CN111786439A - Pre-charging circuit, charging system, pre-charging method and train - Google Patents
Pre-charging circuit, charging system, pre-charging method and train Download PDFInfo
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- CN111786439A CN111786439A CN202010762742.3A CN202010762742A CN111786439A CN 111786439 A CN111786439 A CN 111786439A CN 202010762742 A CN202010762742 A CN 202010762742A CN 111786439 A CN111786439 A CN 111786439A
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- train
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- branch
- storage battery
- charger
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- 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
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
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- 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
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- 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
- H02J7/0042—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by the mechanical construction
- H02J7/0045—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by the mechanical construction concerning the insertion or the connection of the batteries
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- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The application discloses precharge circuit, charging system, precharge method and train, this precharge circuit includes: the first branch circuit comprises a first controllable switch; the second branch circuit comprises a second controllable switch and a preset resistor; the first branch is connected in parallel with the second branch. The controller in the pre-charging circuit can gradually increase the voltage of the filter capacitor in the train charger to the voltage of the train storage battery through conducting control of the first branch and the second branch in a multi-round charging process, so that when the connector of the train storage battery is directly connected with the connector of the train charger, no current (especially instantaneous impact current) can be generated between the train storage battery and the train charger due to the fact that no pressure difference exists between the voltage of the filter capacitor in the train charger and the train storage battery, the connector can not generate arc discharge burn due to the instantaneous impact current, and accordingly the occurrence of the arc discharge burn can be effectively avoided.
Description
Technical Field
The application relates to the technical field of trains, in particular to a pre-charging circuit, a charging system, a pre-charging method and a train.
Background
When a connector of a train storage battery is directly connected with a connector of a train charger for a train (for example, a motor train unit), the train storage battery directly charges a filter capacitor inside the train charger according to the voltage of the train storage battery, so that instantaneous impact current is generated. Wherein, because of the male needle of above-mentioned connector female needle area of contact is less for this instantaneous impulse current easily produces electric arc, so leads to above-mentioned connector to take place and easily to take place to draw the arc burn.
Disclosure of Invention
In order to solve the technical problems in the prior art, the application provides a pre-charging circuit, a charging system, a pre-charging method and a train, which can avoid arc discharge and burn when a connector of a train storage battery is directly connected with a connector of a train charger.
In order to achieve the above purpose, the technical solutions provided in the embodiments of the present application are as follows:
the embodiment of the application provides a pre-charging circuit, which comprises a first branch circuit, a second branch circuit and a controller; wherein the first branch comprises a first controllable switch; the second branch circuit comprises a second controllable switch and a preset resistor; the first branch is connected with the second branch in parallel;
the controller is used for controlling the second controllable switch to be closed when it is determined that the train storage battery is connected with the first end of the pre-charging circuit and the train charger is connected with the second end of the pre-charging circuit, so that the train storage battery charges a filter capacitor in the train charger through the second branch circuit; and when the current of the second branch circuit is determined to be stable, controlling the first controllable switch to be closed so that the train storage battery charges a filter capacitor in the train charger through the first branch circuit.
Optionally, the second branch comprises N parallel sub-branches;
the ith sub-branch comprises an ith second controllable switch and an ith preset resistor, and the ith second controllable switch is connected with the ith preset resistor in series; i is a positive integer, i is not more than N;
the controller is specifically configured to select a switch to be closed from a second controllable switch in an off state and control the switch to be closed so as to enable a sub-branch in which the switch to be closed is located to be switched on when it is determined that the train storage battery is connected with the first end of the pre-charging circuit and the train charger is connected with the second end of the pre-charging circuit; and when the current of the pre-charging circuit is determined to be stable, continuing to execute the selection of the switch to be closed from the second controllable switch in the open state and the subsequent steps.
Optionally, the ith preset resistor is the same as any preset resistor except the ith preset resistor;
alternatively, the first and second electrodes may be,
the ith preset resistance is different from any preset resistance except the ith preset resistance.
Optionally, the controller is further configured to control a preset prompting device to perform a pre-charging completion prompt when it is determined that the current of the first branch is stable, so that a user connects the train storage battery and the train charger through a preset connector for charging.
