Driving and diagnosis circuit and vehicle

Abstract

The utility model discloses a driving and diagnosis circuit and a vehicle, and relates to the technical field of circuits, the driving and diagnosis circuit comprises a diagnosis voltage module, a high-side diagnosis voltage acquisition module, a low-side diagnosis voltage acquisition module, a high-side diagnosis current acquisition module and a low-side diagnosis current acquisition module; the diagnosis voltage module is connected with the high-side diagnosis voltage acquisition module, the high-side diagnosis current acquisition module and one end of the load; and the low-side diagnosis voltage acquisition module is connected with the low-side diagnosis current acquisition module and the other end of the load. The high-side diagnosis voltage acquisition module is used for acquiring diagnosis voltage to judge whether short circuit exists in the circuit or not, so that the error diagnosis rate during starting is reduced; in the starting process and the driving process, diagnosis current is collected through the high-side diagnosis current collection module and the low-side diagnosis current collection module, the diagnosis accuracy in the driving process is improved, and misdiagnosis is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of circuits, in particular to a driving and diagnostic circuit and a vehicle. Background Art

[0002] When a power driver currently matches a capacitive load, a transient large current will be generated during startup, resulting in a problem of false overcurrent fault reporting. The existing methods mainly avoid the capacitive load driving problem by simply increasing the filtering time or increasing the current detection threshold. However, the scheme of increasing the filtering time will cause damage to the controller MOS transistor when a short-circuit fault occurs, while increasing the current detection threshold will introduce the risk of overcurrent damage caused by a load fault.

[0003] In summary, there is a need to provide a driving and diagnostic circuit with a low false diagnosis rate applicable to capacitive loads. Summary of the Utility Model

[0004] To solve the above problems, the utility model proposes a driving and diagnostic circuit and a vehicle.

[0005] In a first aspect, the present application proposes a driving and diagnostic circuit, including: a disconnection voltage module, a high-side diagnostic voltage acquisition module, a low-side diagnostic voltage acquisition module, a high-side diagnostic current acquisition module, and a low-side diagnostic current acquisition module;

[0006] The diagnostic voltage module is connected to the high-side diagnostic voltage acquisition module, the high-side diagnostic current acquisition module, and one end of the load;

[0007] The low-side diagnostic voltage acquisition module is connected to the low-side diagnostic current acquisition module and the other end of the load.

[0008] Further, for the driving and diagnostic circuit as described above, the diagnostic voltage module includes: a first triode, a second triode, a first resistor, a second resistor, a third resistor, a fourth resistor, and a fifth resistor;

[0009] The emitter of the first triode is connected to one end of the first resistor, the base is connected to one end of the second resistor and one end of the third resistor, and the collector is connected to one end of the load;

[0010] The collector of the second triode is connected to the other end of the third resistor, the base is connected to one end of the fourth resistor and one end of the fifth resistor, and the emitter and the other end of the fifth resistor are both connected to the ground terminal;

[0011] The other ends of the first resistor, the second resistor, and the fourth resistor are all input with a first power supply voltage.

[0012] Further, in the driving and diagnostic circuit as described above, the high-side diagnostic voltage acquisition module includes: a sixth resistor and a seventh resistor;

[0013] One end of the sixth resistor is connected to the diagnostic voltage module, and the other end is connected to one end of the seventh resistor;

[0014] The other end of the seventh resistor is connected to the ground terminal.

[0015] Further, in the driving and diagnostic circuit as described above, the high-side diagnostic current acquisition module includes: an eighth resistor and a first MOS transistor;

[0016] One end of the eighth resistor inputs a second power supply voltage, and the other end is connected to the drain of the first MOS transistor;

[0017] The source of the first MOS transistor is connected to the diagnostic voltage module.

