CN116742584A - Protection circuit, power supply circuit and automatic driving vehicle based on state detection - Google Patents
Protection circuit, power supply circuit and automatic driving vehicle based on state detection Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/05—Details with means for increasing reliability, e.g. redundancy arrangements
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
- H02H5/04—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
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Abstract
The disclosure provides a protection circuit, a power supply circuit and an automatic driving vehicle based on state detection, relates to the technical field of circuit protection, and particularly relates to the technical field of overheat detection circuits, and can be applied to a high-power supply design scene. The specific implementation scheme is as follows: the protection circuit includes: the power supply comprises a voltage input end, a voltage output end, a first transmission device, a second transmission device, a first state monitoring feedback circuit, a second state monitoring feedback circuit and a power supply management chip; the voltage input end, the first transmission device, the second transmission device and the voltage output end are sequentially connected through connecting wires; the first state monitoring feedback circuit is used for detecting the working state of the first transmission device and is connected with the control end of the second transmission device through the power management chip; and the second state monitoring feedback circuit is used for detecting the working state of the second transmission device and is connected with the control end of the first transmission device. The present disclosure improves the safety of the circuit.
Description
Technical Field
The disclosure relates to the technical field of circuit protection, in particular to the technical field of overheat detection circuits, and particularly relates to a protection circuit, a power supply circuit and an automatic driving vehicle based on state detection, which can be applied to a high-power supply design scene.
Background
With the continuous development of automatic driving technology in the automotive field, the calculation power requirement of the high-order automatic driving vehicle on the controller is also higher and higher, and accordingly, the controller needs a high-power supply design to ensure the requirement of a high-calculation power chip on power consumption. Under the working condition of high power line current, in order to meet the requirements of stability, surge protection, hot plug and the like of a power supply circuit, the power supply circuit is generally realized by designing a special E-Fuse (one-time programmable memory) circuit. The existing E-Fuse circuit can realize fault detection of under-voltage and over-voltage states of input voltage, and can realize protection of a later stage load circuit by controlling the opening, closing, state resetting and the like of a transmission device, so that uncertainty damage caused by the fact that the load circuit is in an abnormal working condition under the condition of abnormal power supply voltage input is avoided. The premise of the existing E-Fuse circuit for achieving the preset target is that all devices in the circuit are in a normal connection/heat dissipation state, and the working state of key devices cannot be detected.
Disclosure of Invention
The disclosure provides a protection circuit, a power supply circuit and an automatic driving vehicle based on state detection.
According to a first aspect, there is provided a protection circuit based on state detection, comprising: the power supply comprises a voltage input end, a voltage output end, a first transmission device, a second transmission device, a first state monitoring feedback circuit, a second state monitoring feedback circuit and a power supply management chip; the voltage input end, the first transmission device, the second transmission device and the voltage output end are sequentially connected through connecting wires; the first state monitoring feedback circuit is used for detecting the working state of the first transmission device and is connected with the control end of the second transmission device through the power management chip; and the second state monitoring feedback circuit is used for detecting the working state of the second transmission device and is connected with the control end of the first transmission device.
According to a second aspect, there is provided a power supply circuit comprising: a power supply, a protection circuit as described in any implementation of the first aspect, and a load circuit; the power supply is connected with the load circuit through the protection circuit.
According to a third aspect, there is provided an autonomous vehicle provided with a power supply circuit as described in the first aspect.
According to the technology disclosed by the disclosure, a protection circuit based on state detection is provided, a first transmission device and a second transmission device are mutually matched, the switching-off of one transmission device is controlled through the real-time monitoring of the working state of the other transmission device, the mutual control between the two transmission devices is realized, when the state of one transmission device is abnormal, the switching-off of a main circuit between a voltage input end and a voltage output end is realized through the switching-off of the other transmission device, the devices in the circuit are protected, and the safety of the circuit is improved.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the disclosure, nor is it intended to be used to limit the scope of the disclosure. Other features of the present disclosure will become apparent from the following specification.
