DC charger circuit

Abstract

The utility model provides a direct current charger circuit. The circuit comprises a dehumidification and heat dissipation module, a monitoring control module and a charging module, the monitoring control module is connected with the charging module and the dehumidification and heat dissipation module. The charging module is used for converting an external alternating current power supply voltage into a direct current voltage and outputting the direct current voltage; the monitoring control module is used for monitoring the humidity and temperature in the charging module, enabling the dehumidification and heat dissipation module to dehumidify the charging module according to the humidity, and enabling the dehumidification and heat dissipation module to dissipate heat of the charging module according to the temperature; the humidity in the charging module is monitored through the monitoring control module, and the dehumidification and heat dissipation module is controlled to dehumidify the charging module according to the monitored humidity, so that the humidity in the charging module can be effectively prevented from being too high, and the stability and the safety of the circuit of the direct current charger are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of direct current chargers, in particular to a direct current charger circuit. Background Art

[0002] With the rapid development of new energy vehicles, electric vehicles have become popular, and electric vehicle chargers have emerged. The charger works outdoors for a long time. When encountering windy and rainy weather, especially typhoon days, rainwater will enter the charging module of the charger through the heat dissipation inlet and outlet of the charger under the influence of crosswind, causing the humidity inside the charging module to increase. In addition, the "return of the south wind" in the south will also increase the humidity inside the charging module. In the above cases, if the interior of the charging module is not dehumidified in time, the circuit inside the charging module will malfunction or even short-circuit and explode, affecting the stability and safety of the charger, reducing the service life of the charger, and also increasing the subsequent maintenance costs. The charger circuit of the prior art does not support the dehumidification function inside the charging module. Utility Model Content

[0003] The utility model aims to provide a DC charger circuit to solve the technical problem that the charger circuit in the prior art cannot dehumidify the inside of the charging module.

[0004] The technical solution of the utility model is as follows, providing a DC charger circuit, including a dehumidification and heat dissipation module, a monitoring and control module and a charging module;

[0005] The monitoring and control module is connected to the charging module and the dehumidification and heat dissipation module respectively;

[0006] The charging module is used to convert the external AC power supply voltage into a DC voltage and output the DC voltage;

[0007] The monitoring and control module is used to monitor the humidity and temperature inside the charging module, and to enable the dehumidification and heat dissipation module to dehumidify the charging module according to the humidity, and to enable the dehumidification and heat dissipation module to dissipate heat from the charging module according to the temperature.

[0008] Preferably, the monitoring control module includes a temperature and humidity transmitter, a monitoring unit, a charging control unit and a terminal control unit, the temperature and humidity transmitter is connected to a first end of the monitoring unit, the second end of the monitoring unit is connected to a first end of the charging control unit, and the second end of the charging control unit is connected to a first end of the terminal control unit;

[0009] The dehumidification and heat dissipation module includes a relay and a dehumidification and heat dissipation fan, the first end of the relay is connected to an external AC power supply, the second end of the relay is connected to the dehumidification and heat dissipation fan, and the third end of the relay is connected to the third end of the monitoring unit.

[0010] Preferably, the charging module includes at least one charging gun, each of the charging guns is correspondingly connected to a DC meter, a first DC contactor, a fuse and an AC / DC conversion unit, and the output power of the external AC power supply is output to the charging gun through the AC / DC conversion unit, the fuse, the first DC contactor and the DC meter.

[0011] Preferably, the third terminal of the charging control unit is connected to the first DC contactor.

[0012] Preferably, the second end of the terminal control unit is connected to a card reader, and the output end of the DC meter is connected to the sixth end of the charging control unit.

[0013] Preferably, it is characterized in that the charging module includes a first AC circuit breaker, an AC meter and an AC contactor, the first end of the first AC circuit breaker is connected to the external AC power supply, the second end of the first AC circuit breaker is connected to the first end of the AC meter, the third end of the AC circuit breaker is connected to the fourth end of the monitoring unit, the second end of the AC meter is connected to the first end of the AC contactor, the third end of the AC meter is connected to the fifth end of the monitoring unit, the second end of the AC contactor is connected to the first end of the AC / DC conversion unit, and the third end of the AC contactor is connected to the sixth end of the monitoring unit.

[0014] Preferably, the monitoring control module includes an emergency stop unit and an access control unit, and the emergency stop unit and the access control unit are respectively connected to the fourth end and the fifth end of the charging control unit.

[0015] Preferably, the charging module further includes a first power bus and a second power bus, the second end of the AC / DC conversion unit is connected to the first power bus, and the third end of the AC / DC conversion unit is connected to the second power bus.

