CN115207873A - Power supply protection device for unmanned vehicle and unmanned vehicle - Google Patents

Power supply protection device for unmanned vehicle and unmanned vehicle Download PDF

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Publication number
CN115207873A
CN115207873A CN202210785187.5A CN202210785187A CN115207873A CN 115207873 A CN115207873 A CN 115207873A CN 202210785187 A CN202210785187 A CN 202210785187A CN 115207873 A CN115207873 A CN 115207873A
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signal
signal output
power supply
resistor
signal input
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Inventor
许哲涛
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Beijing Jingdong Qianshi Technology Co Ltd
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Beijing Jingdong Qianshi Technology Co Ltd
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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
    • H02H3/006—Calibration or setting of parameters
    • 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
    • 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
    • H02H3/08—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 responsive to excess current
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00304—Overcurrent protection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Direct Current Feeding And Distribution (AREA)

Abstract

The utility model provides a power supply protection device and unmanned car for unmanned car can be applied to unmanned driving technical field. This a power supply protection device for unmanned vehicle includes: a microcontroller comprising a first signal output configured to connect the load switch and the regulation module, respectively; the regulating module comprises a first signal input end, a second signal input end and a second signal output end, wherein the first signal input end is configured to be connected with a power supply, the second signal input end is configured to be connected with the first signal output end, and the second signal output end is configured to be connected with a load switch; and a load switch configured to be connected with the camera through the filter inductor, wherein the load switch comprises a power input end, a third signal input end and a current limiting control end, the power input end is configured to be connected with a power supply, the third signal input end is configured to be connected with the first signal output end, and the current limiting control end is configured to be connected with the second signal output end.

Description

Power supply protection device for unmanned vehicle and unmanned vehicle
Technical Field
The present disclosure relates to the field of unmanned driving technologies, and more particularly, to a power supply protection device for an unmanned vehicle and an unmanned vehicle.
Background
With the rapid development of the unmanned technology, unmanned vehicles are increasingly applied to various fields such as industrial and agricultural production, logistics, daily life and the like. Among the many components of the unmanned vehicle, the camera is one of the basic components to which the unmanned vehicle is applied. In the related art, the cameras usually use POC (Power Over coax) Power supply, and in order to prevent a short circuit of a certain camera from affecting Power supply of other cameras, overcurrent protection is usually set in a load switch to achieve short-circuit protection.
In implementing the disclosed concept, the inventors found that there are at least the following problems in the related art: the mode of setting a fixed overcurrent protection threshold value in the related art cannot simultaneously guarantee the power-on stability and the safety of the camera.
Disclosure of Invention
In view of this, this disclosure provides a power supply protection device and unmanned car for unmanned car.
One aspect of the present disclosure provides a power supply protection device for an unmanned vehicle, comprising: a microcontroller comprising a first signal output configured to connect to a load switch and a regulation module, respectively; the adjusting module comprises a first signal input end, a second signal input end and a second signal output end, wherein the first signal input end is configured to be connected with a power supply, the second signal input end is configured to be connected with the first signal output end, and the second signal output end is configured to be connected with the load switch; and the load switch configured to be connected to the camera through the filter inductor, the load switch including a power input terminal configured to be connected to the power supply, a third signal input terminal configured to be connected to the first signal output terminal, and a current limit control terminal configured to be connected to the second signal output terminal; the microcontroller is configured to output a first control signal at the first signal output terminal, the adjusting module is configured to adjust an equivalent resistance value of the second signal output terminal in response to the first control signal, and the load switch is configured to switch to an on state in response to the first control signal and determine a current limit value of the power input terminal based on the equivalent resistance value of the current limit control terminal.
According to an embodiment of the present disclosure, the adjusting module includes: a control circuit comprising a fourth signal input configured to be connected to the first signal input, a fifth signal input configured to be connected to the second signal input, and a third signal output configured to be connected to a load regulation circuit, the control circuit configured to output a second control signal at the third signal output; and the load adjusting circuit includes a sixth signal input terminal and a fourth signal output terminal, the sixth signal input terminal is configured to be connected to the third signal output terminal, the fourth signal output terminal is configured to be connected to the second signal output terminal, and the load adjusting circuit is configured to determine an equivalent resistance value of the fourth signal output terminal based on the second control signal.
According to an embodiment of the present disclosure, the control circuit includes: a voltage dividing unit including a first resistor and a second resistor connected in series, wherein one end of the first resistor is configured to be connected to the fourth signal input terminal, one end of the second resistor is configured to be grounded, and a connection end of the first resistor and the second resistor is configured to be connected to the third signal output terminal; a first transistor including a first base, a first collector and a first emitter, the first base being configured to be connected to the fifth signal input terminal, the first collector being configured to be connected to the fourth signal input terminal through a third resistor, the first emitter being configured to be grounded; a second triode comprising a second base, a second collector and a second emitter, wherein the second base is configured to be connected with the first collector, the second collector is configured to be connected with the third signal output end, and the second emitter is configured to be grounded; and a capacitor having one end configured to be connected to the third signal output terminal and the other end configured to be grounded.
