Electromagnetic valve driving chip and electronic equipment

Abstract

The invention provides an electromagnetic valve driving chip and electronic equipment. The chip comprises H first driving modules, K second driving modules and a control module, the H first driving units are arranged to carry out high-side driving or low-side driving on the H electromagnetic valves, the K second driving units are arranged to carry out low-side driving on the K electromagnetic valves, and H + K is set to be larger than or equal to 14, so that the requirement for the integration level of driving the electromagnetic valves is met on the basis that the requirement for multifunctional driving of the electromagnetic valves is met. Meanwhile, each first driving unit and each second driving unit are respectively provided with a first safety diagnosis unit and a second safety diagnosis unit, so that overcurrent detection, voltage clamping and open and short circuit detection of the first driving unit are realized, and overcurrent detection, voltage clamping and open and short circuit detection of the second driving unit are realized; therefore, the safety performance of the electromagnetic valve driving chip is greatly improved.

Description

Technical Field

[0001] The present invention relates to the field of electronic circuit design, and in particular to a solenoid valve drive chip and electronic equipment. Background Art

[0002] With the continuous development of intelligent driving, intelligent chassis-by-wire technology has become an important support for the development of automobile intelligence. The core of intelligent chassis-by-wire technology is to achieve precise control of the vehicle by replacing traditional mechanical signals with electrical signals. This technology can significantly improve the vehicle's safety, driving experience, and control capabilities for performing advanced functions such as autonomous driving.

[0003] In order to achieve systematic control of the vehicle, the intelligent drive-by-wire chassis technology usually needs to control multiple solenoid valves, and each solenoid valve corresponds to a driving path. However, the solenoid valve driver chip in the existing technology cannot meet the requirements of the intelligent drive-by-wire chassis technology for systematic control of the vehicle due to its low integration and low safety factor.

[0004] Therefore, providing a solenoid valve driver chip with high integration and high safety factor has become a technical problem that the industry urgently needs to solve. Summary of the invention

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

[0006] In order to solve the above technical problems, the technical solution of the present invention provides a solenoid valve driving chip, the solenoid valve driving chip is used to drive a plurality of solenoid valves, and the solenoid valve driving chip includes:

[0007] H first drive modules, each of which includes a first drive unit and a first safety diagnosis unit; each of the first drive units is connected to a corresponding solenoid valve, and each of the first drive units is used to perform high-side drive or low-side drive on the corresponding solenoid valve according to a first drive signal; each of the first safety diagnosis units is used to detect whether the corresponding first drive unit has an overcurrent, and output a first overcurrent detection signal and a second overcurrent detection signal, clamp the output voltage of the corresponding first drive unit, and output a voltage clamping signal; and detect whether the corresponding solenoid valve has a short circuit, and output a short circuit diagnosis signal;

[0008] K second drive modules, each of which includes a second drive unit and a second safety diagnosis unit, each of which is connected to a corresponding solenoid valve, and each of which is used to drive the corresponding solenoid valve at a low side according to a second drive signal; each of which is used to detect whether the corresponding second drive unit has an overcurrent, and output a second overcurrent detection signal, clamp the output voltage of the corresponding second drive unit, and output a voltage clamping signal; and detect whether the corresponding solenoid valve has a short circuit, and output a short circuit diagnosis signal;

[0009] A control module, wherein the control module is used to:

[0010] According to the input driving control signal, outputting a corresponding first driving signal to a corresponding first driving unit, and outputting a corresponding second driving signal to a corresponding second driving unit;

[0011] Outputting an overcurrent warning signal corresponding to the first drive unit and an overcurrent warning signal corresponding to the second drive unit according to the first overcurrent detection signal and the second overcurrent detection signal input;

[0012] According to the input voltage clamping signal, the corresponding first driving unit and the corresponding second driving unit are turned off respectively; and

[0013] According to the short-circuit diagnostic signal, diagnose the short-circuit type of the corresponding solenoid valve, and output the short-circuit type signal externally;

[0014] Wherein, the H first driving modules, the K second driving modules and the control module are all integrated in the same chip;

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

[0016] Optionally, the first driving unit includes: a first driving sub-unit, a second driving sub-unit, a first power tube and a second power tube, the input end of the first driving sub-unit and the input end of the second driving sub-unit are both connected to the control module, the output end of the first driving sub-unit is connected to the gate of the first power tube, and the output end of the second driving sub-unit is connected to the gate of the second power tube; the drain of the first power tube is connected to the power supply voltage, and 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 solenoid valve, and the source of the second power tube is connected to the ground.