[0016] Preferably, the AC / DC conversion unit includes a first AC / DC conversion unit and a second AC / DC conversion unit, the second end of the AC contactor is respectively connected to the first end of the first AC / DC conversion unit and the first end of the second AC / DC conversion unit, the second end of the first AC / DC conversion unit and the second end of the second AC / DC conversion unit are respectively connected to the first power bus, the third end of the first AC / DC conversion unit and the third end of the second AC / DC conversion unit are respectively connected to the second power bus, a second DC contactor is provided on the first power bus, and a third DC contactor is provided on the second power bus, the first end of the second DC contactor is connected to the second end of the first AC / DC conversion unit, and the second end of the second DC contactor is connected to the second end of the second AC / DC conversion unit; the first end of the third DC contactor is connected to the third end of the first AC / DC conversion unit, the second end of the third DC contactor is connected to the third end of the second AC / DC conversion unit, and the seventh end of the monitoring unit is respectively connected to the third end of the third DC contactor and the third end of the second DC contactor.

[0017] Preferably, a second AC circuit breaker is provided between the first end of the relay and the external AC power supply.

[0018] The beneficial effect of the utility model is that by monitoring the humidity inside the charging module through the monitoring control module, and controlling the dehumidification and heat dissipation module to dehumidify the charging module according to the monitored humidity, the humidity inside the charging module can be effectively prevented from being too high, thereby increasing the stability and safety of the DC charger circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A first structural block diagram of a DC charger circuit provided by an embodiment of the utility model;

[0020] Figure 2 A circuit schematic diagram of a DC charger circuit provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0023] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0025] Figure 1 is a first structural block diagram of a DC charger circuit provided by an embodiment of the present utility model. It should be noted that if there is substantially the same result, the present utility model is not based on Figure 1 The structure shown is limited. Figure 1 As shown, the DC charger circuit includes a dehumidification and heat dissipation module 10, a monitoring and control module 20 and a charging module 30;

[0026] The monitoring and control module 20 is connected to the charging module 30 and the dehumidification and heat dissipation module 10 respectively;

[0027] The charging module 30 is used to convert the external AC power supply voltage into a DC voltage and output the DC voltage;

[0028] The monitoring and control module 20 is used to monitor the humidity and temperature inside the charging module 30, and to enable the dehumidification and heat dissipation module 10 to dehumidify the charging module 30 according to the humidity, and to enable the dehumidification and heat dissipation module 10 to dissipate heat from the charging module 30 according to the temperature.

[0029] In the embodiment of the utility model, by monitoring the humidity inside the charging module 30 through the monitoring control module 20, and controlling the dehumidification and heat dissipation module 10 to perform a dehumidification operation on the charging module 30 according to the monitored humidity, the humidity inside the charging module 30 can be effectively prevented from being too high, thereby increasing the stability and safety of the DC charger circuit; by monitoring the temperature inside the charging module 30 through the monitoring control module 20, and controlling the dehumidification and heat dissipation module 10 to perform a heat dissipation operation on the charging module 30 according to the monitored temperature, the temperature inside the charging module 30 can be effectively prevented from being too high, thereby further increasing the stability and safety of the DC charger circuit.

[0030] In a specific embodiment, the charging module 30 includes a cabinet with a heat dissipation port. The circuit structure of the charging module 30, the dehumidification and heat dissipation module 10, and the monitoring and control module 20 are all arranged inside the cabinet. When the dehumidification and heat dissipation module 10 dehumidifies or dissipates heat for the charging module 20, it actually dehumidifies or dissipates heat for the entire DC charger circuit.

[0031] In some embodiments, the circuit schematic diagram of the DC charger circuit is as follows: Figure 2 As shown, the monitoring control module 20 includes a temperature and humidity transmitter, a monitoring unit MNU, a charging control unit CCUA and a terminal control unit TCU, the temperature and humidity transmitter is connected to a first end of the monitoring unit MNU, the second end of the monitoring unit MNU is connected to a first end of the charging control unit CCUA, and the second end of the charging control unit CCUA is connected to a first end of the terminal control unit TCU;

[0032] The dehumidification and heat dissipation module 10 includes a relay KA-NO and a dehumidification and heat dissipation fan. The first end of the relay KA-NO is connected to an external AC power supply, the second end of the relay KA-NO is connected to the dehumidification and heat dissipation fan, and the third end of the relay KA-NO is connected to the third end of the monitoring unit MNU.

