Solenoid valve driving chip and electronic device

Abstract

The application provides an electromagnetic valve driving chip and electronic equipment, which comprises H first driving modules, K second driving modules and a control module; the application sets H first driving units to respectively perform high-side driving or low-side driving on H electromagnetic valves, sets K second driving units to respectively perform low-side driving on K electromagnetic valves, and sets H+K to be greater than or equal to 14, so that the integration requirement of driving the electromagnetic valves is met on the basis of meeting the multifunctional driving of the electromagnetic valves. Meanwhile, a first safety diagnosis unit and a second safety diagnosis unit are respectively set for each first driving unit and each second driving unit to realize overcurrent detection, voltage clamping and open / short circuit detection of the first driving unit and realize overcurrent detection, voltage clamping and open / short circuit detection of the second driving unit, so that the safety performance of the electromagnetic valve driving chip is greatly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electronic circuit design, and in particular to an electromagnetic valve driving chip and an electronic device. BACKGROUND

[0002] With the continuous development of intelligent driving, the intelligent chassis technology has become an important support for the development of automobile intelligence. The core of the intelligent chassis technology is to replace the traditional mechanical signal with an electrical signal to achieve precise control of the vehicle. This technology can significantly improve the safety, driving experience, and control ability of advanced functions such as automatic driving of the vehicle.

[0003] In order to achieve systematic control of the vehicle, the intelligent chassis technology usually needs to control multiple electromagnetic valves, and each electromagnetic valve corresponds to a driving path. However, the electromagnetic valve driving chip of the prior art has the problems of low integration and low safety factor, which cannot meet the requirements of the intelligent chassis technology for the systematic control of the vehicle.

[0004] Therefore, it has become a technical problem in the industry to provide an electromagnetic valve driving chip with high integration and high safety factor. SUMMARY

[0005] The technical problem solved by the present application is to provide an electromagnetic valve driving chip and an electronic device, which solves the problem of low integration and low safety factor of the electromagnetic valve driving chip of the prior art.

[0006] To solve the above technical problems, the technical scheme of the present application provides an electromagnetic valve driving chip for driving a plurality of electromagnetic valves, the electromagnetic valve driving chip comprising:

[0007] H first driving modules, each of the first driving modules comprising a first driving unit and a first safety diagnosis unit; each of the first driving units is connected to a corresponding electromagnetic valve, and each of the first driving units is configured to perform high-side driving or low-side driving on the corresponding electromagnetic valve according to a first driving signal; each of the first safety diagnosis units is configured to detect whether the corresponding first driving unit is overcurrent, and output a first overcurrent detection signal and a second overcurrent detection signal, clamp the output voltage of the corresponding first driving unit, and output a voltage clamping signal; and detect whether the corresponding electromagnetic valve has a breakage or a short circuit, and output a breakage or short circuit diagnosis signal;

[0008] K second driving modules, each of the second driving modules comprising a second driving unit and a second safety diagnosis unit, each of the second driving units being connected to a corresponding electromagnetic valve, each of the second driving units being configured to low-side drive the corresponding electromagnetic valve according to a second driving signal; each of the second safety diagnosis units being configured to detect whether the corresponding second driving unit is overcurrent, output a second overcurrent detection signal, clamp an output voltage of the corresponding second driving unit, and output a voltage clamping signal; and detect whether the corresponding electromagnetic valve is open or short-circuited, and output an open or short-circuit diagnosis signal;

[0009] a control module configured to:

[0010] output a corresponding first driving signal to the corresponding first driving unit and a corresponding second driving signal to the corresponding second driving unit according to an input driving control signal;

[0011] output an overcurrent warning signal of the corresponding first driving unit and an overcurrent warning signal of the corresponding second driving unit according to the input first overcurrent detection signal and the input second overcurrent detection signal;

[0012] turn off the corresponding first driving unit and the corresponding second driving unit according to the input voltage clamping signal; and

[0013] diagnose a type of open or short-circuit of the corresponding electromagnetic valve according to the open or short-circuit diagnosis signal, and output an open or short-circuit type signal.

[0014] wherein the H first driving modules, the K second driving modules, and the control module are integrated in the same chip.

[0015] wherein K and H are positive integers, and K+H≥14.

[0016] Optionally, the first driving unit comprises a first driving subunit, a second driving subunit, a first power transistor, and a second power transistor, an input end of the first driving subunit and an input end of the second driving subunit are connected to the control module, an output end of the first driving subunit is connected to a gate of the first power transistor, and an output end of the second driving subunit is connected to a gate of the second power transistor; a drain of the first power transistor is connected to a power supply voltage, a source of the first power transistor is connected to a drain of the second power transistor; a drain of the second power transistor is further connected to the corresponding electromagnetic valve, and a source of the second power transistor is connected to a ground terminal.

[0017] Optionally, the first safety diagnosis unit comprises an open or short-circuit detection subunit, a first overcurrent detection subunit, a second overcurrent detection subunit, and a voltage clamping subunit.

[0018] The open / short circuit detection subunit is configured to compare the drain voltage of the first power tube, a first reference voltage and a second reference voltage to diagnose an open / short circuit of the drain of the second power tube when the corresponding power tube is turned off, and output a corresponding open / short circuit diagnosis signal, wherein the first reference voltage is greater than the second reference voltage.

[0019] The first overcurrent detection subunit is configured to compare the source voltage and the drain voltage of the first power tube to detect overcurrent of the first power tube, and output a corresponding first overcurrent detection signal according to the detection result.

[0020] The second overcurrent detection subunit is configured to compare the drain voltage of the second power tube and a third reference voltage to detect overcurrent of the second power tube, and output a corresponding second overcurrent detection signal according to the detection result.

[0021] The voltage clamping subunit is configured to clamp the drain voltage of the second power tube, and output a corresponding voltage clamping signal.

[0022] Optionally, the first overcurrent detection subunit comprises a first comparator and a reference voltage source, wherein the non-inverting input terminal of the first comparator is connected to the drain of the first power tube, the inverting input terminal of the comparator is connected to the positive electrode of the reference voltage source, and the negative electrode of the reference voltage source is connected to the source of the first power tube.

[0023] Optionally, the second drive unit comprises a second drive subunit and a second power tube, wherein the input terminal of the second drive subunit is connected to the control module, the output terminal of the second drive subunit is connected to the gate of the second power tube, the drain of the second power tube is connected to the corresponding electromagnetic valve, and the source of the second power tube is connected to the ground terminal.

[0024] Optionally, the second safety diagnosis unit comprises an open / short circuit detection subunit, a second overcurrent detection subunit and a voltage clamping subunit.

[0025] The open / short circuit detection subunit is configured to compare the drain voltage of the second power tube, a first reference voltage and a second reference voltage to diagnose an open / short circuit of the drain of the second power tube, and output a corresponding open / short circuit diagnosis signal, wherein the first reference voltage is greater than the second reference voltage.

[0026] The second overcurrent detection subunit is configured to compare the drain voltage of the second power tube and a third reference voltage to detect overcurrent of the second power tube, and output a corresponding second overcurrent detection signal according to the detection result.

