CN110729773A - Control system, control method and equipment of relay pre-charging circuit - Google Patents
Control system, control method and equipment of relay pre-charging circuit Download PDFInfo
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- CN110729773A CN110729773A CN201810777519.9A CN201810777519A CN110729773A CN 110729773 A CN110729773 A CN 110729773A CN 201810777519 A CN201810777519 A CN 201810777519A CN 110729773 A CN110729773 A CN 110729773A
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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
Abstract
The embodiment of the invention discloses a control system, a control method and control equipment of a relay pre-charging circuit. The control system includes: the controller and at least 2 relay pre-charging circuits which are mutually electrically connected; and the controller is used for controlling the relay pre-charging circuit corresponding to the preset power supply strategy to pre-charge and supply power to the capacitive load according to the preset power supply strategy. Wherein, relay pre-charge circuit includes: the main negative relay module, the high-voltage electric cabinet module, the main positive relay module and the capacitive load are sequentially connected to form a closed power supply circuit; the main positive relay module is also connected in parallel with the pre-charging protection module. According to the scheme provided by the embodiment of the invention, the adjustment can be carried out according to the actual condition of the relay pre-charging circuit, and the damage caused by excessive use times of the relay in a certain relay pre-charging circuit is avoided.
Description
Technical Field
The invention relates to the field of energy storage, in particular to a control system, a control method and control equipment of a relay pre-charging circuit.
Background
With the wide use of new energy batteries and new energy storage units, the energy storage system is driven to develop rapidly, so that the demand of the energy storage system is increased continuously. The energy storage electric cabinet is also more and more widely applied to an energy storage system. The energy storage electric cabinet in the energy storage system can store energy and release energy, so that the utilization rate of the energy is improved and the reasonable degree of utilization is improved. For example, the method is applied to large energy storage grid-connected power supply equipment. Among them, the safety problem of the energy storage system is concerned with.
At the present stage, the Battery pack can be pre-charged and powered by an energy storage Battery cabinet controlled by a Battery Management System (BMS), and when the voltage of the energy storage Battery cabinet is high, if the rear end output of the relay pre-charging circuit is a capacitive load, the instantaneous impulse current of the relay in the relay pre-charging circuit is high, and the relay is easy to damage.
Disclosure of Invention
The embodiment of the invention provides a control system, a control method and equipment of a relay pre-charging circuit, which can be adjusted according to the actual condition of the relay pre-charging circuit, and avoid the damage of a relay in a certain relay pre-charging circuit due to excessive use times.
According to a first aspect of embodiments of the present invention, there is provided a control system of a relay pre-charging circuit, the control system being electrically connected to a capacitive load, the control system comprising:
the controller and at least 2 relay pre-charging circuits which are mutually electrically connected;
the controller is used for controlling a circuit corresponding to a preset power supply strategy to pre-charge and supply power to the capacitive load according to the preset power supply strategy;
wherein, relay pre-charge circuit includes: the high-voltage electric cabinet module, the pre-charging protection module, the main negative relay module, the main positive relay module and the voltage measurement module;
the main negative relay module, the high-voltage electric cabinet module, the main positive relay module and the capacitive load are sequentially connected to form a closed power supply circuit; the main positive relay module is also connected with the pre-charging protection module in parallel;
the voltage measuring module is used for measuring the voltage at two ends of the main positive relay module;
the high-voltage cabinet module is used for pre-charging power to the capacitive load;
the main positive relay module is used for conducting when the voltage is smaller than a first preset voltage threshold value;
the pre-charging protection module is used for switching off when the voltage is smaller than a second preset voltage threshold value;
the second preset voltage threshold is smaller than the first preset voltage threshold.
According to a second aspect of the embodiments of the present invention, there is provided a method of a relay pre-charging circuit for a control system according to the first aspect, the control method including:
and controlling a relay pre-charging circuit corresponding to the preset power supply strategy to pre-charge and supply power to the capacitive load according to the preset power supply strategy.
According to a third aspect of embodiments of the present invention, there is provided a control apparatus including a memory, a processor, and a program stored on the memory and executable on the processor, the processor implementing the control method of the relay precharge circuit as in the second aspect when executing the program.
According to the control system, the control method and the equipment of the relay pre-charging circuit in the embodiment of the invention, the corresponding relay pre-charging circuit is controlled to pre-charge and supply power to the capacitive load according to the preset power supply strategy. Therefore, the relay pre-charging circuit can be adjusted in time according to the actual condition of the relay pre-charging circuit, the relay pre-charging circuit can be reasonably scheduled for use, the service life of the relay in each relay pre-charging circuit is balanced, and the damage caused by excessive use times of the relay in one relay pre-charging circuit is avoided.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention will be briefly described below, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic diagram showing the structure of a relay precharge circuit according to an embodiment of the present invention;
FIG. 2 is a schematic diagram showing a specific structure of a pre-charge protection module according to an embodiment of the present invention;
fig. 3 is a schematic diagram showing a specific structure of a relay pre-charging circuit according to another embodiment of the invention;
fig. 4 is a schematic configuration diagram showing a control system of the relay precharge circuit of the embodiment of the present invention;
FIG. 5 is a flow chart illustrating pre-charging a capacitive load according to a pre-charge strategy according to an embodiment of the present invention;
FIG. 6 is a flow chart illustrating a pre-charging of a capacitive load according to a pre-charging strategy according to another embodiment of the present invention;
fig. 7 is a flowchart illustrating a control method of a relay precharge circuit provided by an embodiment of the present invention;
fig. 8 is a flowchart illustrating a control method of a relay precharge circuit according to another embodiment of the present invention;
fig. 9 is a schematic diagram showing a hardware configuration of a control device in the embodiment of the present invention.
