A power line break detection system and vehicle system

Abstract

The application provides a power supply disconnection detection system and a vehicle system. The power supply disconnection detection system comprises a sensor chip, a power supply end and a ground end electrically connected with the sensor chip, a power supply signal input end, a disconnection detection circuit and a controller. The power supply signal input end is used for electrically connecting with the power supply end. The disconnection detection circuit is electrically connected with the power supply signal input end and comprises a disconnection detection output end. The controller comprises a detection end. The detection end is electrically connected with the disconnection detection output end. The controller detects the electric signal output by the disconnection detection circuit through the detection end, and determines the on-off state of the sensor chip and the power supply end or the ground end according to the electric signal. The sensor comprises a power supply end, a ground end, a chip and the power supply disconnection detection system. In this way, by arranging the disconnection detection circuit in the sensor chip, the controller can detect the electric signal output by the disconnection detection circuit, and then identify whether the sensor chip is disconnected with the power supply end or the ground end, so that accidents can be avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of circuit, in particular to a power line break detection system and vehicle system. BACKGROUND

[0002] The sensor chip is often applied in the field of vehicle. When the sensor chip and the power supply end or the ground end fail, the sensor chip will be in abnormal power supply condition, thus causing the output signal of the sensor chip to be abnormal. Moreover, the controller cannot effectively identify that the output signal of the sensor chip is an abnormal signal, thus causing the whole vehicle system to work abnormally and easily causing serious traffic accidents. SUMMARY

[0003] The present application provides a power line break detection system and vehicle system which aims to effectively identify whether the output signal of the sensor chip is abnormal.

[0004] The present application provides a power line break detection system, which comprises:

[0005] a sensor chip, a power supply end and a ground end which are electrically connected with the sensor chip;

[0006] a power signal input end which is arranged in the sensor chip and is used for being electrically connected with the power supply end;

[0007] a line break detection circuit which is arranged in the sensor chip, is electrically connected with the power signal input end, and comprises a line break detection output end; and

[0008] a controller which comprises a detection end, the detection end is electrically connected with the line break detection output end, the controller detects the electric signal output by the line break detection circuit through the detection end, and determines the on-off state of the sensor chip and the power supply end or the ground end according to the electric signal.

[0009] Optionally, the electric signal comprises a first electric signal and a second electric signal; the line break detection circuit comprises:

[0010] a detection control circuit;

[0011] a power signal transmission circuit which comprises a first end, a second end and a third end, wherein the first end is electrically connected with the detection control circuit, the second end is electrically connected with the power signal input end, and the third end is electrically connected with the line break detection output end;

[0012] when the sensor chip and the power supply end and the ground end are in the on state, the detection control circuit makes the power signal transmission circuit conduct, thus making the line break detection output end output the first electric signal;

[0013] When the sensor chip is in the disconnected state with the power terminal or the ground terminal, the detection control circuit disconnects the power signal transmission circuit, so that the disconnected line detection output end outputs the second electric signal.

[0014] Optionally, the disconnected line detection circuit comprises a pull-up resistor, one end of the pull-up resistor is electrically connected between the third end of the power signal transmission circuit and the controller, and the other end is electrically connected with the power terminal;

[0015] When the sensor chip is in the disconnected state with the power terminal or the ground terminal, the detection control circuit disconnects the power signal transmission circuit, and pulls up the second electric signal transmitted to the disconnected line detection output end to a high-level signal through the pull-up resistor; or

[0016] The disconnected line detection circuit comprises a pull-down resistor, one end of the pull-down resistor is electrically connected between the third end of the power signal transmission circuit and the controller, and the other end is electrically connected with the ground terminal;

[0017] When the sensor chip is in the disconnected state with the power terminal or the ground terminal, the detection control circuit disconnects the power signal transmission circuit, and pulls down the second electric signal transmitted to the disconnected line detection output end to a low-level signal through the pull-down resistor.