[0027] The voltage clamping subunit is configured to clamp a drain voltage of the second power tube and output a corresponding voltage clamping signal.

[0028] Optionally, the open-short detection subunit comprises a first operational amplifier, a second comparator and a third comparator.

[0029] The output end of the first operational amplifier is connected to the drain of the second power tube and to the inverting input end of the first operational amplifier, the non-inverting input end of the first operational amplifier is connected to a first voltage, and the first voltage is used to represent the drain voltage of the second power tube when the solenoid valve is open.

[0030] The inverting input end of the second comparator and the inverting input end of the third comparator are both connected to the inverting input end of the first operational amplifier, the non-inverting input end of the second comparator is connected to the first reference voltage, and the non-inverting input end of the third comparator is connected to the second reference voltage, and the output end of the second comparator and the output end of the third comparator both serve as the output end of the open-short detection subunit.

[0031] The first reference voltage is greater than the first voltage, and the first voltage is greater than the second reference voltage.

[0032] Optionally, the open-short detection subunit further comprises a first switch, a second switch, a first current source, a second current source, a first resistor, a second resistor, a fourth comparator and a fifth comparator.

[0033] The first end of the first switch is connected to a power supply voltage, and the second end of the first switch is connected to the first end of the first resistor.

[0034] The first resistor, the first current source, the second switch, the second current source and the second resistor are connected in series, the anode of the second current source is further connected to the drain of the second power tube, and the second end of the second resistor is connected to a ground end.

[0035] The non-inverting input end of the fourth comparator is connected to the second end of the first resistor, and the inverting input end of the fourth comparator is connected to the first reference voltage; the inverting input end of the fifth comparator is connected to the first end of the second resistor, and the non-inverting input end of the fifth comparator is connected to the second reference voltage; and the output end of the fourth comparator and the output end of the fifth comparator both serve as the output end of the open-short detection subunit.

[0036] The first switch and the second switch are both turned off when the corresponding solenoid valve is turned on, the first switch is turned on when the corresponding solenoid valve is turned off and is driven by a high side, and the second switch is turned on when the corresponding solenoid valve is turned off and is driven by a low side.

[0037] Optionally, the second over-current detection subunit comprises a third resistor, a third power tube, a fourth resistor and a sixth comparator.

[0038] The first end of the third resistor is connected to the drain of the second power tube, and the second end of the third resistor is connected to the drain of the third power tube.

[0039] The gate of the third power tube is connected to the gate of the second power tube and the output end of the second driving subunit, and the source of the third power tube is connected to the first end of the fourth resistor.

[0040] The non-inverting input end of the sixth comparator is connected to the source of the third power tube, the inverting input end of the sixth comparator is connected to the third reference voltage, and the output end of the sixth comparator serves as the output end of the second over-current detection subunit.

[0041] The second end of the fourth resistor is connected to a ground end.

[0042] The size of the third power tube is proportional to the size of the second power tube.

[0043] Optionally, the first over-current detection subunit and the second over-current detection subunit each further comprise a fourth power tube, a third current source and a seventh comparator.

[0044] The negative pole of the third current source is connected to a power supply voltage, and the positive pole of the third current source is connected to the inverting input end of the seventh comparator.

[0045] The non-inverting input end of the seventh comparator is connected to the drain of the second power tube, and the output end of the seventh comparator serves as the output end of the second over-current detection subunit.

[0046] The drain of the fourth power tube is connected to the positive pole of the third current source, the gate of the fourth power tube is connected to the gate of the second power tube, the source of the fourth power tube is connected to a ground end, and the size ratio of the fourth power tube to the second power tube is 1 / L; L is a positive integer and greater than 1.

[0047] Optionally, the voltage clamping subunit comprises a Zener diode, a fifth resistor, a sixth resistor and a buffer.

[0048] The negative pole of the Zener diode is connected to the drain of the second power tube, and the positive pole of the Zener diode is connected to the first end of the fifth resistor.

[0049] The second end of the fifth resistor is connected to the first end of the sixth resistor, and the second end of the sixth resistor is connected to the gate of the second power tube.

[0050] The input end of the buffer is connected with the second end of the fifth resistor, and the output end of the buffer is used as the output end of the voltage clamping subunit.

[0051] The technical scheme of the present application also provides an electronic device comprising the electromagnetic valve driving chip provided by the technical scheme of the present application.

[0052] Compared with the prior art, the technical scheme of the embodiment of the present application has the following beneficial effects:

[0053] In the electromagnetic valve driving chip of the technical scheme of the present application, H first driving units are arranged to respectively perform high-side driving or low-side driving on H electromagnetic valves, K second driving units are arranged to respectively perform low-side driving on K electromagnetic valves, and H+K is greater than or equal to 14, so that the requirement of the integration degree of driving the electromagnetic valves is met on the basis of meeting the multifunctional driving of the electromagnetic valves. Meanwhile, a first safety diagnosis unit and a second safety diagnosis unit are respectively arranged for each first driving unit and each second driving unit to realize overcurrent detection, voltage clamping and open / short circuit detection of the first driving unit and overcurrent detection, voltage clamping and open / short circuit detection of the second driving unit, so that the safety performance of the electromagnetic valve driving chip is greatly improved. Since the electromagnetic valve driving chip of the present application meets the requirement of the integration degree of driving the electromagnetic valves and also meets high safety performance, the performance of the intelligent chassis control technology for the systematized control of the vehicle is greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0054] Figure 1 The circuit module schematic diagram of the electromagnetic valve driving chip provided by the technical scheme of the present application is shown in the figure.

[0055] Figures 2 to 5 The circuit structure schematic diagram of the electromagnetic valve driving chip provided by the technical scheme of the present application is shown in the figure. Figures 1 to 4 . DETAILED DESCRIPTION

[0056] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the scope of protection of the present application. The terms "first", "second", "third", "fourth" and the like (if any) in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not have to be limited to the clearly listed steps or units, but can include other steps or units that are not clearly listed or inherent to the process, method, product or device.

[0057] An electromagnetic valve is a device for controlling the flow of a medium (such as a liquid, a gas, etc.) by using electromagnetic principles. Its working principle mainly includes two aspects of electromagnetic force driving and medium control. When the electromagnetic coil is energized, the magnetic field generated will cause the displacement of the piston or the valve core, thereby changing the flow state of the medium. By controlling the size and direction of the electromagnetic force, the on-off control, adjustment control or shunt control of the medium flow can be realized.

[0058] However, the electromagnetic valve driving chip in the prior art usually only has 8 driving channels or 12 driving channels, so it cannot meet the integration requirements of the electromagnetic valve driving. At the same time, the electromagnetic valve driving chip in the prior art only has the short-circuit detection function of the driving channel, so it cannot meet the application scenarios with higher safety performance.

[0059] Therefore, the technical solutions of the present application provide a new electromagnetic valve driving chip for driving a plurality of electromagnetic valves.

[0060] Among them, Figure 1 The circuit module schematic diagram of the electromagnetic valve driving chip provided by the technical solutions of the present application.

