CN218986363U - Electric vehicle starting circuit and electric vehicle - Google Patents
Electric vehicle starting circuit and electric vehicle Download PDFInfo
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- CN218986363U CN218986363U CN202223373260.2U CN202223373260U CN218986363U CN 218986363 U CN218986363 U CN 218986363U CN 202223373260 U CN202223373260 U CN 202223373260U CN 218986363 U CN218986363 U CN 218986363U
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Abstract
The utility model belongs to the field of electric vehicles, and provides an electric vehicle starting circuit and an electric vehicle, wherein the electric vehicle starting circuit comprises: the undervoltage protection circuit, the first switching device, the second switching device and the third switching device; the first switching device is connected in series in a power supply loop and a charging loop of the low-voltage storage battery; the first switch device is used for controlling the ON-off of the power supply loop and the charging loop when the key switch is in an ON gear; the second switch device is used for being closed when the key switch is turned ON to the ON gear and automatically opened after a preset time period is reached; the under-voltage protection circuit is used for controlling the third switching device to be closed or opened according to the output voltage; the third switching device is connected in parallel with the second switching device, and the first switching device is closed when the key switch is in an ON gear and the second switching device and/or the third switching device is closed. The utility model effectively improves the service life of the low-voltage storage battery and ensures that the electric vehicle can be normally started under the under-voltage protection state.
Description
Technical Field
The utility model relates to the technical field of electric vehicles, in particular to an electric vehicle starting circuit and an electric vehicle.
Background
At present, when the vehicle is not at high voltage, the low-voltage storage battery of the electric vehicle starts an air conditioner, or the electric vehicle is not used for a long time, so that the low-voltage storage battery is easily fed, and the electric vehicle cannot be started. Meanwhile, the overdischarge of the electric vehicle during the feeding process affects the service life of the low-voltage storage battery.
In order to improve the service life of the low-voltage storage battery, an undervoltage protection circuit is generally adopted in the prior art to prevent the low-voltage storage battery from overdischarge. However, if the electric vehicle is in the under-voltage protection state, the main circuit cannot be turned on during restarting of the electric vehicle, so that the low-voltage storage battery cannot supply power, and the electric vehicle cannot be started normally.
Disclosure of Invention
In view of the foregoing problems in the prior art, the present utility model provides an electric vehicle starting circuit and an electric vehicle.
The utility model provides an electric vehicle starting circuit, comprising: the undervoltage protection circuit, the first switching device, the second switching device and the third switching device;
the first switching device is connected in series in a power supply loop of a low-voltage storage battery of the electric vehicle and a charging loop of the low-voltage storage battery, and the power supply loop and the charging loop further comprise a key switch of the electric vehicle; the first switch device is used for controlling the ON-off of the power supply loop and the charging loop when the key switch is in an ON gear;
the low-voltage storage battery, the key switch, the second switching device and the first switching device are sequentially connected in series to form a starting control loop; the second switch device is used for being closed when the key switch is turned ON to the ON gear and automatically opened after a preset time period is reached;
the under-voltage protection circuit is used for collecting the output voltage of the low-voltage storage battery and controlling the third switching device to be turned on or turned off according to the output voltage;
the third switching device is connected in parallel with the second switching device, and the first switching device is closed when the key switch is in an ON gear, and the second switching device and/or the third switching device is closed.
According to the electric vehicle starting circuit provided by the utility model, the under-voltage protection circuit comprises a voltage acquisition device and a voltage comparison device which are sequentially connected;
the voltage acquisition device is used for acquiring the output voltage;
the input end of the voltage comparison device is connected with the output end of the voltage acquisition device, and the output end of the voltage comparison device is connected with the third switching device and is used for comparing the output voltage with a preset voltage value and outputting a level signal to the third switching device.
According to the electric vehicle starting circuit provided by the utility model, the third switching device adopts a relay switch;
the third switching device comprises a third coil, a third normally-open contact and a third normally-closed contact; the third coil is connected with the output end of the voltage comparison device; the third normally open contact and the third normally closed contact are connected in the start control loop.
According to the electric vehicle starting circuit provided by the utility model, the first switching device adopts a relay switch;
the first switching device comprises a first coil, a first normally-open contact and a first normally-closed contact; the first coil is connected in series in the starting control loop, and the first normally open contact and the first normally closed contact are connected in the power supply loop and the charging loop.
