CN115629337A - Power supply broken line detection system and vehicle system - Google Patents

Power supply broken line detection system and vehicle system Download PDF

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Publication number
CN115629337A
CN115629337A CN202211410154.9A CN202211410154A CN115629337A CN 115629337 A CN115629337 A CN 115629337A CN 202211410154 A CN202211410154 A CN 202211410154A CN 115629337 A CN115629337 A CN 115629337A
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CN
China
Prior art keywords
power supply
electrically connected
sensor chip
detection
mos tube
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CN202211410154.9A
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Chinese (zh)
Inventor
张超
彭思达
杨莹
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Saizhuo Electronic Technology Shanghai Co ltd
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Saizhuo Electronic Technology Shanghai Co ltd
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Priority to CN202211410154.9A priority Critical patent/CN115629337A/en
Priority to PCT/CN2022/143271 priority patent/WO2024098537A1/en
Publication of CN115629337A publication Critical patent/CN115629337A/en
Pending legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/54—Testing for continuity
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/58—Testing of lines, cables or conductors

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Abstract

The application provides a power supply broken line detection system and a vehicle system. The power supply disconnection detection system comprises a sensor chip, a power supply end, a ground end, a power supply signal input end, a disconnection detection circuit and a controller, wherein the power supply end and the ground end are electrically connected with the sensor chip. The power supply signal input end is used for being electrically connected with a 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 includes a detection terminal. 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 the on-off state of the sensor chip and the power supply end or the ground end is determined according to the electric signal. The sensor comprises a power supply end, a ground end, a chip and a power supply disconnection detection system. So, through set up broken string detection circuitry in sensor chip for the controller is through detecting the signal of telecommunication of broken string detection circuitry output, and then can discern whether sensor chip and power end or ground end break off, thereby can avoid the emergence accident.

Description

Power supply broken line detection system and vehicle system
Technical Field
The invention relates to the technical field of circuits, in particular to a power supply disconnection detection system and a vehicle system.
Background
The sensor chip is often used in the vehicle field, and when the sensor chip breaks down with a power supply end or a ground end, the sensor chip is caused to generate a power supply abnormal condition, so that the output signal of the sensor chip is abnormal. In addition, the controller cannot effectively identify that the output signal of the sensor chip is an abnormal signal, so that the whole vehicle system works abnormally, and serious traffic accidents are easily caused.
Disclosure of Invention
The present application provides a power supply disconnection detection system and a vehicle system that aim at effectively identifying whether an output signal of a sensor chip is abnormal.
The application provides a power supply broken string detecting system, wherein, include:
the device comprises a sensor chip, and a power supply end and a ground end which are electrically connected with the sensor chip;
the power supply signal input end is arranged in the sensor chip and is used for being electrically connected with the power supply end;
the broken line detection circuit is arranged in the sensor chip, is electrically connected with the power supply signal input end and comprises a broken line detection output end; and
and 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 the on-off state of the sensor chip and the power end or the ground end is determined according to the electric signal.
Optionally, the electrical signal comprises a first electrical signal and a second electrical signal; the disconnection detecting circuit includes:
a detection and control circuit;
the power supply signal transmission circuit comprises a first end, a second end and a third end, wherein the first end is electrically connected with the detection and 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 is in a conducting state with the power supply end and the ground end, the detection and control circuit conducts the power supply signal transmission circuit, so that the broken line detection output end outputs the first electric signal;
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, so that the broken line detection output end outputs the second electric signal.
Optionally, the disconnection detecting circuit includes 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 of the pull-up resistor is electrically connected to the power supply terminal;
when the sensor chip is disconnected with the power supply end or the ground end, the detection and control circuit enables the power supply signal transmission circuit to be disconnected, and the second electric signal transmitted to the disconnection detection output end is pulled up 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 is electrically connected between the third end of the power supply signal transmission circuit and the controller, and the other end of the pull-down resistor is electrically connected with the ground end;
when the sensor chip is disconnected from the power supply end or the ground end, the detection and control circuit enables the power supply signal transmission circuit to be disconnected, and the second electric signal transmitted to the broken line detection output end is pulled down to a low level signal through the pull-down resistor.