[0017] Optionally, the first safety diagnosis unit includes: a short circuit detection subunit, a first overcurrent detection subunit, a second overcurrent detection subunit and a voltage clamping subunit;

[0018] The short-circuit detection subunit is used to implement short-circuit diagnosis of the drain of the second power tube by comparing the drain voltage of the first power tube, the first reference voltage and the second reference voltage when the corresponding power tube is turned off, and output a corresponding short-circuit diagnosis signal, and the first reference voltage is greater than the second reference voltage;

[0019] The first overcurrent detection subunit is used to compare the source voltage and the drain voltage of the first power tube to perform overcurrent detection on the first power tube, and output a corresponding first overcurrent detection signal according to the detection result;

[0020] The second overcurrent detection subunit is used to compare the drain voltage of the second power tube with the third reference voltage to perform overcurrent detection on the second power tube, and output a corresponding second overcurrent detection signal according to the detection result;

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

[0022] Optionally, the first overcurrent detection subunit includes: a first comparator and a reference voltage source; 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 driving unit includes: a second driving sub-unit and a second power tube, the input end of the second driving sub-unit is connected to the control module, the output end of the second driving sub-unit is connected to the gate of the second power tube, the drain of the second power tube is connected to the corresponding solenoid valve, and the source of the second power tube is connected to the ground.

[0024] Optionally, the second safety diagnosis unit includes: a short circuit detection subunit, a second overcurrent detection subunit and a voltage clamping subunit;

[0025] The short circuit detection subunit is used to compare the drain voltage of the second power tube, the first reference voltage and the second reference voltage to implement 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;

[0026] The second overcurrent detection subunit is used to compare the drain voltage of the second power tube with the third reference voltage to perform overcurrent detection on the second power tube, and output a corresponding second overcurrent detection signal according to the detection result;

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

[0028] Optionally, the short circuit detection subunit includes: 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 its own inverting input end, and 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 disconnected;

[0030] The inverting input terminal of the second comparator and the inverting input terminal of the third comparator are both connected to the inverting input terminal of the first operational amplifier, the non-inverting input terminal of the second comparator is connected to the first reference voltage, the non-inverting input terminal of the third comparator is connected to the second reference voltage, and the output terminal of the second comparator and the output terminal of the third comparator are both used as the output terminal of the short circuit 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 short circuit detection subunit further includes: 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] A first end of the first switch is connected to a power supply voltage, and a second end of the first switch is connected to a 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 in sequence, the positive electrode of the second current source is also connected to the drain of the second power tube, and the second end of the second resistor is connected to the ground;

[0035] The non-inverting input terminal of the fourth comparator is connected to the second terminal of the first resistor, and the inverting input terminal of the fourth comparator is connected to the first reference voltage; the inverting input terminal of the fifth comparator is connected to the first terminal of the second resistor, and the non-inverting input terminal of the fifth comparator is connected to the second reference voltage; the output terminal of the fourth comparator and the output terminal of the fifth comparator are both used as the output terminal of the short circuit 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 driven by the high side, and the second switch is turned on when the corresponding solenoid valve is turned off and driven by the low side.

[0037] Optionally, the second overcurrent detection subunit includes a third resistor, a third power tube, a fourth resistor and a sixth comparator;

[0038] A first end of the third resistor is connected to the drain of the second power tube, and a 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 sub-unit, and the source of the third power tube is connected to the first end of the fourth resistor;

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

[0041] A second end of the fourth resistor is grounded;

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

[0043] Optionally, the first overcurrent detection subunit and the second overcurrent detection subunit both further include: a fourth power tube, a third current source and a seventh comparator;

[0044] The negative electrode of the third current source is connected to the power supply voltage, and the positive electrode of the third current source is connected to the inverting input terminal of the seventh comparator;

[0045] 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 over-current detection sub-unit;

[0046] 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 the 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.

[0047] Optionally, the voltage clamping subunit includes: a Zener diode, a fifth resistor, a sixth resistor and a buffer;

[0048] The cathode of the Zener diode is connected to the drain of the second power tube, and the anode 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 to the second end of the fifth resistor, and the output end of the buffer serves as the output end of the voltage clamping subunit.

[0051] The technical solution of the present invention further provides an electronic device, and the electronic device includes the solenoid valve driving chip provided by the technical solution of the present invention.

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

[0053] In the solenoid valve driver chip of the technical solution of the present invention, H first drive units are set to perform high-side drive or low-side drive on H solenoid valves respectively, and K second drive units are set to perform low-side drive on K solenoid valves respectively, and H+K is set to be greater than or equal to 14, so that on the basis of meeting the multifunctional drive of the solenoid valve, the integration requirements of the driving solenoid valve are met. At the same time, a first safety diagnostic unit and a second safety diagnostic unit are respectively set for each first drive unit and each second drive unit to realize overcurrent detection, voltage clamping and short-circuit detection of the first drive unit, and to realize overcurrent detection, voltage clamping and short-circuit detection of the second drive unit, thereby greatly improving the safety performance of the solenoid valve driver chip. Since the solenoid valve driver chip of the present invention meets both the integration requirements of the driving solenoid valve and the high safety performance, it greatly improves the performance of the intelligent wire-controlled chassis technology in systematic control of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 A schematic diagram of a circuit module of a solenoid valve driving chip provided by the technical solution of the present invention;

