CN206948207U - A kind of three-phase power special inverter - Google Patents

Abstract

The utility model discloses a special inverter power supply for three-phase electric power, which comprises an input module, an inverter module, a control module, a drive module, a switching power supply, a voltage stabilizing module and an AC output air switch module, and the input module includes a DC input and an AC input The circuit breaker, the inverter module includes three single-phase inverter modules, the control module includes a controller, the switching power supply is a weak current power supply drawn from the DC input and AC input circuit breaker, and the switching power supply is connected to the controller for powering the controller. The power supply is provided, and the controller controls the three single-phase inverter modules through the driving module. The voltage stabilizing module includes six groups of voltage stabilizing circuits, and the output terminals of the three single-phase inverter modules are respectively connected to a group of voltage stabilizing circuits. The special inverter power supply for three-phase electric power of the utility model can be controlled and switched according to local actual conditions, adopts DC input or AC input, and uses three independent single-phase transformers for output, and has strong load capacity.

Description

A special inverter power supply for three-phase power

technical field

The utility model relates to the field of electric power sources, in particular to a special inverter power supply for three-phase electric power.

Background technique

Solar photovoltaic power generation is an important part of the long-term energy strategy supported by multinational governments including my country, and has been widely used, and the inverter is an important part of the entire solar photovoltaic power generation system. Inverters are classified according to the number of output phases, and can be divided into single-phase inverters and three-phase inverters. The main function of the three-phase special inverter power supply is to convert DC power into AC power. The main function of the DC inverter or the main use of the AC bypass can be determined according to the actual situation of the local area, and the switching is controlled by a static switch. However, the development of power supply products in today's era has been developed and changed to a certain extent, but there are still some problems: it is easy to be interfered and malfunction. At the same time, its own electromagnetic compatibility is poor, and it interferes with other hosts from two aspects of radiation and conduction, posing a great threat. In addition, the volume is large, the noise is extremely loud, and the heat is severe; the independent inverter body system is not perfect in intelligence, phase-controlled, large in size, large in field area, heavy in weight, high in component costs, high in maintenance costs, and inverter failures. High, short life; poor output waveform, high harmonic content. Its output is generally a square wave or a modified sine wave, which is not suitable for a network with high requirements, and may easily cause network errors; there is no output isolation transformer, and its load capacity is poor, so it cannot cope with the use of capacitive loads. .

Utility model content

The purpose of this utility model is to overcome the above disadvantages and provide a special inverter power supply for three-phase electric power, which can be controlled and switched to adopt DC input or AC input according to local actual conditions.

The purpose of this utility model is achieved in this way: a special inverter power supply for three-phase electric power, which is characterized in that it includes an input module, an inverter module, a control module, a drive module, a switching power supply, a voltage stabilizing module and an AC output circuit breaker module ,

Among them, the input module includes DC input and AC input circuit breakers, the inverter module includes three single-phase inverter modules, the control module includes a controller, the switching power supply is a weak current power supply drawn from the DC input and AC input circuit breakers, and the switching power supply It is connected with the controller to provide power to the controller. The controller controls three single-phase inverter modules through the drive module. The voltage stabilization module includes six sets of voltage stabilization circuits. The output terminals of the three single-phase inverter modules are respectively Connect a set of voltage stabilizing circuits. The AC input circuit breaker includes AC input A, AC input B, AC input C and AC input N. There is a voltage stabilizing circuit 1 connected between AC input A and AC output a, and AC input B and AC output A voltage stabilizing circuit 2 is connected between b, and a voltage stabilizing circuit 3 is connected between the AC input C and the AC output c.

Further, it also includes a display module, the display module is respectively connected to the switching power supply and the control module, and the display unit includes an LCD display, and the LCD display is used to display the operating status and fault information of the equipment.

Further, the six sets of voltage stabilizing circuits respectively include two antiparallel voltage stabilizing diodes.

Further, two sets of capacitor branches are connected in parallel at both ends of the DC input, and the two sets of capacitor branches respectively include two series-connected polarized capacitors.

Further, the three single-phase inverter modules respectively include an inverter module and an output transformer module, the inverter module is a MOSFET inverter circuit, and the output transformer module includes an output transformer and a CBB capacitor connected in parallel at both ends of the output transformer.

