Portable direct current charger of electric automobile

Abstract

The utility model provides a portable direct current charger of an electric automobile, and relates to the field of new energy automobiles, the portable direct current charger of the electric automobile comprises a shell, an input line and an output line are arranged on the shell, and a charging system is integrated in the shell. The device is small in overall size, light in weight, small in occupied area, convenient to carry along with a vehicle and suitable for various application scenes; the circuit part comprises an input EMI filter circuit, a PFC module, a control module and a DC-DC module part, and the cost is effectively controlled while the working performance is met.

Description

Technical Field

[0001] The present application relates to the field of new energy vehicles, and more specifically, to a portable DC charger for electric vehicles. Background Art

[0002] Currently, most electric vehicles are limited to charging through charging piles. Since charging pile stations are not popular, there are many inconveniences for charging in rural areas or for home use. In addition, existing charging piles are fixed and cannot be moved, making them inconvenient to use. Summary of the invention

[0003] The purpose of the embodiments of the present application is to provide a portable DC charger for an electric vehicle, which can solve the technical problem that the charging pile cannot be moved.

[0004] An embodiment of the present application provides a portable DC charger for an electric vehicle, comprising a shell, on which an input line and an output line are provided, a charging system is integrated inside the shell, the charging system comprises an EMI filter circuit, a PFC module, a control module, and a DC-DC module, one end of the input line is connected to the mains, the other end of the input line is connected to one end of the EMI filter circuit, the other end of the EMI filter circuit is connected to the input end of the PFC module, the output end of the PFC module is respectively connected to the control module and one end of the DC-DC module, and the other end of the DC-DC module is connected to the output line.

[0005] Preferably, the PFC module includes a processor U1, an inductor L1, a capacitor C3, a MOS tube Q1, a capacitor C4, a capacitor C5, a capacitor C6, a capacitor C7, a resistor R6, a resistor R7, a capacitor C8, a diode D2, a diode D3, and a diode D4. The fifth interface of the processor U1 is grounded through the capacitor C5, one end of the capacitor C6 is grounded to one end of the resistor R5, and the other end of the resistor R5 is connected to the fifth interface of the processor U1. The seventh interface of the processor U1 is grounded through the capacitor C4, the eighth interface of the processor U1 is connected to the G pole of the MOS tube Q1, and the S pole of the MOS tube Q1 is connected to the output end of the EMI filter circuit through the inductor L1. , the input end of the diode D4 is connected to the S pole of the MOS tube Q1, the diode D2 is connected in parallel with the diode D3, the output end of the diode D2 is connected to the output end of the EMI filter circuit, the output end of the diode D2 is connected to the output end of the diode D4, the S pole of the MOS tube Q1 is connected to the D pole of the MOS tube Q1 through the capacitor C7, the D pole of the MOS tube Q1 is grounded, one end of the resistor R6 is connected to the output end of the diode D4, the other end of the resistor R6 is connected to one end of the resistor R7, the other end of the resistor R7 is grounded, one end of the capacitor C8 is connected to the output end of the diode D4, and the other end of the capacitor C8 is grounded.

[0006] Preferably, the EMI filtering circuit includes a full-wave rectifier bridge D1, a capacitor C1, a capacitor C3, a resistor R1, a resistor R2, a resistor R3, and a resistor R4. The input end of the full-wave rectifier bridge D1 is connected to the input line, the output end of the full-wave rectifier bridge D1 is connected to one end of the capacitor C1, the other end of the capacitor C1 is grounded through the resistor R1, one end of the capacitor C2 is connected to the second interface of the processor U1, the other end of the capacitor C2 is grounded, one end of the resistor R2 is connected to the third interface of the processor U1, the other end of the resistor R2 is grounded, one end of the resistor R3 is connected to the output end of the full-wave rectifier bridge D1, the other end of the resistor R3 is connected to the fourth interface of the processor U1 and one end of the resistor R4, and the other end of the resistor R4 is grounded.