Optionally, the pre-charge circuit further comprises a current sensor; the current sensor is used for collecting current between the train storage battery and the train charger and sending the current to the controller;
and the controller is used for judging whether the current between the train storage battery and the train charger is stable or not according to the current sent by the current sensor.
Optionally, the controller is a train network system.
The embodiment of the application also provides a charging system, which comprises a train storage battery, a train charger and any one of the pre-charging circuits provided by the embodiment of the application;
the train storage battery is used for connecting the train storage battery with the first end of the pre-charging circuit, and when the train charger is connected with the second end of the pre-charging circuit, the filter capacitor in the train charger is charged through the pre-charging circuit.
Optionally, the train charger is configured to charge the train storage battery when it is determined that the train storage battery is connected to the train charger through a preset connector.
Optionally, the train storage battery is connected with the pre-charging circuit through a first connector, and the train charger is connected with the pre-charging circuit through a second connector.
The embodiment of the application also provides a train, and the train comprises any one of the charging systems provided by the embodiment of the application.
The embodiment of the application also provides a pre-charging method, which is applied to a controller, and the method comprises the following steps:
when it is determined that the train storage battery is connected with the first end of the pre-charging circuit and the train charger is connected with the second end of the pre-charging circuit, controlling the second controllable switch to be closed so that the train storage battery charges a filter capacitor in the train charger through the second branch circuit; the pre-charging circuit is any one of the pre-charging circuits provided by the embodiment of the application;
and when the current of the second branch circuit is determined to be stable, controlling the first controllable switch to be closed so that the train storage battery charges a filter capacitor in the train charger through the first branch circuit.
An embodiment of the present application further provides a controller, including: a processor and a memory; wherein the memory is for storing a computer program; the processor is configured to execute any implementation of the precharge method provided by the above method embodiments according to the computer program.
An embodiment of the present application further provides a computer-readable storage medium, which is used to store a computer program, where the computer program is used to execute any implementation manner of the precharge method provided in the foregoing method embodiment.
Compared with the prior art, the embodiment of the application has at least the following advantages:
the precharge circuit provided by the embodiment of the application comprises a first branch circuit, a second branch circuit and a controller, wherein the first branch circuit comprises a first controllable switch; the second branch circuit comprises a second controllable switch and a preset resistor; the first branch is connected in parallel with the second branch. After the train storage battery and the train charger are determined to be connected to the pre-charging circuit, the controller in the pre-charging circuit can firstly control the second controllable switch to be switched on so that a second branch in the pre-charging circuit is in a conducting state, and therefore the train storage battery can charge a filter capacitor in the train charger through the second branch; when the current of the second branch is determined to be stable, the controller can control the first controllable switch to be closed again so that the first branch in the pre-charging circuit is in a conducting state, at the moment, because no resistor exists in the first branch, the current in the pre-charging circuit circulates in the first branch, and therefore the train storage battery charges a filter capacitor in the train charger through the first branch, the voltage of the filter capacitor in the train charger reaches the voltage of the train storage battery, when the connector of the train storage battery is directly connected with the connector of the train charger, because the voltage of the filter capacitor in the train charger is consistent with the voltage of the train storage battery, instantaneous impact current cannot be generated between the train storage battery and the train charger, the connector cannot generate arc discharge burning due to the instantaneous impact current, and therefore arc discharge burning can be effectively avoided when the connector of the train storage battery is directly connected with the connector of the train charger .
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of a precharge circuit according to an embodiment of the present disclosure;
fig. 2 is a schematic current flow diagram of the second branch circuit when the second branch circuit is turned on according to the embodiment of the present disclosure;
fig. 3 is a schematic diagram of a precharge circuit when a second branch circuit is turned on according to an embodiment of the present disclosure;
fig. 4 is a schematic view illustrating a current flowing direction when the first branch is turned on according to an embodiment of the present disclosure;
FIG. 5 is a schematic diagram of another precharge circuit according to an embodiment of the present disclosure;
fig. 6 is a diagram illustrating a structure of a precharge circuit according to an embodiment of the present disclosure;
fig. 7 is a schematic structural diagram of a charging system according to an embodiment of the present application.
