CN203774850U - Multifunctional integrated electric vehicle-mounted charger with mode switch function - Google Patents

Abstract

The utility model proposes a multifunctional integrated electric vehicle on-board charger with a mode switching function, which includes a front-end filter module, a first rectifier module, a power factor correction module, a first filter module, an inverter module, and a transformer connected in sequence , a second rectification module, and a second filter module. The transformer includes at least one primary winding coil and two secondary winding coils, a first secondary winding coil and a second secondary winding coil. The second rectifier module is connected to the first secondary winding coil through the second switch, the second filter module is connected to the power battery, and the power battery is connected to the input end of the first filter module through the third switch. The charger also includes a third rectifying module and a third filtering module sequentially connected to the second secondary winding coil. The utility model can realize the functions of the AC-DC charger and the DC converter, reduce the cost of the vehicle-mounted charger, reduce the weight and volume, realize electrical isolation, and have high energy conversion efficiency.

Description

Multifunctional integrated electric vehicle on-board charger with mode switching function

technical field

The utility model belongs to the technical field of electric vehicle charging and relates to a vehicle-mounted charger for electric vehicles.

Background technique

Environmental and energy issues are becoming more and more prominent in today's world. Electric vehicles have become a hot spot in the research and development of the automobile industry. However, the marketization of electric vehicles is still hindered by some key technologies. Among them, one of the more prominent technologies is the charging technology of electric vehicles.

Electric vehicle chargers are an important part of electric vehicles. At present, electric vehicle chargers can be divided into off-board chargers and on-board chargers. For electric vehicles, the role of the traditional on-board charger is to charge the high-voltage power battery with the alternating current of the public grid. The traditional on-board charger includes the following parts: electromagnetic interference (EMI) filter, input rectification module, power factor correction (PFC) module, input filter, inverter module, transformer, output rectification module, output filter; the inverter The module, the transformer, the output rectification module, and the output filter constitute a DC-DC conversion unit, which realizes the DC-DC conversion function. The vehicle-mounted DC converter (DCDC) is used for high-voltage power batteries to charge low-voltage batteries. The functions of the DC-DC converter and the DC-DC conversion unit in the vehicle charger are similar, but the two are generally separated, that is, for The public grid charges the power battery and the power battery charges the low-voltage battery. In principle, two DCDC devices are included, so the on-board charger has high cost, large volume and single function.

Utility model content

The purpose of the utility model is to provide an on-board charger which can not only use the AC power of the public grid to charge the high-voltage power battery and the low-voltage storage battery when the vehicle is required to be charged, but also use the high-voltage power battery to charge the low-voltage storage battery when the vehicle is running.

In order to achieve the above object, the solution of the present utility model is:

A multifunctional integrated electric vehicle on-board charger with a mode switching function, including a front-end filter module, a first rectifier module, a power factor correction module, a first filter module, an inverter module, a transformer, and a second rectifier module connected in sequence , a second filtering module; the transformer at least includes a primary winding coil and two secondary winding coils, a first secondary winding coil and a second secondary winding coil; the second rectification module is connected to the The first secondary winding coil is used to rectify the alternating current output by the first secondary winding coil into direct current; the second filtering module is connected to the power battery of the vehicle where it is located; the power battery is connected to the first power battery through a third switch. The input end of the filter module; the charger also includes a third rectifier module and a third filter module connected in turn to the second secondary winding coil; the third filter module is connected to the battery of the car where it is located to filter out The pulsating component in the direct current output by the third rectification module; the third rectification module is used to rectify the alternating current output by the second secondary winding coil into direct current.

The on-board charger further includes a first switch, the first switch is connected to the on-board charger and the public power grid, and serves as an interface between the on-board charger and the public power grid.

The front-end filtering module is a front-end filter.

The front-end filter is an electromagnetic interference filter.

The first filtering module is a first filter.

The second filtering module is a second filter.

The third filtering module is a third filter.

The battery is a 12 volt battery.