Detailed Description
Features and exemplary embodiments of various aspects of the present invention will be described in detail below, and in order to make objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It will be apparent to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The pre-charging circuit of the relay provided by the embodiment of the invention is mainly applied to a circuit containing a capacitive load. For example, in a circuit containing a capacitive load, the capacitive load needs to be pre-charged by a high voltage cabinet.
For a better understanding of the present invention, a relay precharge circuit, a method, a control system and a control method according to embodiments of the present invention will be described in detail below with reference to the accompanying drawings, and it should be noted that these embodiments are not intended to limit the scope of the present disclosure.
Fig. 1 is a schematic diagram showing a structure of a relay precharge circuit according to an embodiment of the present invention.
As shown in fig. 1, the relay precharge circuit 100 in the present embodiment is electrically connected to a capacitive load, and the relay precharge circuit 100 includes: a high-voltage cabinet module 110, a pre-charge protection module 120, a main negative relay module 130, a main positive relay module 140, and a voltage measurement module 150.
The main negative relay module 130, the high-voltage cabinet module 110, the main positive relay module 140 and the capacitive load are sequentially connected to form a closed power supply circuit. The main positive relay module 140 is also connected in parallel with the pre-charge protection module 120.
A voltage measurement module 150 for measuring the voltage across the main positive relay module 140.
A high voltage cabinet module 110 for pre-charging a capacitive load.
And the main positive relay module 140 is used for conducting when the voltage is smaller than a first preset voltage threshold value.
The pre-charge protection module 120 is configured to turn off when the voltage is less than a second preset voltage threshold.
The second preset voltage threshold is smaller than the first preset voltage threshold.
The main negative relay module 130 is connected to one end of the capacitive load, and in a specific example, the main negative relay module 130 may include at least one relay, which is not limited herein. The main positive relay module 140 is connected to the other end of the capacitive load, and the main positive relay module 140 may include at least one relay, which is not limited herein.
The voltage measurement module 150 may be a differential amplifier, and the voltage measurement module 150 may be further connected to the analog-to-digital converter ADC1 and the analog-to-digital converter ADC 2. One end of the ADC1 is connected to one end of the main positive relay module 140, and the other end is connected to the voltage measurement module 150. And ADC2 is connected at one end to the other end of main positive relay module 140 and at the other end to voltage measurement module 150. The voltage measuring module 150 is used for reading the sampling values of the ADC1 and the ADC2, and calculating the sampling values to obtain the voltage difference.
The negative pole of the high-voltage electric cabinet module 110 is connected with the main negative relay module 130, and the positive pole of the high-voltage electric cabinet module 110 is connected with the main positive relay module 140. In one example, the high voltage cabinet module 110 may be a battery pack, and the battery pack may be a lithium ion battery, a lithium metal battery, a lead acid battery, a nickel cadmium battery, a nickel hydrogen battery, a lithium sulfur battery, a lithium air battery, or a sodium ion battery, which is not particularly limited in the implementation of the present invention. In terms of battery scale, the battery pack may be a single battery cell, or may be a battery module or a battery pack, and is not specifically limited in the embodiment of the present invention.
The pre-charge protection module 120 is mainly used for pre-charging before the high-voltage cabinet module 110 starts to stably supply power to the capacitive load in the embodiment of the present invention. The pre-charge protection module 120 not only has a function of protecting the system relay, but also has a function of reducing the impact of sudden change of the bus current on the capacitive load. Therefore, the use of the pre-charge protection module 120 may allow the relay pre-charge circuit 100 to be safely powered.
"precharge" means that the capacitive load is energized during the power-on of the relay precharge circuit 100. It should be noted that after the relay precharge circuit 100 is turned on and stabilized, the function of the precharge power supply is turned off.
Before the pre-charge protection module 120 is turned on, the voltage measured by the voltage measurement module 150 is the maximum, and after the pre-charge protection module 120 is turned on, the voltage measured by the voltage measurement module 150 is gradually decreased until the voltage is less than the first preset voltage threshold, and the pre-charge protection module 120 is turned off. Such as: when the voltage measured by the voltage measurement module 150 reaches about 90% of the voltage at the two ends of the high-voltage cabinet module 110, the pre-charging power supply is considered to be completed, the main positive relay module 140 is closed, then the voltage measured by the voltage measurement module 150 is gradually reduced until the voltage is smaller than a first preset voltage threshold value, and the pre-charging protection module 120 is disconnected, so that the relay pre-charging circuit 100 is safely connected.
According to the embodiment of the invention, the pre-charging protection module is added, so that the impact current at the moment of opening the relay can be reduced, the relay in the pre-charging circuit of the relay is protected, the relay is not easy to damage, in addition, the use cost is indirectly reduced, and the service life of the relay is prolonged.
In one embodiment, the pre-charge protection module 120 is turned on after a delay of a predetermined fixed time period after the main negative relay module 130 is turned on.