According to the electric vehicle starting circuit provided by the utility model, the second switching device adopts a delay relay switch;
the second switching device comprises a second coil, a second normally-open contact and a second normally-closed contact; the first end of the second coil is connected with the positive electrode of the low-voltage storage battery through the key switch, and the second end of the second coil is connected with the negative electrode of the low-voltage storage battery; the second normally open contact and the second normally closed contact are connected in the start control loop.
According to the electric vehicle starting circuit provided by the utility model, the charging loop comprises the charging component of the low-voltage storage battery.
According to the electric vehicle starting circuit provided by the utility model, the charging assembly comprises a DCDC converter and a power battery;
the DCDC converter is connected in series in the charging loop, and the power battery is connected with the DCDC converter.
According to the electric vehicle starting circuit provided by the utility model, the power supply loop and the charging loop are also provided with safety protection devices.
According to the electric vehicle starting circuit provided by the utility model, the safety protection device is a fuse.
The present utility model also provides an electric vehicle including: the electric vehicle start-up circuit according to any one of the above.
According to the electric vehicle starting circuit and the electric vehicle, the first switching device is connected in series in the power supply loop and the charging loop of the low-voltage storage battery of the electric vehicle, the second switching device and the first switching device are connected in series in the starting control loop, the third switching device is connected with the second switching device in parallel, and the third switching device is controlled to be closed and opened through the under-voltage protection circuit, so that when the electric vehicle is in an under-voltage state, the low-voltage storage battery can be effectively fed and protected, and the service life of the low-voltage storage battery is effectively prolonged; the second switching device is closed when the key switch is turned ON, so that when the electric vehicle is in an under-voltage protection state, the electric vehicle can be automatically charged for the low-voltage storage battery in the starting process, the voltage of the electric vehicle is instantaneously raised, the third switching device is closed, and meanwhile, the second switching device is automatically opened after reaching a preset time length, so that the electric vehicle can be normally started in the under-voltage protection state.
Drawings
In order to more clearly illustrate the utility model or the technical solutions of the prior art, the following brief description will be given of the drawings used in the embodiments or the description of the prior art, it being obvious that the drawings in the following description are some embodiments of the utility model and that other drawings can be obtained from them without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an electric vehicle start circuit according to one embodiment of the present utility model;
FIG. 2 is a second schematic diagram of the starting circuit of the electric vehicle according to the present utility model;
FIG. 3 is a third schematic diagram of the starting circuit of the electric vehicle according to the present utility model;
FIG. 4 is a schematic diagram of a starting circuit of an electric vehicle according to the present utility model;
fig. 5 is a schematic diagram of a structure of an electric vehicle starting circuit according to the present utility model.
Reference numerals:
101: an undervoltage protection circuit; 102: a first switching device; 103: a second switching device; 104: a third switching device; 105: a low voltage battery; 106: a key switch; 107: an electric device; 108: a charging assembly; 201: a voltage acquisition device; 202: a voltage comparing device; 301: a first coil; 302: a first normally open contact; 303: a first normally closed contact; 304: a second coil; 305: a second normally open contact; 306: a second normally closed contact; 307: a third coil; 308: a third normally open contact; 309: a third normally closed contact; 401: a DCDC converter; 402: a power battery; 501: a safety protection device.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present utility model more apparent, the technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
The electric vehicle start-up circuit of the present utility model is described below with reference to fig. 1-5. As shown in fig. 1, the electric vehicle start circuit of the present utility model includes at least: an under-voltage protection circuit 101, a first switching device 102, a second switching device 103, and a third switching device 104;
the first switching device 102 is connected in series in a power supply circuit of a low-voltage storage battery 105 of the electric vehicle and a charging circuit of the low-voltage storage battery 105, and the power supply circuit and the charging circuit further comprise a key switch 106 of the electric vehicle; the first switch device 102 is used for controlling the ON-off of the power supply loop and the charging loop when the key switch 106 is in an ON gear;
the low-voltage storage battery 105, the key switch 106, the second switch device 103 and the first switch device 102 are sequentially connected in series to form a starting control loop; the second switch device 103 is used for being closed when the key switch 106 is turned ON and automatically opened after a preset time period is reached;
the under-voltage protection circuit 101 is configured to collect an output voltage of the low-voltage battery 105, and control the third switching device 104 to be turned on or turned off according to the output voltage;
the third switching device 104 is connected in parallel with the second switching device 103, the first switching device 102 being closed when the key switch 106 is in the ON-position and the second switching device 103 and/or the third switching device 104 are closed.