Due to the adoption of the above scheme, the beneficial effects of the utility model are: the utility model has a multifunctional integrated electric vehicle on-board charger with mode switching function to expand the function of the on-board charger, and can realize the function of the AC and DC charger. The public power grid charges the high-voltage power battery and the low-voltage battery; it can also realize the function of a DC converter, and the high-voltage power battery charges the low-voltage battery. Therefore, the cost of the on-board charger is reduced, and the weight and volume are reduced. In addition, the utility model realizes electrical isolation and has high energy conversion efficiency.

Description of drawings

Fig. 1 is the composition schematic diagram of the on-board charger in the utility model embodiment;

Fig. 2 is an energy flow diagram when the vehicle-mounted charger realizes the function of an AC/DC charger in an embodiment of the utility model;

Fig. 3 is an energy flow diagram when the on-board charger realizes the function of a DC converter in the embodiment of the utility model.

In the drawings: 101, the first switch; 102, the second switch; 103, the third switch; 2, the transformer; 21, the primary winding coil; 2201, the first secondary winding coil; 2202, the second secondary winding coil .

Detailed ways

Below in conjunction with the embodiment shown in the accompanying drawings the utility model is further described.

The utility model proposes a multifunctional integrated electric vehicle on-board charger with a mode switching function, and its composition schematic diagram is shown in Fig. 1 . The on-board charger includes a first switch 101, an EMI filter, a first rectifier module, a PFC module, a first filter, an inverter module, and a transformer 2 with one winding coil on the primary side and two winding coils on the secondary side connected in sequence , a second rectification module, and a second filter; wherein, the first switch 101 is connected to the EMI filter and the public power grid, the second rectification module is connected to the first secondary winding coil 2201 of the transformer 2, and the second filter is connected to the high voltage of the vehicle Power Battery. The on-board charger also includes a third rectifier module and a third filter sequentially connected to the second secondary winding coil 2202 of the transformer 2; wherein, the third filter is also connected to the low-voltage 12-volt battery of the vehicle. A second switch 102 is arranged between the first secondary winding coil 2201 of the transformer 2 and the second rectifier module, and the high-voltage power battery and the input end of the first filter are connected through the third switch 103 .

In the on-board charger, the first switch 101 is the interface between the on-board charger and the public power grid; the EMI filter is used to filter out high-order harmonics from the public power grid; the first rectifier module is used to rectify the alternating current of the public power grid into pulses direct current; the PFC module is used to improve the power factor and reduce the harmonics of the on-board charger input to the public grid; the first filter is used to filter out the pulsating components in the direct current output by the PFC module; the inverter module is used to output the first filter The DC power is converted into AC power; the transformer 2 is used to realize voltage transformation and energy transmission; the second rectification module is used to rectify the AC power output by the first secondary winding coil 2201 of the transformer 2 into DC power; the second filter is used to filter out the first The pulsating components in the direct current output by the second rectification module; the third rectification module is used to rectify the alternating current output by the second secondary winding coil 2202 of the transformer 2 into direct current; the third filter is used to filter out the direct current output by the third rectification module pulsating components. The high-voltage power battery is the power source of the electric vehicle, and the low-voltage battery is the 12-volt battery onboard the electric vehicle.

The first switch 101 and the third switch 103 are used to switch between different functions of the on-board charger. The first switch 101 and the second switch 102 are turned on or off synchronously, that is, at any moment, both the first switch 101 and the second switch 102 are in a closed state or both are in an open state. At any moment, only one of the second switch 102 and the third switch 103 is in the closed state, while the other is in the open state. Therefore, by controlling the first switch 101 , the second switch 102 and the third switch 103 , the charger can be controlled to switch between the AC/DC charger function and the DC converter function. When the first switch 101 is controlled to be closed, the second switch 102 is closed, and the third switch 103 is opened, the AC/DC charger function is realized; and when the first switch 101 is opened, the second switch 102 is opened, and the third switch 103 is closed , realize the function of DC converter.