Drawings
The drawings are for a better understanding of the present solution and are not to be construed as limiting the present disclosure. Wherein:
FIG. 1 is a schematic diagram of one embodiment of a state detection based protection circuit according to the present disclosure;
FIG. 2 is a schematic diagram of yet another embodiment of a state detection based protection circuit according to the present disclosure;
FIG. 3 is a schematic diagram of yet another embodiment of a state detection based protection circuit according to the present disclosure;
fig. 4 is a schematic diagram of one embodiment of a power supply circuit according to the present disclosure.
Detailed Description
Exemplary embodiments of the present disclosure are described below in conjunction with the accompanying drawings, which include various details of the embodiments of the present disclosure to facilitate understanding, and should be considered as merely exemplary. Accordingly, one of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the present disclosure. Also, descriptions of well-known functions and constructions are omitted in the following description for clarity and conciseness.
In the technical scheme of the disclosure, the related processes of collecting, storing, using, processing, transmitting, providing, disclosing and the like of the personal information of the user accord with the regulations of related laws and regulations, and the public order colloquial is not violated.
Fig. 1 shows a schematic diagram of the connection relationship of the protection circuit based on state detection of the present disclosure.
The protection circuit based on state detection comprises a voltage input end 1, a voltage output end 2, a first transmission device 3, a second transmission device 4, a first state monitoring feedback circuit 5, a second state monitoring feedback circuit 6 and a power management chip 7.
The connection relation between the devices in the protection circuit is as follows:
the voltage input end, the first transmission device, the second transmission device and the voltage output end are sequentially connected through connecting wires; the first state monitoring feedback circuit is used for detecting the working state of the first transmission device and is connected with the control end of the second transmission device through the power management chip; and the second state monitoring feedback circuit is used for detecting the working state of the second transmission device and is connected with the control end of the first transmission device.
The first transmission device and the second transmission device are three-terminal devices having an input terminal, an output terminal and a control terminal, and the control terminal is used for controlling the connection and disconnection between the input terminal and the output terminal according to the received control signal. When the transmission device is in a communication state, the input end can receive the voltage and output the voltage by the output end, so that the voltage transmission is performed; when in the off state, the transmission device can receive the voltage received by the input end and can not be output by the output end, and voltage transmission can not be performed. As an example, the first and second transmission devices may be semiconductor devices such as field effect transistors, triodes, and the like. Taking a field effect transistor as an example, the input end and the output end may be a source electrode or a drain electrode of the field effect transistor, respectively, and the control end may be a gate electrode of the field effect transistor.
The first state monitoring feedback circuit is used for monitoring whether the working state of the first transmission device is normal or not, when the first transmission device is detected to be in an abnormal working state, a feedback signal is sent to the power management chip, and the power management chip turns off the second transmission device by controlling the control end of the second transmission device, so that the voltage input end and the voltage output end are in an open circuit state, and devices in the circuit, particularly the transmission device, are prevented from being damaged due to the abnormal state.
In a real situation, the transmission device has a possibility of poor welding in the process of pasting the components of the PCB (Printed Circuit Board ) due to a larger area of the welding pad, for example, poor welding of the drain electrode can be caused when the bubbles of the drain electrode welding pad of the N-channel field effect tube are more.
Poor bonding of the transmission device pads may lead to several possible failure mechanisms: the welding strength is reduced due to poor welding, and the cracking is caused under severe working conditions for a long time; the electrical connection performance is reduced due to poor welding, and heat accumulation is caused under long-time high-temperature working conditions.
Because the above-mentioned bad situation can't be in time found through the short-time test to PCB, so once appear bad, can greatly improve the risk that breaks down in the use, be in the transmission device under the heat dissipation abnormal state for a long time, the condition that can appear overheated damage under serious condition more. In such a case, it may be determined whether the transfer device is in an abnormal operation state by detecting whether the temperature of the transfer device is excessively high.