[0055] Figures 2 to 5 The circuit structure diagram of the solenoid valve drive chip provided by the technical solution of the present invention is shown in FIG. Figures 1 to 4 . DETAILED DESCRIPTION

[0056] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention. The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0057] A solenoid valve is a device that uses electromagnetic principles to control the flow of media (such as liquids, gases, etc.). Its working principle mainly includes two aspects: electromagnetic force drive and medium control. When the electromagnet coil is energized, the magnetic field generated will cause the piston or valve core to move, thereby changing the flow state of the medium. By controlling the size and direction of the electromagnetic force, the on-off control, regulation control or diversion control of the medium flow can be achieved.

[0058] However, the solenoid valve driver chip of the prior art usually has only 8 or 12 drive channels, which cannot meet the integration requirements of the solenoid valve drive. At the same time, the solenoid valve driver chip of the prior art only has a short-circuit detection function of the drive channel, which cannot meet the application scenarios with high safety performance.

[0059] In view of this, the technical solution of the present invention provides a new solenoid valve driving chip, and the solenoid valve driving chip is used to drive a plurality of solenoid valves.

[0060] in, Figure 1 A schematic diagram of the circuit module of the solenoid valve driver chip provided by the technical solution of the present invention.

[0061] Please refer to Figure 1 The solenoid valve driving chip provided by the technical solution of the present invention includes:

[0062] H first drive modules 100, each of which includes a first drive unit 102 and a first safety diagnosis unit 101; each of the first drive units 102 is connected to a corresponding solenoid valve, and each of the first drive units 102 is used to perform high-side drive or low-side drive on the corresponding solenoid valve according to a first drive signal; each of the first safety diagnosis units 101 is used to detect whether the corresponding first drive unit 102 is overcurrent, and output a first overcurrent detection signal and a second overcurrent detection signal; clamp the output voltage of the corresponding first drive unit 102, and output a voltage clamping signal; and detect whether the corresponding solenoid valve is short-circuited, and output a short-circuit diagnosis signal;

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

[0064] K second drive modules 200, each of the second drive modules 200 includes a second drive unit 202 and a second safety diagnosis unit 201, each of the second drive units 202 is connected to a corresponding solenoid valve, and each of the second drive units 202 is used to perform low-side drive on the corresponding solenoid valve according to a second drive signal; each of the second safety diagnosis units 201 is used to detect whether the corresponding second drive unit 202 has an overcurrent, and output a second overcurrent detection signal; clamp the output voltage of the corresponding second drive unit 202, and output a voltage clamping signal; and detect whether the corresponding solenoid valve has a short circuit, and output a short circuit diagnosis signal;

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

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

[0067] The control module 300 is used for:

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

[0069] Outputting an over-current warning signal Vb corresponding to the first driving unit 102 and an over-current warning signal Vb corresponding to the second driving unit 202 according to the first over-current detection signal and the second over-current detection signal;

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

[0071] According to the short-circuit diagnostic signal, diagnose the short-circuit type of the corresponding solenoid valve, and output a short-circuit type signal Vc to the outside;

[0072] Among them, H first driving modules 100, K second driving modules 200 and the control module 300 are all integrated in the same chip;

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

[0074] Through the above technical means, the technical solution of the present invention can not only meet the integration requirements of the driving solenoid valve but also achieve high safety performance of the driving solenoid valve, thereby greatly improving the performance of the intelligent wire-controlled chassis technology in systematic control of the vehicle. The specific principle is as follows:

[0075] The solenoid valve driver chip of the present invention is provided with H first driver modules 100, and each first driver module 100 is provided with a first driver unit 102 corresponding to the solenoid valve one by one, so as to realize high-side drive or low-side drive of the corresponding solenoid valve in different application scenarios. The solenoid valve driver chip of the present invention is also provided with K second driver modules 200, and each second driver module 200 is provided with a second driver unit 202 corresponding to the solenoid valve one by one, so as to realize low-side drive of the corresponding solenoid valve in a single application scenario. Since K and H are both positive integers, and K+H≥14, the integration of the driving solenoid valve is greatly improved on the basis of satisfying the multifunctional drive of the solenoid valve, so as to meet the integration requirements of the driving solenoid valve.