Optionally, the detection and control circuit includes a first MOS transistor and a second MOS transistor; the power supply signal transmission circuit comprises a third MOS tube and a fourth MOS tube;
the source electrode of the first MOS tube is electrically connected with the power supply end, and the grid electrode of the first MOS tube is connected with the ground end; the drain electrode of the second MOS tube is electrically connected with the drain electrode of the first MOS tube, and the grid electrode of the second MOS tube is electrically connected with the source electrode of the second MOS tube; the source electrode of the third MOS tube is electrically connected with the power supply signal input end, and the grid electrode of the third MOS tube is electrically connected between the drain electrode of the first MOS tube and the drain electrode of the second MOS tube; the drain electrode of the fourth MOS tube is electrically connected with the drain electrode of the third MOS tube, the grid electrode of the fourth MOS tube is electrically connected with the source electrode of the second MOS tube, and the source electrode of the fourth MOS tube is electrically connected with the disconnection detection output end;
when the sensor chip is in a conducting state with the power supply end and the ground end, the first MOS tube enables the third MOS tube to be conducted, and the second MOS tube enables the fourth MOS tube to be conducted, so that the broken line detection output end outputs the first electric signal;
when the sensor chip and the power supply end are in a disconnected state, the first MOS tube enables the third MOS tube to be turned off, and the second MOS tube enables the fourth MOS tube to be turned off, so that the second electric signal is output by the broken line detection output end.
Optionally, the detection and control circuit further includes a first resistor, one end of the first resistor is electrically connected between the drain of the first MOS transistor and the gate of the third MOS transistor, and the other end of the first resistor is electrically connected to the source of the third MOS transistor;
when the sensor chip and the ground end are in a disconnected state, the first resistor enables the third MOS tube to be turned off.
Optionally, the detection and control circuit further includes a second resistor, one end of the second resistor is electrically connected between the source of the second MOS transistor and the gate of the fourth MOS transistor, and the other end of the second resistor is electrically connected to the source of the fourth MOS transistor;
when the sensor chip and the ground end are in a disconnected state, the second resistor enables the fourth MOS tube to be turned off.
Optionally, the first MOS transistor, the second MOS transistor, the third MOS transistor, and the fourth MOS transistor are high-voltage MOS transistors.
Optionally, the detection and control circuit further includes a charge pump, and the charge pump is electrically connected between the power supply terminal and the source electrode of the first MOS transistor.
Optionally, the power supply disconnection detection system further includes a buffer, and the buffer is disposed in the sensor chip and electrically connected between the power supply end and the power supply signal input end.
The application further provides a vehicle system, wherein the power supply disconnection detection system comprises the power supply disconnection detection system.
The application provides a power supply broken string detecting system and vehicle system, wherein power supply broken string detecting system includes sensor chip and power end and the ground terminal, power supply signal input end, broken string detection circuitry and controller that are connected with sensor chip electricity. The power supply signal input end is used for being electrically connected with a 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 includes a detection terminal. 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 the on-off state of the chip of the sensor and the power end or the ground end is determined according to the electric signal. So, through set up broken string detection circuitry in sensor chip for the controller is through detecting the signal of telecommunication of broken string detection circuitry output, and then can discern whether the chip of sensor breaks off with power end or ground, thereby can avoid the emergence accident.
Drawings
Fig. 1 is a circuit diagram illustrating a sensor chip of the power supply disconnection detecting system according to the present invention, which is electrically connected to a power source terminal and a ground terminal.
Fig. 2 is a schematic diagram of an output signal of a sensor chip of the power supply disconnection detection system of the present application shown in fig. 1.
Fig. 3 is a circuit diagram showing the disconnection of the sensor chip from the power source terminal of the power supply disconnection detecting system of the present application.
Fig. 4 is a circuit diagram showing the disconnection between the sensor chip and the ground terminal of the power supply disconnection detection system of the present application.
Fig. 5 is a schematic diagram of an output signal of the sensor chip of the power supply disconnection detecting system of the present application shown in fig. 3 or 4.
Fig. 6 is a circuit block diagram of the power supply disconnection detecting system of the present application.