[0007] Preferably, the model of the processor U1 is UCC28019.

[0008] Preferably, the control module comprises an LLC resonant circuit, and the LLC resonant circuit consists of four MOS tubes.

[0009] Preferably, a cooling fan is provided on the housing, and at least two cooling fans are provided.

[0010] Preferably, a metal dust screen is provided at the heat dissipation fan.

[0011] Beneficial effects of the utility model:

[0012] The utility model provides a portable DC charger for an electric vehicle, comprising a shell, wherein an input line and an output line are arranged on the shell, a charging system is integrated inside the shell, the charging system comprises an EMI filter circuit, a PFC module, a control module, and a DC-DC module, one end of the input line is connected to the mains, the other end of the input line is connected to one end of the EMI filter circuit, the other end of the EMI filter circuit is connected to the input end of the PFC module, the output end of the PFC module is respectively connected to one end of the control module and the DC-DC module, and the other end of the DC-DC module is connected to the output line. The whole machine of the utility model is composed of a shell, an input line, an output line, and a charging system, and has a small overall size, light weight, and a small footprint, is convenient to carry in a vehicle, and is suitable for a variety of application scenarios; the circuit part comprises an input EMI filter circuit, a PFC module, a control module, and a DC-DC module part, which effectively controls the cost while meeting the working performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1 It is a schematic diagram of the structure of the utility model;

[0015] Figure 2 This is the connection diagram of the EMI filter circuit and PFC module circuit of the utility model;

[0016] Figure 3 This is a circuit connection diagram of the control module and DC-DC module of the utility model.

[0017] The reference numerals are:

[0018] 1. Outer shell; 2. Cooling fan; 3. Dust screen. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0021] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0022] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the application is usually placed when in use. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0023] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0024] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0025] like Figure 1-3As shown, a portable DC charger for an electric vehicle comprises a shell 1, on which an input line and an output line are arranged, a charging system is integrated inside the shell 1, and the charging system comprises an EMI filter circuit, a PFC module, a control module, and a DC-DC module. One end of the input line is connected to the mains, the other end of the input line is connected to one end of the EMI filter circuit, the other end of the EMI filter circuit is connected to the input end of the PFC module, the output end of the PFC module is respectively connected to one end of the control module and the DC-DC module, and the other end of the DC-DC module is connected to the output line. The whole machine of the utility model is composed of a shell 1, an input line, an output line, and a charging system. The overall volume is small, the weight is light, and the floor space is small. It is convenient to carry with the vehicle and is suitable for a variety of application scenarios. The circuit part comprises an input EMI filter circuit, a PFC module, a control module, and a DC-DC module part, which effectively controls the cost while meeting the working performance.

[0026] like Figure 2 As shown, in this embodiment, the PFC module includes a processor U1, an inductor L1, a capacitor C3, a MOS tube Q1, a capacitor C4, a capacitor C5, a capacitor C6, a capacitor C7, a resistor R6, a resistor R7, a capacitor C8, a diode D2, a diode D3, and a diode D4. The fifth interface of the processor U1 is grounded through the capacitor C5, one end of the capacitor C6 is grounded to one end of the resistor R5, and the other end of the resistor R5 is connected to the fifth interface of the processor U1. The seventh interface of the processor U1 is grounded through the capacitor C4, the eighth interface of the processor U1 is connected to the G pole of the MOS tube Q1, and the S pole of the MOS tube Q1 is connected to the output end of the EMI filter circuit through the inductor L1. The input end of the diode D4 is connected to the S pole of the MOS tube Q1, the diode D2 is connected in parallel with the diode D3, the output end of the diode D2 is connected to the output end of the EMI filter circuit, the output end of the diode D2 is connected to the output end of the diode D4, the S pole of the MOS tube Q1 is connected to the D pole of the MOS tube Q1 through the capacitor C7, the D pole of the MOS tube Q1 is grounded, one end of the resistor R6 is connected to the output end of the diode D4, the other end of the resistor R6 is connected to one end of the resistor R7, the other end of the resistor R7 is grounded, one end of the capacitor C8 is connected to the output end of the diode D4, and the other end of the capacitor C8 is grounded.