According to an embodiment of the present disclosure, the first transistor is configured to be switched to a conducting state in response to the first control signal; the second transistor is configured to switch to an off state in response to the first transistor being turned on; and the capacitor is configured to be charged for a preset time period to output the second control signal in a low level state at the third signal output terminal for the preset time period, and to output the second control signal in a high level state at the third signal output terminal after the preset time period.
According to an embodiment of the present disclosure, the load regulation circuit includes: a field effect transistor including a source, a gate and a drain, the source being configured to be grounded via a fourth resistor, the gate being configured to be connected to the sixth signal input terminal, and the drain being configured to be connected to the fourth signal output terminal; the fourth resistor; and a fifth resistor having one end connected to the fourth signal output terminal and the other end connected to ground.
According to an embodiment of the disclosure, the field effect transistor is configured to switch to an off state in response to the second control signal being in a low level state, so as to adjust the equivalent resistance value of the fourth signal output end to the resistance value of the fifth resistor.
According to an embodiment of the disclosure, the field effect transistor is configured to switch to a conducting state in response to the second control signal being in a high level state, so as to adjust an equivalent resistance value of the fourth signal output terminal to a resistance value of the fourth resistor and the fifth resistor connected in parallel.
According to an embodiment of the present disclosure, the first control signal represents a high level signal.
Another aspect of the present disclosure provides an unmanned vehicle including: the chassis comprises a battery device, a power supply protection device and a power device; and an autopilot kit comprising a camera and a processor; wherein, above-mentioned power supply protection device includes: the microcontroller comprises a first signal output end which is configured to be respectively connected with the load switch and the adjusting module; the adjusting module comprises a first signal input end, a second signal input end and a second signal output end, wherein the first signal input end is configured to be connected with a battery device, the second signal input end is configured to be connected with the first signal output end, and the second signal output end is configured to be connected with the load switch; and the load switch configured to be connected to the camera through a filter inductor, the load switch including a power input terminal, a third signal input terminal and a current limiting control terminal, the power input terminal being configured to be connected to the battery device, the third signal input terminal being configured to be connected to the first signal output terminal, the current limiting control terminal being configured to be connected to the second signal output terminal; the microcontroller is configured to output a first control signal at the first signal output terminal, the adjusting module is configured to adjust an equivalent resistance value of the second signal output terminal in response to the first control signal, and the load switch is configured to switch to an on state in response to the first control signal and determine a current limit value of the power input terminal based on the equivalent resistance value of the current limit control terminal.
According to an embodiment of the present disclosure, the battery device includes a power supply and a power supply management module, wherein the power supply is configured to supply power to the power device through the power supply management module and to the automatic driving kit through the power supply management module and the power supply protection device in sequence; the camera configured to acquire environmental information of the unmanned vehicle and transmit the environmental information to the processor; the processor configured to process the environmental information, generate a motion control signal, and transmit the motion control signal to the power plant; and the power device is configured to respond to the motion control signal to control the unmanned vehicle to move.
According to the embodiment of the disclosure, the power supply protection device is connected in series between the camera of the unmanned vehicle and the power supply, when the microcontroller in the power supply protection device outputs the first control signal, the adjusting module can adjust the equivalent resistance value of the current-limiting control end according to the voltage value of the power supply, so that the load switch can set different current-limiting values according to different equivalent resistance values, and further the self-adaptive adjustment of the current-limiting value of the load switch from the power supply start to the normal operation period of the camera is realized, thereby at least partially overcoming the technical problem that the power-on stability and the safety of the camera cannot be ensured simultaneously by setting a fixed overcurrent protection threshold value in the related art, and effectively improving the overcurrent protection effect of the power supply circuit.
Drawings
The above and other objects, features and advantages of the present disclosure will become more apparent from the following description of embodiments of the present disclosure with reference to the accompanying drawings, in which:
fig. 1A schematically shows a power-up timing diagram of a camera when a small current limit value is set for a load switch.
FIG. 1B schematically shows a power-up timing diagram for a camera when a large current limit value is set for a load switch.
Fig. 2 schematically illustrates a schematic diagram of a power supply protection device for an unmanned vehicle according to an embodiment of the present disclosure.
Fig. 3 schematically illustrates a schematic diagram of a conditioning module according to an embodiment of the disclosure.
Fig. 4 schematically illustrates a schematic diagram of a control circuit according to an embodiment of the disclosure.
Fig. 5 schematically illustrates a schematic diagram of a load regulation circuit according to an embodiment of the present disclosure.
Fig. 6A schematically illustrates a schematic diagram of a power supply protection device for an unmanned vehicle according to another embodiment of the present disclosure.