[0061] Please refer to Figure 1 The electromagnetic valve driving chip provided by the technical solutions of the present application comprises:

[0062] H first driving modules 100, each of the first driving modules 100 comprises a first driving unit 102 and a first safety diagnosis unit 101; each of the first driving units 102 is connected to a corresponding electromagnetic valve, each of the first driving units 102 is used for high-side driving or low-side driving of the corresponding electromagnetic valve according to a first driving signal; each of the first safety diagnosis units 101 is used for detecting whether the corresponding first driving unit 102 overflows, and outputs a first overcurrent detection signal and a second overcurrent detection signal; clamps an output voltage of the corresponding first driving unit 102, and outputs a voltage clamping signal; and detects whether the corresponding electromagnetic valve has a breakage or a short circuit, and outputs a breakage or short circuit diagnosis signal;

[0063] The first driving unit 102 can drive the electromagnetic valve in high side or low side, and the specific driving mode is controlled by the first driving signal. The first overcurrent detection signal corresponds to the overcurrent detection when the first driving unit 102 drives the electromagnetic valve in high side, and the second overcurrent detection signal corresponds to the overcurrent detection when the first driving unit 102 drives the electromagnetic valve in low side.

[0064] K second driving modules 200, each of the second driving modules 200 comprises a second driving unit 202 and a second safety diagnosis unit 201, each of the second driving units 202 is connected to a corresponding electromagnetic valve, each of the second driving units 202 is used for low-side driving of the corresponding electromagnetic valve according to a second driving signal; each of the second safety diagnosis units 201 is used for detecting whether the corresponding second driving unit 202 overflows, and outputs a second overcurrent detection signal; clamps an output voltage of the corresponding second driving unit 202, and outputs a voltage clamping signal; and detects whether the corresponding electromagnetic valve has a breakage or a short circuit, and outputs a breakage or short circuit diagnosis signal;

[0065] The first safety diagnosis unit 101 and the second safety diagnosis unit 201 detect whether the corresponding electromagnetic valve has a breakage or a short circuit, specifically, whether the corresponding electromagnetic valve has a breakage or a short circuit.

[0066] The first driving module 100 is used for realizing driving control of the electromagnetic valve in different application scenarios, and the second driving module 200 is used for realizing driving control of the electromagnetic valve in a single application scenario.

[0067] A control module 300, the control module 300 is used for:

[0068] According to the input driving control signal Va, output the corresponding first driving signal to the corresponding first driving unit 102, and output the corresponding second driving signal to the corresponding second driving unit 202;

[0069] According to the input first overcurrent detection signal and the second overcurrent detection signal, output the overcurrent warning signal Vb corresponding to the first drive unit 102 and the overcurrent warning signal Vb corresponding to the second drive unit 202;

[0070] According to the input voltage clamping signal, turn off the corresponding first drive unit 102 and the corresponding second drive unit 202 respectively; and

[0071] According to the short-circuit diagnosis signal, diagnose the short-circuit type of the corresponding electromagnetic valve, and output the short-circuit type signal Vc;

[0072] Wherein, H first drive modules 100, K second drive modules 200 and the control module 300 are integrated in the same chip;

[0073] Wherein, K and H are positive integers, and K+H≥14.

[0074] Through the above technical means, the technical scheme can not only meet the integration requirement of driving the electromagnetic valve, but also realize high safety performance of driving the electromagnetic valve, thereby greatly improving the performance of the intelligent chassis control technology on the vehicle system control. The specific principle is as follows:

[0075] The electromagnetic valve driving chip of the application is provided with H first drive modules 100, each of which is provided with a first drive unit 102 corresponding to an electromagnetic valve, so as to realize high-side drive or low-side drive of the corresponding electromagnetic valve in different application scenarios. The electromagnetic valve driving chip of the application is also provided with K second drive modules 200, each of which is provided with a second drive unit 202 corresponding to an electromagnetic valve, so as to realize low-side drive of the corresponding electromagnetic valve in a single application scenario. Since K and H are positive integers, and K+H≥14, the integration of driving the electromagnetic valve is greatly improved on the basis of meeting the multifunctional drive of the electromagnetic valve, so as to meet the integration requirement of driving the electromagnetic valve.

[0076] Meanwhile, each first drive module 100 and each second drive module 200 are respectively provided with a first safety diagnosis unit 101 and a second safety diagnosis unit 201. The first safety diagnosis unit 101 can not only detect whether the corresponding first drive unit 102 is overcurrent, but also clamp the output voltage of the corresponding first drive unit 102, and detect whether the corresponding electromagnetic valve has a short-circuit. Similarly, the second safety diagnosis unit 201 can also detect whether the corresponding second drive unit 202 is overcurrent, clamp the output voltage of the corresponding second drive unit 202, and detect whether the corresponding electromagnetic valve has a short-circuit, thereby greatly improving the safety performance of each drive unit when driving the corresponding electromagnetic valve.

[0077] Based on the above technical means, the technical scheme of the present application can not only meet the integration requirement of driving the electromagnetic valve, but also realize high safety performance of the electromagnetic valve driving, thereby greatly improving the performance of the intelligent chassis control technology on the vehicle system control

[0078] In order to make the above-mentioned purposes, features and benefits of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0079] Among them, Figures 2 to 5 Respectively, the circuit structure of the electromagnetic valve driving chip provided by the technical scheme of the present application Figures 1 to 4 .

[0080] Please refer to Figure 2 As a specific embodiment, the first driving unit 102 includes: a first driving sub-unit 1021, a second driving sub-unit 1022, a first power tube M1 and a second power tube M2, the input end of the first driving sub-unit 1021 and the input end of the second driving sub-unit 1022 are connected to the control module 300, the output end of the first driving sub-unit 1021 is connected to the gate of the first power tube M1, and the output end of the second driving sub-unit 1022 is connected to the gate of the second power tube M2; the drain of the first power tube M1 is connected to the power supply voltage, and the source of the first power tube M1 is connected to the drain of the second power tube M2; the drain of the second power tube M2 is also connected to the corresponding electromagnetic valve, and the source of the second power tube M2 is connected to the ground.

[0081] Among them, the first driving unit 102 can not only drive the corresponding electromagnetic valve through the first driving sub-unit 1021 and the first power tube M1, but also drive the corresponding electromagnetic valve through the second driving sub-unit 1022 and the second power tube M2, thereby meeting the driving requirements of the corresponding electromagnetic valve in different application scenarios. The specific driving mode of the corresponding electromagnetic valve is controlled by the first driving signal output by the control module 300.

[0082] Please refer to Figure 2 The first safety diagnosis unit 101 includes: a short-circuit detection sub-unit 1011, a first overcurrent detection sub-unit 1012, a second overcurrent detection sub-unit 1013 and a voltage clamping sub-unit 1014.

[0083] The first power tube M1 and the second power tube M2 both have the possibility of overcurrent when the first power tube M1 drives the corresponding electromagnetic valve on the high side and the second power tube M2 drives the corresponding electromagnetic valve on the low side. Therefore, the first overcurrent detection subunit 1012 is arranged to compare the drain-source voltage of the first power tube M1 with an overcurrent reference voltage, to detect the overcurrent of the first power tube M1, and output a corresponding first overcurrent detection signal according to the detection result; and the second overcurrent detection subunit 1013 is arranged to compare the drain voltage of the second power tube M2 with a third reference voltage VREF3, to detect the overcurrent of the second power tube M2, and output a corresponding second overcurrent detection signal according to the detection result. When the control module 300 receives the first overcurrent detection signal or the second overcurrent detection signal, the control module 300 outputs an off signal to the first drive module in which the overcurrent power tube exists, so as to make the corresponding drive unit in the first drive module turn off the overcurrent power tube.