[0076] At the same time, each first drive module 100 and each second drive module 200 are respectively provided with a first safety diagnostic unit 101 and a second safety diagnostic unit 201, wherein the first safety diagnostic unit 101 can detect whether the corresponding first drive unit 102 is overcurrent, clamp the output voltage of the corresponding first drive unit 102, and detect whether the corresponding solenoid valve is short-circuited. Similarly, the second safety diagnostic 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 solenoid valve is short-circuited, thereby greatly improving the safety performance of each drive unit when driving the corresponding solenoid valve.

[0077] Based on the above technical means, the technical solution of the present invention can not only meet the integration requirements of the driving solenoid valve but also achieve high safety performance of the solenoid valve driving, thereby greatly improving the performance of the intelligent wire-controlled chassis technology for systematic control of the vehicle.

[0078] In order to make the above-mentioned objects, features and beneficial effects of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0079] in, Figures 2 to 5 The circuit structure diagram of the solenoid valve drive chip provided by the technical solution of the present invention is shown in FIG. Figures 1 to 4 .

[0080] Please refer to Figure 2 As a specific implementation, the first driving unit 102 includes: a first driving subunit 1021, a second driving subunit 1022, a first power tube M1 and a second power tube M2, the input end of the first driving subunit 1021 and the input end of the second driving subunit 1022 are both connected to the control module 300, the output end of the first driving subunit 1021 is connected to the gate of the first power tube M1, and the output end of the second driving subunit 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 solenoid valve, and the source of the second power tube M2 is connected to the ground.

[0081] The first drive unit 102 can drive the corresponding solenoid valve at the high side through the first drive subunit 1021 and the first power tube M1, and can drive the corresponding solenoid valve at the low side through the second drive subunit 1022 and the second power tube M2, thereby meeting the driving requirements of the corresponding solenoid valve in different application scenarios. The specific driving mode of the corresponding solenoid valve is regulated 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 subunit 1011, a first overcurrent detection subunit 1012, a second overcurrent detection subunit 1013 and a voltage clamping subunit 1014;

[0083] When the first power tube M1 drives the corresponding solenoid valve at the high side, and when the second power tube M2 drives the corresponding solenoid valve at the low side, both the first power tube M1 and the second power tube M2 may have overcurrent. Therefore, the first overcurrent detection subunit 1012 is set to compare the drain-source voltage of the first power tube M1 with the overcurrent reference voltage to perform overcurrent detection on 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 set to compare the drain voltage of the second power tube M2 with the third reference voltage VREF3 to perform overcurrent detection on the second power tube M2, and output a corresponding second overcurrent detection signal according to the detection result. After receiving the first overcurrent detection signal or the second overcurrent detection signal, the control module 300 will output a shutdown signal to the first driving module with the overcurrent power tube, so that the corresponding driving unit in the first driving module turns off the overcurrent power tube.

[0084] Although the control module 300 will shut down the first power tube M1 or the second power tube M2 when there is an overcurrent, the first power tube M1 or the second power tube M2 may not be shut down due to a short circuit in the drain of the second power tube M2. Therefore, after the first power tube M1 or the second power tube M2 has an overcurrent and is shut down, the short circuit detection subunit 1011 compares the drain voltage of the second power tube M2, 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 performs short circuit diagnosis on the drain of the second power tube M2 according to the high side drive or low side drive of the solenoid valve and the first short circuit detection signal.

[0085] In addition to short-circuit detection of the drain of the second power tube M2 and overcurrent detection of the first power tube M1 and the second power tube M2, when the solenoid valve is driven from on to off, the drain voltage of the second power tube M2 is often increased due to the energy carried by the inductor in the solenoid valve, so the voltage clamping subunit 1014 is set to clamp the drain voltage of the second power tube M2 and output a corresponding voltage clamping signal. The control module 300 is also used to turn on the corresponding second power tube M2 according to the input voltage clamping signal to discharge the charge of the drain of the second power tube M2 to the ground terminal, thereby reducing the drain voltage of the second power tube M2.

[0086] The following Figure 3 Taking the illustrated embodiment as an example, each subunit in the first safety diagnosis unit 101 is described in detail:

[0087] Please refer to Figure 3 ,exist Figure 3 In the illustrated embodiment, the 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 its own inverting input end, and 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 solenoid valve is disconnected;

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

[0090] 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 short circuit detection subunit 1011 is:

[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 terminal. When the first power tube M1 is short-circuited, the first power tube M1 is turned off.

[0093] If the drain of the second power tube M2 is short-circuited, 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. Because the inverting input terminal of the second comparator ap2 and the inverting input terminal 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 a low level.

[0094] If the drain of the second power tube M2 is open circuited, the inverting input of the second comparator ap2 and the inverting input of the third comparator ap3 will both be connected to the first voltage due to the virtual short of the first operational amplifier op 1. And because 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 tube M2 is short-circuited to the power supply, the inverting input terminals of the second comparator ap2 and the third comparator ap3 will both be 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 tube M2. When the second power tube M2 is short-circuited, the second power tube M2 is turned off.