Fig. 6B schematically illustrates an operation timing diagram of a power supply protection device for an unmanned vehicle according to another embodiment of the present disclosure.
Fig. 7 schematically illustrates a schematic view of an unmanned vehicle according to an embodiment of the disclosure.
Detailed Description
Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. It should be understood that the description is illustrative only and is not intended to limit the scope of the present disclosure. In the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the disclosure. It may be evident, however, that one or more embodiments may be practiced without these specific details. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. The terms "comprises," "comprising," and the like, as used herein, specify the presence of stated features, steps, operations, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, or components.
All terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art unless otherwise defined. It is noted that the terms used herein should be interpreted as having a meaning that is consistent with the context of this specification and should not be interpreted in an idealized or overly formal sense.
Where a convention analogous to "at least one of A, B, and C, etc." is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., "a system having at least one of A, B, and C" would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.). Where a convention analogous to "at least one of A, B, or C, etc." is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., "a system having at least one of A, B, or C" would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.).
In the related art, the unmanned vehicle has multiple cameras, and in order to increase transmission bandwidth and reduce wiring harness in the vehicle, a GMSL (Gigabit Multimedia Serial Link) is usually used to implement power supply and communication between the camera and the processor, that is, a POC power supply is used to supply power to the camera, camera data output in parallel in the camera is converted into Serial data by a serializer, and the Serial data can be recovered into parallel data by a deserializer at a receiving end. In order to prevent the influence of the short circuit of a certain camera on the power supply of other cameras, a load switch is usually connected between the camera and a power supply to realize short-circuit protection.
The load switch usually implements short-circuit protection by setting a current limit value, that is, when the input current is greater than the current limit value, the load switch starts current limiting to control the current of the power supply loop of the power supply to the load switch.
Fig. 1A schematically shows a power-up timing diagram of a camera when a small current limit value is set for a load switch.
As shown in fig. 1A, the normal operating current of the camera is typically small, for example, 200mA, and the small current limit value may be a current value slightly larger than the normal operating current, for example, 300mA. However, since there is usually a capacitor in the power supply loop of the camera, the instant of powering on the camera inevitably generates a surge current, which is usually much larger than the normal operating current of the camera, for example, 500mA. At time t1, the load switch enters the current limiting mode because the surge current is greater than the smaller current limiting value, and the input voltage of the camera stops climbing. And gradually reducing the surge current along with the time, and reducing the surge current to be below the smaller current limiting value until the time t2, switching the load on from the current limiting mode to the normal working mode, and climbing the input voltage of the camera again. Since the magnitude of the inrush current has a large uncertainty, the length of the period between time t1 and time t2 is difficult to determine, which may cause a probability of a failed start-up of the camera.
FIG. 1B schematically shows a power-up timing diagram for a camera when a large current limit value is set for a load switch.
As shown in fig. 1B, the larger current limiting value may be a current value larger than the inrush current, such as 600mA, for example, still taking the normal operating current of the camera as 200mA and the inrush current as 500mA as an example. When the current limit value of the load switch is set to 600mA, surge current generated by electrifying the camera cannot be judged as large current generated by short circuit of the camera, and therefore the voltage of the camera can rise stably after the camera is electrified. However, a large current limiting value cannot provide the best protection for the camera power supply, and when multiple camera loops are short-circuited, a large current generated by the short-circuiting of the multiple camera loops may not trigger overcurrent protection, which may cause overload of the camera power supply, thereby affecting the stability of other camera power supply loops.
In view of this, an embodiment of the present disclosure provides a power supply protection device for an unmanned vehicle, which can implement adaptive switching of a current limit value of a load switch during camera power-on and normal operation, so that when the camera is powered on, the current limit value of the load switch can be switched to a larger current limit value to facilitate successful power-on operation of the camera, and after the camera normally operates, the current limit value of the load switch can be switched to a smaller current limit value to facilitate overcurrent protection of a camera power supply loop.
Specifically, this a power supply protection device for unmanned car includes: the microcontroller comprises a first signal output end which is configured to be respectively connected with the load switch and the adjusting module; the adjusting module comprises a first signal input end, a second signal input end and a second signal output end, the first signal input end is configured to be connected with a power supply, the second signal input end is configured to be connected with the first signal output end, and the second signal output end is configured to be connected with a load switch; and a load switch configured to be connected to the camera through the filter inductor, the load switch including a power input terminal configured to be connected to a power supply, a third signal input terminal configured to be connected to the first signal output terminal, and a current limit control terminal configured to be connected to the second signal output terminal; the microcontroller is configured to output a first control signal at the first signal output end, the adjusting module is configured to adjust an equivalent resistance value of the second signal output end in response to the first control signal, the load switch is configured to be switched to an on state in response to the first control signal, and the current limiting value of the power input end is determined based on the equivalent resistance value of the current limiting control end.
Fig. 2 schematically illustrates a schematic diagram of a power supply protection device for an unmanned vehicle according to an embodiment of the present disclosure.
