CN111884306A

CN111884306A - Charging device

Info

Publication number: CN111884306A
Application number: CN202010880633.1A
Authority: CN
Inventors: 马威; 陆斌; 徐佼; 曹婵
Original assignee: New United Rail Transit Technology Co Ltd
Current assignee: New United Rail Transit Technology Co Ltd
Priority date: 2020-08-27
Filing date: 2020-08-27
Publication date: 2020-11-03

Abstract

The invention discloses a charging device, the number of charging modules is at least two, the three-phase power supply input unit of each charging module is connected in parallel and input, the power unit is connected in parallel and output, thus the output is expanded in parallel, the capacity can be flexibly expanded under the condition of meeting the use of a load, when one charging module has a fault, other charging modules can normally supply power, and meanwhile, the adjacent charging modules are in communication connection, when one or more charging modules have a fault, the communication of the system can not be interrupted, and the charging device can still carry out normal communication transmission with an upper computer through unified external communication transmission. Meanwhile, the control unit controls each power unit of each charging module to regulate the uniform output voltage according to the temperature of the storage battery collected by the storage battery temperature collecting unit, so that all the charging modules keep the synchronous change of the output voltage.

Description

Charging device

Technical Field

The invention relates to the technical field of storage battery charging, in particular to a charging device.

Background

With the continuous improvement and improvement of passenger demands and the design of rail vehicles, power supply devices and other equipment under the vehicles need to be developed towards light weight and high efficiency, and meanwhile, enough margin is provided for providing sufficient power guarantee for subsequent load improvement. The charging device is an extremely important power supply device of a vehicle circuit system, supplies power to an emergency storage battery and loads and control circuits such as lighting, broadcasting, video and the like, and mainly adopts the following scheme at present:

two DC/DC modules are adopted, the cathode input end of the first module is connected with the anode input end of the second module, the output of the first module is connected with the output of the second module in parallel, the IGBT unit of each module is still a bridge circuit, and the voltage value of the power device is selected and calculated.

The scheme has the following problems that the input end adopts two paths of DC/DC modules with one path of negative electrode connected with the other path of positive electrode, the selectable voltage withstanding value of the power device is reduced, the output efficiency is greatly improved, the circuit structure is more complex, any one path of the modules fails, the other path of the modules bears larger load and voltage impact, and the potential safety hazard of the circuit is larger; meanwhile, when the control unit is subjected to software curing, the control panel needs to be detached, a PC (personal computer) is matched with a special program burner to refresh a control program, and the control panel is easily damaged if the connection is wrong or the power is lost in the middle of the burning process. In order to reduce the transmission quantity of communication data between the charging device and the train safety computer, the data of the charging device is generally inquired and exchanged in a half-duplex mode at a frequency of 200ms, the storage space is small, the transmission bytes are few, once the charging device fails, detailed failure data cannot be uploaded to the train safety computer, the failure judgment is difficult, and the train operation is delayed.

Disclosure of Invention

In view of the above, a first object of the present invention is to provide a charging device, so as to solve the problem that in the prior art, two DC/DC modules with one negative electrode connected to another positive electrode are used at an input end, a voltage withstanding value of a power device is selectable to be reduced, and when any one of the two DC/DC modules fails, the other DC/DC module will bear a large load and a large voltage impact, so that potential safety hazards of a circuit are large.

In order to achieve the first object, the invention provides the following technical scheme:

a charging device comprises a charging module, wherein the charging module comprises a control unit, a storage battery temperature acquisition unit respectively connected with the control unit, a three-phase power input unit used for being connected with a three-phase power supply and a power unit used for providing power for the storage battery and a direct-current bus; the number of the charging modules is at least two, the three-phase power supply input units of the charging modules are connected in parallel for input, the power units are connected in parallel for output, and the charging modules are in communication connection;

the control unit controls each power unit to adjust output voltage according to the temperature of the storage battery collected by the storage battery temperature collecting unit so as to charge the storage battery.

Preferably, any one of the charging modules includes at least two communication interfaces, one communication interface of the charging module at the head end of all the charging modules is connected to an external device for external communication, and one communication interface of the charging module at the tail end of all the charging modules is connected to a terminal resistor for terminating communication.

Preferably, the method further comprises the following steps:

the handheld operation terminal can be connected with a control unit of any one of the charging modules, the handheld operation terminal comprises a human-computer interaction module for parameter setting and display, and the human-computer interaction module comprises a terminal communication interface, a key for parameter input, a display screen for displaying a working state and data parameters and a state indicator lamp for state display;

the key comprises a local/remote switching key for switching between a local mode and a remote mode, and when the local/remote switching key is in the remote mode, the parameter of the charging module is locked; when the local/remote switching key is in the local mode, the handheld operation terminal can change the parameters of the charging module.