[0097] When the second power tube M2 is short-circuited, the second power tube M2 is turned off. If the drain of the second power tube M2 is not short-circuited, the inverting input terminal of the second comparator ap2 and the inverting input terminal 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 tube M2 is disconnected, the inverting input of the second comparator ap2 and the inverting input of the third comparator ap3 will both be connected to the first voltage due to the virtual short of the first operational amplifier op1. And because 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 tube M2 is short-circuited to the ground, the drain voltage of the second power tube M2 will be close to the ground and will be smaller than the first reference voltage VREF1 and the second reference voltage VREF2. Because the inverting input terminal of the second comparator ap2 and the inverting input terminal 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 a high level.

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

[0101] If the solenoid valve is a high-side drive, the logic control module 130 can determine that the drain of the second power tube M2 is not short-circuited according to the second comparator ap2 and the third comparator ap3 both outputting high levels. The logic control module 130 can also determine that the drain of the second power tube M2 is short-circuited to the power supply according to the second comparator ap2 and the third comparator ap3 both outputting low-high levels.

[0102] If the solenoid valve is a low-side drive, the logic control module 130 can determine that the drain of the second power tube M2 is not short-circuited according to the second comparator ap2 and the third comparator ap3 both outputting a low level. The logic control module 130 can also determine that the drain of the second power tube M2 is short-circuited to the ground according to the second comparator ap2 and the third comparator ap3 both outputting a high level.

[0103] Of course, the connection objects of the in-phase input terminal and the inverting input terminal of the second comparator ap2 and the third comparator ap3 can also be interchanged, so that the short-circuit judgment of the solenoid valve also needs to be adaptively changed, which will not be elaborated here.

[0104] The short circuit detection subunit 101 in the first safety diagnosis unit 101 is Figure 3 In addition to the embodiments shown, there are other embodiments, please refer to Figure 4 .

[0105] Please refer to Figure 4 ,exist Figure 4 In the illustrated embodiment, the short circuit 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] A first end of the first switch SW1 is connected to a power supply voltage, and a second end of the first switch SW1 is connected to a 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 in sequence, the positive electrode 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 grounded;

[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 VREF1; 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 used as the output terminal of the short circuit detection subunit 1011;

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

[0110] In this embodiment, the working principle of the short circuit detection subunit 1011 is as follows:

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

[0112] When the solenoid 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 the process of driving the solenoid valve.

[0113] When the first power tube M1 is short-circuited, both the first power tube M1 and the second power tube M2 are 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 the source of the first power tube M1 is not open or short-circuited, the negative electrode of the first current source Isource1 will be pulled down to the ground due to the source of the first power tube M1, and the fourth comparator ap4 outputs a 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 a 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 the source of the first power tube M1 is not open or short-circuited, the positive electrode of the second current source Isource2 is pulled close to the ground, and the fifth comparator ap5 outputs a high level. If the source of the first power tube M1 is short-circuited to the power supply, the positive electrode of the second current source Isource2 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 a low level.

[0116] Finally, according to the low level output of the fourth comparator ap4 in the first stage and the high level output of the fifth comparator ap5 in the second stage, it is determined that the source of the first power tube M1 is not open or short-circuited. And according to the low level output of the fourth comparator ap4 in the first stage and the low level output of the fifth comparator ap5 in the second stage, it is determined that the source of the first power tube M1 is short-circuited to the power supply.

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

[0118] When the solenoid 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 the process of driving the solenoid valve.

[0119] When the second power tube M2 is short-circuited, both the first power tube M1 and the second power tube M2 are 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 the drain of the second power tube M2 is not open or short-circuited, the negative electrode of the first current source Isource1 will be connected to the power supply voltage VBAT due to the drain of the second power tube M2, and the fourth comparator ap4 outputs a low level. If the drain of the second power tube M2 is short-circuited to the ground, the negative electrode of the first current source Isource1 will be connected to the ground due to the drain of the second power tube 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 tube M2 is not open or short-circuited, the positive electrode of the second current source Isource2 is pulled close to the power supply voltage VBAT, and the fifth comparator ap5 outputs a low level. If the drain of the second power tube M2 is short-circuited to the ground, the positive electrode of the second current source Isource2 will be connected to the ground due to the drain of the second power tube M2, and the fourth comparator ap4 will output a high level.

[0122] Finally, according to the low level output of the fourth comparator ap4 in the first stage and the low level output of the fifth comparator ap5 in the second stage, it is determined that the drain of the second power tube M2 is not open or short-circuited. And according to the low level output of the fourth comparator ap4 in the first stage and the high level output of the fifth comparator ap5 in the second stage, it is determined that the drain of the second power tube M2 is short-circuited to the ground.