[0018] Optionally, the detection control circuit comprises a first MOS tube and a second MOS tube; the power signal transmission circuit comprises a third MOS tube and a fourth MOS tube;

[0019] The source of the first MOS tube is electrically connected with the power terminal, and the gate of the first MOS tube is connected with the ground terminal; the drain of the second MOS tube is electrically connected with the drain of the first MOS tube, and the gate of the second MOS tube is electrically connected with the source of the second MOS tube; the source of the third MOS tube is electrically connected with the power signal input end, the gate of the third MOS tube is electrically connected between the drain of the first MOS tube and the drain of the second MOS tube; the drain of the fourth MOS tube is electrically connected with the drain of the third MOS tube, the gate of the fourth MOS tube is electrically connected with the source of the second MOS tube, and the source of the fourth MOS tube is electrically connected with the disconnected line detection output end;

[0020] When the sensor chip is in the conductive state with the power terminal and the ground terminal, the first MOS tube makes the third MOS tube conductive, and the second MOS tube makes the fourth MOS tube conductive, so that the disconnected line detection output end outputs the first electric signal;

[0021] When the sensor chip is disconnected from the power supply end, the first MOS tube turns off the third MOS tube, and the second MOS tube turns off the fourth MOS tube, so that the disconnection detection output end outputs the second electrical signal.

[0022] Optionally, the detection circuit further comprises a first resistor, one end of the first resistor being electrically connected between the drain of the first MOS tube and the gate of the third MOS tube, and the other end being electrically connected to the source of the third MOS tube.

[0023] When the sensor chip is disconnected from the ground end, the first resistor turns off the third MOS tube.

[0024] Optionally, the detection circuit further comprises a second resistor, one end of the second resistor being electrically connected between the source of the second MOS tube and the gate of the fourth MOS tube, and the other end being electrically connected to the source of the fourth MOS tube.

[0025] When the sensor chip is disconnected from the ground end, the second resistor turns off the fourth MOS tube.

[0026] Optionally, the first MOS tube, the second MOS tube, the third MOS tube and the fourth MOS tube are all high-voltage MOS tubes.

[0027] Optionally, the detection circuit further comprises a charge pump, the charge pump being electrically connected between the power supply end and the source of the first MOS tube.

[0028] Optionally, the power supply disconnection detection system further comprises a buffer, the buffer being arranged in the sensor chip and being electrically connected between the power supply end and the power supply signal input end.

[0029] The application further provides a vehicle system, which comprises the power supply disconnection detection system as described above.

[0030] The power supply disconnection detection system and the vehicle system provided by the application, wherein the power supply disconnection detection system comprises a sensor chip, a power supply end and a ground end electrically connected with the sensor chip, a power supply signal input end, a disconnection detection circuit and a controller. The power supply signal input end is used for electrically connecting with the power supply end. The disconnection detection circuit is electrically connected with the power supply signal input end and comprises a disconnection detection output end. The controller comprises a detection end. The detection end is electrically connected with the disconnection detection output end, and the controller detects the electric signal output by the disconnection detection circuit through the detection end, and determines the on-off state of the sensor chip and the power supply end or the ground end according to the electric signal. In this way, by arranging the disconnection detection circuit in the sensor chip, the controller can recognize whether the sensor chip and the power supply end or the ground end are disconnected by detecting the electric signal output by the disconnection detection circuit, so that the accident can be avoided. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 The circuit diagram of the sensor chip of the power supply disconnection detection system of the application and the power supply end and the ground end is shown.

[0032] Figure 2 For Figure 1 The output signal schematic diagram of the sensor chip of the power supply disconnection detection system of the application is shown.

[0033] Figure 3 The circuit diagram of the sensor chip of the power supply disconnection detection system of the application and the power supply end is shown.

[0034] Figure 4 The circuit diagram of the sensor chip of the power supply disconnection detection system of the application and the ground end is shown.

[0035] Figure 5 For Figure 3 Or Figure 4 The output signal schematic diagram of the sensor chip of the power supply disconnection detection system of the application is shown.

[0036] Figure 6 The circuit block diagram of the power supply disconnection detection system of the application is shown.

[0037] Figure 7 For Figure 6 The voltage signal schematic diagram of the disconnection detection output end detected by the controller when the sensor chip of the power supply disconnection detection system of the application is powered off is shown.

[0038] Figure 8 Another circuit block diagram of the power supply disconnection detection system of the application is shown.

[0039] Figure 9 For Figure 8The schematic diagram of the voltage signal at the broken line detection output end detected by the controller when the sensor chip of the power supply broken line detection system of the present application is powered off.