Specifically, the pre-charge protection module 120 may be turned on after a 200ms delay in closing the main negative relay module 130.
By delaying for a period of time, the state of the closed main and negative relay module 130 can be stabilized first, and subsequent inaccurate voltage measurement caused by unstable state when the main and negative relay module 130 is just closed can be avoided.
Fig. 2 is a schematic diagram illustrating a specific structure of a pre-charge protection module according to an embodiment of the present invention.
As shown in fig. 2, the pre-charge protection module 120 includes: a pre-charge relay unit 121 and a current limiting resistance unit 122;
one end of the pre-charging relay unit 121 is connected with the high-voltage cabinet module 110, the other end of the pre-charging relay unit 121 is connected with one end of the current-limiting resistance unit 122, and the other end of the current-limiting resistance unit 122 is connected with the capacitive load;
and a pre-charge relay unit 121 for turning off when the voltage is less than a first preset voltage threshold.
The pre-charge relay unit 121 includes: one end of the at least one relay is connected with the high-voltage cabinet module 110, and the other end of the at least one relay is connected with one end of the current-limiting resistance unit 122;
when the voltage is less than the first preset voltage threshold, the relays in the pre-charge relay unit 121 are all turned off.
Specifically, the current limiting resistance unit 122 includes: and one end of the at least one current limiting resistor is connected with the pre-charging relay unit 121, and the other end of the at least one current limiting resistor is connected with the capacitive load 110.
It should be understood that the selection of the current limiting resistor is combined with the maximum inrush current capability of the relay in the pre-charge relay unit 121 and the transient power capability of the current limiting resistor itself.
Fig. 3 is a schematic diagram showing a specific structure of a relay pre-charging circuit according to another embodiment of the invention.
As shown in fig. 3, the relay pre-charge circuit 100 is connected in parallel with the capacitive load, and the relay pre-charge circuit 100 includes: the battery pack, a relay K1, a resistor R1, a relay K2, a relay K3, an analog-to-digital converter ADC1, an analog-to-digital converter ADC2 and sampling voltage dividing resistors R2, R3, R4 and R5.
The relay K3, the battery pack, the relay K2 and the capacitive load are sequentially connected to form a closed power supply circuit; one end of the relay K1 is connected with the battery pack, the other end is connected with the resistor R1, and the other end of the resistor R1 is connected with the capacitive load. One end of the ADC1 is connected to one end of the R2 and R3, and the other end of the ADC1 is connected to the voltage measuring module 150. One end of the ADC2 is connected to one end of the R4 and R5, and the other end of the ADC2 is connected to the voltage measuring module 150.
It should be understood that the resistor R1 is selected to combine the maximum inrush current capability of the relay K1 and the transient power capability of the resistor R1.
In the embodiment of the invention, the relay K3 is closed firstly, and the relay K1 is closed after 200ms delay. When the pressure difference between the ADC1 and the ADC2 is detected to be less than 30V, the relay K2 is closed. When the pressure difference between the ADC1 and the ADC2 is detected to be less than 10V, the relay K1 is opened.
According to the embodiment of the invention, the relay pre-charging circuit 100 can reduce the impact current at the moment when the relay K1 is opened by adding the relay K1 and the resistor R1, so that the relay K2 and the relay K3 are protected, and meanwhile, the relay K1 is not easy to damage, so that the service lives of the relay K1, the relay K2 and the relay K3 are prolonged, and in addition, the use cost is indirectly reduced.
Fig. 4 is a schematic diagram showing a structure of a control system of a relay pre-charging circuit according to an embodiment of the present invention, and the same reference numerals are used for the same or equivalent structures in fig. 4 as those in fig. 1. It should be noted that, in fig. 4, the double arrows indicate that information interaction can be performed between the controller 410 and the relay pre-charge circuit 100, and there can also be an electrical connection between the controller 410 and the relay pre-charge circuit 100. The information interaction is mainly a control instruction, such as: the controller 410 controls the relay precharge circuit 100 by a control command. The electrical connection is for the controller 410 to collect electrical signals, such as voltage, etc., of the respective relay pre-charge circuits 100.
As shown in fig. 4, the control system 400 includes: the controller 410 and at least 2 relay precharge circuits 100 as described above electrically connected to each other;
and the controller 410 is configured to control the relay pre-charge circuit 100 corresponding to a preset power supply strategy to pre-charge and power the capacitive load according to the preset power supply strategy.
In the embodiment of the invention, the controller controls the specific relay pre-charging circuit to pre-charge and supply power to the capacitive load, and the other relay pre-charging circuits directly supply power, so that the service lives of the relay K2 and the resistor R1 can be prolonged.
In one embodiment, the controller 410 is specifically configured to control the highest voltage relay pre-charge circuit of the high-voltage cabinet module 110 to pre-charge the capacitive load.
It can be understood that by adding the pre-charge protection module, the inrush current at the moment of opening the relay can be reduced, and the service life of the relay in the main positive relay module 140 and the main negative relay module 130 can be increased. In addition, since the relay pre-charging circuit 100 with the highest voltage of the high-voltage electric cabinet module 110 is selected for pre-charging, the pre-charging time of the main positive relay module 140 and the main negative relay module 130 in the relay pre-charging circuit 100 can be reduced.