Fig. 7 is a schematic diagram of a voltage signal at the disconnection detection output terminal detected by the controller when the sensor chip of the power supply disconnection first detection system shown in fig. 6 is powered off.
Fig. 8 is another circuit block diagram of the power supply disconnection detecting system of the present application.
Fig. 9 is a schematic diagram of a voltage signal at the disconnection detection output terminal detected by the controller when the sensor chip of the power supply disconnection detection system of the present application shown in fig. 8 is powered off.
Fig. 10 is a circuit diagram of one embodiment of the power outage detection system of the present application shown in fig. 6.
FIG. 11 is a circuit diagram of one embodiment of a power supply disconnection detection system of the sensor of the present application shown in FIG. 8.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus consistent with certain aspects of the present application, as detailed in the appended claims.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the description and in the claims does not indicate any order, quantity, or importance, but rather is used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. If only one is referred to, it will be described separately. "plurality" or "a number" means two or more. Unless otherwise indicated, "front", "rear", "lower" and/or "upper" and the like are for convenience of description and are not limited to one position or one spatial orientation. The word "comprising" or "comprises", and the like, means that the element or item listed after "comprises" or "comprising" is inclusive of the element or item listed after "comprising" or "comprises", and the equivalent thereof, and does not exclude additional elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. As used in this specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
The power supply disconnection detection system comprises a sensor chip, and a power supply end, a ground end, a power supply signal input end, a disconnection detection circuit and a controller which are electrically connected with the sensor chip. The power supply signal input end is used for being electrically connected with a 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 includes a detection terminal. 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 the on-off state of the chip of the sensor and the power supply end or the ground end is determined according to the electric signal. So, through set up broken string detection circuitry in sensor chip for the controller is through detecting the signal of telecommunication of broken string detection circuitry output, and then can discern whether the chip of sensor breaks off with power end or ground, thereby can avoid the emergence accident.
The present application further provides a vehicle system including a power supply disconnection detection system.
Fig. 1 is a circuit diagram illustrating a sensor chip 2 of a power supply disconnection detecting system 1 according to the present invention, which is electrically connected to a power supply terminal VDD and a ground terminal GND. Fig. 2 is a schematic diagram of an output signal of the sensor chip 2 of the power supply disconnection detecting system 1 shown in fig. 1.
Referring to fig. 1 and 2, the power supply disconnection detecting system 1 includes a power supply terminal VDD, a ground terminal GND, and a sensor chip 2. The sensor chip 2 includes a power pin 3 and a ground pin 4, wherein the power pin 3 is electrically connected to a power terminal VDD, and the ground pin 4 is electrically connected to a ground terminal GND. When the power pin 3 of the sensor chip 2 is normally connected to the power terminal VDD, and the ground pin 4 of the sensor chip 2 is normally connected to the ground terminal GND (as shown in fig. 1), the sensor chip 2 normally operates, and the output terminal Vout outputs a normal signal (as shown in fig. 2), wherein the slope S1 in fig. 2 represents the voltage output by the output terminal Vout.
Fig. 3 is a circuit diagram illustrating the disconnection between the sensor chip 2 and the power supply terminal VDD of the power supply disconnection detecting system 1 according to the present invention. Fig. 4 is a circuit diagram illustrating the disconnection between the sensor chip 2 and the ground GND in the power supply disconnection detection system 1 according to the present invention. Fig. 5 is a schematic diagram of an output signal of the sensor chip 2 of the power supply disconnection detecting system 1 provided in the present application shown in fig. 3 or 4.
Referring to fig. 3 to 5, when the power pin 3 of the sensor chip 2 is disconnected from the power terminal VDD (as shown in fig. 3), or the ground pin 4 of the sensor chip 2 is disconnected from the ground terminal GND (as shown in fig. 4), the sensor chip 2 cannot normally operate, and accordingly outputs an abnormal signal (as shown in fig. 5), and a curve S2 in fig. 5 represents a voltage output by the output terminal Vout of the sensor chip 2 in fig. 3 or 4. 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 from the sensor chip 2 is an abnormal signal. Particularly, in the field of sensor chips of vehicles with high safety requirements, if the sensor chip 2 is disconnected from the power supply terminal VDD or the ground terminal GND, a vehicle system may cause a serious traffic accident because it is impossible to recognize that an abnormal signal is output from the sensor chip 2.