[0040] Figure 10 For Figure 6 The circuit diagram of one embodiment of the power supply broken line detection system of the sensor of the present application.

[0041] Figure 11 For Figure 8 The circuit diagram of one embodiment of the power supply broken line detection system of the sensor of the present application. DETAILED DESCRIPTION

[0042] The exemplary embodiments will be described in detail herein with reference to the attached drawings. In the following description, like reference numerals refer to like elements, unless the context clearly dictates otherwise. The following description is not intended to represent all embodiments in accordance with the present application. Rather, they merely represent typical embodiments in accordance with a portion of the application, as detailed in the appended claims.

[0043] The terminology used in the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. Unless otherwise defined, technical terms or scientific terms used in the present application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The use of the terms "first", "second" and like terms in the present application are not intended to denote any order or importance, but are merely used to distinguish one element from another. Similarly, the use of the terms "a" or "an" are not intended to denote a quantity of one, but are merely used to denote at least one. If only one is intended, this will be explicitly stated. The use of the terms "plurality" or "a plurality" refers to two or more. The use of the terms "front", "back", "up", "down", and the like in the present application are used for ease of description and are not intended to limit the position or spatial orientation of the apparatus. The use of the terms "include", "includes", "including", and the like in the present application are meant to be non-limited to the elements or objects following the term. The use of the terms "connect", "connected", "connection", and the like in the present application are not restricted to direct or physical connections, but can include an electrical connection, whether direct or indirect. The use of the terms "a" and "an" and "the" and "said" in the present application are intended to include the plural, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises", "comprising", "includes" and "including", when used in this specification, specify the presence of stated elements or objects, but do not preclude the presence or addition of one or more other elements or objects. It will be further understood that the use of the terms "and / or", includes a combination of one or more of the associated listed items.

[0044] The power supply disconnection detection system provided by the application comprises a sensor chip, a power supply end and a ground end electrically connected with the sensor chip, a power supply signal input end, a disconnection detection circuit and a controller. The power supply signal input end is used to be electrically connected with the power supply end. The disconnection detection circuit is electrically connected with the power supply signal input end and comprises a disconnection detection output end. The controller comprises a detection end. The detection end is electrically connected with the disconnection detection output end. The controller detects the electric signal output by the disconnection detection circuit through the detection end and determines the on-off state of the sensor chip and the power supply end or the ground end according to the electric signal. In this way, by arranging the disconnection detection circuit in the sensor chip, the controller can recognize whether the sensor chip and the power supply end or the ground end are disconnected by detecting the electric signal output by the disconnection detection circuit, so that accidents can be avoided.

[0045] The application also provides a vehicle system comprising the power supply disconnection detection system.

[0046] Figure 1 Fig. 1 shows a circuit diagram of the sensor chip 2 of the power supply disconnection detection system 1 provided by the application and the power supply end VDD and the ground end GND. Figure 2 Fig. 2 shows an output signal diagram of the sensor chip 2 of the power supply disconnection detection system 1 provided by the application. Figure 1 Fig. 3 shows an output signal diagram of the sensor chip 2 of the power supply disconnection detection system 1 provided by the application.

[0047] Fig. 4 shows a circuit diagram of the sensor chip 2 of the power supply disconnection detection system 1 provided by the application and the power supply end VDD. Figure 1 Fig. 5 shows a circuit diagram of the sensor chip 2 of the power supply disconnection detection system 1 provided by the application and the ground end GND. Figure 2 Fig. 6 shows a circuit diagram of the sensor chip 2 of the power supply disconnection detection system 1 provided by the application and the power supply end VDD. Figure 1 Fig. 7 shows a circuit diagram of the sensor chip 2 of the power supply disconnection detection system 1 provided by the application and the ground end GND. Figure 2 Fig. 8 shows an output signal diagram of the sensor chip 2 of the power supply disconnection detection system 1 provided by the application. Figure 2 Fig. 9 shows an output signal diagram of the sensor chip 2 of the power supply disconnection detection system 1 provided by the application.