In an embodiment, the controller 410 is specifically configured to control the highest-voltage relay pre-charge circuit of the high-voltage cabinet module 110 to pre-charge and supply the capacitive load when the number of times that the highest-voltage relay pre-charge circuit of the high-voltage cabinet module 110 pre-charges and supplies the capacitive load is less than a preset power supply number threshold.
It should be noted that, in the present invention, when the number of times of the pre-charging of the relay pre-charging circuit 100 is greater than or equal to the preset power-supply number threshold, the pre-charging of the relay pre-charging circuit 100 is prohibited.
In addition, the preset power supply time threshold can be set according to the parameters and model of the relay playing the role of precharging in the relay precharging circuit 100. For example: the preset power supply time threshold is set according to the parameters and model of the relay K1 in fig. 3.
In an embodiment, the controller 410 is specifically configured to control the relay pre-charge circuit with the lowest voltage of the high-voltage cabinet module 110 to pre-charge and power the capacitive load when the number of times that the relay pre-charge circuit with the highest voltage of the high-voltage cabinet module 110 pre-charges and powers the capacitive load is greater than or equal to a preset power-supply number threshold and the number of times that the relay pre-charge circuit with the lowest voltage of the high-voltage cabinet module 110 pre-charges and powers the capacitive load is less than a preset power-supply number threshold.
It can be understood that the relay pre-charging circuit 100 with the lowest voltage of the high-voltage cabinet module 110 is selected for pre-charging, so that the relay inrush current in the pre-charging protection module 120 can be reduced, and the service life of the relay in the pre-charging protection module 120 can be prolonged.
In an embodiment, the controller 410 is specifically configured to control any one of the relay pre-charging circuits 100 with the pre-charging frequency of 0 to pre-charge the capacitive load when the number of times that the relay pre-charging circuit 100 with the highest voltage of the high-voltage cabinet module 110 pre-charges the capacitive load is greater than or equal to a preset power-supply number threshold, the number of times that the relay pre-charging circuit 100 with the lowest voltage of the high-voltage cabinet module 110 pre-charges the capacitive load is greater than or equal to a preset power-supply number threshold, and the number of times that the capacitive load is pre-charged is 0 in the presence of the relay pre-charging circuit 100 with the pre-charging frequency of 0.
In an embodiment, the controller 410 is specifically configured to control any one of the relay pre-charging circuits 100 that pre-charges the capacitive load for a time less than the preset power supply time threshold to pre-charge the capacitive load when the number of times that the relay pre-charging circuit 100 with the highest voltage of the high-voltage cabinet module 110 pre-charges the capacitive load is greater than or equal to the preset power supply time threshold, the number of times that the relay pre-charging circuit 100 with the lowest voltage of the high-voltage cabinet module 110 pre-charges the capacitive load is greater than or equal to the preset power supply time threshold, and there is no relay pre-charging circuit 100 that pre-charges the capacitive load for a time 0.
It can be understood that the relay pre-charging circuit 100 that pre-charges and supplies power to the capacitive load for a number of times less than the preset power supply number threshold is selected for pre-charging and supplying power, so that the long-term use of the same relay can be avoided, and the balanced use of each relay can be avoided, so that the damage to a certain relay caused by the long-term use can be avoided.
In one embodiment, the high-voltage cabinet modules 110 are all labeled with address numbers;
the controller 410 is specifically configured to control the relay pre-charging circuit 100 with the address number M of the high-voltage cabinet module 110 to pre-charge and supply power to the capacitive load when the pre-charging power supply frequency of the relay pre-charging circuit 100 with the address number M of the high-voltage cabinet module is smaller than a preset power supply frequency threshold;
or, the method is specifically configured to, when the number of times that the relay pre-charge circuit 100 with the address number M of the high-voltage cabinet module 110 performs pre-charge power supply on the capacitive load is greater than or equal to the preset power supply number threshold, detect whether the number of times that the relay pre-charge circuit 100 with the address number M +1 of the high-voltage cabinet module 110 performs pre-charge power supply on the capacitive load is greater than or equal to the preset power supply number threshold, until the number of times that the relay pre-charge circuit 100 with the address number M + S of the high-voltage cabinet module 100 performs pre-charge power supply on the capacitive load is detected to be less than the preset power supply number threshold, control the relay pre-charge circuit 100 with the address number M + S of the high-voltage cabinet module to perform pre-charge power supply on the capacitive load, where M is an integer greater than or.
It will be appreciated that S may be ± 1, ± 2, …, for example: when M is 3, the number of times that the relay pre-charge circuit 100 detecting that the address number of the high-voltage cabinet module 110 is 3 performs pre-charge power supply on the capacitive load is greater than or equal to a preset power supply number threshold, the relay pre-charge circuit 100 detecting that the address number of the high-voltage cabinet module 110 is 4 is detected; when the number of times that the relay pre-charging circuit 100 with the address number of 4 of the high-voltage cabinet module 110 performs pre-charging power supply on the capacitive load is greater than or equal to the preset power supply number threshold, the relay pre-charging circuit 100 with the address number of 5 of the high-voltage cabinet module 110 is detected. For another example, when the number of times that the relay pre-charge circuit 100 with the address number of 5 of the high-voltage cabinet module 110 performs pre-charge power on the capacitive load is smaller than the preset power supply number threshold, it is determined that S is 2, the relay pre-charge circuit 100 with the address number of 5 of the high-voltage cabinet module 110 is controlled to perform pre-charge power on the capacitive load; when the number of times that the relay pre-charging circuit 100 with the address number of 1 of the high-voltage cabinet module 110 performs pre-charging on the capacitive load is smaller than the preset power supply number threshold, it is determined that S is-2, and the relay pre-charging circuit 100 with the address number of 1 of the high-voltage cabinet module 110 is controlled to perform pre-charging on the capacitive load.