Detailed Description
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Circuit embodiment
Referring to fig. 1, a schematic diagram of a precharge circuit according to an embodiment of the present disclosure is shown.
The precharge circuit provided by the embodiment of the application comprises a first branch, a second branch and a controller (not shown in fig. 1). Wherein the first branch comprises a first controllable switch Q1; the second branch comprises a second controllable switch Q2 and a preset resistor R; the first branch is connected in parallel with the second branch.
The controller is used for controlling the second controllable switch Q2 to be closed when the train storage battery is determined to be connected with the first end of the pre-charging circuit and the train charger is determined to be connected with the second end of the pre-charging circuit, so that the train storage battery charges a filter capacitor in the train charger through a second branch circuit; and when the current of the second branch circuit is determined to be stable, controlling the first controllable switch Q1 to be closed so that the train storage battery charges a filter capacitor in a train charger through the first branch circuit.
It should be noted that the preset resistor R is used for limiting the current passing through the second branch, so as to limit the charging current of the train battery to the train charger.
It should be noted that, the embodiment of the present application is not limited to the connection manner between the train charger and the train storage battery, for example, the train charger and the train storage battery may be connected by using a preset connector X1 (as shown in fig. 1). In addition, the preset connector X1 is used for connecting the train charger and the train storage battery, and the train charger can charge the train storage battery through the preset connector.
It should be noted that, in the embodiment of the present application, the current stabilization means that the current in the circuit does not substantially change (that is, the magnitude of the current in the circuit remains unchanged, or the magnitude of the current in the circuit fluctuates only slightly).
In addition, the embodiment of the present application does not limit the connection manner of the train storage battery and the pre-charge circuit, and for example, the train storage battery and the pre-charge circuit may be connected by a first connector X2 (as shown in fig. 1). Similarly, the embodiment of the present application does not limit the connection manner between the train charger and the pre-charging circuit, for example, the train charger and the pre-charging circuit may be connected by a second connector X3 (as shown in fig. 1). The first connector X2 and the second connector X3 may be the same or different; however, the first connector X2 and the second connector X3 are both different from the default connector X1.
Based on the pre-charging circuit and the related content in fig. 1, when a user connects both the train storage battery and the train charger to the preset charging circuit, the train storage battery can charge the filter capacitor inside the train charger through the preset charging circuit. The operation principle of the precharge circuit is as follows:
firstly, when the controller determines that the train storage battery is connected with the first end of the pre-charging circuit and that the train charger is connected with the second end of the pre-charging circuit, it may be determined that both the train storage battery and the train charger are connected to the preset charging circuit, and at this time, the controller may first control the second controllable switch Q2 to be closed (as shown in fig. 2), so that the train storage battery can charge the filter capacitor inside the train motor by using the second branch circuit (as shown in fig. 3) in the pre-charging circuit, and thus the charging current between the train storage battery and the train charger can flow to L1 (that is, the positive pole of the train storage battery → the preset resistor R → the second controllable switch Q2 → the positive pole of the filter capacitor) along the current flow shown in fig. 2;
then, when the controller determines that the current of the second branch is stable, it may be determined that the train battery has increased the voltage of the filter capacitor in the train charger to the maximum voltage that the second branch can reach, at which time, in order to further increase the voltage of the filter capacitor inside the train charger, the controller may automatically control the first controllable switch Q1 to close, so that the train storage battery can utilize the first branch in the pre-charging circuit to charge the filter capacitor inside the train motor, so that the charging current between the train storage battery and the train charger can flow along the current flowing direction L2 (i.e., the positive pole of the train storage battery → the first controllable switch Q1 → the positive pole of the filter capacitor) shown in fig. 4, so that when it is determined that the current of the first branch is stable, it may be determined that the train battery has boosted the voltage of the filter capacitor in the train charger to the voltage value of the train battery.
It should be noted that, since there is no resistor in the first branch of the precharge circuit, so that the first branch of the precharge circuit is in an operating state after the first controllable switch Q1 is closed, in the embodiment of the present application, the controller may open the second controllable switch Q2 or may not open the second controllable switch Q2 when the first controllable switch Q1 is closed.