As shown in fig. 2, the power protection apparatus for an unmanned vehicle may include a microcontroller 100, a regulation module 200, and a load switch 300. The device is connected in series between the power supply 400 and the camera 500.
According to an embodiment of the present disclosure, the microcontroller 100 may include a first signal output terminal Sout1, the first signal output terminal Sout1 being configured to be connected to the load switch 300 and the regulating module 200, respectively.
According to an embodiment of the present disclosure, the adjusting module 200 may include a first signal input terminal Sin1, a second signal input terminal Sin2, and a second signal output terminal Sout2, the first signal input terminal Sin1 is configured to be connected to the power supply 400, the second signal input terminal Sin2 is configured to be connected to the first signal output terminal Sout1, and the second signal output terminal Sout2 is configured to be connected to the load switch 300.
According to an embodiment of the present disclosure, the load switch 300 is configured to be connected to the camera 500 through the filter inductor L, and the load switch 300 may include a power input terminal Pin configured to be connected to the power supply 400, a third signal input terminal Sin3 configured to be connected to the first signal output terminal Sout1, and a current limiting control terminal ISET configured to be connected to the second signal output terminal Sout2.
According to an embodiment of the present disclosure, the microcontroller 100 may be implemented by a programmable chip, a Field Programmable Gate Array (FPGA), a Programmable Logic Array (PLA), an Application Specific Integrated Circuit (ASIC), etc., without being limited thereto.
The type of the load switch 300 is not limited herein according to the embodiment of the present disclosure. The current limit value of the load switch 300 may be related to the equivalent resistance value of the current limit control end ISET, and taking the load switch 300 as MAX20087ATPA as an example, the relationship between the current limit value and the equivalent resistance value of the current limit control end may be as shown in formula (1):
Figure BDA0003715695240000081
in the formula I lim Denotes the restriction value, R ISET And the equivalent resistance value of the current limiting control end is shown.
According to an embodiment of the present disclosure, upon powering up the camera, the microcontroller 100 may be configured to output a first control signal at a first signal output. The adjusting module 200 may be configured to adjust an equivalent resistance value of the second signal output terminal Sout2 in response to the first control signal. The load switch 300 may be configured to switch to an on state in response to the first control signal, and determine a current limit value of the power input terminal Pin based on an equivalent resistance value of the current limit control terminal ISET.
According to an embodiment of the present disclosure, the first control signal may be used to control the turning on of the load switch 300.
According to an embodiment of the present disclosure, the equivalent resistance value of the second signal output terminal Sout2 may be equal to the equivalent resistance value of the current limiting control terminal ISET.
According to the embodiment of the disclosure, the power supply protection device is connected in series between the camera of the unmanned vehicle and the power supply, when the microcontroller in the power supply protection device outputs the first control signal, the adjusting module can adjust the equivalent resistance value of the current-limiting control end according to the voltage value of the power supply, so that the load switch can set different current-limiting values according to different equivalent resistance values, and further the self-adaptive adjustment of the current-limiting value of the load switch from the power supply starting to the normal operation of the camera is realized, the technical problem that the power-on stability and the safety of the camera cannot be ensured simultaneously in a mode of setting a fixed overcurrent protection threshold value in the related technology is at least partially overcome, and the overcurrent protection effect of the power supply circuit is effectively improved.
The apparatus shown in fig. 2 is further described with reference to fig. 3-5, 6A, and 6B in conjunction with specific embodiments.
According to an embodiment of the present disclosure, the first control signal may characterize a high level signal.
Fig. 3 schematically illustrates a schematic diagram of a conditioning module according to an embodiment of the disclosure.
As shown in fig. 3, the regulation module 200 may include a control circuit 210 and a load regulation circuit 220.
According to an embodiment of the present disclosure, the control circuit 210 may include a fourth signal input terminal Sin4, a fifth signal input terminal Sin5 and a third signal output terminal Sout3, the fourth signal input terminal Sin4 is configured to be connected to the first signal input terminal Sin1, the fifth signal input terminal Sin5 is configured to be connected to the second signal input terminal Sin2, and the third signal output terminal Sout1 is configured to be connected to the load adjusting circuit 210.
According to an embodiment of the present disclosure, the load regulation circuit 220 may include a sixth signal input terminal Sin6 and a fourth signal output terminal Sout4, the sixth signal input terminal Sin6 is configured to be connected to the third signal output terminal Sout3, and the fourth signal output terminal Sout4 is configured to be connected to the second signal output terminal Sout2.
According to an embodiment of the present disclosure, the control circuit 210 may be configured to output the second control signal at the third signal output terminal Sout3. The load regulation circuit 220 may be configured to determine an equivalent resistance value of the fourth signal output terminal Sout4 based on the second control signal.
Fig. 4 schematically illustrates a schematic diagram of a control circuit according to an embodiment of the disclosure.