Similarly, the second state monitoring feedback circuit is used for monitoring whether the working state of the second transmission device is normal, and when the second transmission device is detected to be in an abnormal working state, a feedback signal is sent to the control end of the second transmission device to turn off the first transmission device, so that the voltage input end and the voltage output end are in an open circuit state, and devices in the circuit, particularly the transmission device, are prevented from being damaged due to the abnormal state.
The first and second state monitoring feedback circuits may be implemented based on a temperature sensitive detection device to generate a control signal to a control terminal of the other transmission device based on a perception of an operating temperature of the transmission device. The temperature sensitive detection device is, for example, a semiconductor temperature sensor, thermocouple, or the like.
The power management chip is a chip with power protection functions such as under-voltage locking, over-voltage protection and reverse power protection, for example, the power management chip can be a chip such as LTC4364, TPS2595, BD39001EKV, and the like.
In the protection circuit based on state detection provided by the embodiment, the first transmission device and the second transmission device are mutually matched, the switching-off of one transmission device is controlled through the real-time monitoring of the working state of the other transmission device, the mutual control between the two transmission devices is realized, when the state of one transmission device is abnormal, the switching-off of the main circuit between the voltage input end and the voltage output unit is realized through the mode of switching-off the other transmission device, the devices in the circuit are protected, and the safety of the circuit is improved.
With continued reference to fig. 2, a schematic diagram of a connection structure of one embodiment of a protection circuit based on state detection is shown.
In some alternative implementations, as shown in fig. 2, the first condition monitoring feedback circuit 5 includes: a first voltage dividing circuit 51, a second voltage dividing circuit 52, and a first voltage comparator 53.
The input end of the first transmission device is connected with the inverting input end of the first voltage comparator through the first voltage dividing circuit, and the output end of the first transmission device is connected with the non-inverting input end of the first voltage comparator through the second voltage dividing circuit; the output end of the first voltage comparator is connected with a power input pin of the power management chip; the preset driving pin of the power management chip is connected with the control end of the second transmission device.
As an example, the first voltage dividing circuit and the second voltage dividing circuit are each formed by connecting two resistors in series. The first voltage dividing circuit comprises resistors R21 and R22, and the second voltage dividing circuit comprises resistors R23 and R24. One end of the first voltage dividing circuit is connected with the input end of the first transmission device, the other end of the first voltage dividing circuit is grounded, and a common connection point between the resistors R21 and R22 is connected with the inverting input end of the first voltage comparator. One end of the second voltage dividing circuit is connected with the output end of the first transmission device, the other end of the second voltage dividing circuit is grounded, and a common connection point between the resistors R23 and R24 is connected with the non-inverting input end of the first voltage comparator. The output end of the first voltage comparator is connected with a power input pin VCC of the power management chip through a resistor R25, and a preset driving pin HGATE of the power management chip is connected with the control end of the second transmission device through a resistor R3.
The first voltage comparator further comprises a power input end and a grounding end, wherein the power input end is connected with a connecting wire between the voltage input end and the voltage output end.
In the implementation manner, the specific implementation manner of the first state monitoring feedback circuit is provided, the monitoring of the working state of the first transmission device can be realized based on a simple circuit structure, and the feasibility and the economy of the first state monitoring feedback circuit are improved.
In some alternative implementations of this embodiment, the voltage value of the non-inverting input of the first voltage comparator is higher than the voltage value of the inverting input of the first voltage comparator under normal operating conditions of the first transmission device.
By designing the voltage dividing resistance values of the resistors in the first voltage dividing circuit and the second voltage dividing circuit, when the first transmission device is in a normal state, the voltage value of the non-inverting input end of the first voltage comparator is larger than the voltage value of the inverting input end, and therefore the output signal of the output end of the first voltage comparator is locked in a high level state. The power input pin VCC of the power management chip is electrified, the power management chip starts to work, and the second transmission device is controlled to be opened through the pin of the preset drive pin HGATE.
