Single-phase and three-phase compatible PFC circuit and vehicle-mounted charger

Abstract

The utility model discloses a single-phase and three-phase compatible PFC circuit and a vehicle-mounted charger, comprising an AC input side module, a three-phase and three-level PFC module, a pre-charging switch module and an N line, the AC input side module is used for providing single-phase and three-phase live wire input branches, the three-phase and three-level PFC module is electrically connected with a bus, and the bus is electrically connected with the pre-charging switch module. The pre-charging switch module is electrically connected with the alternating current input side module and the three-phase three-level PFC module, and the N line is electrically connected to the bus midpoint of the direct current side of the three-phase three-level PFC module, so that compatibility of three-phase and single-phase input is realized, additional control circuits are not needed, the circuit is simple, and a control strategy is effectively simplified.

Description

TECHNICAL FIELD

[0001] The utility model relates to charging machine circuit control technical field especially, relates to a single -phase three -phase compatible PFC circuit and vehicle charger. BACKGROUND

[0002] Vehicle charger generally includes two parts, namely AC-DC and DC-DC, the former realizes power factor correction and the function of stable bus voltage, and the latter realizes the function of constant voltage or constant current charging for battery through isolation conversion of DC bus voltage.

[0003] The common vehicle charger currently has 3.3kW, 6.6kW, 11kW according to power, and single -phase input, three -phase input and single -phase three -phase compatible input according to input voltage.These AC-DC (power factor correction) parts of vehicle charger mainly have the following: Boost PFC, three -phase three -level or three -phase two -level rectifier, three -phase single -phase compatible PFC circuit, and the above correction circuits cannot provide zero line, can only use three -phase electricity, and have no three -phase input function applied to N line. SUMMARY

[0004] The utility model provides a single -phase three -phase compatible PFC circuit to solve the technical problems in the prior art.

[0005] To achieve the above technical purpose, the utility model adopts the technical scheme as follows in the first aspect:

[0006] A single -phase three -phase compatible PFC circuit, it includes AC input side module, three -phase three -level PFC module, pre -charge switch module and N line, AC input side module is used to provide single -phase and three -phase fire line input branch, three -phase three -level PFC module electrically connected with bus, pre -charge switch module is electrically connected with AC input side module and three -phase three -level PFC module respectively, and N line is electrically connected in the bus midpoint of the DC side of three -phase three -level PFC module.

[0007] Preferably, the single -phase three -phase compatible PFC circuit further includes a filter module electrically connected to the DC side of the three -phase three -level PFC module.

[0008] Preferably, the filter module includes a first capacitor and a second capacitor, and the first capacitor and the second capacitor are respectively electrically connected to the DC side of the three -phase three -level PFC module, wherein the first capacitor is an upper half bus capacitor, and the second capacitor is a lower half bus capacitor.

[0009] Preferably, the pre -charge switch module includes three switch branches, and the three switch branches are respectively electrically connected to the three fire line input branches in the AC input side module, and the switch branch is connected in parallel with the fire line input branch.

[0010] Preferably, the switch branch comprises a relay.

[0011] Preferably, the live input branch is electrically connected with a pre-charge PTC resistor, and the switch branch is connected in parallel with the pre-charge PTC resistor.

[0012] Preferably, at least one live input branch is connected in parallel with a sub-branch, wherein the sub-branch is free of connected components.

[0013] The utility model discloses a single-phase three-phase compatible PFC circuit in the first aspect, which comprises a live input branch, a neutral input branch and a switch branch.

[0014] Compared with the prior art, the utility model has the following beneficial technical effects: it comprises an AC input side module, a three-phase three-level PFC module, a pre-charge switch module and an N line, the AC input side module is used for providing three live input branches of single-phase and three-phase, the three-phase three-level PFC module is electrically connected with a bus, the pre-charge switch module is electrically connected with the AC input side module and the three-phase three-level PFC module respectively, the pre-charge switch module is used for controlling the on-off of at least one live input branch and the three-phase three-level PFC module, the N line is electrically connected with the bus midpoint of the DC side of the three-phase three-level PFC module, the compatibility of three-phase and single-phase input is realized, additional control circuit is not needed, the circuit is simple, and the control strategy is effectively simplified. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a structural state schematic view of the utility model embodiment.

[0016] Reference numerals:

[0017] 100 AC input side module, 101 live input branch, 102 pre-charge PTC resistor,

[0018] 200 three-phase three-level PFC module,

[0019] 300 pre-charge switch module, 301 switch branch,

[0020] 400 N line,

[0021] 500 filter module, 501 first capacitor, 502 second capacitor. DETAILED DESCRIPTION

[0022] It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict.