As shown in fig. 4, the control circuit 210 may include a voltage division unit 211, a first transistor 212, a second transistor 213, and a capacitor 214.
According to an embodiment of the present disclosure, the voltage dividing unit 211 may include a first resistor R1 and a second resistor R2 connected in series, one end of the first resistor R1 is configured to be connected to the fourth signal input terminal Sin4, one end of the second resistor R2 is configured to be grounded, and a connection end of the first resistor R1 and the second resistor R2 is configured to be connected to the third signal output terminal Sout3.
According to an embodiment of the present disclosure, the first transistor 212 may include a first base B1, a first collector C1, and a first emitter E1, the first base B1 is configured to be connected to the fifth signal input terminal Sin5, the first collector C1 is configured to be connected to the fourth signal input terminal Sin4 through a third resistor R3, and the first emitter E1 is configured to be grounded.
According to an embodiment of the present disclosure, the second triode 213 may include a second base B2, a second collector C2 and a second emitter E2, the second base B2 is configured to be connected to the first collector C1, the second collector C2 is configured to be connected to the third signal output terminal Sout3, and the second emitter is configured to be grounded.
According to the embodiment of the present disclosure, one end of the capacitor 214 is configured to be connected to the third signal output terminal Sout3, and the other end is configured to be grounded.
According to the embodiment of the present disclosure, the first resistor R1, the second resistor R2, and the third resistor R3 may be a single resistor, or may be a resistor group formed by connecting a plurality of resistors in series or in parallel, and are not limited herein.
According to the embodiment of the present disclosure, the first resistor R1, the second resistor R2, and the third resistor R3 may be any type of fixed resistor, and may be, for example, a chip resistor, a carbon film resistor, a metal film resistor, a wire-wound resistor, or the like.
According to an embodiment of the present disclosure, the first transistor 212 and the second transistor 213 may be any type of NPN-type transistor.
According to the embodiment of the present disclosure, the capacitor 214 may be any type of capacitor, such as a dacron capacitor, a ceramic capacitor, a mica capacitor, an electrolytic capacitor, a tantalum capacitor, etc.
According to an embodiment of the present disclosure, when the power supply 400 is not supplying power, the fourth signal input terminal Sin4 may receive a low level signal, and the third signal output terminal Sout3 may output a low level signal.
According to the embodiment of the present disclosure, when the power supply 400 starts to supply power, the fourth signal input terminal Sin4 may receive a high level signal, and the fifth signal input terminal Sin5 may receive the first control signal sent by the microcontroller 100. When the first control signal is a low level signal, the first transistor 212 is in a cut-off state, the second transistor 213 can be switched to a conducting state due to the on condition being satisfied, the conducting of the second transistor 213 can make the third signal output terminal Sout3 equivalent to ground, and the third signal output terminal Sout3 can output a low level signal. When the first control signal is a high level signal, the first transistor 212 may be configured to switch to a conducting state in response to the first control signal, at this time, the second base B2 of the second transistor 213 is equivalent to ground, the second transistor 213 may be configured to switch to a blocking state in response to the first transistor 212 being turned on, and the power supply 400 may charge the capacitor 214 through the voltage dividing unit 211, that is, the capacitor 214 is configured to be charged within a preset time period.
According to the embodiment of the present disclosure, the time required for the power supply 400 to charge the capacitor 214 through the voltage dividing unit 211, that is, the preset time period, may be calculated by equation (2):
Figure BDA0003715695240000111
in the formula, t represents a preset time period; v in Represents the output voltage of the power supply 400; r 1 Represents the resistance value of the first resistor R1; r 2 Represents the resistance value of the second resistor R2; c represents the capacitance of the capacitor 214.
According to an embodiment of the present disclosure, the level of the second control signal output by the third signal output terminal Sout3 may gradually increase within a preset time period until after the preset time period, the level of the second control signal satisfies a condition of a high level state required by the third signal output terminal Sout3, and the third signal output terminal Sout3 outputs the second control signal in the high level state.
In some embodiments, the preset period may refer to only a period from power-up to a time when the level of the second control signal satisfies a condition of a high state required by the third signal output terminal Sout3, and the preset period may be less than a time required by the power supply 400 to charge the capacitor 214 through the voltage dividing unit 211.
Fig. 5 schematically illustrates a schematic diagram of a load regulation circuit according to an embodiment of the present disclosure.
As shown in fig. 5, the load regulation circuit 220 may include a field effect transistor 221, a fourth resistor R4, and a fifth resistor R5.
According to an embodiment of the present disclosure, the field effect transistor 221 may include a source S, a gate G, and a drain D, the source S is configured to be grounded through the fourth resistor R4, the gate G is configured to be connected to the sixth signal input terminal Sin6, and the drain G is configured to be connected to the fourth signal output terminal Sout4.
According to the embodiment of the present disclosure, one end of the fifth resistor R5 is configured to be connected to the fourth signal output terminal Sout4, and the other end is configured to be grounded.
