Electric car and bi-directional inversion type motor controller

[0048] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

[0049] Please refer to figure 1 , Is a structural diagram of the first embodiment of the electric vehicle provided by the present invention. The electric vehicle includes: a motor controller 1, a power battery pack 2, an extended-range battery pack 3, and a motor 4.

[0050] Wherein, the motor controller 1 may be a two-way inverter motor controller. The so-called two-way inverter type means that the motor controller 1 can realize the interaction between DC (Direct Current, direct current) and AC (Alternating Current, alternating current). Conversion.

[0051] Specifically, the motor controller 1 may include: a bidirectional DC/DC module I101, a bidirectional DC/DC module II102, and a bidirectional DC/AC module 103. The bidirectional DC/DC module I101, the bidirectional DC/DC module II102, and the bidirectional DC/AC module 103 are connected to each other through a bus 104 (as shown in the figure). In addition, the bidirectional DC/DC module I101 is connected to the power battery pack 2, and is used to charge or discharge the power battery pack. The bidirectional DC/DC module II102 is connected to the extended-range battery pack 3, and is used to charge or discharge the extended-range battery pack 3. The bidirectional DC/AC module 103 is connected to the motor 13 for driving the motor 4 and connected to the power grid or a load for obtaining electric energy from the power grid or discharging the load.

[0052] In the embodiment of the present invention, the extended-range battery pack 2 has a detachable structure, and it can be a battery or a fuel cell. The battery here includes, but is not limited to: lead-acid batteries, nickel-based batteries, sodium-sulfur batteries, and secondary batteries. Lithium batteries, air batteries; fuel cells here include but are not limited to: alkaline fuel cells, phosphoric acid fuel cells, molten carbonate fuel cells, solid oxide fuel cells, proton exchange membrane fuel cells, direct methanol fuel cells, etc.

[0053] In the embodiment of the present invention, by adding the extended range battery pack 2 and the corresponding bidirectional DC/DC module II102, the endurance of the electric vehicle can be significantly improved.

[0054] in figure 1 The motor controller 1 in the electric vehicle mainly has two working modes, namely, the normal working mode and the electric power extended range working mode. The two working modes are described below respectively.

[0055] Among them, in the normal working mode, the motor controller 1 can realize two-way energy transfer between AC and DC. For example, the two-way DC/AC103 module 103 can first convert the single-phase/three-phase AC power provided by the grid into DC power, and then the two-way DC/DC module I101 (or the two-way DC/DC module II102) forwards the DC power to power Battery pack 2 (or extended range battery pack 3) is charged. In addition, the power battery pack 2 (or the extended range battery pack 3) can also convert the stored electric energy to the bus voltage through the bidirectional DC/DC module I102 (or DC/DC module II102), and then pass the bidirectional DC/ The AC module 103 converts the bus voltage into alternating current that meets the required voltage level and frequency, and feeds it to the grid transmission line or provides electrical energy to the load module. The load module here includes but is not limited to: households that require power supply and other electric equipment such as electric vehicles. In addition, when used to drive an electric vehicle, the motor controller 1 can obtain electric energy from the power battery pack 2 and/or the extended-range battery pack 3, and then convert it into alternating current to drive the motor module 4.

[0056] The above is a brief description of the general energy working mode. In the electric range extended mode, the motor controller 1 is connected to the power battery pack 2 and the extended range battery pack 3. Among them, the electric energy of the extended-range battery pack 3 is converted to a DC voltage suitable for driving the motor by the bidirectional DC/DC module II102 to the busbar copper bar, and the DC voltage is converted by the bidirectional DC/DC module I101 to be suitable for charging the power battery pack 2. , So as to charge the power battery 2. In the electric extended range mode, the electric energy stored in the extended range battery pack 3 is transferred to the power battery pack 2 to achieve the purpose of increasing the endurance of the electric vehicle. Here, the extended-range battery pack 2 may be a high-power battery pack or a large-capacity battery pack or other more suitable battery packs. As shown in the figure, the motor controller 1 is connected to the power battery pack 2, the extended-range battery pack 3 and the motor 4. The electric energy of the power battery pack 2 is converted into a DC voltage suitable for driving the motor 4 through the bidirectional DC/DC module I101 to the busbar copper On the row, the extended-range battery pack 2 converts the DC voltage suitable for driving the motor 4 to the busbar copper bar through the bidirectional DC/DCII102; the DC voltage on the wire copper bar is converted to AC through the bidirectional DC/AC103 to drive the motor to run. In this embodiment, the power battery pack 2 and the extended-range battery pack 3 provide electrical energy to the motor 4 at the same time to increase the endurance of the electric vehicle. At this time, the extended-range battery pack 3 may be a high-power battery pack or a large-capacity battery pack or other suitable battery packs. In addition, when the extended-range battery pack 3 is a high-power battery pack, it can simultaneously charge the power battery pack 2 and drive the motor 4; for example, the electric energy stored in the extended-range battery pack 3 is converted into a suitable drive through bidirectional DC/DCII102 The DC voltage of the motor is applied to the bus bar, and the bidirectional DC/DC module I101 converts the voltage of the bus bar to a suitable voltage to charge the power battery pack 2. At the same time, the bidirectional DC/AC module converts the DC power of the bus bar to drive the motor 4 operation.

[0057] More specifically, the topology of the above motor controller can refer to figure 2 with 3 The specific electric vehicle structure shown is shown. in figure 2 with image 3 Among them, switch K1 is a switch for driving battery power, switch K2 is a precharge switch for driving the battery line, switch K3 is a switch for driving battery charge and discharge, switch K4 is a switch for driving battery charge and discharge, and switch K5 is an extended range battery bus Switch, switch K6 is the pre-charge switch of the extended-range battery bus, switch K7 is the switch of charge-discharge of the extended-range battery, switch K8 is the pre-charge switch of the backup battery, switches K9, K10, K11 are the pre-charge switches of the grid, switch K12 , K13, K14 are power grid switch, switch K15 is a single three-phase switch. In addition, it should be noted that due to figure 2 with 3 It is drawn in the form of a specific circuit structure, so those skilled in the art can understand the specific connection relationship and working process through the figure, so further description is omitted.

[0058] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modification, equivalent replacement and improvement made within the spirit and principle of the present invention shall be included in the protection of the present invention. Within range.