In the implementation manner, the voltage dividing resistance values of the resistors in the first voltage dividing circuit and the second voltage dividing circuit are designed, so that the voltage value of the non-inverting input end of the first voltage comparator is higher than the voltage value of the inverting input end of the first voltage comparator under the normal working condition of the first transmission device, the second transmission device is controlled to be normally opened under the normal working condition of the first transmission device, and the voltage transmission between the voltage input end and the voltage output end under the normal working condition can be ensured.
In some alternative implementations of this embodiment, the voltage value of the non-inverting input of the first voltage comparator is lower than the voltage value of the inverting input of the first voltage comparator during abnormal operation of the first transmission device.
When the pin of the first transmission device is in poor welding, which results in abnormal heat dissipation of the first transmission device, and on-resistance RDSon of the first transmission device in an on state is increased based on heat accumulation, the voltage value of the inverting input end of the first voltage comparator is higher than that of the non-inverting input end, the output end of the first voltage comparator is pulled down to the ground potential, the voltage of the power input pin VCC of the power management chip is pulled down below the minimum limit value of the normal working voltage range of the power management chip, the power management chip is powered down and then the second transmission device is turned off, so that the main power supply circuit between the voltage input end and the voltage output end is turned off, and heat accumulation possibly caused by long-time working of the first transmission device in a high-impedance state is prevented, and the situation of damaging the device is further caused.
In the implementation manner, the voltage dividing resistance values of the resistors in the first voltage dividing circuit and the second voltage dividing circuit are designed, so that the voltage value of the positive input end of the first voltage comparator is lower than the voltage value of the negative input end of the first voltage comparator under the abnormal working condition of the first transmission device, the second transmission device is turned off, the first transmission device is prevented from being damaged due to long-time working in a high-impedance state, the first transmission device is protected, and the safety of the circuit is improved.
In some alternative implementations of the present embodiment, the power input pins of the power management chip are connected to the connection lines between the voltage input terminals and the voltage output terminals.
As an example, the power input pin VCC of the power management chip is connected to the connection line through a resistor R2. The output end of the first transmission device is grounded through resistors R1, R6 and R7 which are connected in series, the common connection point of the resistors R1 and R6 is connected with the UV pin of the power management chip, and the common connection point of the resistors R6 and R7 is connected with the OV pin of the power management chip.
Because the pin welding of the first transmission device is bad, the heat dissipation of the first transmission device is abnormal, and when the on-resistance RDSon of the first transmission device is increased based on heat accumulation, the voltage value of the inverting input end of the first voltage comparator is higher than that of the non-inverting input end, the output end of the first voltage comparator is pulled down to the ground potential, and the pin VCC or SHDN is pulled down to be below the minimum limit value of the normal working voltage range of the power management chip according to the voltage dividing circuit formed by the resistors R2 and R25, so that the second transmission device is turned off, the first transmission device is prevented from being damaged due to long-time working in a high impedance state, the first transmission device is protected, and the safety of the circuit is further improved.
In some alternative implementations of the present embodiment, the second condition monitoring feedback circuit 6 includes: a third voltage dividing circuit 61, a fourth voltage dividing circuit 62, and a second voltage comparator 63.
The input end of the second transmission device is connected with the inverting input end of the second voltage comparator through a third voltage dividing circuit, and the output end of the second transmission device is connected with the non-inverting input end of the second voltage comparator through a fourth voltage dividing circuit; the output end of the second voltage comparator is connected with the control end of the first transmission device.
As an example, the third voltage dividing circuit and the fourth voltage dividing circuit are each formed by connecting two resistors in series. The third voltage dividing circuit comprises resistors R11 and R12, and the fourth voltage dividing circuit comprises resistors R13 and R14. One end of the third voltage dividing circuit is connected with the input end of the second transmission device, the other end of the third voltage dividing circuit is grounded, and the common connection point of the resistors R11 and R12 is connected with the reverse input end of the second voltage comparator; one end of the fourth voltage dividing circuit is connected with the output end of the second transmission device, the other end of the fourth voltage dividing circuit is grounded, and the common connection point of the resistors R13 and R14 is connected with the positive input end of the second voltage comparator. The output end of the second voltage comparator is connected with the control end of the first transmission device through a resistor R15.