[0018] Further, in the driving and diagnostic circuit as described above, the low-side diagnostic voltage acquisition module includes: a ninth resistor and a tenth resistor;

[0019] One end of the ninth resistor is connected to the other end of the load, and the other end is connected to one end of the tenth resistor;

[0020] The other end of the tenth resistor is connected to the ground terminal.

[0021] Further, in the driving and diagnostic circuit as described above, the low-side diagnostic current acquisition module includes: an eleventh resistor and a second MOS transistor;

[0022] The drain of the second MOS transistor is connected to the other end of the load, and the source is connected to one end of the eleventh resistor;

[0023] The other end of the eleventh resistor is connected to the ground terminal.

[0024] Further, in the driving and diagnostic circuit as described above, the load includes a capacitive load.

[0025] Further, in the driving and diagnostic circuit as described above, it is characterized in that the first MOS transistor and the second MOS transistor include NMOS transistors.

[0026] Further, in the driving and diagnostic circuit as described above, the first triode includes a PNP type triode; the second triode includes an NPN type triode.

[0027] In a second aspect, the present application proposes a vehicle, including the driving and diagnostic circuit according to any one of the first aspect.

[0028] The advantages of the present utility model are as follows: The diagnostic voltage module provides a diagnostic voltage before the capacitive load starts. By using a high-side diagnostic voltage acquisition module and / or a low-side diagnostic voltage acquisition module to collect the diagnostic voltage, it is determined whether there is a short circuit in the circuit. If not, the large current generated when the capacitive load starts can be excluded through the filtering time, reducing the misdiagnosis rate during startup. During startup and the driving process, the high-side diagnostic current acquisition module and the low-side diagnostic current acquisition module are also used to collect the diagnostic current. If the diagnostic current collected during startup is too large and the duration exceeds the preset threshold time, or the diagnostic current collected during the driving process is too large, it indicates that there is a short circuit fault in the driving circuit, improving the diagnostic accuracy and avoiding misdiagnosis. Description of the Drawings

[0029] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present utility model. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0030] Figure 1 is a schematic diagram of a driving and diagnostic circuit provided by the present utility model;

[0031] Figure 2 is a schematic diagram of a diagnostic voltage module of a driving and diagnostic circuit provided by the present utility model;

[0032] Figure 3 is a schematic diagram of a high-side diagnostic voltage acquisition module of a driving and diagnostic circuit provided by the present utility model;

[0033] Figure 4 is a schematic diagram of a high-side diagnostic current acquisition module of a driving and diagnostic circuit provided by the present utility model;

[0034] Figure 5 is a schematic diagram of a low-side diagnostic voltage acquisition module of a driving and diagnostic circuit provided by the present utility model;

[0035] Figure 6 is a schematic diagram of a low-side diagnostic current acquisition module of a driving and diagnostic circuit provided by the present utility model;

[0036] Figure 7 is a schematic diagram of a load of a driving and diagnostic circuit provided by the present utility model;

[0037] Figure 8 is a schematic diagram of another driving and diagnostic circuit provided by the present utility model;

[0038] Figure 9It is a schematic diagram of the current flow path of the protection diagnosis voltage module of a drive and diagnosis circuit provided by the present utility model;

[0039] Figure 10 It is a schematic diagram of the current drive path of a load of a drive and diagnosis circuit provided by the present utility model. Specific embodiments

[0040] The following further describes the exemplary embodiments of the present utility model with reference to the accompanying drawings. Although the exemplary embodiments of the present utility model are shown in the drawings, it should be understood that the present utility model can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present utility model and to fully convey the scope of the present utility model to those skilled in the art.

[0041] The embodiments of the present utility model will be described in detail below with reference to the accompanying drawings.