Preferably, any of the charging modules further comprises:

the cooling fan, the temperature acquisition unit and the current detection unit are respectively connected with the control unit, the temperature acquisition unit is used for detecting the temperature of the charging module, and the current detection unit is used for detecting the current of the output circuit of the charging module;

the control unit controls the rotating speed of the cooling fan according to the output power calculated by the detection temperature of the temperature acquisition unit and/or the detection current of the current detection unit;

when the detected temperature of the temperature acquisition unit is higher than a set temperature value and/or the output power is higher than a set output power, the control unit controls the cooling fan to increase the rotating speed;

when the detection temperature of the temperature acquisition unit is lower than the set temperature value and/or the output power is lower than the set output power, the control unit controls the cooling fan to reduce the rotating speed.

Preferably, any of the control units comprises:

the input over-voltage and under-voltage control subunit is connected with the three-phase power supply input unit and compares the input voltage of the three-phase power supply input power supply with a preset input voltage range;

when the input voltage of the three-phase power supply input power supply exceeds the preset input voltage range, sending an input over-voltage and under-voltage alarm signal to alarm and restarting the charging module, continuously judging whether the input voltage of the restarted three-phase power supply input power supply exceeds the preset input voltage range, and if so, cutting off power supply and sending an input over-voltage and under-voltage alarm signal to alarm; if not, the power is supplied normally.

Preferably, the input over-voltage and under-voltage control subunit includes:

the surge absorption circuit is used for absorbing or suppressing the oscillation voltage in the power supply line;

and/or a phase-splitting delay circuit for controlling the delay connection of the circuit of the non-area or phase-splitting interval;

the first comparator is connected with the surge absorption circuit and/or the neutral section delay circuit respectively;

the first comparator compares the stable voltage of the surge absorption circuit and/or the neutral section passing delay circuit with the preset input voltage range, and when the input voltage of the three-phase power supply input power supply exceeds the preset input voltage range, the first comparator sends an input over-voltage and under-voltage alarm signal to alarm, restarts the charging module and sends a starting signal to the second comparator;

the second comparator continuously judges whether the input voltage of the three-phase power supply input power supply exceeds the preset input voltage range, if so, the first-stage circuit-breaking protection circuit is triggered to cut off power supply and an input over-voltage and under-voltage alarm signal is sent to alarm; if not, the power is supplied normally.

Preferably, any of the control units further comprises:

the output over-under voltage control subunit is connected with the output circuit of the charging module and compares the output voltage of the output circuit of the charging module with a preset output voltage range;

when the output voltage of the output circuit of the charging module is smaller than the minimum value of the preset output voltage range, sending an output over-voltage and under-voltage alarm signal to alarm and restarting the charging module, and repeatedly judging whether the output voltages of the three-phase power supply output power supply within preset times are all smaller than the minimum value of the preset output voltage range, if so, cutting off power supply and sending an output over-voltage and under-voltage alarm signal to alarm; if not, normally supplying power;

and when the output voltage of the output circuit of the charging module is larger than the maximum value of the preset output voltage range, sending an over-voltage and under-voltage alarm signal to alarm and cutting off power supply.

Preferably, any of the control units further comprises:

and the overcurrent control subunit is used for controlling the charging module to restart when the output current of the current detection unit is greater than or equal to the preset current value according to the comparison between the output current detected by the current detection unit and the preset current value, and uploading a current fault signal to the upper computer when the output current detected by the current detection unit is greater than or equal to the preset current value within the preset times of repeated judgment, and the overcurrent control subunit is connected with the current detection unit.

Preferably, any of the control units further comprises:

and the shutdown self-locking control subunit is used for controlling the charging module to restart after receiving the fault signal, and respectively cutting off the connection between the three-phase power supply input unit and the three-phase power supply and the connection between the power unit and the load and sending the fault signal and the load shedding request signal to the upper computer when the charging module fails to restart twice.

Preferably, the terminal communication interface is an RJ45 network interface.

The charging device comprises charging modules, wherein each charging module comprises a control unit, a storage battery temperature acquisition unit, a three-phase power input unit and a power unit, the storage battery temperature acquisition units are respectively connected with the control unit, the three-phase power input units are used for being connected with a three-phase power supply, the power units are used for providing power for a storage battery and a direct-current bus, the number of the charging modules is at least two, the three-phase power input units of each charging module are connected in parallel for input, the power units are connected in parallel for output, and the adjacent charging modules are in; the control unit controls each power unit to adjust output voltage according to the temperature of the storage battery collected by the storage battery temperature collecting unit so as to charge the storage battery.