The second voltage comparator further comprises a power input end and a grounding end, wherein the power input end is connected with a high potential, and the grounding end is grounded.
In the implementation manner, the specific implementation manner of the second state monitoring feedback circuit is provided, the monitoring of the working state of the second transmission device can be realized based on a simple circuit structure, and the feasibility and the economy of the second state monitoring feedback circuit are improved.
In some alternative implementations of this embodiment, the voltage value of the non-inverting input of the second voltage comparator is higher than the voltage value of the inverting input of the second voltage comparator under normal operating conditions of the second transmission device.
By designing the voltage dividing resistance values of the resistors in the third voltage dividing circuit and the fourth voltage dividing circuit, when the second transmission device is in a normal state, the voltage value of the non-inverting input end of the second voltage comparator is larger than the voltage value of the inverting input end, so that an output signal of the output end of the second voltage comparator is locked in a high-level state, and the first transmission device is controlled to be opened.
In the implementation manner, the voltage dividing resistance values of the resistors in the third voltage dividing circuit and the fourth voltage dividing circuit are designed, so that the voltage value of the non-inverting input end of the second voltage comparator is higher than the voltage value of the inverting input end of the first voltage comparator under the normal working condition of the second transmission device, the second transmission device is controlled to be normally opened under the normal working condition, and the voltage transmission between the voltage input end and the voltage output end under the normal working condition can be ensured.
In some alternative implementations of the present embodiment, the voltage value of the non-inverting input of the second voltage comparator is lower than the voltage value of the inverting input of the second voltage comparator during abnormal operation of the second transmission device.
When the heat dissipation of the second transmission device is abnormal due to poor welding of the pins of the second transmission device and the on-resistance RDSon of the second transmission device in the on state is increased due to heat accumulation, the voltage value of the inverting input end of the second voltage comparator is higher than that of the non-inverting input end, the output end of the second voltage comparator is pulled down to the ground potential, and then the first transmission device is turned off, so that a main power supply circuit between the voltage input end and the voltage output end is turned off, and heat accumulation possibly caused by long-time working of the second transmission device in the high-impedance state is prevented, and further damage is caused.
In the implementation manner, the voltage dividing resistance values of the resistors in the third voltage dividing circuit and the fourth voltage dividing circuit are designed, so that the voltage value of the positive input end of the second voltage comparator is lower than the voltage value of the negative input end of the second voltage comparator under the abnormal working condition of the second transmission device, the first transmission device is turned off, the second transmission device is prevented from being damaged due to long-time working in a high-impedance state, the second transmission device is protected, and the safety of the circuit is improved.
In some optional implementations of this embodiment, the protection circuit further includes: a fifth voltage dividing circuit 8 and a first voltage boosting circuit 9; the voltage input end is connected with the fifth voltage dividing circuit through the voltage boosting circuit, and the output end of the second voltage comparator is connected with the control end of the first transmission device through the fifth voltage dividing circuit.
As an example, the fifth voltage dividing circuit includes resistors R16 and R17 connected in series, and a common connection point of the resistors R16 and R17 is connected to an output terminal of the second voltage comparator through a resistor R15. In this implementation manner, the power input pin of the second voltage comparator is connected to the voltage input terminal through the first boost circuit.
In this implementation manner, the control terminal of the first transmission device can be controlled more flexibly through the fifth voltage dividing circuit and the first voltage boosting circuit, which is helpful for improving the design flexibility of the protection circuit.