[0048] Figure 3 Fig. 10 shows a circuit diagram of the sensor chip 2 of the power supply disconnection detection system 1 provided by the application and the power supply end VDD. Figure 4 Fig. 11 shows a circuit diagram of the sensor chip 2 of the power supply disconnection detection system 1 provided by the application and the ground end GND. Figure 5 Fig. 12 shows an output signal diagram of the sensor chip 2 of the power supply disconnection detection system 1 provided by the application. Figure 3 Fig. 13 shows an output signal diagram of the sensor chip 2 of the power supply disconnection detection system 1 provided by the application. Figure 4 Fig. 14 shows an output signal diagram of the sensor chip 2 of the power supply disconnection detection system 1 provided by the application.

[0049] Fig. 15 shows a circuit diagram of the sensor chip 2 of the power supply disconnection detection system 1 provided by the application and the power supply end VDD. Figures 3-5As shown, when the power pin 3 of the sensor chip 2 is disconnected from the power terminal VDD (as shown in Figure 3 ), or the ground pin 4 of the sensor chip 2 is disconnected from the ground terminal GND (as shown in Figure 4 ), the sensor chip 2 cannot work normally, and outputs an abnormal signal (as shown in Figure 5 , Figure 5 The curve S2 in Figure 3 or Figure 4 represents the voltage output by the output terminal Vout of the sensor chip 2. However, in the related art, the system cannot detect whether the sensor chip 2 is disconnected from the power terminal VDD or the ground terminal GND, that is, whether the signal output by the sensor chip 2 is an abnormal signal. Especially in the field of sensor chips for vehicles with high safety requirements, if the sensor chip 2 is in a disconnected state from the power terminal VDD or the ground terminal GND, the vehicle system will cause serious traffic accidents due to the inability to identify that the sensor chip 2 outputs an abnormal signal.

[0050] Therefore, the present application provides a power disconnection detection system 1, as shown in Figure 6 . Figure 6A circuit block diagram of the power supply disconnection detection system 1 provided by the present application is shown. The power supply disconnection detection system 1 further comprises a power supply signal input end 6, a disconnection detection circuit 7 and a controller 8. The power supply signal input end 6 is arranged in the sensor chip 2 and is electrically connected with the power supply end VDD. The disconnection detection circuit 7 is arranged in the sensor chip 2 and is electrically connected with the power supply signal input end 6, and comprises a disconnection detection output end 9. The controller 8 comprises a detection end 10. The detection end 10 is electrically connected with the disconnection detection output end 9 and is used for detecting the electrical signal output by the disconnection detection circuit 7. Further, the controller 8 detects the electrical signal output by the disconnection detection circuit 7 through the detection end 10, and determines the on-off state of the power supply pin 3 of the sensor chip 2 and the power supply end VDD, or the on-off state of the ground pin 4 of the sensor chip 2 and the ground end GND according to the electrical signal. In this embodiment, by arranging the disconnection detection circuit 7 in the sensor chip 2, the controller 8 judges whether the sensor chip 2 is connected with the power supply end VDD or the ground end GND by detecting the electrical signal output by the disconnection detection circuit 7. The electrical signal comprises a first electrical signal and a second electrical signal. The first electrical signal refers to the electrical signal output by the disconnection detection output end 9 between the voltage of the power supply end VDD and the voltage of the ground end GND, but it is not very close to the voltage of the power supply end VDD and the voltage of the ground end GND, which is a normal signal. The second electrical signal refers to the electrical signal output by the disconnection detection output end 9 which is the voltage of the power supply end VDD or the voltage of the ground end GND, which is an abnormal signal. When the detection end 10 detects that the disconnection detection output end 9 outputs the electrical signal between the voltage of the power supply end VDD and the voltage of the ground end GND, it indicates that the power supply pin 3 of the sensor chip 2 is normally connected with the power supply end VDD, and the ground pin 4 is normally connected with the ground end GND, at this time the controller 8 can confirm that the signal output by the sensor chip 2 is a normal signal. When the detection end 10 detects that the disconnection detection output end 9 outputs the electrical signal which is the voltage of the power supply end VDD or the voltage of the ground end GND, it indicates that the power supply pin 3 of the sensor chip 2 is disconnected with the power supply end VDD or the ground pin 4 of the sensor chip 2 is disconnected with the ground end GND, at this time the controller 8 can confirm that the signal output by the sensor chip 2 is an abnormal signal, and further the vehicle system executes a protection measure, which can avoid a safety failure.