[0023] In the description of the utility model, it needs to understand that, the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the indicated device or group must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" and the like can explicitly or implicitly include one or more features. In the description of the utility model, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0024] In the description of the utility model, it needs to be explained that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be connected, or it can be connected; It can be mechanically connected, or it can be electrically connected; It can be directly connected, or it can be indirectly connected through an intermediate medium, and it can be connected between two groups. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood through specific circumstances.

[0025] The specific embodiments of the utility model will be described in detail below with reference to the drawings.

[0026] As Figure 1 The utility model discloses a single-phase three-phase compatible PFC circuit in the first aspect, it includes AC input side module 100, three-phase three-level PFC module 200, precharge switch module 300 and N line 400, AC input side module 100 is used to provide single-phase and three-phase three fire line input branch 101, three-phase three-level PFC module 200 electrically connected with bus, precharge switch module 300 is electrically connected with AC input side module 100 and three-phase three-level PFC module 200 respectively, precharge switch module 300 is used to control at least one fire line input branch 101 and the on-off of three-phase three-level PFC module 200, N line 400 is electrically connected in the bus midpoint of the DC side of three-phase three-level PFC module 200.

[0027] Specifically, when the three live input branches 101 in the alternating current input side module 100 perform three-phase input, each phase is controlled separately, the power factor of each phase is controlled according to the control method of the classic boost-pfc, and thus, even if the three-phase input, it can be regarded as single-phase electricity with a phase difference of 120° to control, and the actual effect achieved is three-phase control. The power factor correction is realized, and the bus voltage is also stabilized.

[0028] When one of the live input branches 101 performs single-phase input, the live wire can be divided into three branches and connected to the VA, VB, and VC terminals respectively, and the zero line is connected to the N line terminal. The control method is completely controlled according to the method when the three-phase input is controlled, and the difference is that it can be regarded as single-phase electricity with a phase difference of 0° to control, and the actual effect achieved is single-phase control. The power factor correction is also realized, and the bus voltage is stabilized.

[0029] Further, the single-phase three-phase compatible PFC circuit further comprises a filtering module 500 electrically connected to the direct current side of the three-phase three-level PFC module 200.

[0030] Specifically, the three-phase three-level PFC module 200 is specifically a three-level converter, and the direct current side filtering of the three-level converter needs to pay special attention to the midpoint potential balance problem, so the filtering module 500 is added on the direct current side to absorb high-frequency pulsation, ensure the smoothness of the direct current bus voltage, provide a stable direct current power supply for the rear circuit, reduce the midpoint potential fluctuation, attenuate high-frequency noise components, reduce conducted electromagnetic interference, and further improve the service life of each component in the circuit.

[0031] Further, the filtering module 500 comprises a first capacitor 501 and a second capacitor 502, which are respectively electrically connected to the direct current side of the three-phase three-level PFC module 200, wherein the first capacitor 501 is an upper half bus capacitor, and the second capacitor 502 is a lower half bus capacitor.

[0032] Specifically, the two half bus voltages of the direct current side of the three-level converter 403 include an upper half bus voltage and a lower half bus voltage, and the voltage across the branch composed of the first capacitor 405 and the second capacitor 406 is a full bus voltage, which can also be referred to as a bus voltage. Illustratively, the upper half bus voltage or the lower half bus voltage is half of the bus voltage. Understandably, according to any two known voltage values among the upper half bus voltage, the lower half bus voltage, and the bus voltage, the remaining unknown voltage value can be obtained. The bus voltage, the upper half bus voltage, and the lower half bus voltage can be regarded as the power supply voltage to the load, and in some embodiments, the power supply signal can be an alternating current power supply signal of the mains.

[0033] Further, the pre-charge switch module 300 includes three switch branches 301, the three switch branches 301 are respectively electrically connected with the three live wire input branches 101 in the AC input side module 100, the switch branch 301 is connected with the live wire input branch 101 in parallel, and the switch branch 301 includes a relay.

[0034] Specifically, the three switch branches 301 control the three live wire input branches 101 to be turned on and turned off based on corresponding control algorithms, so that the switching between three-phase input and single-phase input is realized, efficient conversion of electric energy, waveform shaping and system protection are realized, and only three switch branches 301 are used, so that a three-phase PFC system with high power density and high reliability is realized.

[0035] Further, the live wire input branch 101 is electrically connected with a pre-charge PTC resistor 102, and the switch branch 301 is connected with the pre-charge PTC resistor 102 in parallel. At least one live wire input branch 101 is connected with a sub-branch, wherein no connecting components are connected on the sub-branch.