The charging device provided by the invention has the advantages that the number of the charging modules is at least two, the three-phase power supply input units of the charging modules are connected in parallel and input, and the power units are connected in parallel and output, so that the output is expanded in parallel, the capacity can be flexibly expanded under the condition of meeting the use of a load, when one charging module fails, other charging modules can normally supply power, and meanwhile, the adjacent charging modules are in communication connection, when one or more charging modules fail, the communication interruption of a system can not be caused, and the charging device can still carry out normal communication transmission with an upper computer through unified external communication transmission. Meanwhile, the control unit controls each power unit of each charging module to regulate the uniform output voltage according to the temperature of the storage battery collected by the storage battery temperature collecting unit, so that all the charging modules keep the synchronous change of the output voltage.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings 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 of the present invention, 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 of a charging module according to an embodiment of the present invention;

FIG. 2 is a flowchart illustrating the input over-voltage and under-voltage control according to an embodiment of the present invention;

FIG. 3 is a flowchart illustrating the control of the output over-voltage and under-voltage according to an embodiment of the present invention;

fig. 4 is a schematic control principle diagram of a cooling fan according to an embodiment of the present invention;

fig. 5 is a schematic diagram of an address bit of each charging module combined by multiple charging modules in parallel according to an embodiment of the present invention;

fig. 6 is a block diagram of a multi-charging module parallel combination system according to an embodiment of the present invention.

The drawings are numbered as follows:

the system comprises a charging module 1, a three-phase power supply 2, a PTC thermistor 3, a first communication interface 4, a second communication interface 5, a handheld operation terminal 6, a first comparator 7, a second comparator 8 and an output under-voltage control subunit 9;

the device comprises a rectifying circuit 101, a step-down transformer circuit 102, a resonant circuit 103, a rectifying, filtering and isolating circuit 104, a control unit 105, a cooling fan 106, an NTC thermistor 107 and a current sensor 108.

Detailed Description

The embodiment of the invention discloses a charging device, which aims to solve the problems that in the prior art, two paths of DC/DC modules with one path of negative electrodes connected with the other path of positive electrodes are adopted at an input end, the circuit structure is more complicated, any one path of modules fails, the other path of modules bears larger load and voltage impact, and the potential safety hazard of a circuit is larger.

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, 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 invention.

Referring to fig. 1 to fig. 6, fig. 1 is a schematic diagram of a charging module according to an embodiment of the present invention; FIG. 2 is a flowchart illustrating the input over-voltage and under-voltage control according to an embodiment of the present invention; FIG. 3 is a flowchart illustrating the control of the output over-voltage and under-voltage according to an embodiment of the present invention; fig. 4 is a schematic control principle diagram of a cooling fan according to an embodiment of the present invention; fig. 5 is a schematic diagram of an address bit of each charging module combined by multiple charging modules in parallel according to an embodiment of the present invention; fig. 6 is a block diagram of a multi-charging module parallel combination system according to an embodiment of the present invention.

In a specific embodiment, the charging device provided by the invention comprises charging modules 1, wherein each charging module 1 comprises a control unit 105, a storage battery temperature acquisition unit respectively connected with the control unit 105, a three-phase power supply 2 input unit used for being connected with a three-phase power supply 2 and a power unit used for providing power for a storage battery and a direct-current bus, the number of the charging modules 1 is at least two, the three-phase power supply 2 input units of each charging module 1 are connected in parallel for input, the power units are connected in parallel for output, and the adjacent charging modules 1 are in communication connection;

the control unit 105 controls each power unit to adjust the output voltage according to the temperature of the storage battery collected by the storage battery temperature collecting unit so as to charge the storage battery.

The input unit of a three-phase power supply 2 of the charging module 1 is connected with a three-phase alternating current power supply, and the charging module 1 comprises a rectifying circuit 101, a step-down transformer circuit 102, a resonant circuit 103, a power circuit and a rectifying, filtering and isolating circuit 104. The specific structure of each circuit can refer to the prior art, and the direct current power DC +/Bat-is output to supply a train bus, and the Bat +/Bat-charges a storage battery. The power circuit is preferably constructed by controllable silicon carbide semiconductor devices, the output ripple voltage is lower due to high-frequency driving, the output efficiency is higher, and meanwhile the reactor is miniaturized and lightened. Like an 8kW charging device with equal power, a power device made of silicon carbide has the advantages of high voltage resistance, low on-resistance and high speed. By increasing the switching frequency, the size of peripheral devices such as a transformer, an inductor, a capacitor and the like is smaller, for example, the size of the silicon carbide power module can reach about 1/10 of the size of silicon material, the problem of heat generation of the silicon power device due to large switching loss is solved, and the conversion efficiency of more than 90% is easily achieved by taking an AC/DC conversion example.