In the present embodiment, the electric vehicle is a new energy vehicle, that is, a vehicle in which the low-voltage storage battery 105 and the power battery are present. The low-voltage battery 105 may be a 24V battery, or may be set according to actual requirements of an electric vehicle, and may be one battery or may be a series connection of a plurality of batteries.
The power supply circuit of the low-voltage storage battery 105 is used for supplying power to corresponding electric equipment 107 in the electric vehicle, the first switching device 102 is connected in series in the power supply circuit of the low-voltage storage battery 105 of the electric vehicle, the power supply circuit of the low-voltage storage battery 105 can comprise the low-voltage storage battery 105, the key switch 106, the first switching device 102 and the electric equipment 107 which are sequentially connected in series, and when the key switch 106 is in an ON gear, namely, the key switch 106 is closed, the ON and off of the power supply circuit of the low-voltage storage battery 105 is controlled through the ON and off of the first switching device 102.
The charging circuit of the low-voltage battery 105 is used for supplying power to the low-voltage battery 105, the first switching device 102 is further connected in series in the charging circuit of the low-voltage battery 105, and the charging circuit of the low-voltage battery 105 may include the low-voltage battery 105, the key switch 106, the first switching device 102 and the charging component 108 sequentially connected in series, and the charging component 108 may be a component for charging the low-voltage battery 105 in an electric vehicle, for example, may include a Direct Current-Direct Current (DCDC) converter and a power battery. When the key switch 106 is in the ON range, that is, when the key switch 106 is closed, the charging circuit of the low-voltage battery 105 is controlled to be turned ON and off by the ON and off of the first switching device 102.
The under-voltage protection circuit 101 is configured to perform feed protection on the low-voltage battery 105 in a state where the low-voltage battery 105 is under-voltage, where the under-voltage protection circuit 101 may collect an output voltage of the low-voltage battery 105 and control the third switching device 104 to be turned on or off according to the output voltage, for example, when the output voltage is greater than or equal to a preset voltage value, it indicates that the low-voltage battery 105 is full of electricity, and control the third switching device 104 to be turned on, and when the output voltage is less than the preset voltage value, it indicates that the low-voltage battery 105 is under-voltage, and controls the third switching device 104 to be turned off. The magnitude of the preset voltage value may be set according to actual requirements, for example, the preset voltage value may be set according to the minimum pull-in voltage of the first switching device 102 and the second switching device 103 and the minimum discharge voltage of the low-voltage battery 105, and the preset voltage value is greater than or equal to the maximum value of the minimum pull-in voltage of the first switching device 102 and the second switching device 103 and the minimum discharge voltage of the low-voltage battery 105.
The low-voltage battery 105, the key switch 106, the second switching device 103 and the first switching device 102 are sequentially connected in series to form a start control loop for controlling the first switching device 102 to be turned on and off. The second switching device 103 is automatically turned ON when the key switch 106 of the electric vehicle is turned ON, that is, when the electric vehicle is controlled to start, and is automatically turned off after a preset time period is reached. The preset time period may be determined according to a start-up time period of the electric vehicle and a charging time period for the low-voltage battery 105 to reach a preset voltage value in an under-voltage state, and may be set to 15 seconds, for example.
The third switching device 104 is connected in parallel with the second switching device 103, i.e. when the key switch 106 is in the ON position and at least one of the second switching device 103 and the third switching device 104 is closed, the start control loop is turned ON, so that the first switching device 102 is closed, and the low-voltage storage battery 105 can be charged through the charging loop, and the corresponding electric equipment 107 is supplied with power through the low-voltage storage battery 105.
In the practical application process, in the working process of the electric vehicle, the second switch device 103 is in an off state, if the output voltage of the low-voltage storage battery 105 is smaller than a preset voltage value, the third switch device 104 is turned off, so that the first switch device 102 is turned off, the low-voltage storage battery 105 stops supplying power to the corresponding electric equipment 107, and the feed protection of the electric vehicle is realized, namely, the electric vehicle enters an under-voltage protection state, so that the overdischarge of the low-voltage storage battery 105 can be effectively prevented, and the service life of the low-voltage storage battery 105 is effectively prolonged.