According to embodiments of the present disclosure, fet 221 may be any type of N-channel enhancement mode fet.
According to the embodiment of the present disclosure, the second resistor R4 and the third resistor R5 may be a single resistor, or may be a resistor group formed by connecting a plurality of resistors in series or in parallel, and is not limited herein.
According to the embodiment of the present disclosure, the second resistor R4 and the third resistor R5 may be any type of fixed resistor, and may be, for example, a chip resistor, a carbon film resistor, a metal film resistor, a wire-wound resistor, or the like.
According to the embodiment of the present disclosure, in the case that the second control signal received by the sixth input terminal Sin6 does not satisfy the on condition of the fet 221, that is, the second control signal is a low level signal, the fet 221 is in the off state. That is, the fet 221 is configured to switch to the off state in response to the second control signal being in the low state. At this time, the fourth signal output terminal Sout4 may be regarded as being connected in series with only the fifth resistor R5, that is, the load adjusting circuit 220 may be configured to adjust the equivalent resistance value of the fourth signal output terminal Sout4 to the resistance value of the fifth resistor R5.
According to the embodiment of the present disclosure, in the case that the second control signal received by the sixth input terminal Sin6 satisfies the conducting condition of the fet 221, that is, the second control signal is a high level signal, the fet 221 switches to the conducting state. That is, the fet 221 is configured to switch to the on state in response to the second control signal being in the high state. At this time, the fourth signal output terminal Sout4 may be regarded as being connected in parallel with the fourth resistor R4 and the fifth resistor R5, that is, the load adjusting circuit 220 may be configured to adjust the equivalent resistance value of the fourth signal output terminal Sout4 to the resistance value of the fourth resistor R4 connected in parallel with the fifth resistor R5.
Fig. 6A schematically illustrates a schematic diagram of a power supply protection device for an unmanned vehicle according to another embodiment of the present disclosure.
As shown in fig. 6A, the camera 500 may include a power conversion module 510, a camera component 520, and a serializer 530.
According to an embodiment of the present disclosure, the parallel signal output by the camera component 520 may be converted into a serial signal by the serializer 530; the serial signal may be input to the deserializer 600 through two ac coupling capacitors, such as C1 and C2, at the camera end and the receiving end; the deserializer 600 may convert the serial signal into an MIPI (Mobile Industry Processor Interface) signal and send the MIPI signal to the Processor 700.
According to an embodiment of the present disclosure, power input from the power supply 400 may be applied to the coaxial cable via the load switch 300 and a filter inductor, such as L1. On the camera side, the power conversion module 510 may convert the power on the coaxial cable to the operating voltages of the camera component 520 and the serializer 530.
Fig. 6B schematically illustrates an operation timing diagram of a power supply protection device for an unmanned vehicle according to another embodiment of the present disclosure.
As shown in fig. 6B, at the time t0 to the time t1, the microcontroller 100 outputs a low level signal at the first signal output terminal Sout1, the load switch 300 is in the off state, the first transistor 212 is in the off state, the first collector C1 is in the high level, the second transistor 213 is in the on state, the second collector C2 is in the low level, the fet 221 is in the off state, and the equivalent resistance value of the current limiting control terminal ISET of the load switch is R ISET ＝R 5 . Taking the resistance value of the fifth resistor R5 as 100k Ω as an example, according to the formula (1), the current limiting value set by the current limiting control terminal ISET is 600mA.
At time t1, the microcontroller 100 starts to output a high level signal at the first signal output terminal Sout1, the load switch 300 enters a working state, the first transistor 212 is turned on, the first collector C1 is at a low level, the second transistor 213 is turned off, and the power supply 400 charges the capacitor 214 through the first resistor R1. At this time, the fet 221 is in an off state, and the equivalent resistance value of the current limiting control terminal ISET of the load switch is R ISET ＝R 5 。
At time t2, the voltage across the capacitor 214 satisfies the conduction condition of the fet 221, the fet 221 enters the conduction state, and the equivalent resistance value of the current-limiting control terminal ISET of the load switch is R ISET ＝R 4 ×R 5 /(R 4 +R 5 ). Taking the resistance values of the fourth resistor R4 and the fifth resistor R5 as 100k Ω, the equivalent resistance value R of the current limiting control end ISET of the load switch is taken as an example ISET To 50k omega, respectively, according to the disclosureAs can be seen from equation (1), the current limit value set by the current limit control terminal ISET is changed to 300mA.
At time t3, the capacitor 214 is charged, the fet 221 remains in the on state, and the equivalent resistance R of the current limiting control terminal ISET of the load switch is maintained ISET Again without change.
According to the embodiment of the disclosure, the current limiting value can be adaptively adjusted through the power supply protection device, so that the overcurrent protection circuit of the camera has an optimal effect, a larger current limiting value is selected to ensure starting current during power-on, and the current limiting value is switched to a smaller current limiting value after the power-on is completed, so that the current limiting effect is optimal.