It should be further noted that, in the circuit diagram shown in fig. 3, the train charger includes a first filter capacitor C11, a second filter capacitor C12, a resistor R11 and a resistor R12, and at this time, the train battery can charge the first filter capacitor C11 and the second filter capacitor C12 in the train charger.
Based on the relevant content of the pre-charging circuit, when a user wants to connect the train storage battery with the train charger through the pre-connector, in order to avoid arc burning of the pre-connector, the user can connect the train storage battery with the train charger through the pre-charging circuit first, so that the pre-charging circuit can raise the voltage of the filter capacitor in the train charger to the voltage of the train storage battery, and therefore the situation that the train storage battery directly charges the filter capacitor inside the train charger when the train storage battery is connected with the train charger through the pre-connector can be avoided, the generation of instantaneous impact current can be avoided, and further the situation that the pre-connector is subjected to arc burning due to the instantaneous impact current can be avoided.
In some cases, in order to be able to raise the filter capacitor inside the train charger to the voltage of the train storage battery more safely, a multi-stage charging process may be performed using a pre-charging circuit, so in order to implement the multi-stage charging process, the second branch may include a plurality of sub-branches connected in parallel. Based on this, the present application also provides a possible implementation of the pre-charging circuit, in which, as shown in fig. 5, the pre-charging circuit includes a first branch circuit and a second branch circuit; the second branch circuit comprises N sub-branch circuits which are connected in parallel, the ith sub-branch circuit comprises an ith second controllable switch and an ith preset resistor, and the ith second controllable switch is connected with the ith preset resistor in series; i is a positive integer, and i is not more than N.
That is, as shown in fig. 5, the precharge circuit includes a first branch, a 1 st sub-branch, a 2 nd sub-branch, … …, and an nth sub-branch, and the first branch, the 1 st sub-branch, the 2 nd sub-branch, … …, and the nth sub-branch are all in a parallel relationship. Wherein, the 1 st sub-branch comprises a 1 st second controllable switch Q21And 1 st preset resistance R1The 2 nd sub-branch comprises a 2 nd second controllable switch Q22And 2 nd preset resistance R2… …, the Nth sub-branch comprises an Nth second controllable switch Q2NAnd an Nth preset resistance RN。
It should be noted that, in the embodiment of the present application, N is not limited, and N may be preset, for example, N is 2, and in this case, the precharge circuit is as shown in fig. 6.
It should be noted that, in the embodiment of the present application, the resistance values of the N preset resistors are not limited, and may be the same or different. In one possible implementation, the ith preset resistance is the same as any preset resistance except the ith preset resistance, i is a positive integer, and i is less than or equal to N. In another possible implementation manner, the ith preset resistance is different from any preset resistance except the ith preset resistance, i is a positive integer, and i is less than or equal to N.
In addition, the controller in the pre-charge circuit shown in fig. 5 is specifically configured to select a switch to be closed from the second controllable switch in the off state and control the switch to be closed to close the switch to make the sub-branch where the switch to be closed is located conduct when it is determined that the train storage battery is connected to the first end of the pre-charge circuit and it is determined that the train charger is connected to the second end of the pre-charge circuit; and when the current of the pre-charging circuit is determined to be stable, the selection of the switch to be closed from the second controllable switch in the open state and the subsequent steps are continuously executed. That is, the controller controls the N sub-branches to be closed in batches, so that the controller can control the train storage battery to charge the train charger in a grading manner through the pre-charging circuit. For ease of understanding, the following description is made with reference to examples.
As an example, for the precharge circuit shown in fig. 5, the operation flow may specifically include the following steps:
step 1: and when the controller determines that the train storage battery is connected with the first end of the pre-charging circuit and the train charger is connected with the second end of the pre-charging circuit, the controller controls the 1 st second controllable switch to be switched on so as to switch on the 1 st sub-branch, so that the train storage battery is charged to a filter capacitor in the train charger through the 1 st sub-branch.
Step 2: when the controller determines that the current between the train storage battery and the filter capacitor inside the train charger is stable (namely, the current in the pre-charging circuit is stable), the controller controls the 2 nd second controllable switch to be closed so as to enable the 2 nd sub-branch to be also conducted, and therefore the train storage battery is charged to the filter capacitor inside the train charger through the 1 st sub-branch to the 2 nd sub-branch.