[0084] Although the control module 300 turns off the first power tube M1 or the second power tube M2 when overcurrent exists, the first power tube M1 or the second power tube M2 may actually be unable to be turned off due to the short circuit of the drain of the second power tube M2. Therefore, after the first power tube M1 or the second power tube M2 is turned off due to overcurrent, the short circuit detection subunit 1011 compares the drain voltage of the second power tube M2 with the first reference voltage VREF1 and the second reference voltage VREF2, and sends a corresponding first short circuit detection signal to the control module 300 according to the comparison result. The control module 300 diagnoses the short circuit of the drain of the second power tube M2 according to the high side drive or the low side drive of the electromagnetic valve and according to the first short circuit detection signal.

[0085] In addition to the short circuit detection of the drain of the second power tube M2 and the overcurrent detection of the first power tube M1 and the second power tube M2, when the electromagnetic valve is driven from on to off, the drain voltage of the second power tube M2 is often boosted due to the energy carried by the inductance in the electromagnetic valve. Therefore, the voltage clamping subunit 1014 is arranged to clamp the drain voltage of the second power tube M2 and output a corresponding voltage clamping signal. The control module 300 is further configured to turn on the corresponding second power tube M2 according to the input voltage clamping signal, so as to discharge the charge of the drain of the second power tube M2 to the ground, thereby reducing the drain voltage of the second power tube M2.

[0086] The following takes the embodiment shown in FIG. 1 as an example to describe the subunits in the first safety diagnosis unit 101 in detail. Figure 3

[0087] Please refer to​Figure 3 In Figure 3 In the embodiment shown, the open / short circuit detection subunit 1011 specifically includes a first operational amplifier op1, a second comparator ap2, and a third comparator ap3.

[0088] The output end of the first operational amplifier op1 is connected to the drain of the second power tube M2 and to the inverting input end of itself, the non-inverting input end of the first operational amplifier op1 is connected to a first voltage, and the first voltage is used to represent the drain voltage of the second power tube M2 when the electromagnetic valve is open.

[0089] The inverting input end of the second comparator ap2 and the inverting input end of the third comparator ap3 are both connected to the inverting input end of the first operational amplifier op1, the non-inverting input end of the second comparator ap2 is connected to the first reference voltage VREF1, and the non-inverting input end of the third comparator ap3 is connected to the second reference voltage VREF2. The output end of the second comparator ap2 and the output end of the third comparator ap3 both serve as the output end of the open / short circuit detection subunit 1011.

[0090] Among them, the first reference voltage VREF1 is greater than the first voltage, and the first voltage is greater than the second reference voltage VREF2.

[0091] In this embodiment, the working principle of the open / short circuit detection subunit 1011 is as follows:

[0092] When the first driving unit 102 performs high-side driving on the electromagnetic valve, the electromagnetic valve is connected between the first power tube M1 and the ground. When the open / short circuit detection is performed on the first power tube M1, the first power tube M1 is turned off.

[0093] If no open / short circuit occurs at the drain of the second power tube M2, the drain voltage of the second power tube M2 will be close to the power supply voltage and will be greater than the first reference voltage VREF1 and the second reference voltage VREF2. Since the inverting input end of the second comparator ap2 and the inverting input end of the third comparator ap3 are both connected to the drain of the second power tube M2, the second comparator ap2 and the third comparator ap3 both output low level.

[0094] If the drain of the second power transistor M2 is open, the inverting input of the second comparator ap2 and the inverting input of the third comparator ap3 are both connected to the first voltage due to the virtual short of the first operational amplifier op 1. Since the first reference voltage VREF1 is greater than the first voltage, and the first voltage is greater than the second reference voltage VREF2, the second comparator ap2 outputs a high level, and the third comparator ap3 outputs a low level.

[0095] If the drain of the second power transistor M2 is shorted to the power supply, the inverting input of the second comparator ap2 and the inverting input of the third comparator ap3 are both connected to the power supply voltage, so the second comparator ap2 and the third comparator ap3 both output a low level.

[0096] When the first driving unit 102 performs low-side driving on the electromagnetic valve, the electromagnetic valve is connected between the power supply voltage and the drain of the second power transistor M2. When the second power transistor M2 is detected for open / short circuit, the second power transistor M2 is turned off.

[0097] When the second power transistor M2 is detected for open / short circuit, the second power transistor M2 is turned off. If no open / short circuit occurs at the drain of the second power transistor M2, the inverting input of the second comparator ap2 and the inverting input of the third comparator ap3 are both connected to the power supply voltage, so the second comparator ap2 and the third comparator ap3 both output a low level.

[0098] If the drain of the second power transistor M2 is open, the inverting input of the second comparator ap2 and the inverting input of the third comparator ap3 are both connected to the first voltage due to the virtual short of the first operational amplifier op 1. Since the first reference voltage VREF1 is greater than the first voltage, and the first voltage is greater than the second reference voltage VREF2, the second comparator ap2 outputs a high level, and the third comparator ap3 outputs a low level.

[0099] If the drain of the second power transistor M2 is shorted to ground, the drain voltage of the second power transistor M2 approaches ground and is less than the first reference voltage VREF1 and the second reference voltage VREF2. Since the inverting input of the second comparator ap2 and the inverting input of the third comparator ap3 are both connected to the drain of the second power transistor M2, the second comparator ap2 and the third comparator ap3 both output a high level.

[0100] Therefore, no matter whether the electromagnetic valve is high-side driven or low-side driven, the logic control module 130 can determine that the drain of the second power tube M2 is open according to the high level output by the second comparator ap2 and the low level output by the third comparator ap3.

[0101] If the electromagnetic valve is high-side driven, the logic control module 130 can determine that the drain of the second power tube M2 is neither open nor short according to the high level output by the second comparator ap2 and the third comparator ap3. The logic control module 130 can also determine that the drain of the second power tube M2 is shorted to the power supply according to the high level output by the second comparator ap2 and the low level output by the third comparator ap3.

[0102] If the electromagnetic valve is low-side driven, the logic control module 130 can determine that the drain of the second power tube M2 is neither open nor short according to the low level output by the second comparator ap2 and the third comparator ap3. The logic control module 130 can also determine that the drain of the second power tube M2 is shorted to the ground according to the high level output by the second comparator ap2 and the high level output by the third comparator ap3.

[0103] Of course, the connection objects of the non-inverting input and the inverting input of the second comparator ap2 and the third comparator ap3 can also be interchanged, and the open / short determination of the electromagnetic valve also needs to be changed accordingly, which will not be described here.

[0104] The open / short detection subunit 1011 in the first safety diagnosis unit 101 further has Figure 3 other embodiments, please refer to Figure 4 .