[0042] In a first aspect, as Figure 1 shown, according to an embodiment of the present application, a drive and diagnosis circuit is proposed, including: a diagnosis voltage module 100, a high-side diagnosis voltage acquisition module 200, a low-side diagnosis voltage acquisition module 300, a high-side diagnosis current acquisition module 400, and a low-side diagnosis current acquisition module 500;

[0043] The diagnosis voltage module 100 is connected to one end of the high-side diagnosis voltage acquisition module 200, the high-side diagnosis current acquisition module 400, and the load 600;

[0044] The low-side diagnosis voltage acquisition module 300 is connected to the low-side diagnosis current acquisition module 500 and the other end of the load 600.

[0045] As Figure 2 shown, the diagnosis voltage module 100 of the embodiment of the present application includes: a first triode Q1, a second triode Q2, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, and a fifth resistor R5. The emitter e of the first triode Q1 is connected to one end of the first resistor R1, the base b is connected to one end of the second resistor R2 and one end of the third resistor R3, and the collector c is connected to one end of the load 600. The collector c of the second triode Q2 is connected to the other end of the third resistor R3, the base b is connected to one end of the fourth resistor R4 and one end of the fifth resistor R5, and the emitter e and the other end of the fifth resistor R5 are both connected to the ground terminal GND. The other ends of the first resistor R1, the second resistor R2, and the fourth resistor R4 are all input with a first power supply voltage V1.

[0046] Wherein, the first power supply voltage V1 is 5V and is used for circuit diagnosis.

[0047] As Figure 3 shown, the high-side diagnostic voltage acquisition module 200 of the embodiment of the present application includes: a sixth resistor R6 and a seventh resistor R7. One end of the sixth resistor R6 is connected to the diagnostic voltage module 100, and the other end is connected to one end of the seventh resistor R7. The other end of the seventh resistor R7 is connected to the ground terminal GND.

[0048] Among them, the connection point VH of the sixth resistor R6 and the seventh resistor R7 is the high-side diagnostic voltage acquisition point, which is used to obtain the high-side diagnostic voltage.

[0049] As Figure 4 shown, the high-side diagnostic current acquisition module 400 of the embodiment of the present application includes: an eighth resistor R8 and a first MOS transistor M1. One end of the eighth resistor R8 inputs a second power supply voltage V2, and the other end is connected to the drain of the first MOS transistor M1. The source of the first MOS transistor M1 is connected to the diagnostic voltage module 100.

[0050] Among them, the second power supply voltage V2 is 24V, which is used to drive the load module 600. The source of the first MOS transistor M1 is also connected to one end of the sixth resistor R6 of the high-side diagnostic voltage acquisition module 200 and the collector c of the first triode Q1 of the diagnostic voltage module 100. One end of the ninth resistor R9 of the low-side diagnostic voltage acquisition module 300 is connected, and the gate G1 is used to input a driving signal. The connection point (endpoint) A1 where the eighth resistor R8 inputs the second power supply voltage V2 is the first diagnostic current acquisition point, and the connection point A2 where the eighth resistor R8 is connected to the drain of the first MOS transistor M1 is the second diagnostic current acquisition point. Both the first diagnostic current acquisition point and the second diagnostic current acquisition point are used to acquire the high-side diagnostic current.

[0051] As Figure 5 shown, the low-side diagnostic voltage acquisition module 300 of the embodiment of the present application includes: a ninth resistor R9 and a tenth resistor R10. One end of the ninth resistor R9 is connected to the other end of the load 600, and the other end is connected to one end of the tenth resistor R10. The other end of the tenth resistor R10 is connected to the ground terminal GND.

[0052] Among them, the connection point V2 of the ninth resistor R9 and the tenth resistor R10 is the low-side diagnostic voltage acquisition point, which is used to obtain the low-side diagnostic voltage.

[0053] As Figure 6 shown, the low-side diagnostic current acquisition module 500 of the embodiment of the present application includes: an eleventh resistor R11 and a second MOS transistor M2. The drain of the second MOS transistor M2 is connected to the other end of the load 600, and the source is connected to one end of the eleventh resistor R11. The other end of the eleventh resistor R11 is connected to the ground terminal GND.