The 2 nd sub-branch is connected with the 1 st sub-branch in parallel, so that the total resistance value in the pre-charging circuit is reduced, the current between the train storage battery and the filter capacitor inside the train charger is increased, and the voltage of the filter capacitor inside the train charger can be promoted for the second time by the train storage battery.
And step 3: when the controller determines that the current between the train storage battery and the filter capacitor inside the train charger is stable (namely, the current in the pre-charging circuit is stable), the controller controls the 3 rd second controllable switch to be closed so as to enable the 3 rd sub-branch to be also conducted, and therefore the train storage battery charges the filter capacitor inside the train charger through the 1 st sub-branch to the 3 rd sub-branch.
… … (analogy)
And 4, step 4: when the controller determines that the current between the train storage battery and the filter capacitor inside the train charger is stable (namely, the current in the pre-charging circuit is stable), the controller controls the Nth second controllable switch to be closed so as to enable the Nth sub-branch to be also conducted, and therefore the train storage battery is charged to the filter capacitor inside the train charger through the 1 st sub-branch to the Nth sub-branch.
Wherein, because of N sub-branch roads all are parallelly connected, make the resistance total value among the pre-charge circuit drop to the resistance minimum in the second branch road, thereby make the electric current between train battery and the inside filter capacitor of train charger increase to the electric current maximum in the second branch road, thereby make the train battery can carry out N times voltage promotion with the voltage of the inside filter capacitor of train charger, so can make the voltage of the inside filter capacitor of train charger be close to the voltage of train battery as far as possible.
And 5: when the controller determines that the current between the train storage battery and the filter capacitor inside the train charger is stable (namely, the current in the pre-charging circuit is stable), the controller controls the first controllable switch Q1 to be closed, so that the first branch circuit is conducted, and the train storage battery charges the filter capacitor in the train charger through the first branch circuit.
Based on the related contents of the above steps 1 to 5, in order to avoid the occurrence of arc burning, the pre-charging circuit may be used to gradually raise the filter capacitor inside the train charger to the voltage of the train storage battery through N +1 times of charging process, so as to effectively reduce the current passing through the connectors (i.e., the first connector X2 and the second connector X3), thereby effectively avoiding the occurrence of arc burning in the connectors during the charging process of the filter capacitor. And after the voltage of the filter capacitor in the train charger is increased to the voltage of the train storage battery by using the pre-charging circuit, no voltage difference exists between the filter capacitor in the train charger and the train storage battery, so that when a user connects the train storage battery and the train charger together by using the preset connector X1, no current can be generated between the train storage battery and the train charger, no current can pass through the preset connector X1, and the occurrence of arc burning of the preset connector X1 can be effectively avoided.
In addition, in order to better determine whether the current in the pre-charging circuit is stable, a current sensor can be installed in the pre-charging circuit in advance, so that the current sensor can acquire the current in the pre-charging circuit in real time. Based on this, the embodiment of the present application provides another possible implementation manner of the pre-charging circuit, in this implementation manner, the pre-charging circuit includes, in addition to the first branch, the second branch and the controller, a current sensor, and the current sensor is configured to collect current between the train storage battery and the train charger and send the current to the controller; at this time, the controller may be configured to determine whether the current between the train battery and the train charger is stable according to the current sent by the current sensor.
It should be noted that, the present embodiment does not limit the deployment position of the current sensor in the pre-charge circuit, for example, the current sensor may be deployed to a position around the second connector X3, so that the current sensor can detect the magnitude of the current value between the pre-charge circuit and the train charger.
In addition, in order to facilitate the user to know in time that the filter capacitor inside the train charger is increased to the voltage value of the train storage battery through the pre-charging circuit, the user can be reminded when the filter capacitor inside the train charger is determined to be increased to the voltage value of the train storage battery. Based on this, the embodiment of the present application provides another possible implementation manner of the pre-charge circuit, in which, in addition to the above functions, the controller in the pre-charge circuit is further configured to control the preset prompting device to perform the pre-charge completion prompt when it is determined that the current of the first branch is stable, so that a user connects the train storage battery and the train charger for charging through the preset connector.