Specifically, after the protection circuit normally applies the power supply voltage VIN, the first transmission device is controlled to be opened through the first voltage boosting circuit and the fifth voltage dividing circuit; the VCC pin of the power management chip is powered on through a resistor R2 to start working, and the second transmission device is controlled to be opened through the HGATE pin. At this time, the main power supply line from the voltage input terminal VIN to the voltage output terminal VOUT is normally connected, and supplies current to the load circuit following the voltage output terminal VOUT. The voltage value V of the control end of the first transmission device at the moment G_Q1 In order to achieve this, the first and second,
designing and utilizing a first voltage dividing circuit and a second voltage dividing circuitThe voltage dividing circuit makes the voltage value of the non-inverting input end of the first voltage comparator larger than the voltage value of the inverting input end, so that the output end of the first voltage comparator is locked in a high level state. Since the first voltage comparator is in the saturated output state and the power is supplied from VIN, the level of the output terminal of the first voltage comparator can be considered to be approximately equal to VIN at this time. At this time, the control terminal voltage value V of the first transmission device G_Q1 The 'is' the number of the components,
due toThen V can be determined G_Q1 <V G_Q1 ′
In general, the control terminal voltage of the first transmission device is ensured to be fully opened when the control terminal voltage is within a certain range, due to V G_Q1 <V G_Q1 ' let V through calculation G_Q1 The first pass device may be normally turned on without exceeding a maximum limit of a normal voltage range of the control terminal of the first pass device.
When the second transmission device is poor in heat dissipation state due to poor welding and RDSon is increased due to heat accumulation, the voltage value of the inverting input end of the second voltage comparator is higher than that of the non-inverting input end, and the output end of the second voltage comparator is pulled down to the ground potential. The voltage value of the control end of the first transmission device is V G_Q1 "，
Because:
therefore V G_Q1 "<V G_Q1
Normally, the first transmission device is guaranteed to be opened only when the voltage of the control terminal is within a certain range, due to V G_Q1 "<V G_Q1 By calculation, let V G_Q1 The first transmission device can be turned off under the condition that the minimum limit value of the voltage range of the control end of the first transmission device is lower than the minimum limit value, so that the main power supply circuit is turned off, and the situation that the first transmission device is damaged due to long-time working in a high-temperature state is prevented.
With continued reference to fig. 3, a schematic diagram of a connection structure of another embodiment of a protection circuit based on state detection is shown.
In some alternative implementations of the present embodiment, the first condition monitoring feedback circuit 5 includes: a first thermistor having a positive temperature coefficient; the first thermistor is used for detecting the temperature of the first transmission device, and the output end of the first transmission device is connected with the power input pin of the power management chip through a voltage dividing circuit comprising the first thermistor; the preset driving pin of the power management chip is connected with the control end of the second transmission device.
The first thermistor is a semiconductor resistor typically having a temperature-sensitive characteristic, and its resistance value increases stepwise with an increase in temperature above a certain temperature. The first thermistor may be positioned proximate to the first transmitting device when the circuit is designed.
When the temperature of the first transmission device is abnormal, the self impedance of the first thermistor is rapidly increased along with the increase of the ambient temperature to an action threshold value, and the potential between the first thermistor and the resistor R21 is pulled down through a voltage dividing circuit formed by the first thermistor and the resistor R21, so that the potential between the R21 and the R22 is pulled below the working voltage of the power management chip, the power management chip is powered down and turned off, the second transmission device is turned off, and the main circuit between the voltage input end and the voltage output end is turned off, so that the continuous temperature increase of the first transmission device under the conduction condition is prevented, and damage caused by the continuous temperature increase is avoided.
In the implementation mode, the state detection of the first transmission device can be realized through the voltage dividing circuit comprising the thermistor, and the feasibility and the economy of the first state monitoring feedback circuit are further improved.
In some alternative implementations of the present embodiment, the second condition monitoring feedback circuit 6 includes: a second thermistor having a negative temperature coefficient; the second thermistor is used for detecting the temperature of the second transmission device; the second thermistor is connected with the control end of the first transmission device.
The second thermistor is a semiconductor resistor with a negative temperature coefficient, which decreases exponentially with the temperature rise resistance. The second thermistor is placed close to the second transmitting device when the circuit is designed.
When the temperature of the second transmission device is abnormal, the self impedance of the second thermistor is rapidly reduced along with the rise of the ambient temperature to an action threshold value, so that the control end of the first transmission device is controlled to be in a low-level state, and the first transmission device is closed.