[0105] Please refer to Figure 4 , in Figure 4 the embodiment shown, the open / short detection subunit 1011 includes a first switch SW1, a second switch SW2, a first current source Isource1, a second current source Isource2, a first resistor R1, a second resistor R2, a fourth comparator ap4 and a fifth comparator ap5.

[0106] The first end of the first switch SW1 is connected to the power supply voltage, and the second end of the first switch SW1 is connected to the first end of the first resistor R1.

[0107] The first resistor R1, the first current source Isource1, the second switch SW2, the second current source Isource2 and the second resistor R2 are connected in series, the anode of the second current source Isource2 is also connected to the drain of the second power tube M2, and the second end of the second resistor R2 is connected to the ground.

[0108] The non-inverting input terminal of the fourth comparator ap4 is connected to the second end of the first resistor R1, and the inverting input terminal of the fourth comparator ap4 is connected to the first reference voltage VREF 1; the inverting input terminal of the fifth comparator ap5 is connected to the first end of the second resistor R2, and the non-inverting input terminal of the fifth comparator ap5 is connected to the second reference voltage VREF2; the output terminal of the fourth comparator ap4 and the output terminal of the fifth comparator ap5 are both output terminals of the open-short circuit detection sub-unit 1011.

[0109] Wherein, the first switch SW1 and the second switch SW2 are both turned off when the corresponding electromagnetic valve is turned on, and the first switch SW1 and the second switch SW2 are both turned on when the corresponding electromagnetic valve is turned off.

[0110] In this embodiment, the working principle of the open-short circuit detection sub-unit 1011 is as follows:

[0111] When the first drive unit 11 performs high-side driving on the electromagnetic valve, the electromagnetic valve is connected between the first power tube M1 and the ground terminal.

[0112] When the electromagnetic valve is normally turned on, the first switch SW1 and the second switch SW2 are both turned off to avoid affecting the first power tube M1 and the second power tube M2 during driving the electromagnetic valve.

[0113] When the open-short circuit detection is performed on the first power tube M1, the first power tube M1 and the second power tube M2 are both turned off.

[0114] In the first stage, the first switch SW1 is turned on and the second switch SW2 is kept off. At this time, if no open circuit or short circuit occurs at the source of the first power tube M1, the negative electrode of the first current source Isource1 will be pulled down to the ground terminal due to the source of the first power tube M1, and the fourth comparator ap4 outputs low level. If the source of the first power tube M1 is short-circuited to the power supply, the negative electrode of the first current source Isource1 will be connected to the power supply voltage VBAT due to the source of the first power tube M1, and the fourth comparator ap4 outputs low level.

[0115] In the second stage, the second switch SW2 is turned on and the first switch SW1 is turned off. At this time, if no open circuit or short circuit occurs in the source of the first power transistor Ml, the positive terminal of the second current source Isource2 is pulled to the ground, and the fifth comparator ap5 outputs a high level. If the source of the first power transistor Ml is short-circuited to the power supply, the positive terminal of the second current source Isource2 is connected to the power supply voltage VBAT through the source of the first power transistor Ml, and the fourth comparator ap4 outputs a low level.

[0116] Finally, according to the low level output by the fourth comparator ap4 in the first stage and the high level output by the fifth comparator ap5 in the second stage, it is determined that no open circuit or short circuit occurs in the source of the first power transistor Ml. According to the low level output by the fourth comparator ap4 in the first stage and the low level output by the fifth comparator ap5 in the second stage, it is determined that the source of the first power transistor Ml is short-circuited to the power supply.

[0117] When the first driving unit 11 performs low-side driving on the electromagnetic valve, the electromagnetic valve is connected between the power supply voltage VBAT and the second power transistor M2.

[0118] When the electromagnetic valve is normally turned on, the first switch SW1 and the second switch SW2 are both turned off to avoid affecting the first power transistor Ml and the second power transistor M2 during driving of the electromagnetic valve.

[0119] When detecting the short circuit of the second power transistor M2, the first power transistor Ml and the second power transistor M2 are both turned off.

[0120] In the first stage, the first switch SW1 is turned on and the second switch SW2 is kept off. At this time, if no open circuit or short circuit occurs in the drain of the second power transistor M2, the negative terminal of the first current source Isource1 is connected to the power supply voltage VBAT through the drain of the second power transistor M2, and the fourth comparator ap4 outputs a low level. If the drain of the second power transistor M2 is short-circuited to the ground, the negative terminal of the first current source Isource1 is connected to the ground through the drain of the second power transistor M2, and the fourth comparator ap4 outputs a low level.

[0121] In the second stage, the second switch SW2 is turned on and the first switch SW1 is turned off. At this time, if the drain of the second power transistor M2 is not open or shorted, the positive terminal of the second current source Isource2 is pulled to the voltage VBAT, and the fifth comparator ap5 outputs a low level. If the drain of the second power transistor M2 is shorted to the ground, the positive terminal of the second current source Isource2 is grounded through the drain of the second power transistor M2, and the fourth comparator ap4 outputs a high level.

[0122] Finally, according to the low level output by the fourth comparator ap4 in the first stage and the low level output by the fifth comparator ap5 in the second stage, it is determined that the drain of the second power transistor M2 is not open or shorted. According to the low level output by the fourth comparator ap4 in the first stage and the high level output by the fifth comparator ap5 in the second stage, it is determined that the drain of the second power transistor M2 is shorted to the ground.

[0123] Of course, the connection objects of the non-inverting input and the inverting input of the fourth comparator ap4 and the fifth comparator ap5 can be interchanged, and the open circuit determination of the electromagnetic valve also needs to be changed accordingly, which will not be described here.

[0124] Please refer to Figure 3 , in Figure 3 the embodiment, the first overcurrent detection subunit 1012 specifically includes a first comparator ap1 and a reference voltage source Vsource. The non-inverting input of the first comparator ap1 is connected to the drain of the first power transistor M1, the inverting input of the comparator is connected to the positive terminal of the reference voltage source Vsource, and the negative terminal of the reference voltage source Vsource is connected to the source of the first power transistor M1.

[0125] In this embodiment, the working principle of the first overcurrent detection subunit 1012 is as follows:

[0126] The non-inverting input of the first comparator ap1 is connected to the drain of the first power transistor M1, and the inverting input of the first comparator ap1 is connected to the source of the first power transistor M1 through the reference voltage source Vsource. Therefore, when the first power transistor M1 is normally turned on, the voltage at the inverting input of the first comparator ap1 is higher than that at the non-inverting input, i.e., the first comparator ap1 outputs a low level, indicating that the first power transistor M1 is not overcurrent. However, when the voltage at the source of the first power transistor M1 decreases to make the voltage at the non-inverting input of the first comparator ap1 higher than that at the inverting input, the first comparator ap1 outputs a high level, indicating that the first power transistor M1 is overcurrent.

[0127] Of course, the connection of the non-inverting input and the inverting input of the first comparator ap1 can also be interchanged, and the overcurrent determination of the first power tube M1 also needs to be changed, which will not be repeated here.

[0128] Please refer to Figure 3 , in Figure 3 In the embodiment shown, the second overcurrent detection subunit 1013 specifically includes a third resistor R3, a third power tube M3, a fourth resistor R4, and a sixth comparator ap6.