[0051] In some embodiments, the disconnection detection circuit 7 comprises a control detection circuit 11 and a power supply signal transmission circuit 12. The power supply signal transmission circuit 12 comprises a first end 13, a second end 14 and a third end 15, wherein the first end 13 is electrically connected to the control detection circuit 11, the second end 14 is electrically connected to the power supply signal input end 6, and the third end 15 is electrically connected to the disconnection detection output end 9. When the sensor chip 2 is in a conductive state with the power supply end VDD and the ground end GND, the control detection circuit 11 is turned on, and the power supply signal transmission circuit 12 is turned on, so that the disconnection detection output end 9 outputs a first electrical signal. At this time, the controller 8 confirms through the detection end 10 that the power supply pin 3 of the sensor chip 2 is normally electrically connected to the power supply end VDD, and the ground pin 4 is normally electrically connected to the ground end GND. When the sensor chip 2 is in a disconnected state with the power supply end VDD or the ground end GND, the control detection circuit 11 is turned off, and the power supply signal transmission circuit 12 is turned off, so that the disconnection detection output end 9 outputs a second electrical signal. At this time, the controller 8 confirms through the detection end 10 that the power supply pin 3 of the sensor chip 2 is disconnected from the power supply end VDD or the ground pin 4 is disconnected from the ground end GND, so that the controller 8 can identify the signal output by the sensor chip 2 as an abnormal signal, and the vehicle system can execute a protection measure to avoid a safety failure.

[0052] Figure 7 For Figure 6 When the sensor chip 2 of the power disconnection detection system 1 provided by the present application is powered off, the voltage signal at the disconnection detection output end 9 detected by the controller 8 is shown in the schematic diagram. In combination with Figure 6 , Figure 7 In some embodiments, the disconnection detection circuit 7 comprises a pull-up resistor Rpu, one end of the pull-up resistor Rpu is electrically connected between the third end 15 of the power supply signal transmission circuit 12 and the controller 8, and the other end is electrically connected to the power supply end VDD. When the sensor chip 2 is in a disconnected state with the power supply end VDD or the ground end GND, the control detection circuit 11 turns off the power supply signal transmission circuit 12, and the second electrical signal transmitted to the disconnection detection output end 9 is pulled up to a high level signal through the pull-up resistor Rpu. In this embodiment, when the power supply pin 3 of the sensor chip 2 is disconnected from the power supply end VDD, at this time the control detection circuit 11 and the power supply signal transmission circuit 12 are in a state of no power supply, and the pull-up resistor Rpu pulls the voltage transmitted to the disconnection detection output end 9 to the level of the power supply end VDD (as shown in Figure 7 Figure 7 ​The middle straight line S3 is the voltage outputted by the broken line detection output end 9 at this time. Further, the detection end 10 of the controller 8 can detect that the voltage at the broken line detection output end 9 is the power supply end VDD voltage, and the controller 8 can further identify that the electrical signal outputted by the sensor chip 2 is an abnormal signal. When the ground pin 4 of the sensor chip 2 is disconnected from the ground end GND, the entire sensor chip 2 is in a ground line suspended state at this time, and the detection control circuit 11 makes the power supply signal transmission circuit 12 in a disconnected state, so that the pull-up resistor Rpu can pull up the voltage transmitted to the broken line detection output end 9 to the level of the power supply end VDD. Similarly, the detection end 10 of the controller 8 can detect that the voltage at the broken line detection output end 9 is the power supply end VDD voltage, and the controller 8 can further identify that the signal outputted by the sensor chip 2 is an abnormal signal. In this way, the vehicle system can perform protective measures in advance to avoid safety failures.