[0033] In this embodiment, the temperature and humidity transmitter is used to detect the real-time temperature and humidity inside the charging module 30, and send the real-time temperature and humidity data to the monitoring unit MNU through the RS485 protocol. The monitoring unit MNU reports the real-time temperature and humidity data to the terminal control unit TCU through CAN communication. The terminal control unit TCU compares and analyzes the real-time temperature and humidity data. When the real-time humidity exceeds the preset humidity threshold and / or the real-time temperature exceeds the preset temperature threshold, the terminal control unit TCU sends a dehumidification and / or heat dissipation instruction to the monitoring unit MNU. The monitoring unit MNU controls the electromagnetic coil of the relay KA-NO to close the signal path of the connecting contact of the relay KA-NO, thereby energizing the dehumidification and heat dissipation fan.

[0034] In a specific embodiment, the second end of the terminal control unit TCU is also connected to a human-machine interactive touch screen LCD via RS232 communication, and the human-machine interactive touch screen LCD can display real-time temperature and humidity. The human-machine interactive touch screen LCD is provided with a manual dehumidification button, and by clicking the manual dehumidification button, the dehumidification cooling fan can be actively turned on to actively dehumidify the inside of the charging module 30. When the real-time humidity value collected on the human-machine interactive touch screen LCD meets the requirements, the stop dehumidification button on the human-machine interactive touch screen LCD is manually clicked to complete the dehumidification.

[0035] In some embodiments, Figure 2 As shown, the charging module 30 includes at least one charging gun, each of which is connected to a DC meter PJA, a first DC contactor KMA1, a fuse FU1 and an AC / DC conversion unit. The output power of the external AC power supply is output to the charging gun through the AC / DC conversion unit, the fuse FU1, the first DC contactor KMA1 and the DC meter PJA.

[0036] In this embodiment, the AC / DC converter is used to convert the input AC voltage of the external AC power supply into a DC voltage, the fuse FU1 is used for short circuit and overcurrent protection, and the switching state of the first DC contactor KMA1 determines whether the charging gun outputs voltage.

[0037] In some embodiments, Figure 2 As shown, the third terminal of the charging control unit CCUA is connected to the first DC contactor KMA1.

[0038] In this embodiment, the charging control unit CCUA controls whether the charging gun outputs voltage by controlling the switching state of the first DC contactor KMA1.

[0039] In a specific embodiment, when there are multiple charging guns in the charging module 30, the number of charging control units corresponds to the number of charging guns, that is, each charging control unit independently controls a charging gun line.

[0040] In some embodiments, Figure 2 As shown, the second end of the terminal control unit TCU is connected to the card reader DKQ, and the output end of the DC meter PJA is connected to the sixth end of the charging control unit CCUA.

[0041] In this embodiment, the card reader DKQ is connected to the terminal control unit TCU via RS232 communication. The user can interact with the terminal control unit TCU through the card reader DKQ. When the terminal control unit TCU detects that the user swipes the card, the terminal control unit TCU sends a charging signal to the charging control unit CCUA. The charging control unit CCUA controls the first DC contactor KMA1 to close according to the charging signal so that the charging gun outputs voltage.

[0042] In some embodiments, Figure 2 As shown, the charging module 30 includes a first AC circuit breaker 1QF, an AC meter PJ1 and an AC contactor 1KM, wherein a first end of the first AC circuit breaker 1QF is connected to the external AC power supply, a second end of the first AC circuit breaker 1QF is connected to a first end of the AC meter PJ1, a third end of the AC circuit breaker is connected to a fourth end of the monitoring unit MNU, a second end of the AC meter PJ1 is connected to a first end of the AC contactor 1KM, a third end of the AC meter PJ1 is connected to a fifth end of the monitoring unit MNU, a second end of the AC contactor 1KM is connected to a first end of the AC / DC conversion unit, and a third end of the AC contactor 1KM is connected to a sixth end of the monitoring unit MNU.

[0043] In this embodiment, the monitoring unit MNU controls the switch status of the first AC circuit breaker 1QF and the AC contactor 1KM through remote signaling, and the AC meter PJ1 communicates with the monitoring unit MNU through the RS485 protocol. The first AC circuit breaker 1QF is used to cut off the current when a line fault occurs to prevent the DC charger circuit from being damaged, and to protect other equipment from the impact of the fault current. In addition, the circuit breaker can also play the role of disconnecting and connecting the circuit, which is convenient for controlling and debugging the circuit. The AC contactor 1KM is used to control the on and off of the circuit. The AC meter PJ1 is used to monitor real-time data in the DC charger circuit.

[0044] In some embodiments, Figure 2 As shown, the monitoring control module 20 includes an emergency stop unit and an access control unit, and the emergency stop unit and the access control unit are respectively connected to the fourth terminal and the fifth terminal of the charging control unit CCUA.