[0129] The first end of the third resistor R3 is connected to the drain of the second power tube M2, and the second end of the third resistor R3 is connected to the drain of the third power tube M3.

[0130] The gate of the third power tube M3 is connected to the gate of the second power tube M2 and the output of the second drive subunit 1022, and the source of the third power tube M3 is connected to the first end of the fourth resistor R4.

[0131] The non-inverting input of the sixth comparator ap6 is connected to the source of the third power tube M3, the inverting input of the sixth comparator ap6 is connected to the third reference voltage VREF3, and the output of the sixth comparator ap6 is used as the output of the second overcurrent detection subunit 1013.

[0132] The second end of the fourth resistor R4 is connected to the ground.

[0133] Among them, the size of the third power tube M3 is proportional to the size of the second power tube M2.

[0134] It should be noted that the third reference voltage VREF3 is used to represent the voltage at the first end of the fourth resistor R4 when the current flowing through the second power tube M2 reaches the overcurrent threshold. Of course, the overcurrent threshold can be adaptively set according to different application scenarios, which is not limited here.

[0135] In this embodiment, the working principle of the second overcurrent detection subunit 1013 is as follows:

[0136] When the second power tube M2 is turned on, the third power tube M3 is also turned on. Since the size of the third power tube M3 is proportional to the size of the second power tube M2, the current flowing through the third power tube M3 is also proportional to the current flowing through the second power tube M2, which is equivalent to the current flowing through the second power tube M2 is scaled down by the same proportion to the path where the third power tube M3 is located.

[0137] Because the inverting input terminal of the sixth comparator ap6 is connected to the third reference voltage VREF3 and the non-inverting input terminal of the sixth comparator ap6 is connected to the drain of the third power transistor M3, when the sixth comparator ap6 outputs a low level, it indicates to the control module 300 that the current flowing through the second power transistor M2 is not overcurrent. When the sixth comparator ap6 outputs a high level, it indicates to the control module 300 that the current flowing through the second power transistor M2 is overcurrent.

[0138] It should be noted that, in order to avoid affecting the current flowing through the second power transistor M2 when the second power transistor M2 is turned on, the size of the third power transistor M3 needs to be designed to be very small, so that the current flowing through the third power transistor M3 is very small.

[0139] Of course, the connection objects of the non-inverting input terminal and the inverting input terminal of the sixth comparator ap6 can also be interchanged, and the overcurrent determination of the seventh power transistor also needs to be adaptively changed, which will not be described here.

[0140] It should be noted that, in addition to Figure 3 the embodiments shown, there are other embodiments, please refer to Figure 5 .

[0141] Please refer to Figure 5 , in Figure 5 the embodiments shown, the first overcurrent detection subunit 1012 and the second overcurrent detection subunit 1013 each include a fourth power transistor M4, a third current source Isource3 and a seventh comparator ap7;

[0142] The negative electrode of the third current source Isource3 is connected to the power supply voltage, and the positive electrode of the third current source Isource3 is connected to the inverting input terminal of the seventh comparator ap7;

[0143] The non-inverting input terminal of the seventh comparator ap7 is connected to the drain of the second power transistor M2, and the output terminal of the seventh comparator ap7 serves as the output terminal of the second overcurrent detection subunit 1013;

[0144] The drain of the fourth power tube M4 is connected to the anode of the third current source Isource3, the gate of the fourth power tube M4 is connected to the gate of the second power tube M2, the source of the fourth power tube M4 is connected to the ground, and the size ratio of the fourth power tube M4 and the second power tube M2 is 1 / L, where L is a positive integer, and the larger L is, the more accurate the detection of the current flowing through the fourth power tube M4 is, thereby making the overcurrent detection of the second power tube M2 more accurate.

[0145] Since the working principles of the first overcurrent detection subunit 1012 and the second overcurrent detection subunit 1013 are the same, only the working principle of the second overcurrent detection subunit 1013 will be described below. In this embodiment, the working principle of the second overcurrent detection subunit 1013 is as follows:

[0146] The third current source Isource3 and the fourth power tube M4 generate a reference voltage at the drain of the fourth power tube M4. The reference voltage is used to represent the drain voltage of the second power tube M2 when the second power tube M2 is overcurrent.

[0147] Since the non-inverting input terminal of the seventh comparator ap7 is connected to the drain of the second power tube M2 and the inverting input terminal of the seventh comparator ap7 is connected to the anode of the third current source Isource3, the overcurrent of the second power tube M2 can be detected by comparing the drain voltage of the second power tube M2 with the reference voltage.

[0148] Please refer to Figure 3 , in Figure 3 the embodiment, the voltage clamping subunit 1014 specifically includes: a Zener diode D1, a fifth resistor R5, a sixth resistor R6, and a buffer.

[0149] The negative electrode of the Zener diode D1 is connected to the drain of the second power tube M2, and the positive electrode of the Zener diode D1 is connected to the first end of the fifth resistor R5.

[0150] The second end of the fifth resistor R5 is connected to the first end of the sixth resistor R6, and the second end of the sixth resistor R6 is connected to the gate of the second power tube M2.

[0151] The input end of the buffer is connected to the second end of the fifth resistor R5, and the output end of the buffer serves as the output end of the voltage clamping subunit 1014.

[0152] In this embodiment, the working principle of the voltage clamping subunit 1014 is as follows:

[0153] When the drain voltage of the second power tube M2 is greater than the breakdown voltage of the Zener diode D1, i.e. the drain voltage of the second power tube M2 is overvoltage, the Zener diode D1 is broken down, and the drain voltage of the second power tube M2 will be raised by the gate of the second power tube M2 being gathered to raise the gate voltage of the second power tube M2. The rise of the gate voltage of the second power tube M2 will further turn on the second power tube M2, thereby ensuring that the drain voltage of the second power tube M2 will not continue to rise, thereby achieving clamping of the drain voltage of the second power tube M2. At the same time, the drain voltage of the second power tube M2 will also be fed back to the control module 300 through the voltage division circuit composed of the fifth resistor R5, the sixth resistor R6 and the buffer, so as to judge the drain overvoltage of the second power tube M2 through the control module 300.

[0154] Please refer to Figure 2 , as a specific embodiment, the second drive unit includes: a second drive sub-unit 2022 and a second power tube M2, the input end of the second drive sub-unit 2022 is connected to the control module 300, the output end of the second drive sub-unit 2022 is connected to the gate of the second power tube M2, the drain of the second power tube M2 is connected to the corresponding electromagnetic valve, and the source of the second power tube M2 is connected to the ground.

[0155] Among them, the second drive unit is only used for low-side driving the corresponding electromagnetic valve.

[0156] The second safety diagnosis unit includes: a short-circuit detection sub-unit 2011, a second overcurrent detection sub-unit 2013 and a voltage clamping sub-unit 2014.

[0157] In function, the short-circuit detection sub-unit 2011, the second overcurrent detection sub-unit 2013 and the voltage clamping sub-unit 2014 in the second safety diagnosis unit all have the same effect as the short-circuit detection sub-unit 2011, the second overcurrent detection sub-unit 2013 and the voltage clamping sub-unit 2014 in the first safety diagnosis unit, which will not be repeated here.