In the implementation mode, the state detection of the second transmission device can be realized through the thermistor, and the feasibility and the economy of the second state monitoring feedback circuit are further improved.
In some optional implementations of this embodiment, the protection circuit further includes: a sixth voltage dividing circuit 10 and a second voltage boosting circuit 11; the voltage input end is connected with the sixth voltage dividing circuit through the second voltage boosting circuit, and the second thermistor is connected with the control end of the first transmission device through the sixth voltage dividing circuit.
As an example, the sixth voltage dividing circuit includes resistors R11 and R12 connected in series. When the temperature of the second transmission device is abnormal, the self impedance of the second thermistor is rapidly reduced along with the rise of the ambient temperature to an action threshold, the voltage of the control end of the first transmission device is pulled down to be below the voltage limit value required by opening the first transmission device through a voltage dividing circuit consisting of R11 and R12, and the main power supply line is cut off through the first transmission device, so that the condition that the second transmission device is damaged due to continuous accumulation of heat is prevented.
In the implementation manner, the flexibility and feasibility of design are further improved based on the sixth voltage dividing circuit and the second voltage boosting circuit.
With continued reference to fig. 4, a schematic diagram of the connection of the power supply circuit of the present disclosure is shown.
The power supply circuit includes a power supply 12, a protection circuit 13 as described in the above embodiments, and a load circuit 14. The power supply is connected with the load circuit through the protection circuit.
Wherein the load circuit may be a circuit providing any type of load. As an example, the load circuit may be a load circuit corresponding to an autopilot module in an autopilot.
In this embodiment, the power supply in the power supply circuit supplies power to the subsequent load circuit through the protection circuit based on state detection, so that the safety of the power supply circuit is improved.
In this embodiment, there is provided an automated guided vehicle on which the power supply circuit described in the above embodiment is provided.
Autopilot vehicles are typically composed of a plurality of modules, each module having a specific function. As an example, an automated driving vehicle includes the following functional modules:
a sensor module: the system is used for measuring physical quantity of surrounding environment and detecting vehicle state information, including cameras, radars, lidars and inertial navigation systems (IMU), so as to acquire scene information and real-time road condition data.
And a map module: generate a map and manage the location estimation process. Mapping is typically performed using laser or vision sensors, which can provide critical information for path planning.
And a positioning module: and determining the position specific coordinates of the vehicle in the map, matching the position specific coordinates with the map in the map library, and calibrating the position error so as to determine the related information such as the vehicle driving direction.
Decision planning module: based on the collected environmental information, vehicle conditions, running task demands and other data, a proper vehicle running strategy is formulated, and complex running scenes such as right turn, left turn and lane change are processed, so that the running safety of the vehicle is ensured.
And the control module is used for: the instructions after decision making are transmitted to various control systems of the vehicle, such as motors, brakes, steering and the like, so as to control the running of the vehicle and implement various actions.
And a data processing module: processes and manages the data acquired by all the sensors and performs various related operations and calculations inside the vehicle.
These modules typically cooperate through a high-speed, low-latency network connection to implement autopilot technology. Based on the power supply circuit, the reliability and the safety of the automatic driving vehicle are further improved on the basis of meeting the power supply requirement of the automatic driving vehicle.
Claims (14)
1. A protection circuit based on state detection, comprising: the power supply comprises a voltage input end, a voltage output end, a first transmission device, a second transmission device, a first state monitoring feedback circuit, a second state monitoring feedback circuit and a power supply management chip;
the voltage input end, the first transmission device, the second transmission device and the voltage output end are sequentially connected through connecting wires;
the first state monitoring feedback circuit is used for detecting the working state of the first transmission device and is connected with the control end of the second transmission device through the power management chip;
the second state monitoring feedback circuit is used for detecting the working state of the second transmission device and is connected with the control end of the first transmission device.