Fig. 7 schematically illustrates a schematic view of an unmanned vehicle according to an embodiment of the disclosure.
As shown in fig. 7, the drone vehicle may include a chassis and an autopilot kit.
According to an embodiment of the present disclosure, the chassis may include a battery device, a power supply protection device, and a power device 800.
According to an embodiment of the present disclosure, an autopilot kit may include a camera 500 and a processor 700.
According to an embodiment of the present disclosure, a power supply protection device includes: the microcontroller 100 includes a first signal output terminal Sout1, the first signal output terminal Sout1 is configured to be connected to the load switch 300 and the regulating module 200 respectively; a regulating module 200 including a first signal input terminal Sin1, a second signal input terminal Sin2 and a second signal output terminal Sout2, the first signal input terminal Sin1 being configured to be connected to the battery device, the second signal input terminal Sin2 being configured to be connected to the first signal output terminal Sout1, the second signal output terminal Sout2 being configured to be connected to the load switch 300; the load switch 300 is configured to be connected to the camera 500 through a filter inductor, the load switch 300 includes a power input terminal Pin, a third signal input terminal Sin3 and a current limiting control terminal ISET, the power input terminal Pin is configured to be connected to the battery device, the third signal input terminal Sin3 is configured to be connected to the first signal output terminal Sout1, and the current limiting control terminal ISET is configured to be connected to the second signal output terminal Sout2.
According to the embodiment of the present disclosure, the microcontroller 100 is configured to output a first control signal at a first signal output terminal, the adjusting module 200 is configured to adjust an equivalent resistance value of the second signal output terminal Sout2 in response to the first control signal, the load switch 300 is configured to switch to an on state in response to the first control signal, and determine a current limit value of the power input terminal Pin based on the equivalent resistance value of the current limit control terminal ISET.
According to the embodiment of the disclosure, the current limiting value can be adaptively adjusted through the power supply protection device, so that the overcurrent protection circuit of the camera has an optimal effect, a larger current limiting value is selected to ensure starting current during power-on, and the current limiting value is switched to a smaller current limiting value after the power-on is completed, so that the current limiting effect is optimal.
According to an embodiment of the present disclosure, the battery device may include a power supply 400 and a power management module, the power supply 400 being configured to supply power to the power device through the power management module and, in turn, to the autopilot kit through the power management module and the power protection device.
According to an embodiment of the present disclosure, the camera 500 may be configured to acquire environment information of the unmanned vehicle and transmit the environment information to the processor 700.
According to an embodiment of the present disclosure, the processor 700 may be configured to process the environmental information, generate a motion control signal, and transmit the motion control signal to the power plant.
According to embodiments of the present disclosure, the power plant may be configured to control the unmanned vehicle to move in response to a motion control signal.
It should be noted that the power supply protection device portion in the embodiment of the present disclosure corresponds to the power supply protection device portion for the unmanned vehicle in the embodiment of the present disclosure, and the description of the power supply protection device portion specifically refers to the power supply protection device portion for the unmanned vehicle, and is not described herein again.
Those skilled in the art will appreciate that various combinations and/or combinations of features recited in the various embodiments and/or claims of the present disclosure can be made, even if such combinations or combinations are not expressly recited in the present disclosure. In particular, various combinations and/or combinations of the features recited in the various embodiments of the present disclosure and/or the claims may be made without departing from the spirit and teachings of the present disclosure. All such combinations and/or associations are within the scope of the present disclosure.
The embodiments of the present disclosure are described above. However, these examples are for illustrative purposes only and are not intended to limit the scope of the present disclosure. Although the embodiments are described separately above, this does not mean that the measures in the embodiments cannot be used in advantageous combination. The scope of the disclosure is defined by the appended claims and equivalents thereof. Various alternatives and modifications can be devised by those skilled in the art without departing from the scope of the present disclosure, and such alternatives and modifications are intended to be within the scope of the present disclosure.

Claims (10)

1. A power supply protection device for an unmanned vehicle, comprising:
a microcontroller comprising a first signal output configured to connect to a load switch and a regulation module, respectively;
the adjusting module comprises a first signal input end, a second signal input end and a second signal output end, the first signal input end is configured to be connected with a power supply, the second signal input end is configured to be connected with the first signal output end, and the second signal output end is configured to be connected with the load switch; and
the load switch is configured to be connected with the camera through a filter inductor, and comprises a power input end, a third signal input end and a current-limiting control end, wherein the power input end is configured to be connected with the power supply, the third signal input end is configured to be connected with the first signal output end, and the current-limiting control end is configured to be connected with the second signal output end;
wherein the microcontroller is configured to output a first control signal at the first signal output terminal, the adjusting module is configured to adjust an equivalent resistance value of the second signal output terminal in response to the first control signal, and the load switch is configured to switch to an on state in response to the first control signal and determine a current limit value of the power input terminal based on the equivalent resistance value of the current limit control terminal.