[0053] Figure 8 Another circuit block diagram of the power supply broken line detection system 1 of the present application is shown. Figure 9 For Figure 8 The voltage signal diagram detected by the controller 8 at the broken line detection output end 9 of the power supply broken line detection system 1 provided by the present application when the sensor chip 2 is powered off is shown. In combination with Figure 8 、 Figure 9 As shown, the broken line detection circuit 7 includes a pull-down resistor Rpd, one end of the pull-down resistor Rpd is electrically connected between the third end 15 of the power supply signal transmission circuit 12 and the controller 8, and the other end is electrically connected with the ground end GND. When the sensor chip 2 is in a disconnected state with the power supply end VDD or the ground end GND, the detection control circuit 11 makes the power supply signal transmission circuit 12 disconnected, and the second electrical signal transmitted to the broken line detection output end 9 is pulled down to a low level signal through the pull-down resistor Rpd. In this embodiment, when the power supply pin 3 of the sensor chip 2 is disconnected from the power supply end VDD, the detection control circuit 11 and the power supply signal transmission circuit 12 are both in a power-off state at this time, and the pull-down resistor Rpd pulls down the voltage transmitted to the broken line detection output end 9 to the level of the ground end GND (as shown in Figure 9 Figure 9 ​The voltage outputted by the broken line detection output end 9 at this time is the middle straight line S4. Further, the detection end 10 of the controller 8 can detect that the voltage at the broken line detection output end 9 is the voltage of the ground end GND, and further the controller 8 can identify that the signal outputted by the sensor chip 2 is an abnormal signal. When the ground pin 4 of the sensor chip 2 is disconnected from the ground end GND, at this time the entire sensor chip 2 will be in a ground line suspended state, and the detection control circuit 11 is disconnected, also making the power supply signal transmission circuit 12 in a disconnected state, so that the voltage transmitted to the broken line detection output end 9 can be pulled down to the ground end GND level by the pull-down resistor Rpd. Similarly, the detection end 10 of the controller 8 can detect that the voltage at the broken line detection output end 9 is the voltage of the ground end GND, and further the controller 8 can identify that the signal outputted by the sensor chip 2 is an abnormal signal. In this way, the vehicle system can perform protective measures in advance to avoid safety failures.

[0054] Figure 10 For Figure 6 The circuit diagram of one embodiment of the power supply broken line detection system 1 of the present application is shown. As Figure 10As shown, the detection circuit 11 comprises a first MOS tube P1 and a second MOS tube P2. The first MOS tube P1 and the second MOS tube P2 are both P-type MOS tubes. The power supply signal transmission circuit 12 comprises a third MOS tube N1 and a fourth MOS tube N2. The third MOS tube N1 and the fourth MOS tube N2 are both N-type MOS tubes. The source of the first MOS tube P1 is electrically connected to the power supply end VDD, and the gate of the first MOS tube P1 is connected to the ground end GND. The drain of the second MOS tube P2 is electrically connected to the drain of the first MOS tube P1, and the gate of the second MOS tube P2 is electrically connected to the source of the second MOS tube P2. The source of the third MOS tube N1 is electrically connected to the power supply signal input end 6, and the gate of the third MOS tube N1 is electrically connected between the drain of the first MOS tube P1 and the drain of the second MOS tube P2. The drain of the fourth MOS tube N2 is electrically connected to the drain of the third MOS tube N1, the gate of the fourth MOS tube N2 is electrically connected to the source of the second MOS tube P2, and the source of the fourth MOS tube N2 is electrically connected to the disconnection detection output end 9. When the sensor chip 2 and the power supply end VDD and the ground end GND are in a conductive state, the first MOS tube P1 is turned on, and the current flowing through the first MOS tube P1 is transmitted to the gate of the third MOS tube N1, so that the third MOS tube N1 is turned on, and is transmitted to the gate of the fourth MOS tube N2 through the second MOS tube P2, so that the fourth MOS tube N2 is turned on, so that the disconnection detection output end 9 outputs a first electric signal, indicating that the signal output by the sensor chip 2 is a normal signal. When the sensor chip 2 and the power supply end VDD are in a disconnected state, the first MOS tube P1 is in an off state, and the third MOS tube N1 is turned off, and the second MOS tube P2 is also in an off state, and the fourth MOS tube N2 is turned off. At this time, the voltage transmitted to the disconnection detection output end 9 can be pulled up to the level of the power supply end VDD through the pull-up resistor Rpu, so that the disconnection detection output end 9 outputs a second electric signal, indicating that the signal output by the sensor chip 2 is an abnormal signal.

[0055] In some embodiments, the first MOS tube P1, the second MOS tube P2, the third MOS tube N1 and the fourth MOS tube N2 are all high-voltage MOS tubes, which are conducive to allowing a larger voltage to pass through.