[0036] The utility model provides a kind of vehicle-mounted charger in the second aspect, including the single-phase three-phase compatible PFC circuit of any one of above scheme.

[0037] The above is one or more embodiments provided in combination with specific content, and the specific implementation of the utility model is not limited to these descriptions. Any approximation, similarity or replacement of the method and structure of the utility model, or any technical deduction or replacement under the concept of the utility model, should be regarded as the protection scope of the utility model.

Claims

1. A single phase three phase compatible PFC circuit, characterized by, The application relates to a single-phase three-phase compatible PFC circuit. The application relates to a single-phase three-phase compatible PFC circuit. The application relates to a single-phase three-phase compatible PFC circuit. The application relates to a single-phase three-phase compatible PFC circuit. The application relates to a single-phase three-phase compatible PFC circuit.

2. A single phase three phase compatible PFC circuit as claimed in claim 1, wherein, The application relates to a single-phase three-phase compatible PFC circuit.

3. A single phase three phase compatible PFC circuit as claimed in claim 2, wherein, The application relates to a single-phase three-phase compatible PFC circuit.

4. A single phase three phase compatible PFC circuit as claimed in claim 1 wherein, The application relates to a single-phase three-phase compatible PFC circuit.

5. A single phase three phase compatible PFC circuit as claimed in claim 4, wherein, The application relates to a single-phase three-phase compatible PFC circuit.

6. A single phase three phase compatible PFC circuit as claimed in claim 4 wherein, The application relates to a single-phase three-phase compatible PFC circuit.

7. An on-board charger, characterized by, The application relates to a single-phase three-phase compatible PFC circuit. The application relates to a single-phase three-phase compatible PFC circuit. The application relates to a single-phase three-phase compatible PFC circuit. The application relates to a single-phase three-phase compatible PFC circuit. The application relates to a single-phase three-phase compatible PFC circuit. The application relates to a single-phase three-phase compatible PFC circuit. The application relates to a single-phase three-phase compatible PFC circuit. The application relates to a single-phase three-phase compatible PFC circuit. The application relates to a single-phase three-phase compatible PFC circuit. The application relates to a single-phase three-phase compatible PFC circuit. The application relates to a single-phase three-phase compatible PFC circuit. The application relates to a single-phase three-phase compatible PFC circuit. The application relates to a single-phase three-phase compatible PFC circuit. The application relates to a single-phase three-phase compatible PFC circuit. The application relates to a single-phase three-phase compatible PFC circuit. The application relates to a single-phase three-phase compatible PFC circuit. The application relates to a single-phase three-phase compatible PFC circuit. The application relates to a single-phase three-phase compatible PFC circuit. The application relates to a single-phase three-phase compatible PFC circuit. The application relates to a single-phase three-phase compatible PFC circuit. The application relates to a single-phase three-phase compatible PFC circuit. The application relates to a single-phase three-phase compatible PFC circuit. The application relates to a single-phase three-phase compatible PFC circuit. The application relates to a single-phase three-phase compatible PFC circuit. The application relates to a single-phase three-phase compatible PFC circuit. The application relates to a single-phase three-phase compatible PFC circuit. The application relates to a single-phase three-phase compatible PFC circuit. The application relates to a single-phase three-phase compatible PFC circuit. The application relates to a single-phase three-phase compatible PFC circuit. The application relates to a single-phase three-phase compatible PFC circuit. The application relates to a single-phase three-phase compatible PFC circuit. The application relates to a single-phase three-phase compatible PFC circuit. The application relates to a single-phase three-phase compatible PFC circuit. The application relates to a single-phase three-phase compatible PFC circuit. The application relates to a single-phase three-phase compatible PFC circuit. The application relates to a single-phase three-phase compatible PFC circuit. The application relates to a single-phase three-phase compatible PFC circuit. The application relates to a single-phase three-phase compatible PFC circuit. The application relates to a single-phase three-phase compatible PFC circuit. The application relates to a single-phase three-phase compatible PFC circuit. The application relates to a single-phase three-phase compatible PFC circuit. The application relates to a single-phase three-phase compatible PFC circuit. The application relates to a single-phase three-phase compatible PFC circuit. The application relates to a single-phase three-phase compatible PFC circuit. The application relates to a single-phase three-phase compatible PFC circuit. The application relates to a single-phase three-phase compatible PFC circuit. The application relates to a single-phase three-phase compatible PFC circuit. The application relates to a single-phase three-phase compatible PFC circuit. The application relates to a single-phase three-phase compatible PFC circuit. The application relates to a single-phase three-phase compatible PFC circuit. The application relates to a single-phase three-phase compatible PFC circuit. The application relates to a single-phase three-phase compatible PFC

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