FIG. 5 is a flow chart illustrating pre-charging a capacitive load according to a pre-charge strategy according to an embodiment of the present invention.
As shown in fig. 5, with respect to the process by which the controller 410 is used to precharge capacitive loads according to a precharge strategy:
step S500, address numbering is performed on the high-voltage cabinet module 110 in advance, and the number of times of pre-charging power supply of each relay pre-charging circuit 100 is read and recorded.
Step S510, detecting the voltage of the high voltage cabinet module 110 in each relay pre-charge circuit 100, reading the address number P of the relay pre-charge circuit 100 with the highest voltage, and reading the number of times of pre-charge power supply of the relay pre-charge circuit 100 with the highest voltage, where P is an integer greater than or equal to 1.
In step S520, it is determined whether the number of times that the relay pre-charge circuit 100 with address number P performs pre-charge power supply on the capacitive load is greater than or equal to a preset power supply number threshold, if yes, step S540 is performed, and if not, step S530 is performed.
Step S530, controlling the relay pre-charge circuit 100 to pre-charge the capacitive load, and increasing the number of times of pre-charging the relay pre-charge circuit 100 by 1, and performing step S620.
Step S540, when the number of times that the relay pre-charge circuit 100 with the address number P performs pre-charge power supply on the capacitive load is greater than or equal to the preset power supply number threshold, detecting the voltage of the high voltage cabinet module 110 in each relay pre-charge circuit 100, reading the address number L of the relay pre-charge circuit 100 with the lowest voltage, and reading the number of times that the relay pre-charge circuit 100 with the lowest voltage performs pre-charge power supply, where L is an integer greater than or equal to 1 and P, L are different.
In step S550, it is determined whether the number of times that the relay pre-charge circuit 100 performs pre-charge power supply on the capacitive load is greater than or equal to the preset power supply number threshold, if yes, step S560 is performed, and if no, step S530 is performed.
In step S560, when the number of times that the relay pre-charge circuit 100 performs pre-charge power supply on the capacitive load is greater than or equal to the preset power supply number threshold value, the number of times that the remaining relay pre-charge circuits 100 perform pre-charge power supply on the capacitive load is read.
Step S570, determining whether there is a relay precharge circuit 100 whose number of times of precharging the capacitive load is 0 in the remaining relay precharge circuits 100, and if there is a relay precharge circuit 100, executing step S580; if not, go to step S590.
In step S580, if there is a relay pre-charge circuit 100 that pre-charges the capacitive load for 0 times, the relay pre-charge circuit that controls the pre-charge for 0 times controls the pre-charge for the capacitive load, and the pre-charge for the capacitive load is added with 1.
It is to be understood that when there is another relay pre-charge circuit 100 with the number of times of pre-charging 0, the relay protection circuit 100 controlling any one of the relay pre-charge circuits with the number of times of pre-charging 0 pre-charges the capacitive load. Therefore, the times of pre-charging power supply are synchronously accumulated by all the relay pre-charging circuits, and the phenomenon that a certain relay pre-charging circuit 100 is damaged due to long-term use is avoided.
In step S590, if there is no relay precharge circuit 100 that precharges the capacitive load for 0, it is determined whether there is a relay precharge circuit 100 that precharges the capacitive load for less than a preset power supply frequency threshold, and if so, step S600 is executed, and if not, step S610 is executed.
Step S600, controlling any one of the relay pre-charge circuits 100 that performs pre-charge power supply on the capacitive load for a time less than a preset power supply time threshold, and performing pre-charge power supply on the capacitive load, where the pre-charge power supply time of the relay pre-charge circuit 100 that performs pre-charge power supply on the capacitive load is less than the preset power supply time threshold is increased by 1.
In step S610, all the relay precharge circuits 100 are disabled from supplying power to the capacitive load. The power supply comprises pre-charging power supply and normal power supply (namely, power supply for conducting the main negative relay module and the main positive relay module).
And step S620, ending.
FIG. 6 is a flow chart illustrating a process for pre-charging a capacitive load according to a pre-charge strategy according to another embodiment of the present invention.
As shown in fig. 6, the process of the controller 410 for pre-charging the capacitive load according to the pre-charging strategy may further include:
step S500, address numbering is performed on the high-voltage cabinet module 110 in advance, and the number of times of precharging power supply of each relay precharging circuit 100 is read and recorded.
It is understood that step S500 in fig. 6 is the same step as step S500 in fig. 5 described above.
In step S630, it is determined whether the number of times of precharging power supply of the relay precharging circuit 100 with the address number M is greater than or equal to a preset power supply number threshold, if so, step S650 is executed, and if not, step S640 is executed.
Step S640 is to control the relay pre-charge circuit 100 to pre-charge and supply power to the capacitive load, and the number of times of pre-charge and supply power of the relay pre-charge circuit 100 is increased by 1.