[0056] In some embodiments, the detection and control circuit 11 further comprises a first resistor R1, one end of the first resistor R1 is electrically connected between the drain of the first MOS tube P1 and the gate of the third MOS tube N1, and the other end is electrically connected to the source of the third MOS tube N1. When the sensor chip 2 is disconnected from the ground GND, the first resistor R1 causes the third MOS tube N1 to be turned off. In this embodiment, the disconnection detection output end 9 is electrically connected to the pull-up resistor Rpu, and when the sensor chip 2 is disconnected from the ground GND, the first MOS tube P1 is turned off at this time, but due to the existence of the pull-up resistor Rpu, there is a voltage between the drain of the first MOS tube P1 and the drain of the second MOS tube P2 in the circuit, which may cause the third MOS tube N1 to be turned on. Therefore, by short-circuiting the first resistor R1 between the gate and the source of the third MOS tube N1, the third MOS tube N1 is turned off, and the entire power supply signal transmission circuit 12 is in a no-power state, so that the pull-up resistor Rpu pulls the voltage signal transmitted to the disconnection detection output end 9 to a high level signal, and the detection end 10 of the controller 8 can detect that the voltage at the disconnection detection output end 9 is the power supply end VDD voltage, and the controller 8 can further identify that the signal output by the sensor chip 2 is an abnormal signal.

[0057] Figure 11 For Figure 8 the circuit diagram of an embodiment of the power supply disconnection detection system 1 of the present application is shown. As Figure 11 In some embodiments, the detection and control circuit 11 further comprises a second resistor R2, one end of the second resistor R2 is electrically connected between the source of the second MOS tube P2 and the gate of the fourth MOS tube N2, and the other end is electrically connected to the source of the fourth MOS tube N2. When the sensor chip 2 is disconnected from the ground GND, the second resistor R2 causes the fourth MOS tube N2 to be turned off. In this embodiment, the disconnection detection output end 9 is electrically connected to the pull-down resistor Rpd, and when the sensor chip 2 is disconnected from the ground GND, the first MOS tube P1 is turned off at this time, but due to the existence of the pull-down resistor Rpd, there is a voltage between the source of the second MOS tube P2 and the source of the fourth MOS tube N2 in the circuit, which may cause the fourth MOS tube N2 to be turned on. Therefore, by short-circuiting the second resistor R2 between the gate and the source of the fourth MOS tube N2, the fourth MOS tube N2 is turned off, and the disconnection detection output end 9 is in a no-power state, so that the pull-down resistor Rpd pulls the signal transmitted to the disconnection detection output end 9 to a low level signal, and the detection end 10 of the controller 8 can detect that the voltage at the disconnection detection output end 9 is the ground GND voltage, and the controller 8 can further identify that the signal output by the sensor chip 2 is an abnormal signal.

[0058] In some embodiments, the prosecution circuit 11 further comprises a charge pump 16 electrically connected between the power supply end VDD and the source of the first MOS transistor P1. The charge pump 16 is used to raise the voltage of the power supply end VDD, so that the voltage input to the first MOS transistor P1 is higher than the voltage of the power supply end VDD by 3V. For example, the voltage of the power supply end VDD can be 5V, so that after the voltage is raised by the charge pump 16, the voltage input to the source of the first MOS transistor P1 is 8V, and the on voltage of the first MOS transistor P1 is 7V, so that the first MOS transistor P1 is favorably turned on.

[0059] As shown in FIG. 1, Figure 6 Figure 8 As shown in FIG. 1,

[0060] The above description is only one specific example of the present application, and does not constitute any limitation on the present application. Obviously, for those skilled in the art, after understanding the content and principles of the present application, various modifications and changes in form and details can be made without departing from the principles and structures of the present application, but these modifications and changes based on the idea of the present application are still within the protection scope of the claims of the present application.​