[0123] Of course, the connection objects of the in-phase input terminal and the inverting input terminal of the fourth comparator ap4 and the fifth comparator ap5 can also be interchanged, so that the circuit-breaking judgment of the solenoid valve also needs to be adaptively changed, which will not be elaborated here.

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

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

[0126] The non-inverting input terminal of the first comparator ap1 is connected to the drain of the first power tube M1, and the inverting input terminal of the first comparator ap1 is connected to the source of the first power tube M1 through the reference voltage source Vsource. Therefore, when the first power tube M1 is normally turned on, the voltage at the inverting input terminal of the first comparator ap1 will be higher than the voltage at the non-inverting input terminal, that is, the first comparator ap1 outputs a low level to indicate that the first power tube M1 is not over-current. However, when the source voltage of the first power tube M1 drops to a level that makes the voltage at the non-inverting input terminal of the first comparator ap1 greater than the voltage at the inverting input terminal, the first comparator ap1 outputs a high level to indicate that the first power tube M1 is over-current.

[0127] Of course, the connection modes of the in-phase input terminal and the inverting input terminal of the first comparator ap1 can also be interchanged, so that the overcurrent determination of the first power tube M1 also needs to be changed, which will not be elaborated here.

[0128] Please refer to Figure 3 ,exist Figure 3 In the illustrated embodiment, 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] A first end of the third resistor R3 is connected to the drain of the second power tube M2, and a 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 end of the second driving sub-unit 1022, and the source of the third power tube M3 is connected to the first end of the fourth resistor R4;

[0131] The in-phase input terminal of the sixth comparator ap6 is connected to the source of the third power tube M3, the inverting input terminal of the sixth comparator ap6 is connected to the third reference voltage VREF3, and the output terminal of the sixth comparator ap6 serves as the output terminal of the second over-current detection subunit 1013;

[0132] A second end of the fourth resistor R4 is grounded;

[0133] 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 critical point. Of course, the overcurrent critical point can be adaptively set according to different application scenarios and is not limited here.

[0135] In this implementation, 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 being proportionally reduced to the path where the third power tube M3 is located.

[0137] Furthermore, since 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 tube 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 tube M2 is not over-current. When the sixth comparator ap6 outputs a high level, it indicates to the control module 300 that the current flowing through the second power tube M2 is over-current.

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

[0139] Of course, the connection objects of the in-phase input terminal and the inverting input terminal of the sixth comparator ap6 can also be interchanged, so that the overcurrent judgment of the seventh power tube also needs to be adaptively changed, which will not be repeated here.

[0140] It should be supplemented that the first overcurrent detection subunit 1012 and the second overcurrent detection subunit 1013 in the first safety diagnosis unit 101 are Figure 3 In addition to the embodiments shown, there are other embodiments, please refer to Figure 5 .

[0141] Please refer to Figure 5 ,exist Figure 5 In the illustrated embodiment, the first overcurrent detection subunit 1012 and the second overcurrent detection subunit 1013 both include: a fourth power tube M4, a third current source Isource3 and a seventh comparator ap7;

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

[0143] The in-phase input terminal of the seventh comparator ap7 is connected to the drain of the second power tube M2, and the output terminal of the seventh comparator ap7 serves as the output terminal of the second over-current detection subunit 1013;

[0144] The drain of the fourth power tube M4 is connected to the positive electrode 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 to the second power tube M2 is 1 / L, wherein 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 is 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 over-currented.

[0147] Because 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 positive electrode of the third current source Isource3, by comparing the drain voltage of the second power tube M2 with the reference voltage, it is possible to detect whether the second power tube M2 is overcurrent.

[0148] Please refer to Figure 3 ,exist Figure 3 In the illustrated 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 cathode of the Zener diode D1 is connected to the drain of the second power tube M2, and the anode 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, that is, when 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 is accumulated at the gate of the second power tube M2 to increase the gate voltage of the second power tube M2. The increase in 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 increase, thereby achieving the 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 divider circuit composed of the fifth resistor R5, the sixth resistor R6 and the buffer, so as to determine whether the drain of the second power tube M2 is overvoltage through the control module 300.

[0154] Please refer to Figure 2 As a specific implementation, the second driving unit includes: a second driving sub-unit 2022 and a second power tube M2, the input end of the second driving sub-unit 2022 is connected to the control module 300, the output end of the second driving 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 solenoid valve, and the source of the second power tube M2 is connected to the ground end.

[0155] Wherein, the second driving unit is only used for performing low-side driving on the corresponding solenoid valve.

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

[0157] Functionally, the short-circuit detection subunit 2011, the second overcurrent detection subunit 2013 and the voltage clamping subunit 2014 in the second safety diagnostic unit have the same functions as the short-circuit detection subunit 2011, the second overcurrent detection subunit 2013 and the voltage clamping subunit 2014 in the first safety diagnostic unit, and are not repeated here.