Step S650, determining whether the number of times of pre-charging power supply of the relay pre-charging circuit 100 with the address number M +1 is greater than or equal to a preset power supply time threshold, if so, executing step S660, and if not, executing step S640;
in step S660, it is determined whether the number of times of precharging power supply of the relay precharging circuit 100 with the address number M + S is greater than or equal to a preset power supply number threshold, and if so, step S670 is executed. If so, go to step S640.
In step S670, the relay precharge circuit 100 is disabled from precharging. It should be noted that, if the number of times of precharging all the relay precharging circuits 100 is greater than or equal to the preset power supply number threshold, all the relay precharging circuits 100 are prohibited from supplying power to the capacitive load. The power supply comprises pre-charging power supply and normal power supply (namely, power supply for conducting the main negative relay module and the main positive relay module).
It can be understood that, selecting a fixed relay pre-charging circuit for pre-charging can reduce the selection time, thereby indirectly improving the efficiency of pre-charging.
The method for pre-charging the relay circuit according to the embodiment of the invention is described in detail below with reference to the accompanying drawings.
Fig. 7 is a flowchart illustrating a control method of a relay precharge circuit according to an embodiment of the present invention.
As shown in fig. 7, for the relay precharge circuit 100 as described above, the method includes:
and S710, controlling the main negative relay module to be conducted.
And S720, after the main negative relay module is conducted, delaying the preset fixed time period and controlling the pre-charging protection module to be conducted.
And S730, measuring the voltage at two ends of the main positive relay module.
And S740, controlling the main positive relay module to be conducted when the voltage is smaller than the first preset voltage threshold value.
And S750, controlling the pre-charging protection module to be disconnected when the voltage is smaller than a second preset voltage threshold value.
The second preset voltage threshold is smaller than the first preset voltage threshold.
According to the method for pre-charging the relay circuit, the pre-charging protection module is added, so that the impact current at the moment when the relay is started can be reduced, the relay is protected, meanwhile, the relay is not easy to damage, in addition, the use cost is indirectly reduced, and the service life of the relay is prolonged.
Fig. 8 is a flowchart illustrating a control method of a relay precharge circuit according to another embodiment of the present invention.
As shown in fig. 8, for the system 400 as described above, the control method includes:
and S810, controlling the relay pre-charging circuit 100 corresponding to the preset power supply strategy to pre-charge and supply power to the capacitive load according to the preset power supply strategy.
In the embodiment of the invention, after the controller controls the specific relay pre-charging circuit to complete pre-charging, other relay pre-charging circuits do not need pre-charging power supply, and only the main positive relay and the main negative relay are closed to normally power on. Therefore, the service life of the pre-charging power supply relay can be prolonged.
For the specific situation that the relay pre-charging circuit corresponding to the preset power supply strategy is controlled to supply power to the capacitive load according to the preset power supply strategy, reference may be made to relevant contents of the foregoing embodiments, and details are not described herein again.
The control system and the control method thereof according to the embodiments of the present invention described with reference to fig. 1 to 8 may be implemented by a control apparatus.
Fig. 9 is a schematic diagram showing a hardware configuration of a control device 900 according to an embodiment of the present invention.
The control device comprises a memory 901, a processor 902 and a computer program stored on the memory 901 and executable on the processor 902.
In one example, the processor 902 may include a Central Processing Unit (CPU), or an Application Specific Integrated Circuit (ASIC), or may be configured as one or more integrated circuits implementing embodiments of the present application.
Memory 901 may include mass storage for data or instructions. By way of example, and not limitation, memory 901 may comprise an HDD, floppy disk drive, flash memory, optical disk, magneto-optical disk, magnetic tape, or Universal Serial Bus (USB) drive or a combination of two or more of these. Memory 901 may include removable or non-removable (or fixed) media, where appropriate. The memory 901 may be internal or external to the management device 900, where appropriate. In a particular embodiment, the memory 901 is a non-volatile solid-state memory. In certain embodiments, memory 901 comprises Read Only Memory (ROM). Where appropriate, the ROM may be mask-programmed ROM, Programmable ROM (PROM), Erasable PROM (EPROM), Electrically Erasable PROM (EEPROM), electrically rewritable ROM (EAROM), or flash memory or a combination of two or more of these.
The processor 902 runs a program corresponding to the executable program code by reading the executable program code stored in the memory 901 for executing the control method of the battery pack system in the above-described respective embodiments.
In one example, the management device 900 can also include a communication interface 903 and a bus 904. As shown in fig. 9, the memory 901, the processor 902, and the communication interface 903 are connected via a bus 904 to complete communication therebetween.
The communication interface 903 is mainly used for implementing communication between modules, apparatuses, units and/or devices in this embodiment of the application. Input devices and/or output devices are also accessible through communication interface 903.
The bus 904 comprises hardware, software, or both that couple the components of the management device 900 to each other. By way of example, and not limitation, the bus 904 may include an Accelerated Graphics Port (AGP) or other graphics bus, an Enhanced Industry Standard Architecture (EISA) bus, a Front Side Bus (FSB), a Hyper Transport (HT) interconnect, an Industry Standard Architecture (ISA) bus, an infiniband interconnect, a Low Pin Count (LPC) bus, a memory bus, a Micro Channel Architecture (MCA) bus, a Peripheral Component Interconnect (PCI) bus, a PCI-Express (PCI-X) bus, a Serial Advanced Technology Attachment (SATA) bus, a video electronics standards association local (VLB) bus, or other suitable bus or a combination of two or more of these. Bus 904 may include one or more buses, where appropriate. Although specific buses are described and shown in the embodiments of the application, any suitable buses or interconnects are contemplated by the application.
