Charging pile circuit, charging pile and charging pile system

Abstract

The present application discloses a charging pile circuit, a charging pile and a charging pile, comprising: a PWM wave controller for outputting PWM; a power tube, a gate connected to the output end of the PWM wave controller, and the on and off of the power tube is controlled by the PWM wave controller; a first diode, a second diode, a third diode, and a fourth diode, wherein the anode of the first diode is connected to the cathode of the second diode, the anode of the third diode is connected to the cathode of the fourth diode, the cathode of the first diode and the cathode of the third diode are connected to the drain electrode of the power tube, and the anode of the second diode and the anode of the fourth diode are connected to the source electrode of the power tube; wherein the first end of the AC input is connected to the cathode of the second diode, and the anode of the third diode is connected to the second end of the AC input through an LC filter circuit.

Description

Technical Field

[0001] The present application relates to charging pile technology, and in particular to a charging pile circuit, a charging pile and a charging pile system. Background Art

[0002] With the increasing popularity of new energy vehicles, charging piles, as essential equipment for new energy vehicles, are becoming more and more popular. As charging piles become more and more popular, the power load of charging piles is mainly determined by the on-board charger, and the mileage design of new energy vehicles is getting longer and longer, and the charging power is also getting higher and higher. In addition, large-scale charging demand is concentrated at a specific time and place, which may cause excessive short-term load on the power grid, causing power grid stability problems and energy supply pressure. In order to solve this problem, it is necessary to design a solution to reasonably allocate electric vehicle charging demand, optimize the utilization rate of charging facilities, and balance the power grid load. In response to this challenge, we can explore the use of intelligent charging pile management systems to achieve power grid load balancing and sustainable development.

[0003] Traditional load control is generally achieved by shedding loads, but this method cannot fully meet the power supply needs of charging users. In related technologies, static synchronous compensators (STATCOM) can be used to improve the circuit, but the price is relatively high. The relatively cheap static VAR compensator (SVC) technology lacks dynamic compensation capabilities and the response speed also has room for improvement. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a charging pile circuit, a charging pile and a charging pile system.

[0005] On the one hand, an embodiment of the present application provides a charging pile circuit, including:

[0006] PWM wave controller, used to output PWM;

[0007] A power tube, the gate of which is connected to the output end of the PWM wave controller, and the on and off of the power tube is controlled by the PWM wave controller;

[0008] A first diode, a second diode, a third diode, and a fourth diode, wherein the anode of the first diode is connected to the cathode of the second diode, the anode of the third diode is connected to the cathode of the fourth diode, the cathode of the first diode and the cathode of the third diode are connected to the drain electrode of the power tube, and the anode of the second diode and the anode of the fourth diode are connected to the source electrode of the power tube;

[0009] The first end of the AC input is connected to the cathode of the second diode, and the anode of the third diode is connected to the second end of the AC input via an LC filter circuit.

[0010] In some embodiments, the LC circuit includes a first LC cell and a second LC cell having the same structure.

[0011] In some embodiments, the first LC unit includes a first inductor and a first capacitor;

[0012] The second LC unit includes a second inductor and a second capacitor;

[0013] The first end of the first inductor is connected to the anode of the third diode, and the second end of the first inductor is connected to the second end of the AC input through the first capacitor;

[0014] The first end of the second inductor is connected to the second end of the first inductor, and the second end of the second inductor is connected to the second end of the AC input through a second capacitor.

[0015] On the other hand, an embodiment of the present application provides a charging pile, including: the charging pile circuit described above.

[0016] In some embodiments, the charging pile further includes a data acquisition unit, and the data acquisition power supply is used to collect voltage and / or current data.

[0017] In some embodiments, the charging pile further includes a circuit breaker, which is used to control a power supply circuit on an input side or an output side of the charging pile circuit.

[0018] In some embodiments, a communication module is also included, and the communication module is used to communicate with the server.

[0019] In some embodiments, a plurality of charging pile circuits are included.

[0020] On the other hand, an embodiment of the present application provides a charging pile system, including:

[0021] A plurality of charging piles as described above;

[0022] The data analysis platform obtains the data of the data acquisition unit of the charging pile through the communication module of the charging pile;

[0023] A remote status monitoring platform is used to control the opening and closing of the circuit breaker.

[0024] The purpose of the utility model is to achieve voltage adjustment by using AC chopping technology. The device can achieve high-precision constant current output by high-frequency chopping control of the input AC constant voltage source. The actual system has a compact structure and stable and reliable operation. The AC chopping type reactive power compensation technology is a new type of dynamic reactive power compensation technology. Compared with the static synchronous compensator (STATCOM), it has similar performance but lower cost. Compared with the static VAR compensator (SVC), the cost is comparable, but it has dynamic compensation capability and faster response speed. As an important part of it, the LC filter can make the compensator output a sinusoidal compensation current and reduce the compensation current harmonics to the allowable standard.