When the electric vehicle is in the under-voltage protection state, if the electric vehicle is restarted, that is, the key switch 106 is turned ON, because the voltage of the low-voltage storage battery 105 is smaller than the preset voltage value, the third switch device 104 is in an open state and can not be closed, while the second switch device 103 is closed when the key switch 106 is turned ON, the starting control loop can still be ensured to be turned ON, so that the first switch device 102 is closed, and the low-voltage storage battery 105 can be automatically charged through the charging loop of the electric vehicle, so that the voltage of the low-voltage storage battery 105 is instantaneously raised, that is, the output voltage of the low-voltage storage battery 105 is greater than or equal to the preset voltage value, and then the third switch device 104 is closed, and when the second switch device 103 is automatically opened after the preset time period is reached, the third switch device 104 can still be kept in a closed state, that is continuously kept in the closed state, and the electric vehicle can still be ensured to be normally started when the electric vehicle is in the under-voltage protection state.
Therefore, in this embodiment, the first switching device 102 is connected in series in the power supply loop and the charging loop of the low-voltage storage battery 105 of the electric vehicle, the second switching device 103 and the first switching device 102 are connected in series in the starting control loop, the third switching device 104 is connected in parallel with the second switching device 103, and the closing and opening of the third switching device 104 are controlled by the under-voltage protection circuit 101, so that when the electric vehicle is in an under-voltage state, the low-voltage storage battery 105 can be effectively fed and protected, and the effective improvement of the service life of the low-voltage storage battery 105 is realized; the second switch device 103 is closed when the key switch 106 is turned ON, so that when the electric vehicle is in an under-voltage protection state, the low-voltage storage battery 105 can be automatically charged in the starting process, the voltage of the low-voltage storage battery 105 is instantaneously raised, the third switch device 104 is closed, and meanwhile, the second switch device 103 is automatically opened after reaching a preset time length, so that the electric vehicle can be normally started in the under-voltage protection state.
In an exemplary embodiment, as shown in fig. 2, the under-voltage protection circuit 101 includes a voltage acquisition device 201 and a voltage comparison device 202 that are sequentially connected;
the voltage acquisition device 201 is configured to acquire the output voltage;
the input end of the voltage comparing device 202 is connected to the output end of the voltage collecting device 201, and the output end of the voltage comparing device 202 is connected to the third switching device 104, so as to compare the output voltage with a preset voltage value and output a level signal to the third switching device 104.
In this embodiment, the voltage acquisition device 201 may employ a voltage sensor for acquiring the output voltage of the low-voltage battery 105 in real time, and transmitting the acquired output voltage to the voltage comparison device 202.
The voltage comparing device 202 may be a comparator, where the comparator may include a first input end, a second input end and an output end, the first input end is connected with the output end of the voltage collecting device 201 and is used for inputting the output voltage of the low-voltage storage battery 105, the second input end is used for inputting a preset voltage value, and the second input end may be connected with an input device, such as a touch display screen, a keyboard, etc., so as to input the preset voltage value through the input device, or may be connected with a voltage source through a voltage converting device so as to convert the voltage output by the voltage source into the preset voltage value and then transmit the converted voltage value to the voltage comparing device 202. The voltage comparing device 202 is configured to compare the output voltage of the low-voltage battery 105 with a preset voltage value, and output a level signal to the third switching device 104, where the level signal may be a high level signal 1 or a low level signal 0, and the level signal is used to control the third switching device 104 to be turned on or turned off. For example, when the output voltage of the low-voltage battery 105 is greater than or equal to the preset voltage value, the high-level signal 1 is output to the third switching device 104 to control the third switching device 104 to be closed, and otherwise, the low-level signal 0 is output to the third switching device 104 to control the third switching device 104 to be opened.