Accordingly, the present application provides a power supply disconnection detection system 1, as shown in fig. 6. Fig. 6 is a circuit block diagram of the power supply disconnection detection system 1 provided in the present application. 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 terminal 6 is arranged in the sensor chip 2 and is used for being electrically connected with a power supply terminal VDD. The disconnection detection circuit 7 is arranged in the sensor chip 2, is electrically connected with the power supply signal input end 6, and comprises a disconnection detection output end 9. The controller 8 includes a detection terminal 10. The detection terminal 10 is electrically connected with the disconnection detection output terminal 9 and is used for detecting the electric signal output by the disconnection detection circuit 7. Further, the controller 8 detects the electric signal output from the disconnection detecting circuit 7 through the detecting terminal 10, and determines the on/off state of the power supply pin 3 and the power supply terminal VDD of the sensor chip 2 or the on/off state of the ground pin 4 and the ground terminal GND of the sensor chip 2 based on the electric signal. In this embodiment, the disconnection detecting circuit 7 is disposed in the sensor chip 2, so that the controller 8 determines whether the sensor chip 2 is conductive with the power source terminal VDD or the ground terminal GND by detecting an electric signal output from the disconnection detecting circuit 7. The electrical signals include a first electrical signal and a second electrical signal. The first electrical signal is an electrical signal outputted from the disconnection detection output terminal 9 between the voltage of the power terminal VDD and the voltage of the ground terminal GND, but is not very close to the voltage of the power terminal VDD and the voltage of the ground terminal GND, and is a normal signal. The second electrical signal is an electrical signal outputted from the disconnection detection output terminal 9 and indicating the voltage of the power supply terminal VDD or the voltage of the ground terminal GND, and is an abnormal signal. When the detection terminal 10 detects that the signal output by the disconnection detection output terminal 9 is an electrical signal between the voltage of the power terminal VDD and the voltage of the ground terminal GND, it indicates that the power pin 3 of the sensor chip 2 is normally connected to the power terminal VDD, and the ground pin 4 is normally connected to the ground terminal GND, and at this time, the controller 8 can determine that the signal output by the sensor chip 2 is a normal signal. When the detection end 10 detects that the signal output by the disconnection detection output end 9 is an electric signal of 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 from the power supply end VDD or the ground pin 4 of the sensor chip 2 is disconnected from the ground end GND, and at this time, the controller 8 can confirm that the signal output by the sensor chip 2 is an abnormal signal, so that the vehicle system executes protection measures, and safety faults can be avoided.
In some embodiments, the disconnection detecting circuit 7 includes a detection and control circuit 11 and a power supply signal transmission circuit 12. The power supply signal transmission circuit 12 includes a first end 13, a second end 14 and a third end 15, wherein the first end 13 is electrically connected to the detection and control 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 conducting state with the power supply end VDD and the ground end GND, the detection and control circuit 11 is conducted, and the power supply signal transmission circuit 12 is conducted, so that the disconnection detection output end 9 outputs a first electric signal, at this time, the controller 8 confirms that the power supply pin 3 of the sensor chip 2 is normally electrically connected with the power supply end VDD through the detection end 10, and the ground pin 4 is normally electrically connected with the ground end GND. When the sensor chip 2 and the power end VDD or the ground end GND are in a disconnected state, the detection and control circuit 11 is disconnected, and the power supply signal transmission circuit 12 is disconnected, so that the disconnection detection output end 9 outputs a second electric signal, at the moment, the controller 8 confirms that the power pin 3 of the sensor chip 2 is disconnected from the power end VDD or the ground pin 4 is disconnected from the ground end GND through the detection end 10, so that the controller 8 can identify that the signal output by the sensor chip 2 is an abnormal signal, and further, the vehicle system can perform protection measures, and safety faults can be avoided.