[0025] In some embodiments, in order to make the AC chopper type reactive power compensator output a sinusoidal reactive power compensation current, a second-order LC filter is used to filter out high-order harmonics in view of the high harmonic order of the AC chopper. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following is a brief introduction to the drawings required for describing the embodiments.

[0027] Figure 1 It is a circuit schematic diagram provided in an embodiment of the present application.

[0028] Figure 2 It is a schematic diagram of a charging pile system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described through the implementation method with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0030] Reference Figure 1 The embodiment of the present application provides a charging pile circuit, which is applied to a charging pile and includes:

[0031] PWM wave controller is used to output PWM. Usually, PWM wave controller can be implemented by a dedicated power chip or a single-chip microcomputer. Usually, the output voltage is controlled by the duty cycle of the PWM wave.

[0032] The power tube is usually a power MOS tube, the gate of which is connected to the output end of the PWM wave controller, and the on and off of the power tube is controlled by the PWM wave controller. The AC input can be chopped by controlling the power tube to switch quickly through the high-frequency PWM wave.

[0033] The first diode, the second diode, the third diode, and the fourth diode, wherein the anode of the first diode is connected to the cathode of the second diode, the anode of the third diode is connected to the cathode of the fourth diode, the cathode of the first diode and the cathode of the third diode are connected to the drain electrode of the power tube, and the anode of the second diode and the anode of the fourth diode are connected to the source electrode of the power tube; usually, the above four diodes are power diodes, also called power diodes.

[0034] Among them, the first end of the AC input is connected to the cathode of the second diode, and the anode of the third diode is connected to the second end of the AC input through an LC filter circuit. The LC circuit includes a first LC unit and a second LC unit with the same structure. The first LC unit includes a first inductor and a first capacitor; the second LC unit includes a second inductor and a second capacitor; the first end of the first inductor is connected to the anode of the third diode, and the second end of the first inductor is connected to the second end of the AC input through the first capacitor; the first end of the second inductor is connected to the second end of the first inductor, and the second end of the second inductor is connected to the second end of the AC input through the second capacitor. In order to make the AC chopper type reactive compensator output a sinusoidal reactive compensation current, a second-order LC filter is used to filter out high-order harmonics in view of the high harmonic order of the AC chopper. At the same time, the system can directly obtain the desired target voltage by changing the duty cycle of the MOS tube.

[0035] like Figure 1 As shown, by setting the turn-on voltage of the MOS tube, the gate and source of the MOS tube can reach the turn-on voltage when the PWM wave is at a high potential, so that the drain and source will be turned on, which can be equivalent to a short circuit. When the PWM wave is at a low potential, the drain and source will be turned off, which can be equivalent to an open circuit, thereby obtaining a chopped waveform.

[0036] By changing the duty cycle of the PWM signal, the ratio of the switch-on time to the total cycle can be changed. The higher the duty cycle, the longer the switch-on time, and the higher the output voltage. Conversely, the lower the duty cycle, the lower the output voltage. Therefore, by adjusting the duty cycle of the PWM signal, the output voltage can be continuously adjustable. Therefore, by changing the duty cycle of the PWM wave in the step-down chopper circuit, the output voltage can be effectively controlled to obtain the desired voltage range.

[0037] LC filters are usually composed of inductors and capacitors, which together form a filter network. The role of the inductor is to filter out high-frequency noise, while the role of the capacitor is to filter out low-frequency noise. According to specific application requirements, selecting appropriate inductor and capacitor values ​​can effectively improve the quality of the output voltage and improve the stability and reliability of the circuit.

[0038] Reference Figure 2 , an embodiment of the present application discloses a charging pile system, which includes multiple charging piles, a data analysis platform and a remote status monitoring platform.

[0039] Among them, the charging piles include Figure 1 The circuit described above, the charging pile also includes a data acquisition unit, and the data acquisition power supply is used to collect voltage and / or current data. The charging pile also includes a circuit breaker, and the circuit breaker is used to control the power supply circuit on the input side or output side of the charging pile circuit. The charging pile also includes a communication module, and the communication module is used to communicate with the server side.

[0040] The data analysis platform obtains the data of the data acquisition unit of the charging pile through the communication module of the charging pile;

[0041] A remote status monitoring platform is used to control the opening and closing of the circuit breaker.

[0042] The circuit of the present application includes a power electronic switch structure, which mainly includes a MOS tube and four power diodes. The PWM control technology is used to drive the power MOSFET. The duty cycle of the drive signal is set to D. By changing the duty cycle D, the corresponding voltage control can be achieved. After the above-mentioned AC chopping, the output voltage is smoothed by using an LC filter to reduce the ripple component of the output voltage.