The utility model has the advantages of: the controller adopts DSP control technology, which can output standard sine waves, and the waveform distortion is lower; the design of power frequency isolation transformer is adopted, and the safety and stability are improved; the output of 46~54HZ inverter is automatic Tracking bypass frequency technology and uninterrupted switching technology make power switching natural and shock-free, ensuring the high reliability power supply requirements of the load; three independent single-phase transformer outputs are used, and the load capacity is strong.

Description of drawings

Fig. 1 is the circuit structural diagram of the three-phase power dedicated inverter power supply of the present invention.

detailed description

Below in conjunction with accompanying drawing, the utility model is further described.

The utility model is a special inverter power supply for three-phase electric power, which is characterized in that it includes an input module, an inverter module, a control module, a drive module, a switching power supply, a voltage stabilizing module, a display module and an AC output circuit breaker module,

Among them, the input module includes DC input and AC input circuit breakers, the inverter module includes three single-phase inverter modules, the control module includes a controller, the switching power supply is a weak current power supply drawn from the DC input and AC input circuit breakers, and the switching power supply It is connected with the controller to provide power to the controller. The controller controls three single-phase inverter modules through the drive module, which is used to control the inverter power supply to follow the reference mains and maintain the same phase and frequency with it, automatically Adjust the power supply within the specified range and operate according to the set protection value. The three single-phase inverter modules include an inverter module and an output transformer module. The inverter module is a MOSFET inverter circuit, and the output transformer The voltage module includes an output transformer and CBB capacitors connected in parallel at both ends of the output transformer. The voltage regulator module includes six sets of voltage regulator circuits. Connect a group of voltage stabilizing circuits respectively. The display module is respectively connected to the switching power supply and the control module. The display unit includes an LCD display, which is used to display the operating status and fault information of the equipment. The AC input circuit breaker includes AC input A, AC input B. AC input C and AC input N, a voltage stabilizing circuit 1 is connected between AC input A and AC output a, a voltage stabilizing circuit 2 is connected between AC input B and AC output b, and a voltage stabilizing circuit 2 is connected between AC input C and AC output c There is a voltage stabilizing circuit 3 connected between them, and two sets of capacitor branches are connected in parallel at both ends of the DC input, and the two sets of capacitor branches respectively include two series-connected polarized capacitors.

Finally, it should be noted that: obviously, the above-mentioned embodiments are only examples for clearly illustrating the present application, rather than limiting the implementation manner. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. It is not necessary and impossible to exhaustively list all the implementation manners here. However, the obvious changes or variations derived therefrom are still within the scope of protection of the present application.

Claims (5)

1. a kind of three-phase power special inverter, it is characterised in that including input module, inversion module, control module, driving Module, Switching Power Supply, Voltage stabilizing module are spaced apart module with output is exchanged,

The input module includes direct current and inputs and exchange input and be spaced apart, and inversion module includes three single-phase inverter modules, institute Stating control module includes controller, and the Switching Power Supply is that direct current inputs and inputs the light current power supply for being spaced apart middle extraction, institute with exchange State Switching Power Supply to be connected with controller, for providing power supply to controller, the controller controls three by drive module Single-phase inverter module, the Voltage stabilizing module include six groups of mu balanced circuits, three single-phase inverter module output end difference One group of mu balanced circuit is connected, the exchange input is spaced apart including exchange input A, exchange input B, exchange input C and exchanges input N, the exchange input A are connected with mu balanced circuit 1 between output a with exchange, and the exchange input B connects between b with exchanging to export It is connected to mu balanced circuit 2, the exchange input C is connected with mu balanced circuit 3 between c with exchange to export.

A kind of 2. three-phase power special inverter according to claim 1, it is characterised in that also including display module, The display module difference connecting valve power supply and control module, the display unit include LCD display, and the LCD is shown Shield the running status and fault message for display device.

A kind of 3. three-phase power special inverter according to claim 1, it is characterised in that mu balanced circuit described in six groups Include the voltage-regulator diode of two reverse parallel connections respectively.

4. a kind of three-phase power special inverter according to claim 1, it is characterised in that direct current input both ends are in parallel Have two groups of capacitive branch, capacitive branch described in two groups respectively include two series connection have electrode capacitance.

A kind of 5. three-phase power special inverter according to claim 1, it is characterised in that three single-phase inversions Device module includes inversion module and output voltage changing module respectively, and the inversion module is MOSFET inverter circuits, and the output becomes Die block includes output transformer and is connected in parallel on the CBB electric capacity at output transformer both ends.