The number of the charging modules 1 is two or more, the three-phase power supply 2 input units of the charging modules 1 are connected in parallel for input, the power units of the charging modules 1 are connected in parallel for output, the charging modules 1 are connected in series through communication modes such as RS485 and CAN to form a communication system, CAN communication or communication such as Ethernet CAN be used for connecting external equipment such as a vehicle-mounted HMI (human machine interface) screen or other terminals to the outside, the external equipment is connected with and shares the temperature of the storage battery, and output voltage and charging current are adjusted. Preferably, each charging module 1 starting signal line is directly connected with the DC24V bus, and the charging device automatically starts and outputs voltage when AC power is input.

As shown in fig. 5, when multiple charging modules 1 are combined in parallel, the control unit 105 sets a unique code for each charging module 1 by means of a code Bit, for example, Bit1 is 1, and Bit2 is 0, which represents the charging module 11; bit1 is 0, Bit2 is 1 and represents the charging module 1, other charging modules 1 can also continue to set a unique code, and the code Bit expansion and the setting of more charging module 1 codes can be performed by using 3 bits if the Bit number is not enough, so that the disorder and confusion of the outgoing lines of each charging module 1 during data transmission are avoided, and meanwhile, the external vehicle-mounted HMI or other display equipment is also used for identifying and distinguishing the working state of each module to perform accurate control.

The storage battery temperature acquisition unit is connected with a PTC thermistor used for detecting the temperature of the storage battery, and the control unit 105 receives the temperature of the storage battery fed back by the storage battery temperature sampling PTC thermistor and adjusts the direct-current output voltage of the charging module 1 in real time.

By applying the charging device provided by the invention, the number of the charging modules 1 is at least two, the three-phase power supply 2 input units of each charging module 1 are connected in parallel and input, and the power units are connected in parallel and output, so that the output is expanded in parallel, the capacity can be flexibly expanded under the condition of meeting the load use, when one charging module 1 fails, other charging modules 1 can normally supply power, and meanwhile, the adjacent charging modules 1 are in communication connection, when one or more charging modules 1 fail, the communication interruption of the system can not be caused, and the charging device can still carry out normal communication transmission with an upper computer through unified external communication transmission. Meanwhile, the control unit 105 controls each power unit of each charging module 1 to adjust the uniform output voltage according to the temperature of the storage battery collected by the storage battery temperature collecting unit, so that all the charging modules 1 keep the synchronous change of the output voltage.

Specifically, any one of the charging modules 1 includes at least two communication interfaces. In one embodiment, any one of the charging modules 1 comprises a first communication interface 4 and a second communication interface 5, when a single charging module 1 works, the first communication interface 4 transmits external communication to connect with a vehicle-mounted HMI or other display equipment, and the second communication interface 5 is provided with a terminal resistor to cut off the communication so as to improve and enhance the communication transmission quality. In the parallel combined system of the plurality of charging modules 1, one communication interface of the charging module 1 at the head end of all the charging modules 1 is connected with an external device for external communication, and one communication interface of the charging module 1 at the tail end of all the charging modules 1 is connected with a terminal resistor for stopping communication.

When the power supply system is used, a plurality of charging modules 1 can be connected in parallel in an actual power supply system according to the requirements of loads and actual working conditions to realize the capacity expansion of the whole output power. The connection of the communication of the parallel combination system of the multiple charging modules 1 is completed according to the manner described in fig. 6, taking the charging module 11 as an example, the communication port of the charging module performs communication transmission to the outside. The PTC thermistor samples the temperature of the storage battery and feeds back the sampled temperature to the charging modules 1, the sampled temperature of the storage battery is shared by each charging module 1 in the system through the system communication of fig. 6, and the control unit 105 in the charging module 1 performs controllable rectification and real-time adjustment of the output voltage according to the temperature of the storage battery and the voltage/current compensation characteristics, so that all the charging modules 1 maintain the synchronous change of the output voltage. When the multi-charging-module-1 parallel combination system is built, the control parameters of all the charging modules 1 need to be kept consistent. The input three-phase power 2 is connected in parallel to the system.

Further, still include:

the handheld operation terminal 6 can be connected with the control unit 105 of any charging module 1, the handheld operation terminal 6 comprises a man-machine interaction module for parameter setting and display, and the man-machine interaction module comprises a key for parameter input, a display screen for displaying working state and data parameters, a state indicator lamp for state display and a terminal communication interface; the human-computer interaction module can be a touch screen and other devices and can be set according to requirements.

The hand-held operation terminal 6 is hand-held operation, small in size, light in weight, convenient to carry, and supports hot plug, and the human-computer interaction interface comprises button, display screen, status indicator lamp, RJ45 network interface. The button includes the up/down upset key, the numeral key, the function variable key, local/long-range switching key, display screen display operating condition and data parameter, the status indicator is yellow, green, red trichromatic is integrative, green represents the module 1 normal work that charges and instructs, yellow represents the module 1 alarm instruction that charges, red represents the module 1 fault indication that charges, RJ45 network interface passes through the data line and connects the module 1 the control unit 105 or the external interface of many module systems that charges, data transmission is stable, the interference killing feature is strong, can activate portable handheld operation panel through being connected with the control unit 105, need not to provide the control electricity alone again.