The preset prompting device is used for prompting a user that the train storage battery raises the filter capacitor inside the train charger to the voltage value of the train storage battery through the pre-charging circuit. It should be noted that, the preset prompting device is not limited in the embodiments of the present application, for example, the preset prompting device may be a sound prompting device, so that the sound prompting device gives a prompting sound. For another example, the preset prompting device may be a prompting lamp, so that the prompting lamp prompts in a manner of changing the color of the light or turning on the light.
It can be seen that, in the pre-charging circuit, when the controller determines that the current of the first branch is stable, it may be determined that the train battery has increased the filter capacitor inside the train charger to the voltage value of the train battery through the pre-charging circuit, at this time, the controller may control the preset prompting device to prompt the user, so that the user can know, based on the prompt of the preset prompting device, that the train battery has increased the filter capacitor inside the train charger to the voltage value of the train battery through the pre-charging circuit, so that the user can timely connect the train battery and the train charger through the preset connector X1, so that the train charger can normally charge the train battery through the preset connector X1.
In some cases, in order to simplify the structure of the pre-charging circuit, a train network system may be used as a controller, so that the pre-charging circuit can realize a step charging process of the train storage battery on a filter capacitor inside a train charger under the control of the train network system.
It should be noted that the train storage battery provided in the embodiment of the present application can output a direct current, so that the train storage battery can charge a filter capacitor inside a train charger through the direct current.
Based on the related content of the precharge circuit provided by the above circuit embodiment, the embodiment of the present application further provides a charging system, which is described below with reference to the system embodiment. It should be noted that, for the technical details of the embodiments of the system, please refer to the relevant contents of the above circuit embodiments.
System embodiment
Referring to fig. 7, the figure is a schematic structural diagram of a charging system according to an embodiment of the present disclosure.
The charging system 700 provided by the embodiment of the application comprises a train storage battery 701, a train charger 702 and a pre-charging circuit 703;
the train storage battery 701 is used for charging a filter capacitor in the train charger 702 through the pre-charging circuit 703 when the train storage battery 701 is connected with a first end of the pre-charging circuit 703 and the train charger 702 is connected with a second end of the pre-charging circuit 703. The precharge circuit 703 may be any implementation of the precharge circuit provided in the embodiments of the present application.
In a possible embodiment, the train charger 702 is configured to charge the train storage battery 701 when it is determined that the train storage battery 701 is connected to the train charger 702 through a preset connector.
In one possible embodiment, the train battery 701 and the pre-charge circuit 703 are connected by a first connector, and the train charger 702 and the pre-charge circuit 703 are connected by a second connector.
Based on the related content of the charging system 700, when a user wants to connect a train storage battery with a train charger through a pre-connector, in order to avoid arc burning occurring on the pre-connector, the user can connect the train storage battery with the train charger through a pre-charging circuit first, so that the pre-charging circuit can raise the voltage of a filter capacitor in the train charger to the voltage of the train storage battery, thereby avoiding that the train storage battery directly charges the filter capacitor inside the train charger when the train storage battery is connected with the train charger through the pre-connector, thereby avoiding the generation of instantaneous impact current, and further avoiding that the pre-connector generates arc burning due to the instantaneous impact current.
Based on the related content of the precharge circuit provided by the above circuit embodiment, the embodiment of the present application further provides a precharge method applied to the controller of the precharge circuit, and the following description is made in conjunction with the method embodiment. It should be noted that, for the technical details of the method embodiment, please refer to the related contents of the above circuit embodiment.
Method embodiment
The pre-charging method provided by the embodiment of the application comprises the following steps:
when the controller determines that the train storage battery is connected with the first end of the pre-charging circuit and the train charger is connected with the second end of the pre-charging circuit, the controller controls the second controllable switch to be closed so that the train storage battery charges a filter capacitor in the train charger through the second branch circuit;
and when the controller determines that the current of the second branch circuit is stable, the controller controls the first controllable switch to be switched on, so that the train storage battery charges a filter capacitor in the train charger through the first branch circuit.