Therefore, in this embodiment, the voltage collecting device 201 collects the output voltage of the low-voltage storage battery 105, and the voltage comparing device 202 compares the output voltage of the low-voltage storage battery 105 with the preset voltage value to output the level signal to the third switching device 104, so that when the low-voltage storage battery 105 is in an under-voltage state, the third switching device 104 can be automatically controlled to be turned off, and then the first switching device 102 is controlled to be turned off, so that the low-voltage storage battery 105 is stopped to supply power to the corresponding electric equipment 107, and over-discharge of the low-voltage storage battery 105 is prevented, and effective improvement of the service life of the low-voltage storage battery 105 is achieved.
In an exemplary embodiment, the third switching device 104 employs a relay switch;
wherein, as shown in fig. 3, the third switching device 104 includes a third coil 307, a third normally-open contact 308, and a third normally-closed contact 309; the third coil 307 is connected to the output end of the voltage comparing device 202; the third normally open contact 308 and the third normally closed contact 309 are connected in the start control loop.
In this embodiment, the third switching device 104 employs a relay switch including a third coil 307, a third normally-open contact 308, a third normally-closed contact 309, and a third movable contact. The third coil 307 is connected to the output end of the voltage comparing device 202, for example, the first end of the third coil 307 is connected to the output end of the voltage comparing device 202, and the second end of the third coil 307 is grounded, so that the third coil 307 is powered up when the voltage comparing device 202 outputs the high level signal 1, and the third coil 307 is powered down when the voltage comparing device 202 outputs the low level signal 0. The third normally open contact 308 and the third normally closed contact 309 are connected in the starting control loop, when the third coil 307 is electrified, the third movable contact is attracted to be connected with the third normally open contact 308, namely, the third switching device 104 is closed, and when the third coil 307 is deenergized, the third movable contact is disconnected with the third normally open contact 308, namely, the third switching device 104 is disconnected, so that in the working process of the electric vehicle, the closing and opening of the third switching device 104 can be controlled in real time according to the output voltage of the low-voltage storage battery 105, the on-off of the starting control loop is controlled through the third switching device 104, the closing and opening of the first switching device 102 are controlled, the feed protection of the low-voltage storage battery 105 is realized, the overdischarge of the low-voltage storage battery 105 is prevented, the service life of the low-voltage storage battery 105 is prolonged, and the structure is simple, and the cost is low.
In an exemplary embodiment, the first switching device 102 employs a relay switch;
wherein, as shown in fig. 3, the first switching device 102 includes a first coil 301, a first normally open contact 302, and a first normally closed contact 303; the first coil 301 is connected in series in the start control loop, and the first normally open contact 302 and the first normally closed contact 303 are connected in the power supply loop and the charging loop.
In this embodiment, the first switching device 102 employs a relay switch including a first coil 301, a first normally open contact 302, a first normally closed contact 303, and a first movable contact. The first coil 301 is connected in series in the start control loop, when the start control loop is turned on, the first coil 301 is powered on, and when the start control loop is turned off, the first coil 301 is powered off. The first normally open contact 302 and the first normally closed contact 303 are connected in a power supply loop of the low-voltage storage battery 105, meanwhile, the first normally open contact 302 and the first normally closed contact 303 are also connected in a charging loop of the low-voltage storage battery 105, when the first coil 301 is powered ON, the first movable contact is attracted to be connected with the first normally open contact 302, namely, the first switching device 102 is closed, when the first coil 301 is powered off, the first movable contact is disconnected with the first normally open contact 302, namely, the first switching device 102 is disconnected, so that the first coil 301 is controlled to be powered ON and powered off through a starting control loop, the power supply loop and the charging loop can be automatically controlled to be powered ON and off when the key switch 106 is in an ON gear, and the key switch is simple in structure and low in cost.
In an exemplary embodiment, the second switching device 103 employs a time delay relay switch;
wherein, as shown in fig. 3, the second switching device 103 includes a second coil 304, a second normally open contact 305, and a second normally closed contact 306; a first end of the second coil 304 is connected with the positive electrode of the low-voltage storage battery 105 through the key switch 106, and a second end of the second coil 304 is connected with the negative electrode of the low-voltage storage battery 105; the second normally open contact 305 and the second normally closed contact 306 are connected in the start control loop.