Fig. 2 is an energy flow diagram when the on-board charger realizes the function of an AC/DC charger, and the direction of the arrow in Fig. 2 indicates the direction of energy flow. At this time, the first switch 101 is closed, the second switch 102 is closed, and the third switch 103 is opened. The energy of the public grid flows to the primary side of the transformer 2 through the EMI filter, the first rectifier module, the PFC module, the first filter, and the inverter module in sequence, and the energy flowing to the transformer 2 is output from its two secondary winding coils, and from the second The energy output by a secondary winding coil 2201 flows to the high-voltage power battery through the second rectification module and the second filter; the energy output from the second secondary winding coil 2202 flows to the low-voltage 12-volt battery through the third rectification module and the third filter , so as to realize the simultaneous charging of the high-voltage power battery and the low-voltage 12-volt battery by using the alternating current of the public grid.

Fig. 3 is an energy flow diagram when the on-board charger realizes the function of a DC converter, and the direction of the arrow in Fig. 3 indicates the direction of energy flow. At this time, the first switch 101 is turned off, the second switch 102 is turned off, and the third switch 103 is turned on. The energy output by the high-voltage power battery flows to the primary side of the transformer 2 through the first filter and the inverter module, and the energy flowing to the transformer 2 flows out from the second secondary winding coil 2202 of the transformer 2, and passes through the third rectification module and the third filter It flows to the low-voltage 12-volt battery, so as to realize the DC voltage conversion from the high-voltage power battery to the low-voltage 12-volt battery.

The utility model has a multifunctional integrated electric vehicle on-board charger with a mode switching function, which expands the functions of the on-board charger and can realize the function of an AC and DC charger, and can charge a high-voltage power battery and a low-voltage 12-volt storage battery from a public grid when needed. ; It can also realize the function of the DC converter, charging the low-voltage 12-volt storage battery from the high-voltage power battery. Therefore, the cost of the on-board charger is reduced, and the weight and volume are reduced. In addition, the utility model realizes electrical isolation and has high energy conversion efficiency.

The above description of the embodiments is for those of ordinary skill in the technical field to understand and use the utility model. It is obvious that those skilled in the art can easily make various modifications to these embodiments, and apply the general principles described here to other embodiments without creative effort. Therefore, the utility model is not limited to the above-mentioned embodiments, and improvements and modifications made by those skilled in the art according to the disclosure of the utility model without departing from the category of the utility model should be within the protection scope of the utility model.

Claims (8)

1. A multifunctional integrated electric vehicle on-board charger with a mode switching function, comprising a front-end filter module, a first rectifier module, a power factor correction module, a first filter module, an inverter module, a transformer, and a second The rectifier module and the second filter module are characterized in that: the transformer includes at least one primary winding coil and two secondary winding coils of the first secondary winding coil and the second secondary winding coil; the second rectifying module passes The second switch is connected to the first secondary winding coil to rectify the alternating current output by the first secondary winding coil into direct current; the second filter module is connected to the power battery of the vehicle; the power battery passes through the third A switch is connected to the input end of the first filtering module; The charger also includes a third rectifier module and a third filter module sequentially connected to the second secondary winding coil; the third filter module is connected to the battery of the vehicle where it is located to filter out the third rectifier module The pulsating component in the output direct current; the third rectification module is used to rectify the alternating current output by the second secondary winding coil into direct current. 2. The multifunctional integrated electric vehicle on-board charger with mode switching function according to claim 1, characterized in that: the on-board charger also includes a first switch, and the first switch is connected to the on-board charger and the public grid as the interface between the on-board charger and the public grid. 3. The multifunctional integrated electric vehicle on-board charger with mode switching function according to claim 1, wherein the front-end filter module is a front-end filter. 4. The multifunctional integrated electric vehicle on-board charger with mode switching function according to claim 3, wherein the front-end filter is an electromagnetic interference filter. 5. The multifunctional integrated electric vehicle on-board charger with mode switching function according to claim 1, wherein the first filter module is a first filter. 6. The multifunctional integrated electric vehicle on-board charger with mode switching function according to claim 1, wherein the second filter module is a second filter. 7. The multifunctional integrated electric vehicle on-board charger with mode switching function according to claim 1, wherein the third filter module is a third filter. 8. The multifunctional integrated electric vehicle on-board charger with mode switching function according to claim 1, characterized in that: the battery is a 12-volt battery.