[0045] In this embodiment, the emergency stop unit includes an emergency stop button. When a fault occurs in the DC charger circuit, the emergency stop button is pressed, and the emergency stop unit sends a shutdown signal to the charging control unit CCUA. The charging control unit CCUA sends the shutdown signal to the monitoring unit MNU. The monitoring unit MNU controls the first AC circuit breaker 1QF to disconnect, thereby quickly cutting off the input of the external AC power supply to avoid further danger or greater losses. The access control unit is used to send a shutdown signal to the charging control unit CCUA when the charging cabinet door where the DC charger circuit is located is opened due to normal maintenance or unexpected circumstances. The charging control unit CCUA sends the shutdown signal to the monitoring unit MNU. The monitoring unit MNU controls the first AC circuit breaker 1QF to disconnect, thereby quickly cutting off the input of the external AC power supply to avoid the risk of electric shock to personnel.

[0046] In some embodiments, Figure 2 As shown, the charging module 30 also includes a first power bus BSU1+ and a second power bus BSU1-, the second end of the AC / DC conversion unit is connected to the first power bus BSU1+, and the third end of the AC / DC conversion unit is connected to the second power bus BSU1-.

[0047] In this embodiment, the AC / DC conversion unit includes at least one AC / DC converter, the second end of the AC / DC conversion unit can be the positive pole of the AC / DC converter, and the third end of the AC / DC conversion unit can be the negative pole of the AC / DC converter. The at least one AC / DC converter transmits the converted DC current to at least one charging gun through the fuse FU1 and the DC contactor.

[0048] In some embodiments, Figure 2As shown, the AC / DC conversion unit includes a first AC / DC conversion unit and a second AC / DC conversion unit, the second end of the AC contactor 1KM is respectively connected to the first end of the first AC / DC conversion unit and the first end of the second AC / DC conversion unit, the second end of the first AC / DC conversion unit and the second end of the second AC / DC conversion unit are respectively connected to the first power bus BSU1+, the third end of the first AC / DC conversion unit and the third end of the second AC / DC conversion unit are respectively connected to the second power bus BSU1-, the first power bus BSU1+ is provided with a second DC contactor KMAB1, the first power bus BSU1+ is provided with a second DC contactor KMAB2, the first AC / DC conversion unit and the second AC / DC conversion unit are respectively connected to the first power bus BSU1+, the second end of the AC / DC conversion unit and the second end of the second AC / DC conversion unit are respectively connected to the first power bus BSU1-, the first power bus BSU1+ is provided with a second DC contactor KMAB1 ...2, the first AC / DC conversion unit and the second AC / DC conversion unit are respectively connected to the first power bus BSU1+, the second end of the AC / DC conversion unit and the second end of the second AC / DC conversion unit are respectively connected to the first power bus BSU1-, the first power bus BSU1+ is provided with a second DC contactor A third DC contactor KMAB2 is provided on the second power bus BSU1-, the first end of the second DC contactor KMAB1 is connected to the second end of the first AC / DC conversion unit, and the second end of the second DC contactor KMAB1 is connected to the second end of the second AC / DC conversion unit; the first end of the third DC contactor KMAB2 is connected to the third end of the first AC / DC conversion unit, and the second end of the third DC contactor KMAB2 is connected to the third end of the second AC / DC conversion unit, and the seventh end of the monitoring unit MNU is respectively connected to the third end of the third DC contactor KMAB2 and the third end of the second DC contactor KMAB1.

[0049] In this embodiment, each AC / DC conversion unit corresponds to a charging gun. When only one charging gun needs to work, the output voltage of the first AC / DC conversion unit and the second AC / DC conversion unit is output to the charging gun that needs to work through the first power bus BSU1+ by closing the second DC contactor KMAB1 and the third DC contactor KMAB2, so as to maximize the output power. When both charging guns need to work, the first DC contactor KMA1 and the second DC contactor KMAB1 are disconnected so that both charging guns can work normally.

[0050] In a specific embodiment, the user sends a charging signal to the terminal control unit TCU through the card reader DKQ, and the terminal control unit TCU sends the charging signal to the charging control unit CCUA. The charging control unit CCUA directly sends a shutdown signal to the first DC contactor KMA1, and closes the second DC contactor KMAB1 and the third DC contactor KMAB2 through the monitoring unit MNU. At this time, the output voltages of the first AC / DC conversion unit and the second AC / DC conversion unit are both transmitted to a charging gun, so that the user can complete charging quickly, saving charging time and improving charging efficiency.