[0158] In a specific embodiment, the short-circuit detection sub-unit 2011, the second overcurrent detection sub-unit 2013 and the voltage clamping sub-unit 2014 in the second safety diagnosis unit also all have the same circuit structure and working principle as the short-circuit detection sub-unit 2011, the second overcurrent detection sub-unit 2013 and the voltage clamping sub-unit 2014 in the first safety diagnosis unit in the embodiment shown, which will not be repeated here. Figure 3 The short-circuit detection sub-unit 2011, the second overcurrent detection sub-unit 2013 and the voltage clamping sub-unit 2014 in the first safety diagnosis unit in the embodiment shown have the same circuit structure and working principle as the short-circuit detection sub-unit 2011, the second overcurrent detection sub-unit 2013 and the voltage clamping sub-unit 2014 in the first safety diagnosis unit in the embodiment shown, which will not be repeated here.

[0159] It should be noted that, since the second driving unit only performs low-side driving on the electromagnetic valve, the working principle of the open / short circuit detection subunit 2011 in the second safety diagnosis unit does not include open / short circuit detection when performing high-side driving on the electromagnetic valve.

[0160] The specific implementation of the open / short circuit detection subunit 2011 of the second safety diagnosis unit can also include Figure 4 The second switch SW2, the second current source Isource2, the fifth comparator ap5, and the second resistor R2 in the illustrated embodiment are the same as the first switch SW1, the first current source Isource1, the first comparator ap1, and the first resistor R1 in the illustrated embodiment, and thus will not be described again here. Figure 4 The second switch SW2, the second current source Isource2, the fifth comparator ap5, and the second resistor R2 in the illustrated embodiment are the same as the first switch SW1, the first current source Isource1, the first comparator ap1, and the first resistor R1 in the illustrated embodiment, and thus will not be described again here.

[0161] The specific implementation of the second overcurrent detection subunit 2013 of the second safety diagnosis unit can also be the same as the second overcurrent detection subunit 2013 of the first safety diagnosis unit in the illustrated embodiment, and thus will not be described again here. Figure 5 The specific implementation of the second overcurrent detection subunit 2013 of the second safety diagnosis unit can also be the same as the second overcurrent detection subunit 2013 of the first safety diagnosis unit in the illustrated embodiment, and thus will not be described again here.

[0162] In summary, the electromagnetic valve driving chip provided by the embodiment of the present application is provided with H first driving modules, each of which is provided with a first driving unit corresponding to an electromagnetic valve, to realize high-side driving or low-side driving of the corresponding electromagnetic valve in different application scenarios. The electromagnetic valve driving chip of the present application is also provided with K second driving modules, each of which is provided with a second driving unit corresponding to an electromagnetic valve, to realize low-side driving of the corresponding electromagnetic valve in a single application scenario. Since K and H are both positive integers and K+H≥14, the integration of the driving electromagnetic valve is greatly improved on the basis of meeting the multifunctional driving of the electromagnetic valve, to meet the integration requirement of driving the electromagnetic valve.

[0163] Meanwhile, each first driving module and each second driving module is respectively provided with a first safety diagnosis unit and a second safety diagnosis unit. The first safety diagnosis unit can detect whether the corresponding first driving unit is overcurrent, clamp the output voltage of the corresponding first driving unit, and detect whether the corresponding electromagnetic valve has an open / short circuit. Similarly, the second safety diagnosis unit can also detect whether the corresponding second driving unit is overcurrent, clamp the output voltage of the corresponding second driving unit, and detect whether the corresponding electromagnetic valve has an open / short circuit, thereby greatly improving the safety performance of each driving unit when driving the corresponding electromagnetic valve.

[0164] The technical scheme of the present application also provides an electronic device, which comprises the electromagnetic valve driving chip provided by the technical scheme of the present application.

[0165] Although the present application has been disclosed with reference to the above embodiments, the application is not limited to the above embodiments. It will be apparent to those skilled in the art that various modifications and changes can be made thereto without departing from the spirit and scope of the application. The scope of the application should be limited only by the appended claims.

Claims

1. An electromagnetic valve driving chip, characterized by comprising: The electromagnetic valve driving chip is used for driving a plurality of electromagnetic valves, and comprises: H first driving modules, each of which comprises a first driving unit and a first safety diagnosis unit; each of the first driving units is connected to a corresponding electromagnetic valve, and each of the first driving units is used for high-side driving or low-side driving of the corresponding electromagnetic valve according to a first driving signal; each of the first safety diagnosis units is used for detecting whether the corresponding first driving unit overflows, outputting a first overcurrent detection signal and a second overcurrent detection signal, clamping an output voltage of the corresponding first driving unit, and outputting a voltage clamping signal; and detecting whether the corresponding electromagnetic valve has a breakage or a short circuit, and outputting a breakage or short circuit diagnosis signal, the first overcurrent detection signal corresponding to overcurrent detection when the first driving unit high-side drives the electromagnetic valve, and the second overcurrent detection signal corresponding to overcurrent detection when the first driving unit low-side drives the electromagnetic valve; K second driving modules, each of which comprises a second driving unit and a second safety diagnosis unit, each of the second driving units is connected to a corresponding electromagnetic valve, and each of the second driving units is used for low-side driving of the corresponding electromagnetic valve according to a second driving signal; each of the second safety diagnosis units is used for detecting whether the corresponding second driving unit overflows, outputting a third overcurrent detection signal, clamping an output voltage of the corresponding second driving unit, and outputting a voltage clamping signal; and detecting whether the corresponding electromagnetic valve has a breakage or a short circuit, and outputting a breakage or short circuit diagnosis signal; a control module, which is used for: outputting a corresponding first driving signal to a corresponding first driving unit and a corresponding second driving signal to a corresponding second driving unit according to an input driving control signal; outputting an overcurrent warning signal of the corresponding first driving unit according to the input first overcurrent detection signal and the second overcurrent detection signal, and outputting an overcurrent warning signal of the corresponding second driving unit according to the input third overcurrent detection signal; turning off the corresponding first driving unit and the corresponding second driving unit according to the input voltage clamping signal; and diagnosing a breakage or short circuit type of the corresponding electromagnetic valve according to the breakage or short circuit diagnosis signal, and outputting a breakage or short circuit type signal; wherein the H first driving modules, the K second driving modules and the control module are integrated in the same chip; wherein K and H are positive integers, and K+H≥14.

2. The solenoid valve driving chip according to claim 1, wherein The first driving unit comprises a first driving subunit, a second driving subunit, a first power tube and a second power tube, the input end of the first driving subunit and the input end of the second driving subunit are connected to the control module, the output end of the first driving subunit is connected to the gate of the first power tube, and the output end of the second driving subunit is connected to the gate of the second power tube; the drain of the first power tube is connected to a power supply voltage, the source of the first power tube is connected to the drain of the second power tube; the drain of the second power tube is also connected to the corresponding electromagnetic valve, and the source of the second power tube is connected to a ground terminal.

