CN218940744U - High-power direct-current charging device and charging system - Google Patents

Abstract

The utility model discloses a high-power direct current charging device and a charging system, wherein the high-power direct current charging device comprises an input module, a rectifier, an output module and a controller, the input end of the input module is connected with three-phase alternating current, the output end of the input module is connected with the input end of the rectifier, the connected three-phase alternating current is safely controlled through the input module so as to ensure the safety of the three-phase alternating current output to the rectifier, the output end of the rectifier is connected with the input end of the output module, the output end of the output module is used for outputting direct current, the conversion from alternating current to direct current is carried out through the rectifier, the output capability of the charging system can be improved, the charging time of an electric automobile is greatly shortened, the charging state of the direct current output to the electric automobile by the rectifier is effectively controlled through the output module, and meanwhile, the control module is connected with the rectifier through a PWM interface to effectively control the charging efficiency of the electric automobile, so that the stability and the safety of the operation of the charging system are ensured.

Description

High-power direct-current charging device and charging system

Technical Field

The utility model relates to the technical field of charging systems, in particular to a high-power direct-current charging device and a charging system.

Background

In recent years, the amount of automobile maintenance in China is continuously increasing, and the corresponding requirement for charging infrastructure is also continuously increasing, but at present, the existing high-power charging mode for electric automobiles is a direct current charging mode.

At present, a direct current charging device with a DC/DC module is generally adopted in the market to charge an electric automobile, however, the charging efficiency is low and the charging time is long due to the existence of the DC/DC module, so that the requirement of quick charging of the electric automobile cannot be met.

Disclosure of Invention

The utility model mainly aims to provide a high-power direct-current charging device and a charging system, and aims to solve the technical problem that the existing charging infrastructure cannot meet the requirement of high-power quick charging of an electric automobile.

In order to achieve the above object, the present utility model provides a high-power direct current charging device, which includes an input module, a rectifier, an output module and a control module;

the input end of the input module is connected with three-phase alternating current, the output end of the input module is connected with the input end of the rectifier, the output end of the rectifier is connected with the input end of the output module, the output end of the output module is used for outputting direct current, and the control module is connected with the rectifier in a communication way through a PWM interface.

Optionally, the input module comprises a surge protection unit, and the surge protection unit is connected with the three-phase alternating current;

the surge protection unit comprises a first TVS tube, a second TVS tube and a third TVS tube;

the positive electrode of the first TVS tube is connected with a first phase alternating current power supply of the three-phase alternating current, the positive electrode of the second TVS tube is connected with a second phase alternating current power supply of the three-phase alternating current, and the positive electrode of the third TVS tube is connected with a third phase alternating current power supply of the three-phase alternating current.

Optionally, the input module further comprises a circuit breaker;

the first input end of the circuit breaker is connected with the negative electrode of the first TVS tube, the second input end of the circuit breaker is connected with the negative electrode of the second TVS tube, and the third input end of the circuit breaker is connected with the negative electrode of the third TVS tube.

Optionally, the input module further comprises a power filter, and the power filter is connected between the circuit breaker and the rectifier;

the power supply filter comprises a first piezoresistor, a second piezoresistor, a first inductor, a second inductor, a third inductor, a fourth inductor, a common mode inductor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor and a sixth capacitor;

the second end of the first inductor is connected with the first end of the second inductor, the first end of the first inductor is connected with the first output end of the circuit breaker, and the second end of the second inductor is connected with the first end of the common mode inductor;

the second end of the third inductor is connected with the first end of the fourth inductor, the first end of the third inductor is connected with the third output end of the circuit breaker, and the second end of the fourth inductor is connected with the second end of the common mode inductor;

the first piezoresistor and the second piezoresistor are connected between the first end of the first inductor and the first end of the third inductor in series, the first capacitor and the second capacitor are connected between the first end of the first inductor and the first end of the third inductor in series, the third capacitor and the fourth capacitor are connected between the second end of the first inductor and the second end of the third inductor in series, and the second output end of the circuit breaker is connected to the connection point of the third capacitor and the fourth capacitor through the connection point of the first piezoresistor and the second piezoresistor and the connection point of the first capacitor and the second capacitor;

the fifth capacitor is connected between the second end of the second inductor and the second end of the fourth inductor, and the sixth capacitor is connected between the third end of the common-mode inductor and the fourth end of the common-mode inductor;

and the third end of the common-mode inductor and the fourth end of the common-mode inductor are connected to the input end of the rectifier.

