CN215817640U

CN215817640U - Double-input inversion unit

Info

Publication number: CN215817640U
Application number: CN202121115849.5U
Authority: CN
Inventors: 王建; 高崇林; 罗青青; 谭川
Original assignee: WUHAN YONGLI TECHNOLOGY CO LTD
Current assignee: WUHAN YONGLI TECHNOLOGY CO LTD
Priority date: 2021-05-24
Filing date: 2021-05-24
Publication date: 2022-02-11
Anticipated expiration: 2031-05-24

Abstract

The utility model is suitable for the field of power supplies, and provides a double-input inversion unit which comprises a 24V direct-current input circuit, an anti-reverse connection circuit, a modulation driving circuit, a primary inversion circuit, a transformer, a rectification filter circuit and a secondary inversion circuit, wherein the 24V direct-current input circuit, the anti-reverse connection circuit, the modulation driving circuit, the primary inversion circuit, the transformer, the rectification filter circuit and the secondary inversion circuit are sequentially connected. When commercial power is input, the direct switch is made to commercial power output, if no commercial power exists, the DC24V is converted into AV220V through two-stage inversion, transformation and rectification, and the switching circuit is switched to the output; the inverter unit can complete inverter output from DC24V to AV220V, is very stable in circuit control, can ensure stable 220V alternating current output, simultaneously realizes selective output of commercial power and inverter power through a switching circuit, and is very suitable for vehicle-mounted use.

Description

Double-input inversion unit

Technical Field

The utility model belongs to the technical field of power supplies, and particularly relates to a double-input inversion unit.

Background

The inverter circuit generally adopts bridge type inversion, and can convert direct current into alternating current output. The 24V dc is a common voltage of the vehicle power supply, for example, for a solar panel to charge a storage battery, the storage battery outputs 24V dc, but for a vehicle with many high-power vehicle-mounted electrical appliances, the vehicle can be externally connected with a commercial power, but if the commercial power is not connected, if the 24V dc can be converted into 220V ac to be output, the service life of the vehicle can be prolonged. However, there is no inverter unit that receives both 220V ac power input and 24V dc power output.

SUMMERY OF THE UTILITY MODEL

In view of the above problems, the present invention provides a dual-input inverter unit, which is to solve the above technical problems.

The utility model adopts the following technical scheme:

the dual-input inversion unit comprises a 24V direct-current input circuit, an anti-reverse-connection circuit, a modulation drive circuit, a first-level inversion circuit, a transformer, a rectification filter circuit and a second-level inversion circuit which are connected in sequence, the dual-input inversion unit further comprises a switching circuit, a main control circuit and an isolation drive circuit, the switching circuit is provided with two input ports and an output port, one input port is connected with the output end of the second-level inversion circuit, the other input port is used for being connected with a mains supply input, the output port of the switching circuit is an alternating-current output, the control end of the modulation drive circuit is connected to the main control circuit, the main control circuit is further connected to the second-level inversion circuit through the isolation drive circuit, and the output end of the rectification filter circuit is further connected to the main control circuit.

Furthermore, the input end of the reverse connection preventing circuit is also connected with an auxiliary power supply.

Further, a mains supply filter circuit is arranged between the switching circuit and the mains supply input.

Furthermore, the main control circuit is also connected with a display circuit and a communication control circuit.

The utility model has the beneficial effects that: according to the utility model, the output of the 220V alternating current power supply can be switched by arranging the switching circuit, when commercial power is input, the output of the commercial power is directly switched to, if no commercial power exists, the 24V direct current voltage is converted into the 220V alternating current by two-stage inversion, transformation and rectification, and the switching circuit is switched to the output of the switching circuit; the inverter unit can complete inverter output from 24V to 220V, the circuit control is very stable, the 220V alternating current output can be guaranteed to be stable, meanwhile, the selective output of commercial power and inverter power is realized through the switching circuit, and the inverter unit is very suitable for vehicle-mounted use.

Drawings

Fig. 1 is a structural diagram of a dual-input inverter unit according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.

In order to explain the technical means of the present invention, the following description will be given by way of specific examples.