3. The solenoid valve driving chip according to claim 2, wherein The first safety diagnosis unit comprises a short-circuit detection subunit, a first overcurrent detection subunit, a second overcurrent detection subunit and a voltage clamping subunit. The short-circuit detection subunit is configured to compare the source voltage of the first power tube with a first reference voltage and the source voltage of the first power tube with a second reference voltage respectively when the corresponding power tube is turned off, to realize short-circuit diagnosis of the source of the first power tube, and output a corresponding short-circuit diagnosis signal, wherein the first reference voltage is greater than the second reference voltage. The first overcurrent detection subunit is configured to compare the drain-source voltage of the first power tube with an overcurrent reference voltage, to realize overcurrent detection of the first power tube, and output a corresponding first overcurrent detection signal according to the detection result. The second overcurrent detection subunit is configured to compare the drain voltage of the second power tube with a third reference voltage, to realize overcurrent detection of the second power tube, and output a corresponding second overcurrent detection signal according to the detection result. The voltage clamping subunit is configured to clamp the drain voltage of the second power tube, and output a corresponding voltage clamping signal.

4. The solenoid valve driving chip according to claim 3, wherein The first overcurrent detection subunit comprises a first comparator and a reference voltage source, wherein the non-inverting input terminal of the first comparator is connected to the drain of the first power tube, the inverting input terminal of the first comparator is connected to the positive electrode of the reference voltage source, and the negative electrode of the reference voltage source is connected to the source of the first power tube.

5. The solenoid valve driving chip according to claim 1, wherein The second drive unit comprises a second drive subunit and a second power tube, wherein the input terminal of the second drive subunit is connected to the control module, the output terminal of the second drive subunit is connected to the gate of the second power tube, the drain of the second power tube is connected to the corresponding electromagnetic valve, and the source of the second power tube is connected to the ground terminal.

6. The solenoid valve driving chip according to claim 5, wherein The second safety diagnosis unit comprises a short-circuit detection subunit, a second overcurrent detection subunit and a voltage clamping subunit. The short-circuit detection subunit is configured to compare the drain voltage of the second power tube with a first reference voltage and the drain voltage of the second power tube with a second reference voltage, to realize short-circuit diagnosis of the drain of the second power tube, and output a corresponding short-circuit diagnosis signal, wherein the first reference voltage is greater than the second reference voltage. The second overcurrent detection subunit is configured to compare the drain voltage of the second power tube with a third reference voltage, to realize overcurrent detection of the second power tube, and output a corresponding third overcurrent detection signal according to the detection result. The voltage clamping subunit is configured to clamp the drain voltage of the second power tube, and output a corresponding voltage clamping signal.

7. The solenoid valve driving chip according to claim 3 or 6, characterized by The first safety diagnosis unit and the second safety diagnosis unit both comprise the short-circuit detection subunit, and the short-circuit detection subunit comprises a first operational amplifier, a second comparator and a third comparator. An output terminal of the first operational amplifier is connected to a drain of the second power tube and an inverting input terminal of itself, a non-inverting input terminal of the first operational amplifier is connected to a first voltage, and the first voltage is used to represent a voltage of the drain of the second power tube when the electromagnetic valve is open. An inverting input terminal of the second comparator and an inverting input terminal of the third comparator are both connected to the inverting input terminal of the first operational amplifier, a non-inverting input terminal of the second comparator is connected to the first reference voltage, and a non-inverting input terminal of the third comparator is connected to the second reference voltage. The first reference voltage is greater than the first voltage, and the first voltage is greater than the second reference voltage.

8. The solenoid valve driving chip according to claim 3, wherein The open-short circuit detection subunit comprises a first switch, a second switch, a first current source, a second current source, a first resistor, a second resistor, a fourth comparator, and a fifth comparator. A first terminal of the first switch is connected to a power supply voltage, and a second terminal of the first switch is connected to a first terminal of the first resistor. The first resistor, the first current source, the second switch, the second current source, and the second resistor are connected in series, a positive electrode of the second current source is further connected to a drain of the second power tube, and a second terminal of the second resistor is connected to a ground terminal. A non-inverting input terminal of the fourth comparator is connected to the second terminal of the first resistor, an inverting input terminal of the fourth comparator is connected to the first reference voltage, an inverting input terminal of the fifth comparator is connected to a first terminal of the second resistor, a non-inverting input terminal of the fifth comparator is connected to the second reference voltage, an output terminal of the fourth comparator and an output terminal of the fifth comparator are both used as output terminals of the open-short circuit detection subunit. The first switch and the second switch are both turned off when a corresponding electromagnetic valve is turned on, the first switch is turned on when a corresponding electromagnetic valve is turned off and is driven by a high side, and the second switch is turned on when a corresponding electromagnetic valve is turned off and is driven by a low side.

9. The solenoid valve driving chip according to claim 3 or 6, characterized by The first safety diagnosis unit and the second safety diagnosis unit both comprise the second overcurrent detection subunit, and the second overcurrent detection subunit comprises a third resistor, a third power tube, a fourth resistor, and a sixth comparator. A first terminal of the third resistor is connected to a drain of the second power tube, and a second terminal of the third resistor is connected to a drain of the third power tube. A gate of the third power tube is connected to a gate of the second power tube and an output terminal of the second drive subunit, and a source of the third power tube is connected to a first terminal of the fourth resistor. A non-inverting input terminal of the sixth comparator is connected to the source of the third power tube, an inverting input terminal of the sixth comparator is connected to the third reference voltage, and an output terminal of the sixth comparator is used as an output terminal of the second overcurrent detection subunit. A second terminal of the fourth resistor is connected to a ground terminal. The size of the third power tube is proportional to the size of the second power tube.

10. The solenoid valve driving chip according to claim 3 or 6, characterized by The first safety diagnosis unit and the second safety diagnosis unit each include the second overcurrent detection subunit, and the second overcurrent detection subunit includes a fourth power tube, a third current source, and a seventh comparator. The negative electrode of the third current source is connected to a power supply voltage, and the positive electrode of the third current source is connected to the inverting input terminal of the seventh comparator. The non-inverting input terminal of the seventh comparator is connected to the drain of the second power tube, and the output terminal of the seventh comparator serves as the output terminal of the second overcurrent detection subunit. The drain of the fourth power tube is connected to the positive electrode of the third current source, the gate of the fourth power tube is connected to the gate of the second power tube, the source of the fourth power tube is connected to a ground terminal, and the size ratio of the fourth power tube to the second power tube is 1 / L; L is a positive integer, and L is greater than 1.

11. The solenoid valve driving chip according to claim 3 or 6, characterized by The first safety diagnosis unit and the second safety diagnosis unit each include the voltage clamping subunit, and the voltage clamping subunit includes a Zener diode, a fifth resistor, a sixth resistor, and a buffer. The negative electrode of the Zener diode is connected to the drain of the second power tube, and the positive electrode of the Zener diode is connected to the first end of the fifth resistor. The second end of the fifth resistor is connected to the first end of the sixth resistor, and the second end of the sixth resistor is connected to the gate of the second power tube. The input terminal of the buffer is connected to the second end of the fifth resistor, and the output terminal of the buffer serves as the output terminal of the voltage clamping subunit.

12. An electronic device, comprising: The electronic device includes the electromagnetic valve driving chip according to any one of claims 1 to 11.

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