Optionally, the rectifier includes: a first thyristor, a second thyristor, a third thyristor, a fourth thyristor, and a load;

the third end of the common-mode inductor is connected to a connection point of the positive electrode of the first thyristor and the negative electrode of the second thyristor, and the fourth end of the common-mode inductor is connected to a connection point of the positive electrode of the third thyristor and the negative electrode of the fourth thyristor;

the negative electrode of the first thyristor and the negative electrode of the third thyristor are connected to the first end of the load together, the positive electrode of the second thyristor and the positive electrode of the fourth thyristor are connected to the second end of the load together, and the output end of the load is connected with the input end of the output module;

the load comprises a resistive load, an inductive load, or a back emf load.

Optionally, the output module includes a dc filter;

the input end of the direct current filter is connected with the output end of the rectifier.

Optionally, the output module further comprises a direct current contactor;

the input end of the direct current contactor is connected with the output end of the direct current filter, the control end of the direct current contactor is in communication connection with the control module, and the output end of the direct current contactor is used for outputting direct current.

Optionally, the control module includes a controller;

the controller adopts a controller with the model STM 32;

and the PWM interface of the controller is in communication connection with the rectifier, and the controller is in communication connection with the control end of the direct current contactor.

Optionally, the control module further comprises a sampling unit;

the input end of the sampling unit is connected to the output end of the direct current contactor, and the output end of the sampling unit is connected to the controller.

In addition, in order to achieve the above object, the present utility model also provides a charging system, which includes the high-power direct-current charging device as described above, the high-power direct-current charging device including an input module, a rectifier, an output module, and a control module;

the input end of the input module is connected with three-phase alternating current, the output end of the input module is connected with the input end of the rectifier, the output end of the rectifier is connected with the input end of the output module, the output end of the output module is used for outputting direct current, and the control module is connected with the rectifier in a communication way through a PWM interface.

The utility model provides a high-power direct current charging device and a charging system, wherein the high-power direct current charging device comprises an input module, a rectifier, an output module and a controller, the input end of the input module is connected with three-phase alternating current, the output end of the input module is connected with the input end of the rectifier, the connected three-phase alternating current is safely controlled through the input module so as to ensure the safety of the three-phase alternating current output to the rectifier, the output end of the rectifier is connected with the input end of the output module, the output end of the output module is used for outputting direct current, the conversion from alternating current to direct current is carried out through the rectifier, the output capability of the charging system can be improved, the charging time of an electric automobile is greatly shortened, the charging state of the direct current output to the electric automobile by the rectifier is effectively controlled through the output module, and meanwhile, the control module is connected with the rectifier through a PWM interface to effectively control the charging efficiency of the electric automobile, so that the stability and the safety of the operation of the charging system are ensured.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a high power DC charging device according to the present utility model;

FIG. 2 is a schematic diagram of a power filter according to the present utility model;

fig. 3 is a schematic circuit diagram of a rectifier according to the present utility model.

Reference numerals illustrate:

reference numerals	Name of the name	Reference numerals	Name of the name
				10	Input module	100	Controller for controlling a power supply
20	Rectifier device	110	Sampling unit
				30	Output module	TVS1-TVS3	TVS tube
40	Control module	R1-R2	Piezoresistor
				50	Surge protection unit	L1-L4	Inductance
60	Circuit breaker	L5	Common mode inductance
				70	Power supply filter	C1-C6	Capacitance device
80	DC filter	D1-D4	Thyristor(s)
				90	DC contactor

The implementation, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present utility model, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.

In addition, if there is a description of "first", "second", etc. in the embodiments of the present utility model, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

The utility model provides a high-power direct-current charging device.

In an embodiment of the present utility model, as shown in fig. 1, the high-power dc charging device includes an input module 10, a rectifier 20, an output module 30, and a control module 40;

the input end of the input module 10 is connected with three-phase alternating current, the output end of the input module 10 is connected with the input end of the rectifier 20, the output end of the rectifier 20 is connected with the input end of the output module 30, the output end of the output module 30 is used for outputting direct current, and the control module 40 is in communication connection with the rectifier 20 through a PWM interface.

In this embodiment, the input end is used for connecting the three-phase ac power output to the rectifier 20, so as to ensure the stable operation of the rectifier 20, and avoid the problem that the connected three-phase ac power damages the rectifier 20 due to factors such as peak current generated by external interference, or the working efficiency of the rectifier 20 is low due to clutter caused by external interference.

The three-phase alternating current which is connected into the electric vehicle is converted into direct current through the rectifier 20, so that the problem of low charging efficiency existing in the prior art that the electric vehicle is charged by adopting the DC/DC module is solved, meanwhile, the electric vehicle is charged by the output direct current, and the problem of low power existing in the prior another charging mode, namely the alternating current charging mode of the AC/AC module, is solved.