Claims

1. A power line interruption detection system, characterized by, The application relates to a sensor chip and a power supply end and a ground end electrically connected with the sensor chip. A power supply signal input end is arranged in the sensor chip and is electrically connected with the power supply end. A disconnection detection circuit is arranged in the sensor chip, is electrically connected with the power supply signal input end and comprises a disconnection detection output end. A controller comprises a detection end electrically connected with the disconnection detection output end, detects an electric signal output by the disconnection detection circuit through the detection end and determines the on-off state of the sensor chip and the power supply end or the ground end according to the electric signal. The electric signal comprises a first electric signal and a second electric signal. The disconnection detection circuit comprises a detection control circuit, a power supply signal transmission circuit comprising a first end, a second end and a third end, wherein the first end is electrically connected with the detection control circuit, the second end is electrically connected with the power supply signal input end and the third end is electrically connected with the disconnection detection output end. When the sensor chip and the power supply end and the ground end are in the on state, the detection control circuit makes the power supply signal transmission circuit on, so that the disconnection detection output end outputs the first electric signal. When the sensor chip and the power supply end or the ground end are in the off state, the detection control circuit makes the power supply signal transmission circuit off, so that the disconnection detection output end outputs the second electric signal. The detection control circuit comprises a first MOS tube and a second MOS tube; the power supply signal transmission circuit comprises a third MOS tube and a fourth MOS tube. The source of the first MOS tube is electrically connected with the power supply end, the gate of the first MOS tube is connected with the ground end; the drain of the second MOS tube is electrically connected with the drain of the first MOS tube, the gate of the second MOS tube is electrically connected with the source of the second MOS tube; the source of the third MOS tube is electrically connected with the power supply signal input end, the gate of the third MOS tube is electrically connected between the drain of the first MOS tube and the drain of the second MOS tube; the drain of the fourth MOS tube is electrically connected with the drain of the third MOS tube, the gate of the fourth MOS tube is electrically connected with the source of the second MOS tube and the source of the fourth MOS tube is electrically connected with the disconnection detection output end. When the sensor chip and the power supply end and the ground end are in the on state, the first MOS tube makes the third MOS tube on and the second MOS tube makes the fourth MOS tube on, so that the disconnection detection output end outputs the first electric signal. When the sensor chip and the power supply end are in the off state, the first MOS tube makes the third MOS tube off and the second MOS tube makes the fourth MOS tube off, so that the disconnection detection output end outputs the second electric signal. The disconnection detection circuit comprises a pull-up resistor, one end of the pull-up resistor is electrically connected between the third end of the power supply signal transmission circuit and the controller and the other end is electrically connected with the power supply end. ​ ​ 2. The power supply line break detection system of claim 1, wherein ​ When the sensor chip is disconnected from the power supply end or the ground end, the detection and control circuit disconnects the power supply signal transmission circuit and pulls up the second electric signal transmitted to the disconnection detection output end to a high-level signal through the pull-up resistor; or The disconnection detection circuit comprises a pull-down resistor, one end of the pull-down resistor being electrically connected between the third end of the power supply signal transmission circuit and the controller, and the other end being electrically connected to the ground end; When the sensor chip is disconnected from the power supply end or the ground end, the detection and control circuit disconnects the power supply signal transmission circuit and pulls down the second electric signal transmitted to the disconnection detection output end to a low-level signal through the pull-down resistor.

3. The power supply line break detection system of claim 1, wherein, The detection and control circuit further comprises a first resistor, one end of the first resistor being electrically connected between the drain of the first MOS tube and the gate of the third MOS tube, and the other end being electrically connected to the source of the third MOS tube; When the sensor chip is disconnected from the ground end, the first resistor turns off the third MOS tube.

4. The power supply line break detection system of claim 1, wherein, The detection and control circuit further comprises a second resistor, one end of the second resistor being electrically connected between the source of the second MOS tube and the gate of the fourth MOS tube, and the other end being electrically connected to the source of the fourth MOS tube; When the sensor chip is disconnected from the ground end, the second resistor turns off the fourth MOS tube.

5. The power supply line break detection system of claim 1, wherein, The first MOS tube, the second MOS tube, the third MOS tube and the fourth MOS tube are all high-voltage MOS tubes.

6. The power supply line break detection system of claim 1, wherein, The detection and control circuit further comprises a charge pump, the charge pump being electrically connected between the power supply end and the source of the first MOS tube.

7. The power supply line break detection system of claim 1, wherein, The power supply disconnection detection system further comprises a buffer, the buffer being arranged in the sensor chip and being electrically connected between the power supply end and the power supply signal input end.

8. A vehicle system characterized by, The power supply disconnection detection system comprises any one of the power supply disconnection detection systems according to claims 1 to 7.

Images