Further, the key includes a local/remote switch key for switching between a local mode and a remote mode, when the local/remote switch key is in the remote mode, the parameter of the charging module 1 is locked; when the local/remote switch key is in the local mode, the handheld operation terminal 6 can change the parameters of the charging module 1.

When the handheld operation terminal 6 is in communication connection with the single working state charging module 1, the working state of the charging module 1 can be reflected through the state indicating lamp, if a green lamp is normally on, the charging module 1 works normally, if a yellow lamp is normally on, the charging module 1 gives an alarm and can still work continuously, and if a red lamp is normally on, the charging module 1 stops outputting due to faults. When the charging module 1 is in an alarm or fault state, the handheld operation terminal 6 can accurately analyze and display specific alarm or fault codes and reasons through the display screen. In order to avoid the change and even loss of the control parameters of the charging module 1 caused by misoperation and other reasons, when all the parameters of the charging module 1 are locked and can not be modified when the local/remote switching key is in a remote mode, only the working parameters of the charging module 1 are allowed to be read; when the local/remote switch key is in the local mode, the temperature and output voltage parameters of the storage battery can be conveniently rewritten through the handheld operation terminal 6, and the storage batteries with different models and different multiplying powers can be charged. The output power of the charging module 1 can be changed by adjusting the rated current parameter of the charging module 1, so that the loss is reduced, and the power is supplied to loads with different powers. Adjusting the input and output voltage parameters may power circuits of different voltage classes. The control unit 105 reserves an I/O interface, and performs parameter setting through the handheld operation terminal 6 to expand a new function for the charging device, thereby meeting the requirements of different customers.

When the handheld operation terminal 6 is connected with a plurality of charging module 1 communication systems which output in parallel, the working state and parameter information of each charging module 1 in the system can be shared by the handheld operation terminal 6 connected in series (or in parallel). If all the charging modules 1 in the system work normally, the green lamp of the status indicator lamp is normally on, if any one of the charging modules 1 fails, the red lamp of the status indicator lamp is normally on, and the display screen displays the specific fault code and information of the charging module 1 corresponding to the address bit. If the parameter information of one of the charging modules 1 needs to be read, the charging module 1 is locked by inputting the address bit of the charging module 1 through the number keys before reading, rewriting or setting the parameters, the function variable key is clicked to enter a parameter interface of the charging module 1, and different control parameters and working output states are inquired through an up/down turning key, so that the same functions are realized.

When the handheld operation terminal 6 is connected with the charging module 1 (or a plurality of charging module 1 communication systems with parallel output), the display screen can actively display working parameters or fault information, the display screen can actively display information such as input voltage, output voltage and output current in a normal working state, and the display screen can actively display address bits, fault codes and specific fault information of the charging module 1 in a fault state (or one of the charging modules 1 has a fault), so that fault locking and judgment can be conveniently and rapidly carried out. Meanwhile, the portable handheld operation panel also has a storage and memory function, so that periodic cyclic storage is performed, the storage space is reduced, and the utilization rate of stored information is improved. Information screening can be performed through the combination of the display screen and the keys, and an operation/fault state trend graph is generated, so that information statistics and product RAMS analysis are facilitated.

When the working state of any one of the charging modules 1 in the system is inquired or monitored through the handheld operation terminal 6, the parameters of the charging module can be modified in a local mode, and meanwhile, the parameters of each charging module 1 in the system are updated without updating the control parameters of each charging module 1 one by one.

The handheld operation terminal 6 can be set as a PC, a tablet computer or other control terminals.

On the basis of the above embodiments, any charging module 1 further includes:

a cooling fan 106, a temperature acquisition unit for detecting the temperature of the charging module 1, and a current detection unit for detecting the current of the output circuit of the charging module 1, which are respectively connected with the control unit 105;

the control unit 105 controls the rotating speed of the cooling fan 106 according to the output power calculated by the detection temperature of the temperature acquisition unit and/or the detection current of the current detection unit;

when the detected temperature of the temperature acquisition unit is higher than the set temperature value and/or the output power is higher than the set output power, the control unit 105 controls the cooling fan 106 to increase the rotating speed;

when the detected temperature of the temperature acquisition unit is lower than the set temperature value and/or the output power is lower than the set output power, the control unit 105 controls the cooling fan 106 to reduce the rotating speed.

