R1 and a second resistor R2, a first end of the pull-up power module 121 is used for coupling a second power supply (not shown in the figure, taking a pull-up power voltage V0 shown by the second power supply as an example), a second end of the pull-up power module 121 and a first end of the first resistor R1 are coupled to the high-side connection load end HN2, a second end of the first resistor R1 and a first end of the second resistor R2 are commonly connected to a voltage sampling point (not marked in the figure), and a second end of the second resistor R2 is grounded. Thus, the driving circuit 100 provided by the utility model, the pull-down voltage division circuit 122 only comprises the first resistor R1 and the second resistor R2, not only can effectively reduce the power consumption of the high-side diagnostic circuit 120, significantly reduce the area of the PCB and the design cost, and the logic is simple and easy to implement.

[0054] Further, from Figure 3 It can be seen that the pull-up power module 121 comprises a third resistor R3 and a diode Z1, thus, the pull-up power module 121 adopts the design mode of the third resistor R3 and the diode Z1, when the short power supply and short ground fault detection of the high-side circuit 110 are carried out, the current can be effectively prevented from flowing back to the second power supply, thereby effectively ensuring the use safety of the second power supply.

[0055] Exemplarily, the voltage sampling point is configured to be coupled to an electronic control unit (not shown in the figure, Figure 3 MCU is taken as an example), for more detailed contents about how to carry out the short power supply and short ground fault detection of the high-side circuit 110, please refer to the related technology known by those skilled in the art, and here, the details are not expanded.

[0056] In order to facilitate understanding of the utility model, next, the working state of the driving circuit 100 provided by the utility model is exemplarily described as follows by taking Figure 3 as an example:

[0057] Before the high-side OFF diagnosis is carried out, the electronic control unit ECU sets the enable signal to the first signal, thereby turning on the enable switches K1, K2, …, K N So that the second current source I 21 , I 22 , …, I 2N is turned on, the pre-drive leakage current modules 311, 312, …, 31N (that is, the first current source I 11 , I 12 , …, I 1N) provides a leakage path; the second power supply provides a bias voltage for the high-side connected load end HN2 through the pull-up power module 121, the smaller the voltage of the high-side connected load end HN2, the greater the current output by the pull-up power module 121, and the smaller the capability of the controllable current source module 321, 322, …, 32N of the pre-driving device 300, when the output current of the second power supply is consistent with the current of the second current source I 21 , 22 , …, 2N , the smaller the capability of the controllable current source module 321, 322, …, 32N of the pre-driving device 300, when the output current of the second power supply is consistent with the current of the second current source I 21 , 22 , …, 2N , the voltage of the high-side connected load end HN2 is in a balanced state, the voltage of the high-side connected load end HN2 is lower than the battery voltage VBAT, and false short power supply failure is avoided. After the high-side circuit 110 is turned on, the electronic control unit ECU sets the enable signal to the second signal, thereby turning off the enable switches K1, K2, …, K N , so that the second current source I 21 , 22 , …, 2N is turned off, and the additional current consumption generated by the second current source I 21 , 22 , …, 2N during normal operation is cut off.

[0058] It should be noted that, due to the limitation of the length of the article, only the part associated with the driving circuit and the pre-driving device is described in this article, and other contents related to the driving circuit which are not mentioned in this article (such as how the pre-driving units 301, 302, …, 30N control the low-side circuits 131, 132, …, 13N, etc.) please refer to the related technology known to those skilled in the art, which will not be described here.

[0059] Based on the same utility model concept, another embodiment of the utility model provides an electromagnetic valve system, the electromagnetic valve system comprises at least one electromagnetic valve and the driving circuit of any one of the above embodiments, the voltage input end of at least one electromagnetic valve is coupled with the high-side connected load end of the driving circuit, and the ground end of the electromagnetic valve is coupled with one of the low-side connected load ends of the driving circuit.

[0060] It should be noted that, as can be understood by those skilled in the art, the utility model does not make too many limitations on the specific type of the electromagnetic valve. For example, the electromagnetic valve includes but is not limited to fuel electromagnetic valve, brake booster electromagnetic valve, exhaust system electromagnetic valve, automatic transmission system electromagnetic valve, air conditioning system electromagnetic valve, steering booster electromagnetic valve and suspension system electromagnetic valve, etc. For other more detailed contents of the electromagnetic valve, please refer to the related technology known to those skilled in the art, which will not be described here due to the limitation of the length of the article.