In this embodiment, the second switching device 103 employs a time delay relay switch, which includes a second coil 304, a second normally open contact 305, a second normally closed contact 306, and a second movable contact. The first end of the second coil 304 is connected to the positive electrode of the low-voltage battery 105 through the key switch 106, and the second end of the second coil 304 is connected to the negative electrode of the low-voltage battery 105, so that the second coil 304, the low-voltage battery 105 and the key switch 106 form a closed loop, when the key switch 106 is turned ON, the loop is turned ON, the second coil 304 is powered through the low-voltage battery 105, and the second coil 304 is powered. The second normally open contact 305 and the second normally closed contact 306 are connected in the start control loop, when the second coil 304 is powered ON, the second movable contact is attracted to be connected with the second normally open contact 305, that is, the second switching device 103 is closed, so that when the key switch 106 is turned ON, the conduction of the start control loop can be automatically controlled, and then the first switching device 102 is controlled to be closed.
In an exemplary embodiment, the charging circuit includes a charging assembly 108 of the low voltage battery 105.
In this embodiment, the charging component 108 of the low-voltage storage battery 105 is used for charging the low-voltage storage battery 105, and for example, may include a charging source, which may be a newly added charging source, or may be a charging source of the electric vehicle itself, and for example, may include a power battery and a DCDC converter. After the charging loop is conducted, the charging source can automatically charge the low-voltage storage battery 105, so that when the electric vehicle is in an under-voltage protection state, the low-voltage storage battery 105 can be automatically charged in the starting process, the voltage of the low-voltage storage battery 105 is instantaneously raised, and the electric vehicle can be ensured to be normally started in the under-voltage protection state.
In an exemplary embodiment, as shown in fig. 4, the charging assembly 108 includes a DCDC converter 401 and a power cell 402;
wherein the DCDC converter 401 is connected in series in the charging loop, and the power battery 402 is connected with the DCDC converter 401.
In the present embodiment, the DCDC converter 401 is connected in series in the charging circuit of the low-voltage battery 105, and the power battery 402 is connected to the DCDC converter 401. A fourth switching device may be provided in the DCDC converter 401, and the fourth switching device is used to control the DCDC converter 401 to be turned on and off.
The fourth switching device may adopt a relay switch, and includes a fourth coil, where a first end of the fourth coil is connected to an anode of the low-voltage storage battery 105 through the key switch 106, and a second end of the fourth coil is connected to a cathode of the low-voltage storage battery 105, so that the fourth coil, the low-voltage storage battery 105 and the key switch 106 form a closed loop, when the key switch 106 is turned ON, the loop is turned ON, the fourth coil is powered by the low-voltage storage battery 105, the fourth coil is powered, and the fourth switching device is turned ON, otherwise, the fourth coil is powered off, and the fourth switching device is turned off, so that the DCDC converter 401 can be automatically controlled to be turned ON when the key switch 106 is turned ON, and the output voltage of the power battery 402 is converted into the required voltage of the low-voltage storage battery 105, and then the low-voltage storage battery 105 is charged.
It is understood that the under-voltage protection condition of the low-voltage storage battery 105 is independent of the power battery 402, and may be under-voltage of the low-voltage storage battery 105 caused by power consumption of an air conditioner, a song listening device, a radio, a car light, etc. under the condition that the electric vehicle is not under high voltage. In addition, when the power battery 402 is low in power, the power battery 402 may be charged with priority.
In an exemplary embodiment, as shown in fig. 5, a safety protection device 501 is further provided in the power supply circuit and the charging circuit.
In this embodiment, the safety protection device 501 is used for protecting the low-voltage storage battery 105 and the electric equipment 107, for example, may include an over-current protection device, an over-temperature protection device, etc., where the over-current protection device can prevent the damage of the electric equipment 107 caused by excessive discharge current or the damage of the low-voltage storage battery 105 caused by excessive charging current, and the over-temperature protection device can prevent the damage of the power supply circuit or the charging circuit caused by excessive temperature to related devices, so as to effectively protect the working safety of the low-voltage storage battery 105.
It will be appreciated that the power supply circuit and the charging circuit may share one or more safety protection devices 501, or that one or more safety protection devices 501 may be disposed in each of the power supply circuit and the charging circuit.
In an exemplary embodiment, the safety protection device 501 is a fuse.
In this embodiment, the fuse is configured to disconnect the power supply loop and/or the charging loop when the current exceeds a preset value, so that the safety of the low-voltage storage battery 105 and the electric equipment 107 can be effectively ensured. The specific type of the fuse can be set according to actual requirements, for example, a fuse of RC1A type can be adopted.