[0158] In a specific implementation manner, the short circuit detection subunit 2011, the second overcurrent detection subunit 2013 and the voltage clamping subunit 2014 in the second safety diagnosis unit are also connected to Figure 3 In the illustrated embodiment, the short circuit detection subunit 2011, the second overcurrent detection subunit 2013 and the voltage clamping subunit 2014 in the first safety diagnosis unit have the same circuit structure and working principle, which will not be described in detail herein.

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

[0160] The specific implementation of the short circuit detection subunit 2011 of the second safety diagnosis unit may also include: Figure 4 The second switch SW2, the second current source Isource2, the fifth comparator ap5 and the second resistor R2 in the embodiment shown in the figure are shown in the figure. Figure 4 The embodiments shown are the same and 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 Figure 5 The second over-current detection subunit 2013 of the first safety diagnosis unit in the illustrated embodiment is the same and will not be described in detail herein.

[0162] In summary, the solenoid valve driver chip provided in the embodiment of the present invention is provided with H first driver modules, each of which is provided with a first driver unit corresponding to the solenoid valve one by one, so as to realize high-side drive or low-side drive of the corresponding solenoid valve in different application scenarios. The solenoid valve driver chip of the present invention is also provided with K second driver modules, each of which is provided with a second driver unit corresponding to the solenoid valve one by one, so as to realize low-side drive of the corresponding solenoid valve in a single application scenario. Since K and H are both positive integers, and K+H≥14, the integration of the driving solenoid valve is greatly improved on the basis of satisfying the multi-functional drive of the solenoid valve, so as to meet the integration requirements of the driving solenoid valve.

[0163] At the same time, each first drive module and each second drive module are respectively provided with a first safety diagnostic unit and a second safety diagnostic unit, wherein the first safety diagnostic unit can detect whether the corresponding first drive unit is overcurrent, clamp the output voltage of the corresponding first drive unit, and detect whether the corresponding solenoid valve is short-circuited. Similarly, the second safety diagnostic unit can also detect whether the corresponding second drive unit is overcurrent, clamp the output voltage of the corresponding second drive unit, and detect whether the corresponding solenoid valve is short-circuited, thereby greatly improving the safety performance of each drive unit when driving the corresponding solenoid valve.

[0164] The technical solution of the present invention further provides an electronic device, and the electronic device includes the solenoid valve driving chip provided by the technical solution of the present invention.

[0165] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the claims.

Claims

1. A solenoid valve driver chip, characterized in that: The solenoid valve driving chip is used to drive a plurality of solenoid valves, and the solenoid valve driving chip includes: H first drive modules, each of which includes a first drive unit and a first safety diagnosis unit; each of the first drive units is connected to a corresponding solenoid valve, and each of the first drive units is used to perform high-side drive or low-side drive on the corresponding solenoid valve according to a first drive signal; each of the first safety diagnosis units is used to detect whether the corresponding first drive unit has an overcurrent, and output a first overcurrent detection signal and a second overcurrent detection signal, clamp the output voltage of the corresponding first drive unit, and output a voltage clamping signal; and detect whether the corresponding solenoid valve has a short circuit, and output a short circuit diagnosis signal; K second drive modules, each of which includes a second drive unit and a second safety diagnosis unit, each of which is connected to a corresponding solenoid valve, and each of which is used to drive the corresponding solenoid valve at a low side according to a second drive signal; each of which is used to detect whether the corresponding second drive unit has an overcurrent, and output a second overcurrent detection signal, clamp the output voltage of the corresponding second drive unit, and output a voltage clamping signal; and detect whether the corresponding solenoid valve has a short circuit, and output a short circuit diagnosis signal; A control module, wherein the control module is used to: According to the input driving control signal, outputting a corresponding first driving signal to a corresponding first driving unit, and outputting a corresponding second driving signal to a corresponding second driving unit; Outputting an overcurrent warning signal corresponding to the first drive unit and an overcurrent warning signal corresponding to the second drive unit according to the first overcurrent detection signal and the second overcurrent detection signal input; According to the input voltage clamping signal, the corresponding first driving unit and the corresponding second driving unit are turned off respectively; and According to the short-circuit diagnostic signal, diagnose the short-circuit type of the corresponding solenoid valve, and output the short-circuit type signal externally; Wherein, the H first driving modules, the K second driving modules and the control module are all integrated in the same chip; Wherein, K and H are both positive integers, and K+H≥14.

2. The solenoid valve driver chip according to claim 1, characterized in that: The first driving unit includes: a first driving sub-unit, a second driving sub-unit, a first power tube and a second power tube, the input end of the first driving sub-unit and the input end of the second driving sub-unit are both connected to the control module, the output end of the first driving sub-unit is connected to the gate of the first power tube, and the output end of the second driving sub-unit is connected to the gate of the second power tube; the drain of the first power tube is connected to the power supply voltage, and 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 solenoid valve, and the source of the second power tube is connected to the ground.