An embodiment of the present application further provides a storage medium, where a program is stored, and when the program is executed by a processor, the control method of the battery pack system in the above embodiments can be implemented.
All parts of the specification are described in a progressive mode, the same and similar parts of all embodiments can be referred to each other, and each embodiment is mainly introduced to be different from other embodiments. In particular, as to the method embodiments, the device embodiments and the storage medium embodiments, since they are substantially similar to the battery system embodiments, the description is relatively simple, and in relation to the description in the battery system embodiments, reference may be made to the description.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present disclosure, and all the changes or substitutions should be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (15)
1. A control system for a relay pre-charge circuit, the control system comprising: the controller and at least 2 relay pre-charging circuits which are mutually electrically connected;
the controller is used for controlling the relay pre-charging circuit corresponding to a preset power supply strategy to pre-charge and supply power to the capacitive load according to the preset power supply strategy;
wherein, the relay pre-charging circuit includes: the high-voltage electric cabinet module, the pre-charging protection module, the main negative relay module, the main positive relay module and the voltage measurement module;
the main negative relay module, the high-voltage electric cabinet module, the main positive relay module and the capacitive load are sequentially connected to form a closed power supply circuit; the main positive relay module is also connected with the pre-charging protection module in parallel;
the voltage measuring module is used for measuring the voltage at two ends of the main positive relay module;
the high-voltage cabinet module is used for pre-charging power to the capacitive load;
the main positive relay module is used for conducting when the voltage is smaller than a first preset voltage threshold value;
the pre-charging protection module is used for switching off when the voltage is smaller than a second preset voltage threshold value;
the second preset voltage threshold is smaller than the first preset voltage threshold.
2. The control system of the relay pre-charge circuit according to claim 1,
the controller is specifically configured to control the relay pre-charge circuit with the highest voltage of the high-voltage cabinet module to pre-charge and supply power to the capacitive load.
3. The control system of the relay pre-charge circuit according to claim 1, wherein the controller is specifically configured to control the relay pre-charge circuit with the highest voltage of the high-voltage cabinet module to pre-charge the capacitive load when the number of times that the relay pre-charge circuit with the highest voltage of the high-voltage cabinet module pre-charges the capacitive load is smaller than the preset power supply number threshold.
4. The control system of the relay pre-charge circuit according to claim 1,
the controller is specifically configured to control the relay pre-charge circuit with the lowest voltage of the high-voltage cabinet module to pre-charge and supply the capacitive load when the number of times that the relay pre-charge circuit with the highest voltage of the high-voltage cabinet module performs pre-charge and supply on the capacitive load is greater than or equal to the preset power supply number threshold, and the number of times that the relay pre-charge circuit with the lowest voltage of the high-voltage cabinet module performs pre-charge and supply on the capacitive load is smaller than the preset power supply number threshold.
5. The control system of the relay pre-charge circuit according to claim 1, wherein the controller is specifically configured to control any one of the relay pre-charge circuits with pre-charge power frequency of 0 to pre-charge the capacitive load when the number of times that the relay pre-charge circuit with the highest voltage of the high-voltage cabinet module pre-charges the capacitive load is greater than or equal to the preset power supply number threshold, the number of times that the relay pre-charge circuit with the lowest voltage of the high-voltage cabinet module pre-charges the capacitive load is greater than or equal to the preset power supply number threshold, and the number of times that the relay pre-charge circuit with pre-charge power frequency of 0 exists to pre-charge the capacitive load.
6. The control system of the relay pre-charge circuit according to claim 1, wherein the controller is specifically configured to control any one of the relay pre-charge circuits that pre-charges the capacitive load for a time less than a preset power supply time threshold to pre-charge the capacitive load when the number of times that the relay pre-charge circuit with the highest voltage of the high-voltage cabinet module pre-charges the capacitive load is greater than or equal to the preset power supply time threshold, the number of times that the relay pre-charge circuit with the lowest voltage of the high-voltage cabinet module pre-charges the capacitive load is greater than or equal to the preset power supply time threshold, and the number of times that the relay pre-charge circuit with the lowest voltage of the high-voltage cabinet module pre-charges the capacitive load is not present.
7. The control system of the relay pre-charge circuit of claim 1, wherein the high-voltage cabinet modules are each labeled with an address number;
the controller is specifically configured to control the relay pre-charging circuit with the address number of M of the high-voltage cabinet module to pre-charge and supply power to the capacitive load when the pre-charging and power-supplying times of the relay pre-charging circuit with the address number of M of the high-voltage cabinet module is smaller than a preset power-supplying time threshold;
alternatively, the first and second electrodes may be,
the method is specifically used for detecting whether the pre-charging power supply times of the relay pre-charging circuit is larger than or equal to a preset power supply time threshold when the address number of the high-voltage cabinet module is M and the pre-charging power supply times of the relay protection circuit is larger than or equal to the preset power supply time threshold, and controlling the address number of the high-voltage cabinet module to be M + S to pre-charge and supply power to the capacitive load when the pre-charging power supply times of the relay protection circuit is smaller than the preset power supply time threshold when the address number of the high-voltage cabinet module is M + S, wherein M is an integer larger than or equal to 1, and M + S is an integer larger than or equal to 1.
