CN216794878U

CN216794878U - 12-48VDC-220VAC sine wave power inverter

Info

Publication number: CN216794878U
Application number: CN202023308562.2U
Authority: CN
Inventors: 黄允东; 付金龙
Original assignee: Shanghai Yaoshan Electronic Technology Co ltd
Current assignee: Shanghai Yaoshan Electronic Technology Co ltd
Priority date: 2020-12-31
Filing date: 2020-12-31
Publication date: 2022-06-21
Anticipated expiration: 2030-12-31

Abstract

The utility model discloses a 12-48VDC-220VAC sine wave power inverter, which comprises a shell, wherein two ends of the shell are respectively provided with a connecting seat, and the connecting seats are provided with connecting through holes; the shell is respectively provided with a power supply input end and a power supply output end; a circuit board is arranged in the shell, a full-bridge booster circuit and a full-bridge inverter circuit which are independently designed are arranged on the circuit board respectively, and two-stage conversion of full-bridge boosting and full-bridge inversion is realized; the full-bridge booster circuit is controlled by a PWM control chip and adopts a photoelectric coupler for closed-loop feedback; the full-bridge inverter circuit adopts a digital SPWM control chip, the voltage feedforward control is done to the sampling direct current busbar voltage, and the feedback control is done to the sampling current simultaneously. The utility model adopts two-stage conversion of full-bridge boosting and full-bridge inversion, finally obtains 220V and 50Hz sine wave alternating current on the load, and adopts a high-frequency transformer to realize the isolation between the front stage and the rear stage, thereby being beneficial to improving the safety of the system.

Description

12-48VDC-220VAC sine wave power inverter

Technical Field

The utility model belongs to the field of power inverters, and particularly relates to a 12-48VDC-220VAC sine wave power inverter.

Background

The vehicle-mounted inverter is a power converter, can convert 12-48VDC direct current into AC220V alternating current which is the same as commercial power and is used by general electric appliances, is a convenient vehicle power converter, can be connected with a storage battery to drive the electric appliances and various tools to work by the inverter when people go out for work or travel, and is a commonly-used vehicle electronic product.

A conventional vehicle-mounted inverter is a sine wave inverter. The sine wave inverter generally generates a driving signal in a hardware manner, that is, the hardware generates a sine wave reference and a triangular wave to compare, so as to output the driving signal.

However, the hardware system has the disadvantages of complex circuit structure, difficult upgrading and maintenance, high cost, and difficult debugging, and is gradually replaced by digital control in recent years.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects in the prior art, the utility model aims to provide a 12-48VDC-220VAC sine wave power inverter to overcome the defects in the prior art.

12-48VDC-220VAC sine wave power inverter, including the shell, characterized by: two ends of the shell are respectively provided with a connecting seat, and the connecting seats are provided with connecting through holes; the shell is respectively provided with a power supply input end and a power supply output end; a circuit board is arranged in the shell, a full-bridge booster circuit and a full-bridge inverter circuit which are independently designed are arranged on the circuit board respectively, and two-stage conversion of push-pull boosting and full-bridge inverter is realized; the full-bridge booster circuit is controlled by a PWM control chip and adopts a photoelectric coupler for closed-loop feedback; the full-bridge inverter circuit adopts a digital SPWM control chip, the voltage feedforward control is done to the sampling direct current busbar voltage, and the feedback control is done to the sampling current simultaneously.

In an optimized scheme, the shell comprises an upper shell and a lower shell; the upper shell and the lower shell are respectively provided with corresponding thread seats which are connected together through bolts.

According to the optimized scheme, the full-bridge boost circuit comprises an input protection module, an EMI filter, a power supply filtering module, a PWM control chip, a switching tube Q1, a switching tube Q2, a switching tube Q3, a switching tube Q4, a primary coil and a magnetic core, wherein the input protection module, the EMI filter, the power supply filtering module, the PWM control chip, the switching tube Q1, the switching tube Q2, the switching tube Q3, the switching tube Q4, the primary coil and the magnetic core are mounted on a circuit board; the power supply input end is electrically connected with the EMI filter and the input protection module, the EMI filter is electrically connected with the power supply filtering module, and the power supply filtering module is electrically connected with the switching tube Q1 and the switching tube Q2; the switching tube Q1 is electrically connected with the pre-driving circuit module and the switching tube Q4, and the switching tube Q2 is electrically connected with the other pre-driving circuit module and the switching tube Q3; the input protection module is electrically connected with the system power supply control module; the two pre-drive circuit modules are connected with a PWM control chip; the circuit between the switching tube Q1 and the switching tube Q4 is electrically connected with one end of the primary coil, the switching tube Q2 and the switch Q3 are electrically connected with the other end of the primary coil, and the primary coil is internally provided with a magnetic core.