2. The apparatus of claim 1, wherein the adjustment module comprises:
a control circuit comprising a fourth signal input configured to be connected to the first signal input, a fifth signal input configured to be connected to the second signal input, and a third signal output configured to be connected to a load regulation circuit, the control circuit configured to output a second control signal at the third signal output; and
the load regulation circuit comprises a sixth signal input terminal and a fourth signal output terminal, the sixth signal input terminal is configured to be connected with the third signal output terminal, the fourth signal output terminal is configured to be connected with the second signal output terminal, and the load regulation circuit is configured to determine an equivalent resistance value of the fourth signal output terminal based on the second control signal.
3. The apparatus of claim 2, wherein the control circuit comprises:
a voltage dividing unit including a first resistor and a second resistor connected in series, wherein one end of the first resistor is configured to be connected to the fourth signal input terminal, one end of the second resistor is configured to be grounded, and a connection end of the first resistor and the second resistor is configured to be connected to the third signal output terminal;
a first transistor comprising a first base, a first collector, and a first emitter, the first base configured to be connected to the fifth signal input, the first collector configured to be connected to the fourth signal input through a third resistor, the first emitter configured to be grounded;
a second triode comprising a second base, a second collector and a second emitter, wherein the second base is configured to be connected with the first collector, the second collector is configured to be connected with the third signal output end, and the second emitter is configured to be grounded; and
a capacitor having one end configured to be connected to the third signal output terminal and the other end configured to be grounded.
4. The apparatus of claim 3, wherein,
the first transistor is configured to switch to a conductive state in response to the first control signal;
the second transistor is configured to switch to an off state in response to the first transistor being turned on; and
the capacitor is configured to be charged for a preset period of time to output the second control signal in a low level state at the third signal output terminal for the preset period of time, and to output the second control signal in a high level state at the third signal output terminal after the preset period of time.
5. The apparatus of claim 2, wherein the load regulation circuit comprises:
a field effect transistor comprising a source, a gate and a drain, the source configured to be grounded through a fourth resistor, the gate configured to be connected to the sixth signal input terminal, the drain configured to be connected to the fourth signal output terminal;
the fourth resistor; and
a fifth resistor having one end configured to be connected to the fourth signal output terminal and the other end configured to be grounded.
6. The apparatus of claim 5, wherein the FET is configured to switch to an off state in response to the second control signal being in a low state to adjust an equivalent resistance value of the fourth signal output to a resistance value of the fifth resistor.
7. The apparatus of claim 5, wherein the FET is configured to switch to a conducting state in response to the second control signal being in a high state to adjust an equivalent resistance value of the fourth signal output to a parallel resistance value of the fourth resistor and the fifth resistor.
8. The apparatus of any of claims 1-7, wherein the first control signal is representative of a high level signal.
9. An unmanned vehicle comprising:
the chassis comprises a battery device, a power supply protection device and a power device; and
an autopilot kit comprising a camera and a processor;
wherein, the power supply protection device includes:
a microcontroller comprising a first signal output configured to connect to a load switch and a regulation module, respectively;
the adjusting module comprises a first signal input end, a second signal input end and a second signal output end, the first signal input end is configured to be connected with a battery device, the second signal input end is configured to be connected with the first signal output end, and the second signal output end is configured to be connected with the load switch; and
the load switch is configured to be connected with the camera through a filter inductor, and comprises a power input end, a third signal input end and a current limiting control end, wherein the power input end is configured to be connected with the battery device, the third signal input end is configured to be connected with the first signal output end, and the current limiting control end is configured to be connected with the second signal output end;
wherein the microcontroller is configured to output a first control signal at the first signal output terminal, the adjusting module is configured to adjust the equivalent resistance value of the second signal output terminal in response to the first control signal, the load switch is configured to switch to an on state in response to the first control signal, and the current limit value of the power input terminal is determined based on the equivalent resistance value of the current limit control terminal.
10. The unmanned vehicle of claim 9,
the battery device comprises a power supply and a power supply management module, wherein the power supply is configured to supply power to the power device through the power supply management module and the power supply protection device to the automatic driving suite in sequence;
the camera configured to acquire environmental information of the unmanned vehicle and transmit the environmental information to the processor;
the processor configured to process the environmental information, generate a motion control signal, and send the motion control signal to the power plant; and
the power plant configured to control the unmanned vehicle to move in response to the motion control signal.
CN202210785187.5A 2022-06-27 2022-06-27 Power supply protection device for unmanned vehicle and unmanned vehicle Pending CN115207873A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117724571A (en) * 2023-12-08 2024-03-19 宁波捷课教育科技有限公司 Power control system based on current limiting detection of vehicle-mounted power supply

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117724571A (en) * 2023-12-08 2024-03-19 宁波捷课教育科技有限公司 Power control system based on current limiting detection of vehicle-mounted power supply

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