[0061] Based on the same inventive concept, another embodiment of the utility model provides a vehicle controller, the vehicle controller includes the drive circuit of any one embodiment or the electromagnetic valve system of the above embodiment.

[0062] It needs to be explained that the utility model does not make too much limitation to the vehicle controller, for example, the vehicle controller can also include electronic control unit (such as ECU), and the electronic control unit can set the enable signal to the first signal before the high-side diagnostic circuit diagnoses, and set the enable signal to the second signal after the high-side diagnostic circuit diagnoses. It needs to be further explained that, as can be understood by those skilled in the art, the utility model does not make too much limitation to the specific type of the vehicle controller. For example, the vehicle controller can be but is not limited to body controller, vehicle controller and brake controller etc. For other more detailed contents of the vehicle controller, please refer to the related technology known to those skilled in the art, and this paper does not expand the description here due to the limited space.

[0063] Compared with the prior art, the utility model provides a kind of for the drive circuit high-side diagnosis pre-drive device, drive circuit, electromagnetic valve system and vehicle controller, with the following advantages:

[0064] The utility model provides a kind of for the drive circuit high-side diagnosis pre-drive device, the drive circuit includes high-side circuit, high-side diagnostic circuit and at least one low-side circuit, and the drive circuit is used to drive at least one load;The high-side diagnostic circuit is coupled the high-side connection load end of the high-side circuit, and the high-side connection load end is used to couple the voltage input end of load, and the low-side connection load end of each low-side circuit is used to connect the ground end of the load corresponding thereto;The pre-drive device has the pre-drive unit corresponding to the low-side circuit one by one, and the pre-drive unit includes pre-drive leakage current module and controllable current source module, the first end of the pre-drive leakage current module is used to receive drive voltage, and the low-side connection load end of each low-side circuit is respectively coupled the second end of the pre-drive leakage current module corresponding thereto and the first end of the controllable current source module, and the second end of the controllable current source module is grounded, and the controllable current source module is used to provide discharge path for the leakage current of the pre-drive leakage current module. Therefore, by the controllable current source module, the leakage current of the pre-drive leakage current module can be provided with discharge path, under the joint action of high-side diagnostic circuit and low-side circuit, the voltage of high-side connection load end can be made lower than battery voltage, to effectively avoid high-side diagnostic circuit false alarm short power supply fault. Further, compared with the related technology that a small resistance is connected in parallel with the pull-down voltage dividing circuit of high-side diagnostic circuit, the utility model can also effectively reduce the power consumption of high-side diagnostic circuit, significantly reduce the area of PCB and design cost.

[0065] Further, the control end of the controllable current source module can receive an enable signal, and the enable signal is a first signal before the high-side diagnostic circuit diagnoses (that is, before the high-side circuit is turned on), the controllable current source module is in an on state, and can provide a discharge path for the leakage current of the pre-driving leakage current module, so that, under the joint action of the high-side diagnostic circuit and the low-side circuit, the voltage at the high-side connection load end is lower than the battery voltage, thereby effectively avoiding false short power supply failure of the high-side diagnostic circuit. Further, the enable signal is a second signal after the high-side diagnostic circuit diagnoses (that is, after the high-side circuit is turned on), and the controllable current source module is in an off state, thereby cutting off the additional circuit consumption due to the on state of the controllable current source module when the driving circuit is normally working, thereby effectively reducing power consumption. The logic is simple and easy to implement.

[0066] Since the driving circuit, the electromagnetic valve system and the vehicle controller provided by the utility model belong to the same utility model concept as the pre-driving device provided by the utility model, the driving circuit, the electromagnetic valve system and the vehicle controller provided by the utility model have at least all the advantages of the pre-driving device provided by the utility model, and the detailed content of the beneficial effects of the driving circuit, the electromagnetic valve system and the vehicle controller provided by the utility model is described above in the related description of the beneficial effects of the pre-driving device provided by the utility model, and will not be repeated here.

[0067] It should be noted that the apparatus and method disclosed in the embodiments herein can also be implemented in other manners. The apparatus embodiments described above are only illustrative, and for example, the flowcharts and block diagrams in the embodiments herein illustrate possible implementation architectures, functions and operation of the apparatus, method and computer program product according to the embodiments herein. In this regard, each block in the flowcharts and block diagrams can represent a module, a segment or a portion of code which comprises one or more executable instructions for implementing the specified logic function. It should also be noted that in some alternative implementations, the functions noted in the blocks can occur in a different order than that noted in the flowcharts. For example, two blocks noted in succession can in fact be executed substantially concurrently or in reverse order, depending on the functions involved. It should also be noted that each block in the flowcharts and / or block diagrams and combinations of blocks in the flowcharts and / or block diagrams can be implemented by dedicated hardware-based systems which perform the specified functions or actions, or can be implemented by a combination of dedicated hardware and computer instructions.