8. A control method for a relay precharge circuit, for use in a control system as claimed in any one of claims 1 to 7, the control method comprising:
and controlling the relay pre-charging circuit corresponding to the preset power supply strategy to pre-charge and supply power to the capacitive load according to the preset power supply strategy.
9. The method for controlling the relay pre-charge circuit according to claim 8, wherein the controlling the relay pre-charge circuit corresponding to a preset power supply strategy to pre-charge the capacitive load according to the preset power supply strategy comprises:
and the relay pre-charging circuit for controlling the highest voltage of the high-voltage cabinet module pre-charges and supplies power to the capacitive load.
10. The method for controlling the relay pre-charge circuit according to claim 8, wherein the controlling the relay pre-charge circuit corresponding to a preset power supply strategy to pre-charge the capacitive load according to the preset power supply strategy comprises:
and when the times of the relay pre-charging circuit with the highest voltage of the high-voltage cabinet module for pre-charging and supplying power to the capacitive load are smaller than the preset power supply time threshold value, controlling the relay pre-charging circuit with the highest voltage of the high-voltage cabinet module for pre-charging and supplying power to the capacitive load.
11. The method for controlling the relay pre-charge circuit according to claim 8, wherein the controlling the relay pre-charge circuit corresponding to a preset power supply strategy to pre-charge the capacitive load according to the preset power supply strategy comprises:
when the times of the pre-charging power supply of the capacitive load by the relay pre-charging circuit with the highest voltage of the high-voltage cabinet module are greater than or equal to the preset power supply time threshold, and the times of the pre-charging power supply of the capacitive load by the relay pre-charging circuit with the lowest voltage of the high-voltage cabinet module are smaller than the preset power supply time threshold, the pre-charging power supply of the capacitive load by the relay pre-charging circuit with the lowest voltage of the high-voltage cabinet module is controlled.
12. The method for controlling the relay pre-charge circuit according to claim 8, wherein the controlling the relay pre-charge circuit corresponding to a preset power supply strategy to pre-charge the capacitive load according to the preset power supply strategy comprises:
when the number of times of performing pre-charging power supply on the capacitive load by the relay pre-charging circuit with the highest voltage of the high-voltage cabinet module is greater than or equal to the preset power supply number threshold, the number of times of performing pre-charging power supply on the capacitive load by the relay pre-charging circuit with the lowest voltage of the high-voltage cabinet module is greater than or equal to the preset power supply number threshold, and the number of times of performing pre-charging power supply on the capacitive load is 0 in the relay pre-charging circuit, the number of times of controlling pre-charging power supply is any one of 0 in the relay pre-charging circuit, and the capacitive load is subjected to pre-charging power supply.
13. The method for controlling the relay pre-charge circuit according to claim 8, wherein the controlling the relay pre-charge circuit corresponding to a preset power supply strategy to pre-charge the capacitive load according to the preset power supply strategy comprises:
when the number of times of performing pre-charging power supply on the capacitive load by the relay pre-charging circuit with the highest voltage of the high-voltage cabinet module is greater than or equal to the preset power supply number threshold, the number of times of performing pre-charging power supply on the capacitive load by the relay pre-charging circuit with the lowest voltage of the high-voltage cabinet module is greater than or equal to the preset power supply number threshold, and the number of times of performing pre-charging power supply on the capacitive load is not 0 in the relay pre-charging circuit, the relay pre-charging circuit is controlled to perform pre-charging power supply on the capacitive load, wherein the number of times of performing pre-charging power supply on the capacitive load is smaller than the preset power supply number.
14. The method of claim 9, wherein the high-voltage cabinet modules are each labeled with an address number;
the controlling the relay pre-charging circuit corresponding to the preset power supply strategy to pre-charge and supply power to the capacitive load according to the preset power supply strategy includes:
when the pre-charging power supply times of the relay pre-charging circuit with the address number M of the high-voltage cabinet module are smaller than a preset power supply time threshold value, controlling the relay pre-charging circuit with the address number M of the high-voltage cabinet module to pre-charge and supply power to the capacitive load;
alternatively, the first and second electrodes may be,
when the address number of the high-voltage cabinet module is M and the pre-charging power supply frequency of the relay pre-charging circuit is greater than or equal to a preset power supply frequency threshold value, detecting whether the address number of the high-voltage cabinet module is M +1 or not, and determining whether the pre-charging power supply frequency of the relay protection circuit is greater than or equal to the preset power supply frequency threshold value or not until the address number of the high-voltage cabinet module is M + S or not is detected, when the pre-charging power supply frequency of the relay protection circuit is less than the preset power supply frequency threshold value, controlling the address number of the high-voltage cabinet module to be M + S or not, the relay protection circuit performs pre-charging power supply on the capacitive load, wherein M is an integer greater than or equal to 1, and M +.
15. A control apparatus comprising a memory, a processor, and a program stored on the memory and executable on the processor, the processor implementing the method of controlling a relay precharge circuit according to any one of claims 8 to 14 when executing the program.
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