According to the optimized scheme, the full-bridge inverter circuit comprises a digital SPWM control chip, a secondary coil, a switching tube Q5, a switching tube Q6, a switching tube Q7, a switching tube Q8 and an EMI filtering module; the secondary coil corresponds to the primary coil, the positive electrode of the secondary coil is electrically connected with the switching tube Q5 and the switching tube Q6, the switching tube Q5 is electrically connected with the switching tube Q8, and the switching tube Q6 is electrically connected with the switching tube Q7; the circuit between the switching tube Q5 and the switching tube Q8 is electrically connected with one end of the EMI filtering module, and the circuit between the switching tube Q6 and the switching tube Q7 is electrically connected with the other end of the EMI filtering module; the EMI filtering module is respectively connected with the positive electrode and the negative electrode of an AC220V output power supply.

In an optimized scheme, the SPWM control chip comprises a digital controller, a display module, a function configuration module and a communication module.

In an optimized scheme, a current and voltage detection unit is electrically connected between the full-bridge booster circuit and the full-bridge inverter; the current and voltage detection unit and a communication module on the SPWM control chip are connected with a system state display module, and a plurality of different indicator lamps are arranged on the system state display module; and an HV power supply module is electrically connected between the current and voltage detection unit and the SPWM control chip.

According to the optimized scheme, the PWM control chip and the SPWM control chip are both provided with overvoltage and undervoltage protection modules.

Due to the adoption of the technical scheme, compared with the prior art, the utility model has the beneficial effects that:

the utility model adopts two-stage conversion of full-bridge boosting and full-bridge inversion, finally obtains 220V and 50Hz sine wave alternating current on a load, and adopts a high-frequency transformer to realize the isolation between the front stage and the rear stage, thereby being beneficial to improving the safety of the system.

The utility model adopts a plurality of chips to realize digital control, and also has the protection of overload and short circuit, thereby ensuring the safety performance of the inverter.

The utility model is further illustrated with reference to the figures and examples.

Drawings

FIG. 1 is a schematic overall structure of an embodiment of the present invention;

fig. 2 is a schematic circuit diagram of an embodiment of the present invention.

Detailed Description

Examples

As shown in fig. 1-2, a 12-48VDC-220VAC sine wave power inverter includes a housing. The shell includes shell 1 and lower shell 5, is provided with corresponding screw thread seat 4 on last shell 1 and the lower shell 5 respectively, links together through bolt 3 between the screw thread seat 4.

Two ends of the shell are respectively provided with a connecting seat 2 and a connecting seat 8, and connecting through holes are formed in the connecting seats 2 and the connecting seats 8. The shell is provided with a power input end 7 and a power output end 6 respectively. Be provided with the circuit board in the shell, be provided with independent design's full-bridge boost circuit and full-bridge inverter circuit on the circuit board respectively to realize full-bridge boost and full-bridge inverter two-stage conversion.

The full-bridge boost circuit comprises an input protection module, an EMI filter, a power supply filtering module, a PWM control chip, a switching tube Q1, a switching tube Q2, a switching tube Q3, a switching tube Q4, a primary coil and a magnetic core, wherein the input protection module, the EMI filter, the power supply filtering module, the PWM control chip, the switching tube Q1, the switching tube Q2, the switching tube Q3, the switching tube Q4, the primary coil and the magnetic core are installed on a circuit board. The power supply input end is electrically connected with the EMI filter and the input protection module, the EMI filter is electrically connected with the power supply filtering module, and the power supply filtering module is electrically connected with the switching tube Q1 and the switching tube Q2; the switching tube Q1 is electrically connected with the pre-driving circuit module and the switching tube Q4, and the switching tube Q2 is electrically connected with the other pre-driving circuit module and the switching tube Q3; the input protection module is electrically connected with the system power supply control module; the two pre-drive circuit modules are connected with a PWM control chip; the circuit between the switching tube Q1 and the switching tube Q4 is electrically connected with one end of the primary coil, the switching tube Q2 and the switch Q3 are electrically connected with the other end of the primary coil, and the primary coil is internally provided with a magnetic core.

The full-bridge inverter circuit comprises a digital SPWM control chip, a secondary coil, a switching tube Q5, a switching tube Q6, a switching tube Q7, a switching tube Q8 and an EMI filtering module. The secondary coil corresponds to the primary coil, the positive electrode of the secondary coil is electrically connected with the switching tube Q5 and the switching tube Q6, the switching tube Q5 is electrically connected with the switching tube Q8, and the switching tube Q6 is electrically connected with the switching tube Q7; the circuit between the switching tube Q5 and the switching tube Q8 is electrically connected with one end of the EMI filtering module, and the circuit between the switching tube Q6 and the switching tube Q7 is electrically connected with the other end of the EMI filtering module; the EMI filtering module is respectively connected with the positive electrode and the negative electrode of an AC220V output power supply.