2. The protection circuit of claim 1, wherein:
the first state monitoring feedback circuit includes: the first voltage dividing circuit, the second voltage dividing circuit and the first voltage comparator;
the input end of the first transmission device is connected with the inverting input end of the first voltage comparator through the first voltage dividing circuit, and the output end of the first transmission device is connected with the non-inverting input end of the first voltage comparator through the second voltage dividing circuit;
the output end of the first voltage comparator is connected with a power input pin of the power management chip;
and a preset driving pin of the power management chip is connected with the control end of the second transmission device.
3. The protection circuit of claim 2, wherein:
and under the normal working condition, the voltage value of the non-inverting input end of the first voltage comparator is higher than that of the inverting input end of the first voltage comparator.
4. The protection circuit of claim 2, wherein:
and under the abnormal working condition, the voltage value of the non-inverting input end of the first voltage comparator is lower than that of the inverting input end of the first voltage comparator.
5. The protection circuit of claim 1, wherein:
the first state monitoring feedback circuit includes: a first thermistor having a positive temperature coefficient;
the first thermistor is used for detecting the temperature of the first transmission device, and the output end of the first transmission device is connected with the power input pin of the power management chip through a voltage dividing circuit comprising the first thermistor;
and a preset driving pin of the power management chip is connected with the control end of the second transmission device.
6. The protection circuit of claim 1, wherein:
and a power input pin of the power management chip is connected with the connecting wire.
7. The protection circuit of claim 1, wherein:
the second state monitoring feedback circuit includes: a third voltage dividing circuit, a fourth voltage dividing circuit, and a second voltage comparator;
the input end of the second transmission device is connected with the inverting input end of the second voltage comparator through the third voltage dividing circuit, and the output end of the second transmission device is connected with the non-inverting input end of the second voltage comparator through the fourth voltage dividing circuit;
and the output end of the second voltage comparator is connected with the control end of the first transmission device.
8. The protection circuit of claim 7, wherein:
and under the normal working condition, the voltage value of the non-inverting input end of the second voltage comparator is higher than that of the inverting input end of the second voltage comparator.
9. The protection circuit of claim 7, wherein:
and under the abnormal working condition, the voltage value of the non-inverting input end of the second voltage comparator is lower than that of the inverting input end of the second voltage comparator.
10. The protection circuit of claim 7, wherein:
further comprises: a fifth voltage dividing circuit and a first voltage boosting circuit;
the voltage input end is connected with the fifth voltage dividing circuit through the first voltage boosting circuit, and the output end of the second voltage comparator is connected with the control end of the first transmission device through the fifth voltage dividing circuit.
11. The protection circuit of claim 1, wherein:
the second state monitoring feedback circuit includes: a second thermistor having a negative temperature coefficient;
the second thermistor is used for detecting the temperature of the second transmission device;
the second thermistor is connected with the control end of the first transmission device.
12. The protection circuit of claim 11, wherein:
further comprises: a sixth voltage dividing circuit and a second voltage boosting circuit;
the voltage input end is connected with the sixth voltage dividing circuit through the second voltage boosting circuit, and the second thermistor is connected with the control end of the first transmission device through the sixth voltage dividing circuit.
13. A power supply circuit, comprising: a power supply, a protection circuit according to any one of claims 1-12, and a load circuit;
the power supply is connected with the load circuit through the protection circuit.
14. An automatic pilot vehicle, characterized by:
the power supply circuit according to claim 13 is provided on the automated driving vehicle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310747544.3A CN116742584A (en) | 2023-06-21 | 2023-06-21 | Protection circuit, power supply circuit and automatic driving vehicle based on state detection |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310747544.3A CN116742584A (en) | 2023-06-21 | 2023-06-21 | Protection circuit, power supply circuit and automatic driving vehicle based on state detection |
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| Publication Number | Publication Date |
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| CN116742584A true CN116742584A (en) | 2023-09-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202310747544.3A Pending CN116742584A (en) | 2023-06-21 | 2023-06-21 | Protection circuit, power supply circuit and automatic driving vehicle based on state detection |
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| Country | Link |
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| CN (1) | CN116742584A (en) |
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- 2023-06-21 CN CN202310747544.3A patent/CN116742584A/en active Pending
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