[0054] Among them, the drain of the second MOS transistor M2 is also connected to one end of the ninth resistor R9 of the low-side diagnostic voltage acquisition module 300, and the gate G2 is used to input a driving signal. The connection point A3 where the eleventh resistor R11 is connected to the drain of the second MOS transistor M2 is the third diagnostic current acquisition point, and the connection point (endpoint) A4 where the eleventh resistor R11 is connected to the ground terminal GND is the fourth diagnostic current acquisition point. Both the third diagnostic current acquisition point and the fourth diagnostic current acquisition point are used to acquire the low-side diagnostic current.

[0055] The load of the embodiment of the present application includes a capacitive load. As Figure 7 shown, the capacitor C represents the capacitor in the capacitive load, and the resistor R represents the resistor in the capacitive load.

[0056] In the embodiment of the present application, the first MOS transistor M1 and the second MOS transistor M2 include NMOS transistors.

[0057] In the embodiment of the present application, the first triode Q1 includes a PNP-type triode; the second triode Q2 includes an NPN-type triode.

[0058] In the embodiment of the present application, the ground terminal GND includes: grounding, protective grounding, and equipotential grounding, etc., and the potential is not necessarily the ground potential.

[0059] Next, as Figure 8 shown, the present application will be further described.

[0060] Taking the first resistor R1 as 30 Ω, the second resistor R2 as 12 kΩ, the third resistor R3 as 38 kΩ, the fourth resistor R4 as 5 kΩ, the fifth resistor R5 as 47 kΩ, the sixth resistor R6 as 50 kΩ, the seventh resistor R7 as 50 kΩ, the eighth resistor R8 as 10 mΩ, the ninth resistor R9 as 50 kΩ, the tenth resistor R10 as 50 kΩ, the eleventh resistor R11 as 10 mΩ, the resistor R in the capacitive load as 10 Ω, and the load capacitor C in the capacitive load as 400 μF, the present application will be described.

[0061] As Figure 8 shown, input the first power supply voltage V1 to the diagnostic voltage module 100 with current limiting and short-circuit protection, and assist in high-side-to-ground short-circuit diagnosis by quickly providing a stable diagnostic voltage before driving the load 600.

[0062] When a capacitive load needs to be driven, first turn on the first power supply voltage V1 of 5V and the second power supply voltage V2 of 24V. At this time, the fourth resistor R4 and the fifth resistor R5 divide the voltage of the base b of the second triode Q2, generating a voltage of 0.7V on the base b of the second triode Q2, and the second triode Q2 turns on. At this time, the second resistor R2 and the third resistor R3 divide the voltage of the base b of the first triode Q1, generating a voltage of 4.3V on the base b of the first triode Q1, and the first triode Q1 turns on. The 5V first power supply voltage V1 flows through the first triode Q1 to the high-side drive (point H), generating a diagnostic voltage of about 5V on the high-side drive line. At this time, the high-side diagnostic voltage acquisition module 200 acquires a voltage of 2.5V from the VH point as the high-side diagnostic voltage. If the high side is shorted to ground at this time, the acquired voltage (high-side diagnostic voltage) is 0V. If the high side is shorted to the power supply, the acquired voltage is 12V.

[0063] When the high side is shorted to ground, the current flowing through the first resistor R1 and the first triode Q1 increases. When the current continuously increases until it is greater than 20mA, the voltage across the first resistor R1 at this time is 30×20 = 600mV. Then the voltage difference between the base and the emitter (BE) of the first triode Q1 drops to the turn-on threshold of the first triode Q1, reducing the opening degree of the first triode Q1, thereby maintaining the overcurrent at 20mA and protecting the diagnostic voltage module 100 and the 5V pull-up source.