The control module 40 establishes communication connection with the rectifier 20 through the PWM interface, receives related charging information uploaded by a user through the control module 40, and correspondingly controls the control module 40 based on charging requirements of the charging information uploaded by the user, for example, when a charging plug on a charging system is connected to an electric automobile by the user, the control module 40 defaults to have charging requirements, the control module 40 controls the rectifier 20 to be conducted, and starts to operate an operation flow of converting three-phase alternating current into direct current to charge the electric automobile, when the user pulls out the charging plug on the charging system from the electric automobile, the control module 40 defaults to have no charging requirements, and the control module 40 controls the rectifier 20 to be turned off, so that the problem of resource waste caused by conversion and output of direct current still existing in the rectifier 20 when the electric automobile is not required to be charged is avoided.

Further, the input module 10 includes a surge protection unit 50, and the surge protection unit 50 is connected to the three-phase alternating current;

the surge protection unit 50 includes a first TVS pipe TVS1, a second TVS pipe TVS2, and a third TVS pipe TVS3;

the positive electrode of the first TVS tube TVS1 is connected with a first phase alternating current power supply of the three-phase alternating current, the positive electrode of the second TVS tube TVS2 is connected with a second phase alternating current power supply of the three-phase alternating current, and the positive electrode of the third TVS tube TVS3 is connected with a third phase alternating current power supply of the three-phase alternating current.

The first TVS tube TVS1, the second TVS tube TVS2 and the third TVS tube TVS3 are respectively connected to the three-phase input end of the three-phase alternating current, so that damage to other modules, units and the like in the high-power direct current charging device caused by peak current generated by the interference of the three-phase alternating current from the outside can be avoided, and the safe operation of the high-power direct current charging device is guaranteed.

Further, the input module 10 further comprises a circuit breaker 60;

the first input end of the circuit breaker 60 is connected with the negative electrode of the first TVS tube TVS1, the second input end of the circuit breaker 60 is connected with the negative electrode of the second TVS tube TVS2, and the third input end of the circuit breaker 60 is connected with the negative electrode of the third TVS tube TVS 3.

The circuit breaker 60 provided at the rear end of the surge protection unit 50 can control the switching on and off of the input of the three-phase alternating current, i.e., can rapidly cut off the input of the three-phase alternating current when the rectifier 20 has a fault, thereby ensuring the safety of the rectifier 20.

Specifically, referring to fig. 2, the input module 10 further includes a power filter 70, and the power filter 70 is connected between the circuit breaker 60 and the rectifier 20;

the power filter 70 includes a first varistor R1, a second varistor R2, a first inductor L1, a second inductor L2, a third inductor L3, a fourth inductor L4, a common-mode inductor L5, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, and a sixth capacitor C6;

the second end of the first inductor L1 is connected with the first end of the second inductor L2, the first end of the first inductor L1 is connected with the first output end of the circuit breaker 60, and the second end of the second inductor L2 is connected with the first end of the common-mode inductor L5;

the second end of the third inductor L3 is connected to the first end of the fourth inductor L4, the first end of the third inductor L3 is connected to the third output end of the circuit breaker 60, and the second end of the fourth inductor L4 is connected to the second end of the common-mode inductor L5;

the first varistor R1 and the second varistor R2 are connected in series between the first end of the first inductor L1 and the first end of the third inductor L3, the first capacitor C1 and the second capacitor C2 are connected in series between the first end of the first inductor L1 and the first end of the third inductor L3, the third capacitor C3 and the fourth capacitor C4 are connected in series between the second end of the first inductor L1 and the second end of the third inductor L3, and the second output end of the circuit breaker 60 is connected to the connection point of the third capacitor C3 and the fourth capacitor C4 via the connection point of the first varistor R1 and the second varistor R2;

the fifth capacitor C5 is connected between the second end of the second inductor L2 and the second end of the fourth inductor L4, and the sixth capacitor C6 is connected between the third end of the common-mode inductor L5 and the fourth end of the common-mode inductor L5;

the third terminal of the common-mode inductance L5 and the fourth terminal of the common-mode inductance L5 are connected to the input terminal of the rectifier 20.

In the present embodiment, the power filter 70 filters the interference signal in the three-phase ac power input to the rectifier 20, so as to avoid the situation of low conversion efficiency of the dc power converted by the rectifier 20 caused by the interference signal, and improve the dc power output capability of the high-power dc charging device.