Fig. 1 illustrates a structure of a dual-input inverter unit provided by an embodiment of the present invention, and only a part related to the embodiment of the present invention is illustrated for convenience of description.

As shown in fig. 1, the dual-input inverter unit provided in this embodiment includes a 24V dc input circuit 1, an anti-reverse connection circuit 2, a modulation driving circuit 3, a primary inverter circuit 4, a transformer 5, a rectification filter circuit 6, and a secondary inverter circuit 7, the dual-input inversion unit further comprises a switching circuit 8, a main control circuit 9 and an isolation driving circuit 10, the switching circuit has two input ports and one output port, one input port is connected with the output end of the second-stage inverter circuit 7, the other input port is used for being connected with the commercial power input, the output port of the switching circuit 8 is an alternating current output, the control end of the modulation driving circuit 3 is connected to the main control circuit 9, the main control circuit 9 is further connected to the secondary inverter circuit 7 through the isolation driving circuit 10, and the output end of the rectification filter circuit is further connected to the main control circuit 9.

The inverter unit of the embodiment has two input modes of AC220V and DC24V, when AC220V is input, the inverter unit is in a commercial power output state, and the input AC220V is directly output through a switching circuit; when there is no AC220V input, it may automatically switch to an inverted output state, inverting DC24V to an AC220V output. The inverter unit can supply power for AC220V vehicle-mounted equipment needing uninterrupted power supply.

The main control circuit is used as a control center, the DC24V input is through an anti-reverse connection circuit, the modulation driving circuit adopts an SPWM pulse modulation technology, the frequency of the SPWM pulse wave can be set through the main control circuit, then a pure sine wave with frequency stabilization, voltage stabilization, noise filtering and low distortion degree is output through a primary inverter circuit, after the voltage is boosted through a transformer, the amplified sine wave voltage is changed into direct current again after passing through a rectification filter circuit, the direct current then passes through a secondary inverter circuit, the secondary inverter circuit is controlled through an isolation driving circuit, the target AC220V output is finally obtained, and meanwhile the main control circuit acquires the output voltage data of the rectification filter circuit to perform real-time monitoring.

In addition, the main control circuit 9 is further connected with a display circuit 11 and a communication control circuit 12, the display circuit is used for displaying working parameters of the inverter unit and monitoring voltage and current, and the communication control circuit is used for acquiring internal data of the main control circuit and achieving communication control and data acquisition with the inverter unit.

The input end of the reverse connection preventing circuit 2 is also connected with an auxiliary power supply 13, the auxiliary power supply is a vehicle-mounted storage battery, generally, a lithium battery can be adopted, the cycle performance is good, the weight is light, and the service life is long. The auxiliary power supply is also a 24V power supply output, and is convenient for subsequent replacement and maintenance. In addition, the auxiliary power supply is also provided with a charging control module, and when the auxiliary power supply is connected with the mains supply, the auxiliary power supply can be charged through the charging control module.

Finally, a mains supply filter circuit 14 is further arranged between the switching circuit 8 and the mains supply input to ensure the stability of the input power supply.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. The utility model provides a dual-input inversion unit, its characterized in that, includes the 24V direct current input circuit who connects in order, prevents reverse connection circuit, modulation drive circuit, one-level inverter circuit, transformer, rectification filter circuit, second grade inverter circuit, dual-input inversion unit still includes switching circuit, master control circuit and isolation drive circuit, switching circuit has two input ports and an output port, one of them input port with second grade inverter circuit's output is connected, and another input port is used for with commercial power input connection, switching circuit's output port is AC output, modulation drive circuit's control end is connected to master control circuit, master control circuit still passes through isolation drive circuit is connected to second grade inverter circuit, rectification filter circuit's output still is connected to master control circuit.

2. The dual-input inversion unit of claim 1, wherein an auxiliary power supply is further connected to an input terminal of the anti-reverse connection circuit.

3. The dual-input inverter unit of claim 2, wherein a mains filter circuit is further disposed between the switching circuit and the mains input.

4. The dual-input inverter unit of claim 3, wherein the main control circuit is further connected with a display circuit and a communication control circuit.