[0043] like Figure 2 The smart circuit breaker shown can be remotely started and stopped intelligently according to the load conditions of the power grid. From the control strategy point of view, if the total load of the charging pile does not reach the over-limit value, there is no need to start the load controller. In this mode, the remote monitoring platform issues instructions to the smart circuit breaker, so that the smart circuit breaker bypasses the load controller to avoid the power electronic module from being subjected to voltage stress for too long. If the total load of the charging pile reaches the over-limit value, the load controller needs to be started, and the current load is calculated by the data analysis platform to accurately adjust the duty cycle until the load returns to normal levels.

[0044] In order to further improve the safety and reliability of the distribution network, three sets of new load controllers are deployed, combined with power Internet of Things technology and intelligent circuit breakers to achieve dynamic monitoring of the load status, line current, transformer load rate, and power quality of the entire area. The intelligent remote control system is composed of multiple modules. The system can effectively adjust the charging power of the charging pile in real time according to the current load of the power grid. The addition of this system can quickly and efficiently adjust the power, and also effectively reduce the overall energy consumption and loss of the charging pile.

[0045] At the same time, big data analysis methods are also used to predict load peak periods, set load adjustment targets in advance, and achieve "flexible" control of load in the substation. Based on historical load data, the actual load access rules of the substation are analyzed in real time, and control instructions are dynamically updated and issued to guide the load controller to accurately switch working modes, thereby improving the adaptability of the equipment and system.

[0046] Using PWM control, the voltage and current acquisition circuit, the voltage and current data analysis module, and the remote status monitoring platform can be used together to complete the task. First, when the grid load is high, a command is issued to the remote status monitoring platform to shut down the intelligent circuit breaker. At this time, the load controller is turned on, and the current voltage is adjusted by changing the duty cycle. The voltage and current values ​​are then collected in real time by the voltage acquisition circuit and the current acquisition circuit. When the load control requirements are met, the duty cycle of the MOS tube is no longer adjusted, so that it maintains the current duty cycle and runs stably until the grid load is low. Then, a command is issued to the remote status monitoring platform to bypass the load controller. At this time, the load controller is short-circuited and no longer works.

[0047] Note that the above are only preferred embodiments of the present application and the technical principles used. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present application. Therefore, although the present application is described in more detail through the above embodiments, the present application is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the appended claims.

Claims

1. A charging pile circuit, characterized in that: include: PWM wave controller, used for outputting PWM; A power tube, the gate of which is connected to the output end of the PWM wave controller, and the on and off of the power tube is controlled by the PWM wave controller; A first diode, a second diode, a third diode, and a fourth diode, wherein the anode of the first diode is connected to the cathode of the second diode, the anode of the third diode is connected to the cathode of the fourth diode, the cathode of the first diode and the cathode of the third diode are connected to the drain electrode of the power tube, and the anode of the second diode and the anode of the fourth diode are connected to the source electrode of the power tube; The first end of the AC input is connected to the cathode of the second diode, and the anode of the third diode is connected to the second end of the AC input via an LC filter circuit.

2. The charging pile circuit according to claim 1, characterized in that: The LC filter circuit includes a first LC unit and a second LC unit with the same structure.

3. The charging pile circuit according to claim 2, characterized in that: The first LC unit includes a first inductor and a first capacitor; The second LC unit includes a second inductor and a second capacitor; The first end of the first inductor is connected to the anode of the third diode, and the second end of the first inductor is connected to the second end of the AC input through the first capacitor; The first end of the second inductor is connected to the second end of the first inductor, and the second end of the second inductor is connected to the second end of the AC input through a second capacitor.

4. A charging pile, characterized in that: include: A charging pile circuit as described in any one of claims 1 to 3.

5. A charging pile according to claim 4, characterized in that: Includes multiple charging pile circuits.

6. A charging pile according to claim 5, characterized in that: The charging pile also includes a data acquisition unit, and the data acquisition power supply is used to collect voltage and / or current data.

7. A charging pile according to claim 6, characterized in that: The charging pile further includes a circuit breaker, which is used to control a power supply circuit on an input side or an output side of the charging pile circuit.

8. A charging pile according to claim 7, characterized in that: It also includes a communication module, which is used for communication connection with the server end.

9. A charging pile system, characterized in that: include: A plurality of charging piles as claimed in any one of claims 4 to 7; The data analysis platform obtains the data of the data acquisition unit of the charging pile through the communication module of the charging pile; A remote status monitoring platform is used to control the opening and closing of the circuit breaker.

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