The SPWM control chip comprises a digital controller, a display module, a function configuration module and a communication module. And the PWM control chip and the SPWM control chip are both provided with an over-voltage and under-voltage protection module.

A current and voltage detection unit is electrically connected between the full-bridge booster circuit and the full-bridge inverter; the current and voltage detection unit and a communication module on the SPWM control chip are connected with a system state display module, and a plurality of different indicator lamps are arranged on the system state display module; and an HV power supply module is electrically connected between the current and voltage detection unit and the SPWM control chip.

The utility model adopts multi-level control of a plurality of chips to realize digital control, and also has the protection of overload and short circuit to ensure the safety performance of the inverter.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the equipment or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and equivalent alternatives or modifications according to the technical solution of the present invention and the inventive concept thereof should be covered by the scope of the present invention.

Claims

1.12-48VDC-220VAC sine wave power inverter, including the shell, its characterized in that: two ends of the shell are respectively provided with a connecting seat, and the connecting seats are provided with connecting through holes;

the shell is respectively provided with a power supply input end and a power supply output end;

a circuit board is arranged in the shell, a full-bridge booster circuit and a full-bridge inverter circuit which are independently designed are arranged on the circuit board respectively, and two-stage conversion of full-bridge boosting and full-bridge inversion is realized;

the full-bridge booster circuit is controlled by a PWM control chip and adopts a photoelectric coupler for closed-loop feedback; the full-bridge inverter circuit adopts a digital SPWM control chip, the voltage feedforward control is done to the sampling direct current busbar voltage, and the feedback control is done to the sampling current simultaneously.

2. The 12-48VDC-220VAC sine wave power inverter of claim 1, wherein: the housing comprises an upper housing and a lower housing; the upper shell and the lower shell are respectively provided with corresponding thread seats which are connected together through bolts.

3. The 12-48VDC-220VAC sine wave power inverter of claim 2, wherein: the full-bridge booster circuit comprises an input protection module, an EMI filter, a power supply filtering module, a PWM control chip, a switching tube Q1, a switching tube Q2, a switching tube Q3, a switching tube Q4, a primary coil and a magnetic core, wherein the input protection module, the EMI filter, the power supply filtering module, the PWM control chip, the switching tube Q1, the switching tube Q2, the switching tube Q3, the switching tube Q4, the primary coil and the magnetic core are mounted on a circuit board;

the power supply input end is electrically connected with the EMI filter and the input protection module, the EMI filter is electrically connected with the power supply filtering module, and the power supply filtering module is electrically connected with the switching tube Q1 and the switching tube Q2; the switching tube Q1 is electrically connected with the pre-driving circuit module and the switching tube Q4, and the switching tube Q2 is electrically connected with the other pre-driving circuit module and the switching tube Q3; the input protection module is electrically connected with the system power supply control module; the two pre-drive circuit modules are connected with a PWM control chip; the circuit between the switching tube Q1 and the switching tube Q4 is electrically connected with one end of the primary coil, the switching tube Q2 and the switch Q3 are electrically connected with the other end of the primary coil, and the primary coil is internally provided with a magnetic core.

4. The 12-48VDC-220VAC sine wave power inverter of claim 3, wherein: the full-bridge inverter circuit comprises a digital SPWM control chip, a secondary coil, a switching tube Q5, a switching tube Q6, a switching tube Q7, a switching tube Q8 and an EMI filtering module;

the secondary coil corresponds to the primary coil, the positive electrode of the secondary coil is electrically connected with the switching tube Q5 and the switching tube Q6, the switching tube Q5 is electrically connected with the switching tube Q8, and the switching tube Q6 is electrically connected with the switching tube Q7; the circuit between the switching tube Q5 and the switching tube Q8 is electrically connected with one end of the EMI filtering module, and the circuit between the switching tube Q6 and the switching tube Q7 is electrically connected with the other end of the EMI filtering module; the EMI filtering module is respectively connected with the positive electrode and the negative electrode of an AC220V output power supply.

5. The 12-48VDC-220VAC sine wave power inverter of claim 4, wherein: the SPWM control chip comprises a digital controller, a display module, a function configuration module and a communication module.

6. The 12-48VDC-220VAC sine wave power inverter of claim 5, wherein: a current and voltage detection unit is electrically connected between the full-bridge booster circuit and the full-bridge inverter; the current and voltage detection unit and a communication module on the SPWM control chip are connected with a system state display module, and a plurality of different indicator lamps are arranged on the system state display module; and an HV power supply module is electrically connected between the current and voltage detection unit and the SPWM control chip.

7. The 12-48VDC-220VAC sine wave power inverter of claim 6, wherein: and the PWM control chip and the SPWM control chip are both provided with an over-voltage and under-voltage protection module.