CN204835937U - Three -phase photovoltaic grid -connected inverter power that ages - Google Patents

Abstract

The utility model relates to the technical field of inverters, and discloses an aging power supply for a three-phase photovoltaic grid-connected inverter, which comprises an isolation circuit, a rectification circuit, a charging protection circuit and a DC filter circuit connected in sequence, and is connected between the charging protection circuit and the DC The CPU control board between the filter circuits, the temperature detection module connected to the CPU control board, the voltage detection module and the current detection module, and the PC host computer connected between the three-phase inverter and the CPU control board; the isolation circuit The input end of the DC filter circuit is connected to the three-phase power supply, the output end of the DC filter circuit is connected to the three-phase inverter through the fourth switch, and the three-phase inverter is also connected to the three-phase power supply through the second switch. The utility model has the advantages of low cost, strong protection function and strong practicability.

Description

A three-phase photovoltaic grid-connected inverter aging power supply

technical field

The utility model relates to the technical field of inverters, and more specifically relates to an aging power supply for a three-phase photovoltaic grid-connected inverter.

Background technique

At present, the three-phase photovoltaic grid-connected inverters on the market need to complete the aging test of the products when they are put into the market, so that the products can achieve better compatibility when used by customers. When the photovoltaic inverter products are aging, they need Turn on the aging power. Therefore, it is necessary to design an aging power supply with simple structure and stable use.

Utility model content

The purpose of the utility model is to provide an aging power supply for a three-phase photovoltaic grid-connected inverter with simple structure, stable use and reliable performance.

In order to achieve the above object, the technical scheme that the utility model adopts is as follows:

A three-phase photovoltaic grid-connected inverter aging power supply, including an isolation circuit, a rectifier circuit, a charging protection circuit and a DC filter circuit connected in sequence, a CPU control board connected between the charging protection circuit and the DC filter circuit, and a CPU control board The temperature detection module, the voltage detection module and the current detection module connected to the board, and the PC host computer connected between the three-phase inverter and the CPU control board; the input end of the isolation circuit is connected to the three-phase power supply, and the DC filter The output end of the circuit is connected to the three-phase inverter through the fourth switch, and the three-phase inverter is also connected to the three-phase power supply through the second switch.

Preferably, it also includes a first capacitor connected between the rectification circuit and the charging protection circuit.

Preferably, the isolation circuit includes a first switch and an isolation transformer, one end of the first switch is connected to the three-phase power supply, and the other end of the first switch is connected to the rectifier circuit through the isolation transformer.

Preferably, the charging protection circuit includes a third switch and a first resistor, the third switch is connected between the rectifier circuit and the DC filter circuit, and the first resistor is connected in parallel with the third switch.

Preferably, the DC filter circuit includes an inductor, a second capacitor to a fourth capacitor, a second resistor and a third resistor, the second capacitor and the third capacitor are connected in parallel with the fourth capacitor after being connected in series, and the second resistor The third resistor is connected in series with the third resistor and then connected in parallel with the fourth capacitor, and the inductor is connected between the second capacitor and the charging protection circuit.

Compared with the prior art, the utility model has the advantages of low cost, strong protection function and strong practicability.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a circuit diagram of an aging power supply of a three-phase photovoltaic grid-connected inverter described in the present invention.

Explanation of reference signs: 1. Isolation circuit, 2. Rectification circuit, 3. Charging protection circuit, 4. DC filter circuit, 5. Three-phase inverter, 6. CPU control board, 7. PC upper computer, 8. Temperature Detection module, 9, voltage detection module, 10, current detection module.

Detailed ways

The preferred embodiments of the utility model will be described in detail below in conjunction with the accompanying drawings, so that the advantages and features of the utility model can be more easily understood by those skilled in the art, so as to make a clearer definition of the protection scope of the utility model.

Referring to Figure 1, the utility model provides an aging power supply for a three-phase photovoltaic grid-connected inverter, including an isolation circuit 1, a rectifier circuit 2, a charging protection circuit 3 and a DC filter circuit 4 connected in sequence, connected to the charging protection circuit 3 and the CPU control board 6 between the DC filter circuit 4, the temperature detection module 8 connected to the CPU control board 6, the voltage detection module 9 and the current detection module 10, and the three-phase inverter 5 and the CPU control board 6 PC host computer 7 between; wherein, the input terminal of isolation circuit 1 is connected with three-phase power supply RST, the output terminal of DC filter circuit 4 is connected with three-phase inverter 5 through the fourth switch S4, and three-phase inverter 5 also It is connected to the three-phase power supply RST through the second switch S2.