In a possible implementation manner, when the second branch includes N parallel sub-branches, and the ith sub-branch includes an ith second controllable switch and an ith preset resistor, and the ith second controllable switch is connected in series with the ith preset resistor; when i is a positive integer and is not more than N, the controller controls the second controllable switch to be closed so that the train storage battery charges a filter capacitor in the train charger through the second branch, and the method specifically comprises the following steps:
when the controller determines that the train storage battery is connected with the first end of the pre-charging circuit and the train charger is connected with the second end of the pre-charging circuit, the controller selects a switch to be closed from the second controllable switch in the disconnected state and controls the switch to be closed so as to enable the sub-branch where the switch to be closed is located to be connected; and when the current of the pre-charging circuit is determined to be stable, continuing to execute the selection of the switch to be closed from the second controllable switch in the open state and the subsequent steps.
In one possible embodiment, the method further comprises:
and when the controller determines that the current of the first branch circuit is stable, the controller controls a preset prompting device to perform pre-charging completion prompting, so that a user connects the train storage battery with the train charger through a preset connector for charging.
In a possible embodiment, when the pre-charging circuit further comprises a current sensor, and the current sensor is used for collecting the current between the train storage battery and the train charger and sending the current to the controller, the method further comprises:
and the controller judges whether the current of the second branch circuit is stable or not according to the current sent by the current sensor.
In a possible embodiment, when the pre-charging circuit further comprises a current sensor, and the current sensor is used for collecting the current between the train storage battery and the train charger and sending the current to the controller, the method further comprises:
and the controller judges whether the current of the first branch circuit is stable or not according to the current sent by the current sensor.
In a possible embodiment, when the pre-charging circuit further comprises a current sensor, and the current sensor is used for collecting the current between the train storage battery and the train charger and sending the current to the controller, the method further comprises:
and the controller judges whether the current of the pre-charging circuit is stable or not according to the current sent by the current sensor.
Based on the relevant content of the pre-charging method, after it is determined that both the train storage battery and the train charger are connected to the pre-charging circuit, the controller in the pre-charging circuit may control the second controllable switch to be closed first, so that a second branch in the pre-charging circuit is in a conducting state, and the train storage battery can charge a filter capacitor in the train charger through the second branch; when the current of the second branch is determined to be stable, the controller can control the first controllable switch to be closed again so that the first branch in the pre-charging circuit is in a conducting state, at the moment, because no resistor exists in the first branch, the current in the pre-charging circuit circulates in the first branch, and therefore the train storage battery charges a filter capacitor in the train charger through the first branch, the voltage of the filter capacitor in the train charger reaches the voltage of the train storage battery, when the connector of the train storage battery is directly connected with the connector of the train charger, because the voltage of the filter capacitor in the train charger is consistent with the voltage of the train storage battery, instantaneous impact current cannot be generated between the train storage battery and the train charger, the connector cannot generate arc discharge burning due to the instantaneous impact current, and therefore arc discharge burning can be effectively avoided when the connector of the train storage battery is directly connected with the connector of the train charger .
It can be seen that, when a user wants to connect a train storage battery with a train charger through a pre-connector, in order to avoid the occurrence of arc burning of the pre-connector, the user can connect the train storage battery with the train charger through a pre-charging circuit first, so that the pre-charging circuit can raise the voltage of a filter capacitor in the train charger to the voltage of the train storage battery, thereby avoiding the direct charging of the filter capacitor inside the train charger by the train storage battery when the train storage battery is connected with the train charger through the pre-connector, thereby avoiding the generation of instantaneous impact current, and further avoiding the occurrence of arc burning of the pre-connector due to the instantaneous impact current.
In addition, an embodiment of the present application further provides a controller, where the controller includes: a processor and a memory; wherein the memory is for storing a computer program; the processor is configured to execute any implementation of the precharge method provided by the above method embodiments according to the computer program.
In addition, an embodiment of the present application further provides a computer-readable storage medium, where the computer-readable storage medium is used to store a computer program, where the computer program is used to execute any implementation manner of the precharge method provided in the foregoing method embodiment.
In addition, this application embodiment still provides a train, and this train includes any kind of charging system that this application embodiment provided.
It should be understood that in the present application, "at least one" means one or more, "a plurality" means two or more. "and/or" for describing an association relationship of associated objects, indicating that there may be three relationships, e.g., "a and/or B" may indicate: only A, only B and both A and B are present, wherein A and B may be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of single item(s) or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b, c may be single or plural.