[0027] like Figure 2As shown, in this embodiment, the EMI filtering circuit includes a full-wave rectifier bridge D1, a capacitor C1, a capacitor C3, a resistor R1, a resistor R2, a resistor R3, and a resistor R4. The input end of the full-wave rectifier bridge D1 is connected to the input line, the output end of the full-wave rectifier bridge D1 is connected to one end of the capacitor C1, the other end of the capacitor C1 is grounded through the resistor R1, one end of the capacitor C2 is connected to the second interface of the processor U1, the other end of the capacitor C2 is grounded, one end of the resistor R2 is connected to the third interface of the processor U1, the other end of the resistor R2 is grounded, one end of the resistor R3 is connected to the output end of the full-wave rectifier bridge D1, the other end of the resistor R3 is connected to the fourth interface of the processor U1 and one end of the resistor R4, and the other end of the resistor R4 is grounded.

[0028] like Figure 2 As shown, specifically, the AC power is filtered by EMI and then full-wave rectified by the rectifier bridge D1; the diode D2 and the diode D3 are used to pre-charge the filter capacitor C8; the diode D4 is a rectifier diode; the inductor L1 is a BOOST boost inductor; the resistor R1 is a current detection sampling resistor, and the sampling signal is given to the control module through the resistor R2; the resistor R3 and the resistor R4 form a voltage divider to detect whether the input AC voltage value is over-voltage or under-voltage, and the processor U1 will perform input over-voltage and under-voltage protection; the resistor R6 and the resistor R7 divide the output voltage signal to the processor U1 for output voltage closed-loop regulation; the capacitor C5, the capacitor C6 and the resistor R5 form a soft start network regulation; the capacitor C1, the capacitor C3, and the capacitor C4 are all filter capacitors; the capacitor C2 is a current loop compensation capacitor, coupling the current signal to the processor U1; the capacitor C7 is to reduce the voltage stress of the MOS tube Q1, and the circuit operates in a wide range continuous conduction mode, with a fixed frequency of 65kHz, and uses the peak current mode for closed-loop regulation, and the maximum duty cycle can reach 97%.

[0029] like Figure 2 As shown, in this embodiment, the model of the processor U1 is UCC28019.

[0030] like Figure 3As shown, in this embodiment, the control module includes an LLC resonant circuit, and the LLC resonant circuit is composed of four MOS tubes. Specifically, Lr is a resonant inductor, Cr is a resonant capacitor, Lm is an excitation inductor, and the transformer Tr performs energy transfer. The output diodes Dr1 and Dr2 and the output capacitor Cout perform rectification and filtering. Before the MOS tube is turned on, the current flows through the body diode of the MOS tube, so that the voltage difference between the DS of the MOS tube is close to 0V. At this time, turning on the MOS tube can achieve zero voltage switching; when the MOS tube is turned off, since the voltage across the capacitor between the DS cannot change suddenly, the voltage difference between the DS of the MOS tube is also close to 0V, thereby achieving zero voltage switching of the MOS. Zero voltage switching reduces switching losses and thus improves efficiency. Common control strategies for full-bridge LLC include fixed frequency control and variable frequency control. Fixed frequency control is to adjust the duty cycle of the converter to achieve control of the converter, and variable frequency control is to fix the duty cycle and achieve output control by changing the control frequency. Fixed frequency control can easily achieve functions such as soft start, current limiting, and voltage regulation through pulse width modulation, but when the input voltage increases, the duty cycle will decrease, resulting in an increase in the primary side circulating current, which reduces the efficiency of the converter; variable frequency control can achieve higher conversion efficiency. Therefore, DSP digital control is used to combine the advantages of the two.