[0064] At this time, the current flow path of the protection diagnostic voltage module 100 is as Figure 9 shown, which are respectively from the pull-up source (the first power supply voltage V1) to the fourth resistor R4 to the second triode Q2 to the ground terminal GND, from the pull-up source to the second resistor R2 to the third resistor R3 to the second triode Q2, from the pull-up source to the first resistor R1 to the base of the first triode Q1, and from the pull-up source to the first resistor R1 to the first triode Q1 to the high-side drive (point H).

[0065] The low-side diagnostic voltage acquisition module 300 is used to acquire the low-side diagnostic voltage from the V2 point.

[0066] Embodiments of the present application also use a high-side diagnostic current acquisition module 400 and a low-side diagnostic current acquisition module 500 to diagnose current. Through a high-side current sampling resistor (the eighth resistor R8) and a low-side current sampling resistor (the eleventh resistor R11), the current flowing through the high-side diagnostic current acquisition module 400 and the low-side diagnostic current acquisition module 500 is converted into a voltage signal. Since both the eighth resistor R8 and the eleventh resistor R11 are 10 mΩ, a current of 1 A is equivalent to a voltage of 10 mV. The overcurrent diagnostic threshold is set to 10 A. At this current, the first MOS transistor M1 and the second MOS transistor M2 can operate normally. A continuous current exceeding this current can cause the first MOS transistor M1 and the second MOS transistor M2 to be damaged due to overheating.

[0067] When starting to drive the capacitive load in the load 600, voltage diagnosis is first performed. If the diagnostic voltages (high-side diagnostic voltage and low-side diagnostic voltage) obtained through the high-side diagnostic voltage acquisition module 200 and the low-side diagnostic voltage acquisition module 300 can determine that the circuit is fault-free, then the first MOS transistor M1 of the high-side diagnostic current acquisition module 400 and the second MOS transistor M2 of the low-side diagnostic current acquisition module 500 can be turned on, so that the high-side drive and the low-side drive (point L) are turned on.

[0068] The current drive path of the load 600 is as Figure 10 shown. The 24V second power supply voltage V2 passes through the eighth resistor R8 to the first MOS transistor M1. When the first MOS transistor M1 and the second MOS transistor M2 are turned on, the 24V second power supply voltage V2 drives the load 600, and then passes through the second MOS transistor M2 to reach the eleventh resistor R11.

[0069] At this time, due to the characteristics of the capacitive load, an instantaneous large current of about 30 A will be generated on the high-side drive line. At this time, by reading the overcurrent fault through the control module and combining the voltage diagnosis before driving, the wrong fault information can be filtered out by increasing the filtering time by 100 μs, and the driving can continue. The control module is respectively connected to the high-side diagnostic voltage acquisition point VH, the low-side diagnostic voltage acquisition point VL, the first diagnostic current acquisition point A1, the second diagnostic current acquisition point A2, the third diagnostic current acquisition point A3, and the fourth diagnostic current acquisition point A4 to obtain the high-side diagnostic voltage, the low-side diagnostic voltage, the high-side diagnostic current, and the low-side diagnostic current. The control module can also be connected to the gate G1 of the first MOS transistor M1 and the gate G2 of the second MOS transistor M2 to respectively control the conduction or disconnection of the first MOS transistor M1 and the second MOS transistor M2. The control module includes a single-chip microcomputer, etc.

[0070] If a short - circuit fault occurs during the subsequent driving process, the short - circuit current will be greater than 10A at this time, causing the voltage between the first diagnostic current acquisition point A1 and the second diagnostic current acquisition point A2 to be greater than 10mV, or causing the voltage between the third diagnostic current acquisition point A3 and the fourth diagnostic current acquisition point A4 to exceed 10mV, thereby triggering short - circuit protection, disconnecting the first MOS transistor M1 and the second MOS transistor M2, and thus turning off the drive.

[0071] In a second aspect, according to an embodiment of the present application, a vehicle is provided, including the driving and diagnostic circuit according to any one of the first aspects.