Fig. 7 is a schematic diagram of a voltage signal at the disconnection detection output terminal 9 detected by the controller 8 when the sensor chip 2 of the power supply disconnection first detection system 1 shown in fig. 6 is powered off. In some embodiments, as shown in fig. 6 and 7, the disconnection detecting circuit 7 includes a pull-up resistor Rpu, one end of the pull-up resistor Rpu is electrically connected between the third terminal 15 of the power supply signal transmitting circuit 12 and the controller 8, and the other end is electrically connected to the power supply terminal VDD. When the sensor chip 2 is disconnected from the power terminal VDD or the ground terminal GND, the detection and control circuit 11 disconnects the power supply signal transmission circuit 12, and pulls up the second electrical signal transmitted to the disconnection detection output terminal 9 to a high-level signal through the pull-up resistor Rpu. In this embodiment, when the power pin 3 of the sensor chip 2 is disconnected from the power terminal VDD, the detection and control circuit 11 and the power signal transmitting circuit 12 are both in a non-power-supplying state, the pull-up resistor Rpu pulls the voltage transmitted to the disconnection detection output terminal 9 up to the level of the power terminal VDD (as shown in fig. 7), and the straight line S3 in fig. 7 is the voltage output by the disconnection detection output terminal 9 at this time. Further, the detection terminal 10 of the controller 8 can detect that the voltage at the disconnection detection output terminal 9 is the power supply terminal VDD voltage, and further the controller 8 can identify that the electric signal output by the sensor chip 2 is an abnormal signal. When the ground pin 4 of the sensor chip 2 is disconnected from the ground terminal GND, the whole sensor chip 2 is in a ground wire suspension state, and the detection and control circuit 11 enables the power supply signal transmission circuit 12 to be in a disconnection state, so that the pull-up resistor Rpu can pull up the voltage transmitted to the disconnection detection output terminal 9 to the level of the power supply terminal VDD. Similarly, the detection terminal 10 of the controller 8 can detect that the voltage at the disconnection detection output terminal 9 is the power supply terminal VDD voltage, and further the controller 8 can identify that the signal output by the sensor chip 2 is an abnormal signal. Therefore, the vehicle system executes protective measures in advance, and safety faults can be avoided.
Fig. 8 is another circuit block diagram of the power supply disconnection detecting system 1 of the present application. Fig. 9 is a schematic diagram of a voltage signal at the disconnection detection output terminal 9 detected by the controller 8 when the sensor chip 2 of the power supply disconnection detection system 1 shown in fig. 8 is powered off. As shown in fig. 8 and 9, the disconnection detecting circuit 7 includes a pull-down resistor Rpd, one end of the pull-down resistor Rpd is electrically connected between the third terminal 15 of the power supply signal transmitting circuit 12 and the controller 8, and the other end of the pull-down resistor Rpd is electrically connected to the ground GND. When the sensor chip 2 and the power supply terminal VDD or the ground terminal GND are in a disconnected state, the detection and control circuit 11 disconnects the power supply signal transmission circuit 12, and pulls down the second electrical signal transmitted to the disconnection detection output terminal 9 to a low level signal through the pull-down resistor Rpd. In this embodiment, when the power pin 3 of the sensor chip 2 is disconnected from the power terminal VDD, the detection and control circuit 11 and the power signal transmission circuit 12 are both in a non-power-supply state, the pull-down resistor Rpd pulls down the voltage transmitted to the disconnection detection output terminal 9 to the level of the ground GND (as shown in fig. 9), and the straight line S4 in fig. 9 is the voltage output by the disconnection detection output terminal 9 at this time. Further, the detection terminal 10 of the controller 8 can detect that the voltage at the disconnection detection output terminal 9 is the voltage of the ground terminal GND, and further the controller 8 can recognize that the signal output by the sensor chip 2 is an abnormal signal. When the ground pin 4 of the sensor chip 2 is disconnected from the ground terminal GND, the whole sensor chip 2 is in a ground wire suspension state, the detection and control circuit 11 is disconnected, and the power supply signal transmission circuit 12 is also in a disconnection state, so that the pull-down resistor Rpd can pull down the voltage transmitted to the disconnection detection output terminal 9 to the level of the ground terminal GND. Similarly, the detection terminal 10 of the controller 8 can detect that the voltage at the disconnection detection output terminal 9 is the voltage of the ground GND, and further the controller 8 can identify that the signal output by the sensor chip 2 is an abnormal signal. Thus, the vehicle system can execute protective measures in advance to avoid safety failure.