The cooling fan 106 is an EC fan, after the charging module 1 outputs the normal output, DC +/Bat-provides a working power supply for the cooling fan 106, and the cooling fan 106 is provided with a communication output interface, a sensor output interface, a speed regulation switch output interface and the like. Based on the temperature acquisition feedback of the temperature acquisition unit to the charging module 1 and the current acquisition feedback of the current detection unit to the output current of the charging module 1, the temperature acquisition unit is set as an NTC thermistor 107, and the current detection unit is a current sensor 108. The control unit 105 controls the start and stop of the cooling fan 106, and realizes real-time control of the rotating speed after the cooling fan 106 is started, so that the charging module 1 is high in heat dissipation control intelligence, energy conservation and efficiency.

Meanwhile, the temperature sampling feedback of the charging module 1 and the sampling feedback of the output current of the charging module 1 can be mutually prepared and complemented; when the temperature sampling of the charging module 1 fails or the NTC thermistor 107 fails, the control unit 105 may sample and feed back the output current of the charging module 1 according to the current sensor 108 to perform start-stop and rotational speed control on the cooling fan 106, when the control unit 105 calculates the output power of the charging module 1 through the output current to be higher or exceed the set power, the fan may be turned on and the rotational speed may be increased, and when the output power is lower or lower than the set power, the rotational speed of the cooling fan 106 may be decreased or the cooling fan 106 may be turned off; similarly, when the sampling feedback of the output current of the charging module 1 fails or the current sensor 108 fails, the control unit 105 may start, stop, and control the rotation speed of the cooling fan 106 according to the sampling feedback of the temperature of the charging module 1 by the NTC thermistor 107, and may start the fan and adjust the rotation speed faster when the temperature is higher or even exceeds a set value. When the temperature is lower or even lower than the set value, the rotation speed of the heat dissipation fan 106 can be reduced or the heat dissipation fan 106 can be turned off.

It can be understood that there is a corresponding relationship function between the temperature and the output power of the charging module 1 to realize intelligent, efficient and energy-saving control of the cooling fan 106.

On the basis of the above embodiments, the control unit 105 includes:

the input over-voltage and under-voltage control subunit is connected with the input unit of the three-phase power supply 2 and compares the input voltage of the input power supply of the three-phase power supply 2 with a preset input voltage range;

when the input voltage of the input power supply of the three-phase power supply 2 exceeds a preset input voltage range, sending an input over-voltage and under-voltage alarm signal to alarm, restarting the charging module 1, continuously judging whether the input voltage of the input power supply of the restarted three-phase power supply 2 exceeds the preset input voltage range, if so, cutting off power supply and sending the input over-voltage and under-voltage alarm signal to alarm; if not, the power is supplied normally.

It is understood that exceeding the preset input voltage range herein refers to a maximum value greater than the preset input voltage range and a minimum value less than the preset input voltage range. Therefore, the input over-voltage and under-voltage protection function is realized.

Further, the input over-voltage and under-voltage control subunit comprises:

the power supply circuit comprises a surge absorption circuit for absorbing or inhibiting oscillation voltage in a power supply line and/or a split-phase delay circuit for controlling delay connection of a circuit in a non-electricity area or a split-phase area, and a first comparator 7 respectively connected with the surge absorption circuit and/or the split-phase delay circuit;

the first comparator 7 compares the stable voltage of the surge absorption circuit and/or the passing split-phase delay circuit with a preset input voltage range, sends an input over-voltage and under-voltage alarm signal to alarm and restart the charging module 1 when the input voltage of the input power supply of the three-phase power supply 2 exceeds the preset input voltage range, and sends a starting signal to the second comparator 8;

the second comparator 8 continuously judges whether the input voltage of the input power supply of the three-phase power supply 2 exceeds a preset input voltage range, if so, the first-stage circuit-breaking protection circuit is triggered to cut off power supply and an input over-voltage and under-voltage alarm signal is sent to alarm; if not, the power is supplied normally.

The surge absorption circuit is composed of a bus inductor and an absorption capacitor in a series-parallel connection mode, and the split-phase delay circuit is composed of a delay relay and is used for controlling upward connection of the circuit in the no-area or split-phase interval. The input power supply is basically stable after passing through the surge absorption circuit and/or the passing split-phase delay circuit, the first comparator 7 obtains the stable voltage and compares the stable voltage with the preset input voltage range of the control unit 105, if the stable voltage fluctuates in the preset input voltage range, the power supply is normally supplied, and if not, the input over-voltage and under-voltage alarm signal is sent to alarm and restart the charging module 1.

The second comparator 8 continuously judges the voltage output by the alarm circuit and the voltage set by the control unit 105, if the voltage is recovered to the allowable fluctuation range, the power supply is normally supplied, if the voltage exceeds the allowable fluctuation range, a first-stage circuit-breaking protection circuit is triggered, the power supply is cut off, meanwhile, an over-voltage and under-voltage signal is sent to the control unit 105, after the first-stage circuit-breaking protection circuit is triggered, the power supply needs to be manually recovered, and the input over-voltage and under-voltage protection circuit can effectively prevent misoperation protection caused by excessive equality on the basis of voltage stabilization.