[0051] In some embodiments, Figure 2 As shown, a second AC circuit breaker QF01 is provided between the first end of the relay KA-NO and the external AC power supply.

[0052] In this embodiment, the second AC circuit breaker QF01 is used to cut off the current when a line fault occurs to prevent the dehumidification and cooling fan from being damaged.

[0053] The above is only an implementation method of the present invention. It should be pointed out that a person skilled in the art can make improvements without departing from the inventive concept of the present invention, but these improvements are all within the protection scope of the present invention.

Claims

1. A DC charger circuit, characterized in that: It includes a dehumidification and heat dissipation module, a monitoring and control module, and a charging module; The monitoring and control module is connected to the charging module and the dehumidification and heat dissipation module respectively; The charging module is used to convert the external AC power supply voltage into a DC voltage and output the DC voltage; The monitoring and control module is used to monitor the humidity and temperature inside the charging module, and to enable the dehumidification and heat dissipation module to dehumidify the charging module according to the humidity, and to enable the dehumidification and heat dissipation module to dissipate heat from the charging module according to the temperature.

2. The DC charger circuit according to claim 1, characterized in that: The monitoring control module includes a temperature and humidity transmitter, a monitoring unit, a charging control unit and a terminal control unit, wherein the temperature and humidity transmitter is connected to a first end of the monitoring unit, a second end of the monitoring unit is connected to a first end of the charging control unit, and a second end of the charging control unit is connected to a first end of the terminal control unit; The dehumidification and heat dissipation module includes a relay and a dehumidification and heat dissipation fan, the first end of the relay is connected to an external AC power supply, the second end of the relay is connected to the dehumidification and heat dissipation fan, and the third end of the relay is connected to the third end of the monitoring unit.

3. The DC charger circuit according to claim 2, characterized in that: The charging module includes at least one charging gun, each of which is connected to a DC meter, a first DC contactor, a fuse and an AC / DC conversion unit. The output power of the external AC power supply is output to the charging gun through the AC / DC conversion unit, the fuse, the first DC contactor and the DC meter.

4. The DC charger circuit according to claim 3, characterized in that: The third terminal of the charging control unit is connected to the first DC contactor.

5. The DC charger circuit according to claim 3, characterized in that: The second end of the terminal control unit is connected to a card reader, and the output end of the DC meter is connected to the sixth end of the charging control unit.

6. The DC charger circuit according to claim 3, characterized in that: The charging module includes a first AC circuit breaker, an AC meter and an AC contactor, wherein a first end of the first AC circuit breaker is connected to the external AC power supply, a second end of the first AC circuit breaker is connected to a first end of the AC meter, a third end of the AC circuit breaker is connected to a fourth end of the monitoring unit, a second end of the AC meter is connected to a first end of the AC contactor, a third end of the AC meter is connected to a fifth end of the monitoring unit, a second end of the AC contactor is connected to a first end of the AC / DC conversion unit, and a third end of the AC contactor is connected to a sixth end of the monitoring unit.

7. The DC charger circuit according to claim 6, characterized in that: The monitoring control module includes an emergency stop unit and an access control unit, and the emergency stop unit and the access control unit are respectively connected to the fourth end and the fifth end of the charging control unit.

8. The DC charger circuit according to claim 6, characterized in that: The charging module further includes a first power bus and a second power bus, the second end of the AC / DC conversion unit is connected to the first power bus, and the third end of the AC / DC conversion unit is connected to the second power bus.

9. The DC charger circuit according to claim 8, characterized in that: The AC / DC conversion unit includes a first AC / DC conversion unit and a second AC / DC conversion unit, the second end of the AC contactor is respectively connected to the first end of the first AC / DC conversion unit and the first end of the second AC / DC conversion unit, the second end of the first AC / DC conversion unit and the second end of the second AC / DC conversion unit are respectively connected to the first power bus, the third end of the first AC / DC conversion unit and the third end of the second AC / DC conversion unit are respectively connected to the second power bus, a second DC contactor is provided on the first power bus, and a third DC contactor is provided on the second power bus, the first end of the second DC contactor is connected to the second end of the first AC / DC conversion unit, and the second end of the second DC contactor is connected to the second end of the second AC / DC conversion unit; the first end of the third DC contactor is connected to the third end of the first AC / DC conversion unit, the second end of the third DC contactor is connected to the third end of the second AC / DC conversion unit, and the seventh end of the monitoring unit is respectively connected to the third end of the third DC contactor and the third end of the second DC contactor.

10. The DC charger circuit according to claim 2, characterized in that: A second AC circuit breaker is provided between the first end of the relay and the external AC power supply.

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