Fig. 10 is a circuit diagram of one embodiment of the power supply disconnection detection system 1 of the present application shown in fig. 6. As shown in fig. 10, the detection and control circuit 11 includes a first MOS transistor P1 and a second MOS transistor 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 includes a third MOS transistor N1 and a fourth MOS transistor N2. The third MOS transistor N1 and the fourth MOS transistor N2 are both N-type MOS transistors. The source electrode of the first MOS tube P1 is electrically connected with a power supply end VDD, and the grid electrode of the first MOS tube P1 is connected with a ground end GND. The drain electrode of the second MOS transistor P2 is electrically connected to the drain electrode of the first MOS transistor P1, and the gate electrode of the second MOS transistor P2 is electrically connected to the source electrode of the second MOS transistor P2. The source electrode of the third MOS transistor N1 is electrically connected to the power supply signal input terminal 6, and the gate electrode of the third MOS transistor N1 is electrically connected between the drain electrode of the first MOS transistor P1 and the drain electrode of the second MOS transistor P2. The drain electrode of the fourth MOS transistor N2 is electrically connected to the drain electrode of the third MOS transistor N1, the gate electrode of the fourth MOS transistor N2 is electrically connected to the source electrode of the second MOS transistor P2, and the source electrode of the fourth MOS transistor N2 is electrically connected to the disconnection detection output terminal 9. When the sensor chip 2 is in a conducting state with the power supply end VDD and the ground end GND, the first MOS tube P1 is conducted, and a 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 conducted, and the current 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 conducted, and thus, the disconnection detection output end 9 outputs a first electrical signal, which indicates 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 transistor P1 is in a disconnected state, so that the third MOS transistor N1 is turned off, the second MOS transistor P2 is also in a disconnected state, so that the fourth MOS transistor 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, which indicates that the signal output by the sensor chip 2 is an abnormal signal.
In some embodiments, the first MOS transistor P1, the second MOS transistor P2, the third MOS transistor N1, and the fourth MOS transistor N2 are all high voltage MOS transistors, which is beneficial to allow a larger voltage to pass through.
In some embodiments, the detection and control circuit 11 further includes a first resistor R1, one end of the first resistor R1 is electrically connected between the drain of the first MOS transistor P1 and the gate of the third MOS transistor N1, and the other end is electrically connected to the source of the third MOS transistor N1. When the sensor chip 2 and the ground GND are in a disconnected state, the first resistor R1 turns off the third MOS transistor N1. In this embodiment, the disconnection detection output terminal 9 is electrically connected to a pull-up resistor Rpu, and when the sensor chip 2 is disconnected from the ground GND, the first MOS transistor P1 is turned off, but due to the presence of the pull-up resistor Rpu, a voltage may exist between the drain of the first MOS transistor P1 and the drain of the second MOS transistor P2 in the circuit, so that a state where the third MOS transistor N1 is turned on may occur, therefore, the first resistor R1 is short-circuited between the gate and the source of the third MOS transistor N1, so that the third MOS transistor N1 is turned off, and the entire power supply signal transmission circuit 12 is in a non-power state, so that the pull-up resistor Rpu pulls the voltage signal transmitted to the disconnection detection output terminal 9 to a high level signal, and further, the detection terminal 10 of the controller 8 may detect that the voltage at the disconnection detection output terminal 9 is a power supply terminal VDD voltage, and further, the controller 8 may recognize that the signal output by the sensor chip 2 is an abnormal signal.