Based on any one of the above embodiments, the present utility model further provides an electric vehicle, including the electric vehicle starting circuit according to any one of the above embodiments.
In the present embodiment, the electric vehicle is a new energy vehicle, that is, a vehicle having a low-voltage storage battery and a power battery, for example, an electric truck, an electric loading vehicle, or the like.
The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present utility model without undue burden.
From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on this understanding, the foregoing technical solution may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the respective embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.
Claims (10)
1. An electric vehicle start-up circuit, comprising: the undervoltage protection circuit, the first switching device, the second switching device and the third switching device;
the first switching device is connected in series in a power supply loop of a low-voltage storage battery of the electric vehicle and a charging loop of the low-voltage storage battery, and the power supply loop and the charging loop further comprise a key switch of the electric vehicle; the first switch device is used for controlling the ON-off of the power supply loop and the charging loop when the key switch is in an ON gear;
the low-voltage storage battery, the key switch, the second switching device and the first switching device are sequentially connected in series to form a starting control loop; the second switch device is used for being closed when the key switch is turned ON to the ON gear and automatically opened after a preset time period is reached;
the under-voltage protection circuit is used for collecting the output voltage of the low-voltage storage battery and controlling the third switching device to be turned on or turned off according to the output voltage;
the third switching device is connected in parallel with the second switching device, and the first switching device is closed when the key switch is in an ON gear, and the second switching device and/or the third switching device is closed.
2. The electric vehicle starting circuit of claim 1, wherein the under-voltage protection circuit comprises a voltage acquisition device and a voltage comparison device connected in sequence;
the voltage acquisition device is used for acquiring the output voltage;
the input end of the voltage comparison device is connected with the output end of the voltage acquisition device, and the output end of the voltage comparison device is connected with the third switching device and is used for comparing the output voltage with a preset voltage value and outputting a level signal to the third switching device.
3. The electric vehicle start-up circuit of claim 2, wherein the third switching device employs a relay switch;
the third switching device comprises a third coil, a third normally-open contact and a third normally-closed contact; the third coil is connected with the output end of the voltage comparison device; the third normally open contact and the third normally closed contact are connected in the start control loop.
4. An electric vehicle start-up circuit as claimed in any one of claims 1 to 3, wherein the first switching means employs a relay switch;
the first switching device comprises a first coil, a first normally-open contact and a first normally-closed contact; the first coil is connected in series in the starting control loop, and the first normally open contact and the first normally closed contact are connected in the power supply loop and the charging loop.
5. An electric vehicle start-up circuit as claimed in any one of claims 1 to 3, wherein the second switching means employs a time delay relay switch;
the second switching device comprises a second coil, a second normally-open contact and a second normally-closed contact; the first end of the second coil is connected with the positive electrode of the low-voltage storage battery through the key switch, and the second end of the second coil is connected with the negative electrode of the low-voltage storage battery; the second normally open contact and the second normally closed contact are connected in the start control loop.
6. An electric vehicle start-up circuit as claimed in any one of claims 1 to 3, wherein the charging circuit comprises a charging assembly of the low voltage battery.
7. The electric vehicle start-up circuit of claim 6, wherein the charging assembly includes a DCDC converter and a power battery;
the DCDC converter is connected in series in the charging loop, and the power battery is connected with the DCDC converter.
8. An electric vehicle start-up circuit as claimed in any one of claims 1 to 3, characterized in that safety protection means are also provided in the supply circuit and the charging circuit.
9. The electric vehicle start-up circuit of claim 8, wherein the safety protection device is a fuse.
10. An electric vehicle comprising an electric vehicle start-up circuit as claimed in any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202223373260.2U CN218986363U (en) | 2022-12-15 | 2022-12-15 | Electric vehicle starting circuit and electric vehicle |
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| CN202223373260.2U CN218986363U (en) | 2022-12-15 | 2022-12-15 | Electric vehicle starting circuit and electric vehicle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118514519A (en) * | 2024-06-18 | 2024-08-20 | 南京金龙客车制造有限公司 | Distribution box control device and new energy heavy truck |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118514519A (en) * | 2024-06-18 | 2024-08-20 | 南京金龙客车制造有限公司 | Distribution box control device and new energy heavy truck |
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