On the basis of the above embodiments, the control unit 105 further includes:

the over-under voltage control subunit 9 is connected with the output circuit of the charging module 1, and the over-under voltage control subunit 9 compares the output voltage of the output circuit of the charging module 1 with a preset output voltage range;

when the output voltage of the output circuit of the charging module 1 is smaller than the minimum value of the preset output voltage range, sending an output over-voltage and under-voltage alarm signal to alarm, restarting the charging module 1, repeatedly judging whether the output voltages of the output power supplies of the three-phase power supply 2 within the preset times are all smaller than the minimum value of the preset output voltage range, and if so, cutting off power supply and sending an output over-voltage and under-voltage alarm signal to alarm; if not, normally supplying power; the preset number of times may be set to three times.

The output under-voltage control subunit 9 includes:

the third comparator is used for comparing the output voltage of the output circuit of the charging module with a preset output voltage range, triggering the undervoltage alarm circuit to start when the output voltage of the output circuit of the charging module is smaller than the minimum value of the preset output voltage range, sending an output overvoltage and undervoltage alarm signal to the control unit to restart the charging module, and cutting off power supply and sending the output overvoltage and undervoltage alarm signal to alarm when the output voltage of the three-phase power supply output power supply within preset times is smaller than the minimum value of the preset output voltage range;

and when the output voltage of the output circuit of the charging module is larger than the maximum value of the preset output voltage range, the third comparator triggers the overvoltage power-off protection circuit to cut off power supply and sends an output overvoltage and undervoltage alarm signal to alarm.

When the output voltage of the output circuit of the charging module 1 is larger than the maximum value of the preset output voltage range, an over-voltage and under-voltage alarm signal is sent to alarm and the power supply is cut off.

The output over-under voltage control subunit 9 comprises an output under-voltage alarm circuit and an output over-voltage open-circuit protection circuit, based on the characteristic of permanent power supply of a storage battery load, the short-time low-voltage power supply of the charging module 1 has little influence on a direct-current bus, the output over-under voltage control subunit 9 acquires the output voltage of the charging module 1 and compares the output voltage with a voltage value set by the control unit 105, when the output voltage is lower than the voltage set value, the under-voltage alarm circuit sends an under-voltage alarm signal to the control unit 105, the control unit 105 sends a restart instruction of the charging module 1, and open-circuit protection is performed if the voltage is uniformly undervoltage after; when the output voltage is higher than the set value, the overvoltage open-circuit protection circuit sends an overvoltage signal to the control unit 105, and the control unit 105 sends an open-circuit protection instruction and needs manual recovery.

Specifically, the control unit 105 further includes:

and the overcurrent control subunit is connected with the current detection unit, compares the output current detected by the current detection unit with a preset current value, controls the charging module 1 to restart when the output current of the current detection unit is greater than or equal to the preset current value, repeatedly judges whether the output current detected by the current detection unit within preset times is greater than or equal to the preset current value, and uploads a current fault signal to the upper computer if the output current is greater than or equal to the preset current value.

The overcurrent control subunit compares the output current detected by the current detection unit with a preset current value;

the overcurrent control subunit includes:

and the fourth comparator controls the charging module to restart when the output current of the current detection unit is greater than or equal to a preset current value, and uploads a current fault signal to the upper computer when the output current detected by the current detection unit within preset times is repeatedly judged to be greater than or equal to the preset current value.

According to the characteristic of large short-circuit current, the control unit 105 of the charging module 1 sets a protection mode combining short-circuit protection and overcurrent protection, the output current is sampled by the current sensor 108 and compared with the current value set by the control unit 105, if the current value exceeds the set current value, the overcurrent protection function is triggered, the control unit 105 sends a restart signal for 3 times, if the output current or the short circuit is recovered to be normal during the restart, the fault disappears, and if the output current still exceeds the preset current value after 3 times of restart, the control unit 105 does not send the restart signal any more and uploads the fault signal to a vehicle terminal or display equipment.

On the basis of the above embodiments, the control unit 105 further includes:

and the shutdown self-locking control subunit controls the charging module 1 to restart after receiving the fault signal, and respectively cuts off the connection between the input unit of the three-phase power supply 2 and the connection between the power unit and the load and sends the fault signal and the load shedding request signal to the upper computer when the charging module 1 fails to restart twice.

When the single charging module 1 system normally works, the control unit 105 uploads the OK feedback signal to the vehicle terminal or the display device through the communication system. When a fault occurs, the charging module 1 is automatically restarted twice, if the charging module can be successfully started and normally works in the self-starting process, the charging module 1 feeds back the restart reason through network communication; when the automatic restarting fails for two times, the control unit 105 of the charging module 1 does not send out a starting signal any more, activates the shutdown self-locking function and sends out a fault signal and a load shedding request signal at the same time, and feeds back the fault signal and the load shedding request signal to a vehicle terminal or display equipment through network communication, so that the load power is reduced or the power supply of an emergency storage battery and a shared train bus power supply are started.