[0068] In addition, each functional module in each embodiment herein can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0069] The above description is only a description of the preferred embodiment of the pre-driving device for high-side diagnosis of the driving circuit, the driving circuit, the electromagnetic valve system and the vehicle controller provided by the utility model, and is not any limitation on the scope of the utility model. Any change or modification made by a person skilled in the art according to the above disclosure belongs to the protection scope of the utility model. Obviously, those skilled in the art can make various modifications and changes to the utility model without departing from the spirit and scope of the utility model. Thus, if these modifications and changes belong to the scope of the utility model and its equivalent technology, the utility model also intends to include these modifications and changes.

Claims

1. A pre-driving device for driving circuit high-side diagnosis, characterized in that, The drive circuit comprises a high-side circuit, a high-side diagnostic circuit and at least one low-side circuit, and is configured to drive at least one load; the high-side diagnostic circuit is coupled to a high-side load connection end of the high-side circuit, and the high-side load connection end is configured to be coupled to a voltage input end of the load; a low-side load connection end of each of the low-side circuits is configured to be coupled to a ground end of the load corresponding thereto; the pre-driving device comprises a pre-driving unit corresponding to each of the low-side circuits, and the pre-driving unit comprises a pre-driving leakage current module and a controllable current source module; a first end of the pre-driving leakage current module is configured to receive a driving voltage; the low-side load connection end of each of the low-side circuits is respectively coupled to a second end of the pre-driving leakage current module corresponding thereto and a first end of the controllable current source module; and a second end of the controllable current source module is grounded.

2. The pre-driver device of claim 1, wherein, The control end of the controllable current source is configured to receive an enable signal, and the enable signal is a first signal before the high-side diagnostic circuit is diagnosed and is a second signal after the high-side diagnostic circuit is diagnosed; and the controllable current source module is configured to provide a discharge path for a leakage current of the pre-driving leakage current module. The controllable current source module is configured to be in a conducting state when the enable signal is the first signal and is in an off state when the enable signal is the second signal.

3. The pre-driver device of claim 1, wherein, The pre-driving leakage current module comprises a first current source, a first end of the first current source is configured to receive a driving voltage, and a second end of the first current source is coupled to the low-side load connection end of the low-side circuit corresponding to the pre-driving leakage current module.

4. The pre-driver device of claim 2, wherein, The controllable current source module comprises an enable switch and a second current source, a first end of the enable switch is coupled to the low-side load connection end of the low-side circuit corresponding thereto, a second end of the enable switch is coupled to a first end of the second current source, a second end of the second current source is grounded, and a control end of the enable switch is configured to receive the enable signal. The enable switch is configured to be in a conducting state when the enable signal is the first signal and is in an off state when the enable signal is the second signal.

5. The pre-driver device of claim 4, wherein, A minimum current that can be transmitted by the second current source is not less than a maximum value of the leakage current of the pre-driving leakage current module.

6. A drive circuit, characterized by The drive circuit comprises a high-side circuit, a high-side diagnostic circuit, at least one low-side circuit and the pre-driving device according to any one of claims 1 to 5, and the pre-driving unit of the pre-driving device corresponds to each of the low-side circuits.

7. The drive circuit according to claim 6, characterized in that, The low-side circuit comprises a first switch tube and a second switch tube, a first end of the first switch tube is coupled to a first power supply, a second end of the first switch tube and a first end of the second switch tube are coupled to a low-side load connection end of the low-side circuit, a second end of the second switch tube is grounded, and a control end of the first switch tube and a control end of the second switch tube are respectively coupled to an output end of the pre-driving unit corresponding thereto.

8. The drive circuit according to claim 7, characterized in that, The driving voltage is greater than an output voltage of the first power supply.

9. An electromagnetic valve system characterized by comprising: The drive circuit as claimed in any one of claims 6 to 8, wherein at least one solenoid valve is coupled to the high-side load terminal of the drive circuit and the ground terminal of the solenoid valve is coupled to one of the low-side load terminals of the drive circuit.

10. A vehicle controller characterized by comprising: The solenoid valve system as claimed in claim 9, wherein the drive circuit is as claimed in any one of claims 6 to 8.

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