[0072] The benefits of this embodiment are as follows: using common components such as resistors, MOS transistors, and triodes, the cost is relatively low; and the components are easy to replace and obtain; through the 5V pull - up source with current limiting and short - circuit protection in the high - side diagnostic voltage acquisition module, a stable diagnostic voltage is quickly provided before driving to assist in high - side to - ground short - circuit diagnosis, reducing the large current and its corresponding voltage when starting to drive a capacitive load and the interference to diagnosis, and improving the success rate of diagnosis. During the driving process, the current of the driving circuit can also be diagnosed in real time through the high - side diagnostic current acquisition module and the low - side diagnostic current acquisition module, improving the safety and reliability of the driving circuit.

[0073] What is described above in this specification is only an example of the present utility model. Those skilled in the technical field to which the present utility model belongs can make various modifications or supplements to the described specific embodiments or use similar methods for substitution, as long as they do not deviate from the content of this specification of the present utility model or exceed the scope defined by this claims, they should fall within the protection scope of the present utility model.

Claims

1. A drive and diagnostic circuit, characterized in that, Comprising: A diagnostic voltage module, a high-side diagnostic voltage acquisition module, a low-side diagnostic voltage acquisition module, a high-side diagnostic current acquisition module, and a low-side diagnostic current acquisition module; The diagnostic voltage module is connected to the high-side diagnostic voltage acquisition module, the high-side diagnostic current acquisition module, and one end of the load; The low-side diagnostic voltage acquisition module is connected to the low-side diagnostic current acquisition module and the other end of the load.

2. The drive and diagnostic circuit according to claim 1, characterized in that, The diagnostic voltage module includes: a first triode, a second triode, a first resistor, a second resistor, a third resistor, a fourth resistor, and a fifth resistor; The emitter of the first triode is connected to one end of the first resistor, the base is connected to one end of the second resistor and one end of the third resistor, and the collector is connected to one end of the load; The collector of the second triode is connected to the other end of the third resistor, the base is connected to one end of the fourth resistor and one end of the fifth resistor, and the emitter and the other end of the fifth resistor are both connected to the ground terminal; The other end of the first resistor, the other end of the second resistor, and the other end of the fourth resistor all input a first power supply voltage.

3. The drive and diagnostic circuit according to claim 1, characterized in that, The high-side diagnostic voltage acquisition module includes: a sixth resistor and a seventh resistor; One end of the sixth resistor is connected to the diagnostic voltage module, and the other end is connected to one end of the seventh resistor; The other end of the seventh resistor is connected to the ground terminal.

4. A drive and diagnostic circuit according to claim 1, characterized in that, The high-side diagnostic current acquisition module includes: an eighth resistor and a first MOS transistor; One end of the eighth resistor inputs a second power supply voltage, and the other end is connected to the drain of the first MOS transistor; The source of the first MOS transistor is connected to the diagnostic voltage module.

5. A driving and diagnostic circuit as claimed in claim 1, characterized in that, The low-side diagnostic voltage acquisition module includes: a ninth resistor and a tenth resistor; One end of the ninth resistor is connected to the other end of the load, and the other end is connected to one end of the tenth resistor; The other end of the tenth resistor is connected to the ground terminal.

6. The drive and diagnostic circuit according to claim 4, characterized in that, The low-side diagnostic current acquisition module includes: an eleventh resistor and a second MOS transistor; The drain of the second MOS transistor is connected to the other end of the load, and the source is connected to one end of the eleventh resistor; The other end of the eleventh resistor is connected to the ground terminal.

7. The drive and diagnostic circuit according to claim 1, characterized in that, The load includes a capacitive load.

8. A drive and diagnostic circuit according to claim 6, wherein The first MOS transistor and the second MOS transistor include NMOS transistors.

9. The drive and diagnostic circuit according to claim 2, wherein The first triode includes a PNP-type triode; the second triode includes an NPN-type triode.

10. A vehicle, characterized in that, Including the drive and diagnostic circuit according to any one of claims 1 to 9.

Images