Fig. 11 is a circuit diagram of an embodiment of the power supply disconnection detecting system 1 of the present application shown in fig. 8. As shown in fig. 11, in some embodiments, the detection and control circuit 11 further includes a second resistor R2, one end of the second resistor R2 is electrically connected between the source of the second MOS transistor P2 and the gate of the fourth MOS transistor N2, and the other end is electrically connected to the source of the fourth MOS transistor N2. When the sensor chip 2 and the ground GND are in a disconnected state, the second resistor R2 turns off the fourth MOS transistor N2. 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 transistor P1 is turned off, but due to the existence of the pull-down resistor Rpd, a voltage exists between the source of the second MOS transistor P2 and the source of the fourth MOS transistor N2 in the circuit, so that a state where the fourth MOS transistor N2 is turned on may occur, therefore, the fourth MOS transistor N2 is turned off by short-circuiting the second resistor R2 between the gate and the source of the fourth MOS transistor N2, and the disconnection detection output end 9 is in an electroless state, so that the pull-down resistor Rpd pulls down a signal transmitted to the disconnection detection output end 9 to a low level signal, and then 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 further the controller 8 can recognize that the signal output by the sensor chip 2 is an abnormal signal.
In some embodiments, the detection and control circuit 11 further includes a charge pump 16, and the charge pump 16 is electrically connected between the power supply terminal VDD and the source of the first MOS transistor P1. The charge pump 16 is used for boosting the voltage of the power supply terminal VDD to make the voltage input to the first MOS transistor P1 higher than the voltage of the power supply terminal VDD by 3V. For example, the voltage of the power supply terminal VDD may be 5V, so that after the voltage is boosted by the charge pump 16, the voltage input to the source of the first MOS transistor P1 is 8V, and the turn-on voltage of the first MOS transistor P1 is 7V, which is favorable for smooth turn-on of the first MOS transistor P1.
As shown in fig. 6 and 8, in some embodiments, the power outage detection system 1 further includes a buffer 17, and the buffer 17 is disposed in the sensor chip 2 and electrically connected between the power supply terminal VDD and the power supply signal input terminal 6. The buffer 17 is used for driving the voltage signal transmitted to the power supply signal transmission circuit 12, and is beneficial to the conduction of the third MOS transistor N1 of the power supply signal transmission circuit 12 when the power pin 3 of the sensor chip 2 is connected with the power supply end VDD.
The foregoing description is only an example of the present invention and should not be construed as limiting the invention, as it will be apparent to those skilled in the art that various modifications and variations in form and detail can be made without departing from the principle and structure of the invention after understanding the present disclosure and the principles, but such modifications and variations are considered to be within the scope of the appended claims.

Claims (10)

1. A power supply disconnection detection system, comprising:
the device comprises a sensor chip, and a power supply end and a ground end which are electrically connected with the sensor chip;
the power supply signal input end is arranged in the sensor chip and is used for being electrically connected with the power supply end;
the broken line detection circuit is arranged in the sensor chip, is electrically connected with the power supply signal input end and comprises a broken line detection output end; and
and 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 end or the ground end according to the electric signal.
2. A power supply disconnection detection system according to claim 1, wherein said electrical signals comprise a first electrical signal and a second electrical signal; the disconnection detection circuit includes:
a detection and control circuit;
the power supply signal transmission circuit comprises a first end, a second end and a third end, wherein the first end is electrically connected with the detection and 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 is in a conducting state with the power supply end and the ground end, the detection and control circuit conducts the power supply signal transmission circuit, so that the broken line detection output end outputs the first electric signal;
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, so that the broken line detection output end outputs the second electric signal.
3. The power supply disconnection detecting system according to claim 2, wherein the disconnection detecting 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 transmitting circuit and the controller, and the other end of the pull-up resistor is electrically connected with the power supply terminal;
when the sensor chip is disconnected with the power supply end or the ground end, the detection and control circuit enables the power supply signal transmission circuit to be disconnected, and the second electric signal transmitted to the disconnection detection output end is pulled up 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 is electrically connected between the third end of the power supply signal transmission circuit and the controller, and the other end of the pull-down resistor is electrically connected with the ground end;
when the sensor chip is disconnected from the power supply end or the ground end, the detection and control circuit enables the power supply signal transmission circuit to be disconnected, and the second electric signal transmitted to the broken line detection output end is pulled down to a low level signal through the pull-down resistor.