3. The solenoid valve driver chip according to claim 2, characterized in that: The first safety diagnosis unit includes: 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 used to implement short-circuit diagnosis of the source of the first power tube by comparing the drain voltage of the first power tube, the first reference voltage and the second reference voltage when the corresponding power tube is turned off, and output a corresponding short-circuit diagnosis signal, and the first reference voltage is greater than the second reference voltage; The first overcurrent detection subunit is used to compare the drain-source voltage of the first power tube with the overcurrent reference voltage to perform overcurrent detection on the first power tube, and output a corresponding first overcurrent detection signal according to the detection result; The second overcurrent detection subunit is used to compare the drain voltage of the second power tube with the third reference voltage to perform overcurrent detection on the second power tube, and output a corresponding second overcurrent detection signal according to the detection result; The voltage clamping subunit is used 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, characterized in that: The first overcurrent detection subunit includes: a first comparator and a reference voltage source; the non-inverting input end of the first comparator is connected to the drain of the first power tube, the inverting input end 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.

5. The solenoid valve driving chip according to claim 1, characterized in that: The second driving unit includes: a second driving sub-unit and a second power tube, the input end of the second driving sub-unit is connected to the control module, the output end of the second driving sub-unit is connected to the gate of the second power tube, the drain of the second power tube is connected to the corresponding solenoid valve, and the source of the second power tube is connected to the ground end.

6. The solenoid valve driving chip according to claim 5, characterized in that: The second safety diagnosis unit includes: a short circuit detection subunit, a second overcurrent detection subunit and a voltage clamping subunit; The short circuit detection subunit is used to compare the drain voltage of the second power tube, the first reference voltage and the second reference voltage to implement 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 used to compare the drain voltage of the second power tube with the third reference voltage to perform overcurrent detection on the second power tube, and output a corresponding second overcurrent detection signal according to the detection result; The voltage clamping subunit is used 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 in that: The short circuit detection subunit comprises: a first operational amplifier, a second comparator and a third comparator; The output end of the first operational amplifier is connected to the drain of the second power tube and to its own inverting input end, and 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 disconnected; The inverting input terminal of the second comparator and the inverting input terminal of the third comparator are both connected to the inverting input terminal of the first operational amplifier, the non-inverting input terminal of the second comparator is connected to the first reference voltage, the non-inverting input terminal of the third comparator is connected to the second reference voltage, and the output terminal of the second comparator and the output terminal of the third comparator are both used as the output terminal of the short circuit detection subunit; 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, characterized in that: The short circuit detection subunit includes: 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 end of the first switch is connected to a power supply voltage, and a second end of the first switch is connected to a first end 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 in sequence, the positive electrode of the second current source is also connected to the drain of the second power tube, and the second end of the second resistor is connected to the ground; The non-inverting input terminal of the fourth comparator is connected to the second terminal of the first resistor, and the inverting input terminal of the fourth comparator is connected to the first reference voltage; the inverting input terminal of the fifth comparator is connected to the first terminal of the second resistor, and the non-inverting input terminal of the fifth comparator is connected to the second reference voltage; the output terminal of the fourth comparator and the output terminal of the fifth comparator are both used as the output terminal of the short circuit detection subunit; 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 driven by the high side, and the second switch is turned on when the corresponding solenoid valve is turned off and driven by the low side.

9. The solenoid valve driving chip according to claim 3 or 6, characterized in that: The second overcurrent detection subunit includes a third resistor, a third power tube, a fourth resistor and a sixth comparator; A first end of the third resistor is connected to the drain of the second power tube, and a second end of the third resistor is connected to the drain of the third power tube; 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 sub-unit, and the source of the third power tube is connected to the first end of the fourth resistor; The non-inverting input terminal of the sixth comparator is connected to the source of the third power tube, the inverting input terminal of the sixth comparator is connected to the third reference voltage, and the output terminal of the sixth comparator serves as the output terminal of the second over-current detection sub-unit; A second end of the fourth resistor is grounded; Wherein, 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 in that: The second overcurrent detection subunits each include: a fourth power tube, a third current source and a seventh comparator; The negative electrode of the third current source is connected to the 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 over-current detection sub-unit; 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 the 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 in that: The voltage clamping subunit includes: a Zener diode, a fifth resistor, a sixth resistor and a buffer; The cathode of the Zener diode is connected to the drain of the second power tube, and the anode 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 end of the buffer is connected to the second end of the fifth resistor, and the output end of the buffer serves as the output end of the voltage clamping subunit.

12. An electronic device, characterized in that: The electronic device comprises the solenoid valve driving chip according to any one of claims 1 to 11.

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