[0031] like Figure 1 As shown, in this embodiment, a cooling fan 2 is provided on the outer shell 1, and at least two cooling fans 2 are provided. A metal dustproof net 3 is provided at the cooling fan 2. The cooling fan 2 of the utility model can be used to dissipate heat from the outer shell 1 of the utility model.

[0032] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A portable DC charger for electric vehicles, characterized in that: The invention comprises a shell, on which an input line and an output line are arranged, a charging system is integrated inside the shell, and the charging system comprises an EMI filter circuit, a PFC module, a control module, and a DC-DC module, one end of the input line is connected to the mains, the other end of the input line is connected to one end of the EMI filter circuit, the other end of the EMI filter circuit is connected to the input end of the PFC module, the output end of the PFC module is respectively connected to one end of the control module and the DC-DC module, and the other end of the DC-DC module is connected to the output line.

2. The portable DC charger for electric vehicles according to claim 1, characterized in that: The PFC module includes a processor U1, an inductor L1, a capacitor C3, a MOS tube Q1, a capacitor C4, a capacitor C5, a capacitor C6, a capacitor C7, a resistor R6, a resistor R7, a capacitor C8, a diode D2, a diode D3, and a diode D4. The fifth interface of the processor U1 is grounded through the capacitor C5, one end of the capacitor C6 is grounded to one end of the resistor R5, and the other end of the resistor R5 is connected to the fifth interface of the processor U1. The seventh interface of the processor U1 is grounded through the capacitor C4. The eighth interface of the processor U1 is connected to the G pole of the MOS tube Q1. The S pole of the MOS tube Q1 is connected to the output end of the EMI filter circuit through the inductor L1. The input end of the diode D4 is connected to the S pole of the MOS tube Q1, the diode D2 is connected to the diode D3 in parallel, the output end of the diode D2 is connected to the output end of the EMI filter circuit, the output end of the diode D2 is connected to the output end of the diode D4, the S pole of the MOS tube Q1 is connected to the D pole of the MOS tube Q1 through the capacitor C7, the D pole of the MOS tube Q1 is grounded, one end of the resistor R6 is connected to the output end of the diode D4, the other end of the resistor R6 is connected to one end of the resistor R7, the other end of the resistor R7 is grounded, one end of the capacitor C8 is connected to the output end of the diode D4, and the other end of the capacitor C8 is grounded.

3. The portable DC charger for electric vehicles according to claim 2, characterized in that: The EMI filtering circuit includes a full-wave rectifier bridge D1, a capacitor C1, a capacitor C3, a resistor R1, a resistor R2, a resistor R3, and a resistor R4. The input end of the full-wave rectifier bridge D1 is connected to the input line, the output end of the full-wave rectifier bridge D1 is connected to one end of the capacitor C1, the other end of the capacitor C1 is grounded through the resistor R1, one end of the capacitor C2 is connected to the second interface of the processor U1, the other end of the capacitor C2 is grounded, one end of the resistor R2 is connected to the third interface of the processor U1, the other end of the resistor R2 is grounded, one end of the resistor R3 is connected to the output end of the full-wave rectifier bridge D1, the other end of the resistor R3 is connected to the fourth interface of the processor U1 and one end of the resistor R4, and the other end of the resistor R4 is grounded.

4. The portable DC charger for electric vehicles according to claim 2, characterized in that: The model of the processor U1 is UCC28019.

5. The portable DC charger for electric vehicles according to claim 1, characterized in that: The control module comprises an LLC resonant circuit, and the LLC resonant circuit is composed of four MOS tubes.

6. The portable DC charger for electric vehicles according to claim 1, characterized in that: The housing is provided with a heat dissipation fan, and at least two heat dissipation fans are provided.

7. The portable DC charger for electric vehicles according to claim 6, characterized in that: A metal dustproof net is arranged at the heat dissipation fan.

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