4. The power supply disconnection detection system according to claim 2, wherein the detection and control circuit comprises a first MOS transistor and a second MOS transistor; the power supply signal transmission circuit comprises a third MOS tube and a fourth MOS tube;
the source electrode of the first MOS tube is electrically connected with the power supply end, and the grid electrode of the first MOS tube is connected with the ground end; the drain electrode of the second MOS tube is electrically connected with the drain electrode of the first MOS tube, and the grid electrode of the second MOS tube is electrically connected with the source electrode of the second MOS tube; the source electrode of the third MOS tube is electrically connected with the power supply signal input end, and the grid electrode of the third MOS tube is electrically connected between the drain electrode of the first MOS tube and the drain electrode of the second MOS tube; the drain electrode of the fourth MOS tube is electrically connected with the drain electrode of the third MOS tube, the grid electrode of the fourth MOS tube is electrically connected with the source electrode of the second MOS tube, and the source electrode of the fourth MOS tube is electrically connected with the disconnection detection output end;
when the sensor chip is in a conducting state with the power supply end and the ground end, the first MOS tube enables the third MOS tube to be conducted, and the second MOS tube enables the fourth MOS tube to be conducted, so that the broken line detection output end outputs the first electric signal;
when the sensor chip and the power supply end are in a disconnected state, the first MOS tube enables the third MOS tube to be turned off, and the second MOS tube enables the fourth MOS tube to be turned off, so that the second electric signal is output by the broken line detection output end.
5. The system according to claim 4, wherein the detection circuit further comprises a first resistor, one end of the first resistor is electrically connected between the drain of the first MOS transistor and the gate of the third MOS transistor, and the other end of the first resistor is electrically connected to the source of the third MOS transistor;
when the sensor chip and the ground end are in a disconnected state, the first resistor enables the third MOS tube to be turned off.
6. The power supply disconnection detecting system according to claim 4, wherein the detection and control circuit further comprises a second resistor, one end of the second resistor is electrically connected between the source of the second MOS transistor and the gate of the fourth MOS transistor, and the other end of the second resistor is electrically connected to the source of the fourth MOS transistor;
when the sensor chip and the ground end are in a disconnected state, the second resistor enables the fourth MOS tube to be turned off.
7. The power supply disconnection detection system according to claim 4, wherein the first MOS transistor, the second MOS transistor, the third MOS transistor and the fourth MOS transistor are all high-voltage MOS transistors.
8. The system according to claim 4, wherein the detection circuit further comprises a charge pump electrically connected between the power supply terminal and the source of the first MOS transistor.
9. The power outage detection system according to claim 1, further comprising a buffer disposed within the sensor chip and electrically connected between the power supply terminal and the power supply signal input terminal.
10. A vehicle system comprising a power outage detection system according to any one of claims 1-9 above.
CN202211410154.9A 2022-11-10 2022-11-10 Power supply broken line detection system and vehicle system Pending CN115629337A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN202211410154.9A CN115629337A (en) 2022-11-10 2022-11-10 Power supply broken line detection system and vehicle system
PCT/CN2022/143271 WO2024098537A1 (en) 2022-11-10 2022-12-29 Power supply disconnection detection system and vehicle system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211410154.9A CN115629337A (en) 2022-11-10 2022-11-10 Power supply broken line detection system and vehicle system

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Publication number Priority date Publication date Assignee Title
JP3918614B2 (en) * 2002-04-09 2007-05-23 富士電機デバイステクノロジー株式会社 Disconnection failure detection circuit
JP2008245036A (en) * 2007-03-28 2008-10-09 Seiko Epson Corp Semiconductor integrated circuit and short-circuit detection method of its output terminal
JP2011089849A (en) * 2009-10-21 2011-05-06 Asahi Kasei Electronics Co Ltd Wire breaking detector
JP2011089850A (en) * 2009-10-21 2011-05-06 Asahi Kasei Electronics Co Ltd Wire break detecting and reverse connection protecting apparatus
JP5768016B2 (en) * 2012-07-25 2015-08-26 日立オートモティブシステムズ株式会社 Sensor device
CN114879006A (en) * 2022-04-25 2022-08-09 重庆睿歌微电子有限公司 Chip disconnection detection circuit and method and chip

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