The utility model also includes a first capacitor C1 connected between the rectification circuit 2 and the charging protection circuit 3 .

In the present invention, the isolation circuit 1 includes a first switch S1 and an isolation transformer T1, one end of the first switch S1 is connected to the three-phase power supply, and the other end is connected to the rectifier circuit 2 through the isolation transformer T1. The charging protection circuit includes a third switch S3 and a first resistor R1, the third switch S3 is connected between the rectifier circuit 2 and the DC filter circuit 4, and the first resistor R1 is connected in parallel with the third switch S3. The DC filter circuit 4 includes an inductor L1, a second capacitor C2 to a fourth capacitor C3, a second resistor R2, and a third resistor R3. The second capacitor C2 and the third capacitor C3 are connected in series with the fourth capacitor C4, and the second resistor R2 and the third resistor R3 are connected in parallel with the fourth capacitor C4 after being connected in series, and the inductor L1 is connected between the second capacitor C2 and the charging protection circuit 3 .

When the utility model is in use, the power grid voltage RST three-phase 380V voltage input, through the air switch S1, and then through the isolation transformer T1 for isolation; through the rectification circuit 2 (bridge rectification circuit) rectification; by the third switch S3 and the first resistor R1 forms a charging protection circuit for protection, and is controlled by the CPU control board 6; then passes through the inductor L1, capacitor C2, resistor R2, capacitor C3, resistor R3, and capacitor C4 to form a DC filter circuit 4; and supplies power to the CPU control board 6; The DC power supply is connected to the three-phase inverter 5 through the switch S4; the inverter is connected to the RST grid through the second switch S2; the three-phase inverter 5 communicates with the PC upper computer 7 through 485 communication, and the CPU control board 6 and The PC upper computer 7 communicates, detects the temperature of the aging power supply, and performs temperature protection, detects the current of each phase of the aging power supply and performs overcurrent protection, detects each voltage of the aging power supply, and performs overvoltage protection.

Although the embodiment of the utility model has been described in conjunction with the accompanying drawings, the patent owner can make various deformations or modifications within the scope of the appended claims, as long as it does not exceed the protection scope described in the claims of the utility model, All should be within the protection scope of the present utility model.

Claims (5)

1. the aging power supply of three-phase photovoltaic grid-connected inverting device, it is characterized in that: comprise the buffer circuit (1) connected successively, rectification circuit (2), charge protector (3) and DC filtering circuit (4), be connected to the 10G CPU Control Unit (6) between charge protector (3) and DC filtering circuit (4), the temperature detecting module (8) be connected with 10G CPU Control Unit (6), voltage detection module (9) and current detection module (10), and the PC host computer (7) be connected between three-phase inverter (5) and 10G CPU Control Unit (6), the input of described buffer circuit (1) connects three phase mains, the output of described DC filtering circuit (4) is connected with three-phase inverter (5) by the 4th switch (S4), and described three-phase inverter (5) is also connected with three phase mains by second switch (S2).

2. the aging power supply of three-phase photovoltaic grid-connected inverting device according to claim 1, is characterized in that: also comprise the first electric capacity (C1) be connected between rectification circuit (2) and charge protector (3).

3. the aging power supply of three-phase photovoltaic grid-connected inverting device according to claim 1, it is characterized in that: described buffer circuit (1) comprises the first switch (S1) and isolating transformer (T1), one end of described first switch (S1) is connected with three phase mains, and its other end is connected with rectification circuit (2) by isolating transformer (T1).

4. the aging power supply of three-phase photovoltaic grid-connected inverting device according to claim 1; it is characterized in that: described charge protector comprises the 3rd switch (S3) and the first resistance (R1); described 3rd switch (S3) is connected between rectification circuit (2) and DC filtering circuit (4), and described first resistance (R1) is in parallel with the 3rd switch (S3).

5. the aging power supply of three-phase photovoltaic grid-connected inverting device according to claim 1, it is characterized in that: described DC filtering circuit (4) comprises inductance (L1), second electric capacity (C2) is to the 4th electric capacity (C3), second resistance (R2) and the 3rd resistance (R3), it is in parallel with the 4th electric capacity (C4) after described second electric capacity (C2) and the 3rd electric capacity (C3) are in series, described second resistance (R2) and the 3rd resistance (R3) mutually series connection are rear in parallel with the 4th electric capacity (C4), described inductance (L1) is connected between the second electric capacity (C2) and charge protector (3).