Specifically, the first piezoresistor R1 and the second piezoresistor R2 are used for protecting transient voltage in the circuit of the power filter 70, the first inductor L1, the second inductor L2, the third inductor L3, the fourth inductor L4, the first capacitor C1, the second capacitor C2, the third capacitor C3 and the fourth capacitor C4 form a high-frequency filter for absorbing high frequency in the three-phase alternating current to cause interference, the common-mode inductor L5 is used for absorbing harmonic interference in the three-phase alternating current to output the alternating current to the rectifier 20, and the fifth capacitor C5 and the sixth capacitor C6 on two sides of the common-mode inductor L5 are used for eliminating common-mode interference.

Specifically, referring to fig. 3, the rectifier 20 includes: a first thyristor D1, a second thyristor D2, a third thyristor D3, a fourth thyristor D4 and a load;

a third end of the common-mode inductor L5 is connected to a connection point between the positive electrode of the first thyristor D1 and the negative electrode of the second thyristor D2, and a fourth end of the common-mode inductor L5 is connected to a connection point between the positive electrode of the third thyristor D3 and the negative electrode of the fourth thyristor D4;

the negative electrode of the first thyristor D1 and the negative electrode of the third thyristor D3 are connected to the first end of the load together, the positive electrode of the second thyristor D2 and the positive electrode of the fourth thyristor D4 are connected to the second end of the load together, and the output end of the load is connected to the input end of the output module 30;

the load comprises a resistive load, an inductive load, or a back emf load.

The received alternating current is rectified into direct current by controlling the triggering delay angles of the first thyristor D1, the second thyristor D2, the third thyristor D3 and the fourth thyristor D4, meanwhile, as the first thyristor D1, the second thyristor D2, the third thyristor D3 and the fourth thyristor D4 belong to a semi-controlled device, the input time of an input PWM signal is changed through a PWM interface of the control module 40, the magnitude of the triggering delay angle can be changed, so that direct current with different values is obtained, and the effect of controlling the magnitude of the output direct current is realized.

The type of load is set according to the situation of the rectifier 20 in practical use, i.e. the resistive load, the inductive load or the back emf load is selected based on the practical use situation.

Further, the output module 30 includes a dc filter 80;

the input of the dc filter 80 is connected to the output of the rectifier 20.

Further, the output module 30 further includes a dc contactor 90;

the input end of the dc contactor 90 is connected to the output end of the dc filter 80, the control end of the dc contactor 90 is in communication with the control module 40, and the output end of the dc contactor 90 is used for outputting dc.

In this embodiment, the dc filter 80 connected to the output end of the rectifier 20 is mainly used for blocking and shorting the ac signal in the dc power, so that the output dc power waveform is smoother, and the safety and stability of the high-power dc charging device are ensured.

In addition, the control end of the dc contactor 90 is in communication with the control module 40, so as to realize the output state of the dc contactor 90 for controlling the dc power to be output to the electric vehicle, for example, when the dc contactor 90 receives the control command for stopping charging sent by the control module 40, the dc power output to the electric vehicle can be directly stopped.

Further, the control module 40 includes a controller 100;

the controller 100 adopts a controller 100 with the model number of STM 32;

the PWM interface of the controller 100 is in communication connection with the rectifier 20, the controller 100 controls the dc conversion efficiency of the rectifier 20, so as to control the charging efficiency of the electric vehicle, the controller 100 is in communication connection with the control end of the dc contactor 90, and the controller 100 controls the dc contactor 90 to output the dc to the output state of the electric vehicle.

Further, the control module 40 further includes a sampling unit 110;

the input end of the sampling unit 110 is connected to the output end of the dc contactor 90, and the output end of the sampling unit 110 is connected to the controller 100.

In this embodiment, the sampling unit 110 is configured to collect the voltage and the current of the direct current output by the direct current contactor 90 to the electric vehicle, send the collected voltage and current to the controller 100, and the controller 100 determines the charging state information according to the received voltage and the output current, and sends the charging state information to the display device of the charging system for displaying.

The present embodiment also proposes a charging system including the high-power direct-current charging device as described above, the high-power direct-current charging device including an input module 10, a rectifier 20, an output module 30, and a control module 40;

the input end of the input module 10 is connected with three-phase alternating current, the output end of the input module 10 is connected with the input end of the rectifier 20, the output end of the rectifier 20 is connected with the input end of the output module 30, the output end of the output module 30 is used for outputting direct current, and the control module 40 is in communication connection with the rectifier 20 through a PWM interface.

The foregoing description is only of the optional embodiments of the present utility model, and is not intended to limit the scope of the utility model, and all the equivalent structural changes made by the description of the present utility model and the accompanying drawings or the direct/indirect application in other related technical fields are included in the scope of the utility model.