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner. Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make numerous possible variations and modifications to the present teachings, or modify equivalent embodiments to equivalent variations, without departing from the scope of the present teachings, using the methods and techniques disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the scope of the protection of the technical solution of the present invention, unless the contents of the technical solution of the present invention are departed.
Claims (11)
1. A pre-charge circuit, comprising a first branch, a second branch, and a controller; wherein the first branch comprises a first controllable switch; the second branch circuit comprises a second controllable switch and a preset resistor; the first branch is connected with the second branch in parallel;
the controller is used for controlling the second controllable switch to be closed when it is determined that the train storage battery is connected with the first end of the pre-charging circuit and the train charger is connected with the second end of the pre-charging circuit, so that the train storage battery charges a filter capacitor in the train charger through the second branch circuit; and when the current of the second branch circuit is determined to be stable, controlling the first controllable switch to be closed so that the train storage battery charges a filter capacitor in the train charger through the first branch circuit.
2. The circuit of claim 1, wherein the second branch comprises N parallel sub-branches;
the ith sub-branch comprises an ith second controllable switch and an ith preset resistor, and the ith second controllable switch is connected with the ith preset resistor in series; i is a positive integer, i is not more than N;
the controller is specifically configured to select a switch to be closed from a second controllable switch in an off state and control the switch to be closed so as to enable a sub-branch in which the switch to be closed is located to be switched on when it is determined that the train storage battery is connected with the first end of the pre-charging circuit and the train charger is connected with the second end of the pre-charging circuit; and when the current of the pre-charging circuit is determined to be stable, continuing to execute the selection of the switch to be closed from the second controllable switch in the open state and the subsequent steps.
3. The circuit of claim 2, wherein the ith preset resistance is the same as any preset resistance except the ith preset resistance;
alternatively, the first and second electrodes may be,
the ith preset resistance is different from any preset resistance except the ith preset resistance.
4. The circuit of claim 1, wherein the controller is further configured to control a preset prompting device to perform a pre-charging completion prompt when it is determined that the current of the first branch is stable, so that a user connects the train storage battery with the train charger through a preset connector for charging.
5. The circuit of claim 1, wherein the pre-charge circuit further comprises a current sensor; the current sensor is used for collecting current between the train storage battery and the train charger and sending the current to the controller;
and the controller is used for judging whether the current between the train storage battery and the train charger is stable or not according to the current sent by the current sensor.
6. The circuit of claim 1, wherein the controller is a train network system.
7. A charging system comprising a train battery, a train charger and a pre-charging circuit as claimed in any one of claims 1 to 6;
the train storage battery is used for connecting the train storage battery with the first end of the pre-charging circuit, and when the train charger is connected with the second end of the pre-charging circuit, the filter capacitor in the train charger is charged through the pre-charging circuit.
8. The system according to claim 7, wherein the train charger is configured to charge the train battery when it is determined that the train battery is connected to the train charger via a predetermined connector.
9. The system of claim 7, wherein the train battery is connected to the pre-charge circuit through a first connector and the train charger is connected to the pre-charge circuit through a second connector.
10. A train comprising a charging system according to any one of claims 7 to 9.
11. A pre-charging method applied to a controller, the method comprising:
when it is determined that the train storage battery is connected with the first end of the pre-charging circuit and the train charger is connected with the second end of the pre-charging circuit, controlling the second controllable switch to be closed so that the train storage battery charges a filter capacitor in the train charger through the second branch circuit; wherein the precharge circuit is the precharge circuit of any one of claims 1 to 6;
and when the current of the second branch circuit is determined to be stable, controlling the first controllable switch to be closed so that the train storage battery charges a filter capacitor in the train charger through the first branch circuit.
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| CN202010762742.3A CN111786439A (en) | 2020-07-31 | 2020-07-31 | Pre-charging circuit, charging system, pre-charging method and train |
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| CN202010762742.3A CN111786439A (en) | 2020-07-31 | 2020-07-31 | Pre-charging circuit, charging system, pre-charging method and train |
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Application publication date: 20201016 |