In the parallel system of the charging modules 1, an input three-phase alternating current main power supply respectively supplies power to each charging module 1 in a parallel mode, and an output direct current power supply is connected in parallel to supply power to a storage battery or other loads. When the charging system works normally, each control unit 105 of the charging module 1 only sends a normal working feedback signal, when one or more charging modules 1 have faults, the control unit 105 activates the shutdown self-locking function and simultaneously cuts off the main electrical connection between the charging module 1 and an input end and the connection between an output end and a load, the control unit 105 sends a fault signal and a load shedding request signal, and the fault signal and the load shedding request signal are fed back to a vehicle terminal or display equipment through a communication system, a train mechanic or crew member can determine whether to shed the load or even start the emergency power supply of a storage battery according to the vehicle terminal and/or the displayed load current, and simultaneously lock the fault charging module 1 according to the fed back fault signal, and other charging modules 1 in the system keep normal power supply unaffected. Because the first communication interface 4 and the second communication interface 5 of each charging module 1 are in a master-slave series connection relationship, when one or more charging modules 1 are in fault, the communication of the system can not be interrupted, and the vehicle control terminal can still normally communicate and transmit with the external communication transmission through the unified external communication transmission.

The number of the charging modules 1 is selected according to the actual working condition, and a unique code is set for each charging module 1 according to the description of fig. 5. After the storage battery type and the charging temperature compensation characteristic are determined, the control parameter of the charging module 1 is modified and confirmed by using the handheld operation terminal 6, and meanwhile, the corresponding relation parameter of the cooling fan 106 of the charging module 1, the module temperature and the output power is set, so that the intelligent, efficient and energy-saving control of the cooling fan 106 is realized. According to fig. 6, the communication connection of the parallel combination system of the multiple charging modules 1 is completed, and the power can be switched on after the connection of the input and output parallel circuits is completed.

The device adopts the mode that natural air cooling and forced air cooling combine together, and is concrete, and every module 1 configuration EC fan that charges combines NTC temperature sampling and output current sampling feedback to the module 1 that charges, controls opening of fan and stops and realizes the best rotational speed to reach ideal radiating effect, realize the high intelligence of forced air cooling control, high energy-conserving and high efficiency. In order to adapt to and meet the temperature compensation charging of different types of storage batteries, the method that a traditional circuit board software is solidified and needs a dismounting machine is abandoned, the handheld operation terminal 6 is connected with the DSP digital signal control unit 105 through the RJ45 network interface, and the control parameters including the output voltage and the temperature parameters of the storage batteries can be modified conveniently and quickly. In order to avoid program confusion caused by misoperation, the handheld operation terminal 6 is also provided with local control and remote monitoring options, parameters can be modified only in a local control mode, and meanwhile, the handheld operation terminal 6 also replaces the function of service software and can inquire the working state and fault information of the charging module 1. According to different actual working conditions and loads, the parallel connection output of the charging modules 1 can be realized to enlarge the capacity, unified communication transmission and centralized storage battery temperature acquisition are realized, and the synchronous change of the output voltages of all the charging modules 1 is realized.

Finally, it should also be 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 an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

Claims

1. The utility model provides a charging device, includes the module of charging, the module of charging include the control unit, respectively with battery temperature acquisition unit that the control unit is connected, be used for the three-phase current input unit who is connected with three-phase current and be used for providing the power unit of power for battery and direct current bus, its characterized in that:

the number of the charging modules is at least two, the three-phase power supply input units of the charging modules are connected in parallel for input, the power units are connected in parallel for output, and the charging modules are in communication connection;

2. The charging device according to claim 1, wherein any one of the charging modules includes at least two communication interfaces, one communication interface of the charging module at a head end of all the charging modules is connected to an external device for external communication, and one communication interface of the charging module at a tail end of all the charging modules is connected to a terminal resistor for terminating communication.

3. The charging device according to claim 1, further comprising:

4. A charging arrangement as claimed in any of claims 1 to 3, in which any of the charging modules further comprises:

5. A charging device as claimed in any one of claims 1 to 3, wherein any one of said control units comprises:

6. The charging device of claim 5, wherein the input brown-out control subunit comprises:

7. A charging device as claimed in any one of claims 1 to 3, wherein any one of said control units further comprises:

8. The charging device according to claim 7, wherein any of the control units further comprises:

9. A charging device as claimed in any one of claims 1 to 3, wherein any one of said control units further comprises:

10. A charging arrangement as claimed in claim 3, in which the terminal communication interface is an RJ45 network interface.