Claims (9)

1. The high-power direct-current charging device is characterized by comprising an input module, a rectifier, an output module and a control module;

the input end of the input module is connected with three-phase alternating current, the output end of the input module is connected with the input end of the rectifier, the output end of the rectifier is connected with the input end of the output module, the output end of the output module is used for outputting direct current, and the control module is in communication connection with the rectifier through a PWM interface;

the input module comprises a power filter, and the power filter comprises a common mode inductance;

the rectifier includes: a first thyristor, a second thyristor, a third thyristor, a fourth thyristor, and a load;

the third end of the common-mode inductor is connected to a connection point of the positive electrode of the first thyristor and the negative electrode of the second thyristor, and the fourth end of the common-mode inductor is connected to a connection point of the positive electrode of the third thyristor and the negative electrode of the fourth thyristor;

the negative electrode of the first thyristor and the negative electrode of the third thyristor are connected to the first end of the load together, the positive electrode of the second thyristor and the positive electrode of the fourth thyristor are connected to the second end of the load together, and the output end of the load is connected with the input end of the output module;

the load comprises a resistive load, an inductive load, or a back emf load.

2. The high-power direct current charging device according to claim 1, wherein the input module comprises a surge protection unit, and the surge protection unit is connected to the three-phase alternating current;

the surge protection unit comprises a first TVS tube, a second TVS tube and a third TVS tube;

the positive electrode of the first TVS tube is connected with a first phase alternating current power supply of the three-phase alternating current, the positive electrode of the second TVS tube is connected with a second phase alternating current power supply of the three-phase alternating current, and the positive electrode of the third TVS tube is connected with a third phase alternating current power supply of the three-phase alternating current.

3. The high power dc charging device of claim 2, wherein the input module further comprises a circuit breaker;

the first input end of the circuit breaker is connected with the negative electrode of the first TVS tube, the second input end of the circuit breaker is connected with the negative electrode of the second TVS tube, and the third input end of the circuit breaker is connected with the negative electrode of the third TVS tube.

4. A high power dc charging apparatus according to claim 3, wherein said power filter is connected between said circuit breaker and said rectifier;

the power supply filter further comprises a first piezoresistor, a second piezoresistor, a first inductor, a second inductor, a third inductor, a fourth inductor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor and a sixth capacitor;

the second end of the first inductor is connected with the first end of the second inductor, the first end of the first inductor is connected with the first output end of the circuit breaker, and the second end of the second inductor is connected with the first end of the common mode inductor;

the second end of the third inductor is connected with the first end of the fourth inductor, the first end of the third inductor is connected with the third output end of the circuit breaker, and the second end of the fourth inductor is connected with the second end of the common mode inductor;

the first piezoresistor and the second piezoresistor are connected between the first end of the first inductor and the first end of the third inductor in series, the first capacitor and the second capacitor are connected between the first end of the first inductor and the first end of the third inductor in series, the third capacitor and the fourth capacitor are connected between the second end of the first inductor and the second end of the third inductor in series, and the second output end of the circuit breaker is connected to the connection point of the third capacitor and the fourth capacitor through the connection point of the first piezoresistor and the second piezoresistor and the connection point of the first capacitor and the second capacitor;

the fifth capacitor is connected between the second end of the second inductor and the second end of the fourth inductor, and the sixth capacitor is connected between the third end of the common-mode inductor and the fourth end of the common-mode inductor;

and the third end of the common-mode inductor and the fourth end of the common-mode inductor are connected to the input end of the rectifier.

5. The high power dc charging apparatus of claim 4, wherein the output module comprises a dc filter;

the input end of the direct current filter is connected with the output end of the rectifier.

6. The high power dc charging apparatus of claim 5, wherein the output module further comprises a dc contactor;

the input end of the direct current contactor is connected with the output end of the direct current filter, the control end of the direct current contactor is in communication connection with the control module, and the output end of the direct current contactor is used for outputting direct current.

7. The high power dc charging apparatus of claim 6, wherein the control module comprises a controller;

the controller adopts a controller with the model STM 32;

and the PWM interface of the controller is in communication connection with the rectifier, and the controller is in communication connection with the control end of the direct current contactor.

8. The high power dc charging apparatus of claim 7, wherein the control module further comprises a sampling unit;

the input end of the sampling unit is connected to the output end of the direct current contactor, and the output end of the sampling unit is connected to the controller.

9. A charging system comprising a high power dc charging device according to any one of claims 1 to 8.

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