Power circuit of combined multi-winding power transformer

Abstract

The utility model relates to a power circuit of a combined multi-winding power transformer. The power circuit comprises a power output unit, a secondary coil and two or more secondary coils. The power supply output unit is used for forming a flyback power supply, the primary coil is connected to the flyback power supply, and power supply voltage output meeting requirements of different sizes is formed on the secondary coil. The secondary coils and the primary coil form the same transformer, and the turn ratio of the secondary coils can be selected, so that only one transformer is needed, and the overall cost, the overall size and the overall wiring complexity can be reduced.

Description

Technical Field

[0001] This application relates to the field of photovoltaic inverter technology, and in particular to a power supply circuit for a combined multi-winding power transformer. Background Technology

[0002] A photovoltaic inverter (or solar inverter) is an inverter that converts the variable DC voltage generated by photovoltaic (PV) solar panels into AC power at the mains frequency. This AC power can be fed back into commercial power transmission systems or supplied to off-grid power grids.

[0003] In photovoltaic inverters, the design of the flyback power supply circuit is a crucial part of the overall design. Current solutions involve using a power supply IC to drive and turn on a MOSFET, forming a flyback power supply that outputs a relatively high-frequency voltage. This high voltage is then gradually converted to lower voltages through multiple transformer stages. This power supply circuit requires multiple transformers, resulting in high costs and a complex PCB layout and large size. Utility Model Content

[0004] To address the issue that high-frequency power supplies in photovoltaic inverters require multiple transformers to progressively convert higher voltages to lower voltages, this disclosure provides a combined multi-winding power transformer circuit. This circuit requires multiple transformers, resulting in high costs and complex PCB traces and large size.

[0005] This disclosure provides a combined multi-winding power transformer power supply circuit, including:

[0006] Power output unit, used to generate flyback power supply;

[0007] The primary coil is used to connect to the flyback power supply;

[0008] Two or more secondary coils; wherein each of the secondary coils forms the same transformer with the primary coil, and the turns ratio of each secondary coil can be selected.

[0009] The combined multi-winding power transformer power supply circuit of this disclosure includes a power output unit, a secondary coil, and two or more secondary coils. The power output unit is used to form a flyback power supply, with the primary coil connected to the flyback power supply, forming a power voltage output on the secondary coil to meet different size requirements. Since each secondary coil forms the same transformer with the primary coil, and the turns ratio of each secondary coil can be selected, only one transformer is needed, which helps to reduce the overall cost, size, and wiring complexity.

[0010] As one optional embodiment, the power output unit includes:

[0011] The power supply unit is used to connect to DC voltage and generate power output;

[0012] The driving unit is used to generate a driving power output based on the power output.

[0013] As one optional embodiment, the primary coil includes:

[0014] The first winding is used to connect to the power output;

[0015] The second winding is used to connect to the drive power supply output.

[0016] As one optional embodiment, the power supply unit includes a first resistor, a second resistor, and a diode;

[0017] The negative terminal of the diode is connected to one pole of the DC voltage through the second resistor and the first resistor;

[0018] The positive terminal of the diode is connected to the opposite terminal of the first winding, and the same terminal of the first winding is connected to the other terminal of the DC voltage.

[0019] As one optional embodiment, the drive unit includes:

[0020] The driver IC has its VCC terminal connected to one pole of the DC voltage through the first resistor, and its GND terminal connected to the other pole of the DC voltage.

[0021] The MOS transistor has its gate connected to the output terminal of the driver IC, its drain connected to the other terminal of the DC voltage through a third resistor, its source connected to the opposite terminal of the second winding, and its same terminal connected to one terminal of the DC voltage.

[0022] As one optional embodiment, it also includes a component connected in parallel to the VCC terminal and the GND terminal:

[0023] Zener diode, first capacitor, and second capacitor;

[0024] The negative terminal of the Zener diode is connected to the VCC terminal, and the positive terminal of the Zener diode is connected to the GND terminal.

[0025] As one alternative embodiment, a secondary coil is included that outputs a first set voltage.

[0026] As one alternative embodiment, it includes two secondary coils that output a second set voltage.

[0027] As one of the alternative embodiments, a secondary coil with an output of 24V, 15V, 7V, or 5V is included.

[0028] As one of the alternative embodiments, it includes two secondary coils with an output of 9V. Attached Figure Description

[0029] Figure 1 A structural diagram of a power circuit module of a combined multi-winding power transformer according to a disclosed embodiment;

[0030] Figure 2 A structural diagram of a power circuit module of a combined multi-winding power transformer according to a preferred embodiment;

[0031] Figure 3 This is a power circuit diagram of a combined multi-winding power transformer according to a preferred embodiment. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0033] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as “comprising” or “including” mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as “connected” or “linked” are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as “upper,” “lower,” “left,” and “right” are used only to indicate relative positional relationships, and these relative positional relationships may change accordingly when the absolute position of the described objects changes.

[0034] To keep the following description of the embodiments of this disclosure clear and concise, detailed descriptions of some known functions and components have been omitted.

[0035] This disclosure provides a power supply circuit for a combined multi-winding power transformer.

[0036] Figure 1This is a structural diagram of a power circuit module of a combined multi-winding power transformer according to a disclosed embodiment, such as... Figure 1 As shown, a power supply circuit for a combined multi-winding power transformer according to a disclosed embodiment includes:

[0037] The power output unit 100 is used to form a flyback power supply;

[0038] The primary coil LL is used to connect to the flyback power supply;

[0039] Two or more secondary coils LR; wherein each of the secondary coils LL and the primary coil LR form the same transformer, and the turns ratio of each secondary coil LR can be selected.

[0040] like Figure 1 As shown, the flyback power supply formed by the power output unit generates a voltage output on the primary coil LL side, and the secondary coil LR converts this voltage output into different types of voltage outputs according to the turns ratio.

[0041] Based on the characteristics of flyback power supplies, preferably... Figure 2 This is a structural diagram of a power circuit module of a combined multi-winding power transformer according to a preferred embodiment, as shown below. Figure 2 As shown, the power output unit 100 includes:

[0042] Power supply unit 200 is used to connect to DC voltage to form power supply output;

[0043] The drive unit 201 is used to generate a drive power output based on the power output.

[0044] The first winding L1 is used to connect to the power output;

[0045] The second winding L2 is used to connect to the drive power supply output.

[0046] like Figure 2 As shown, on the primary coil LL side of the transformer, there is a first winding L1 and a second winding L2, which form a voltage output based on the outputs of the power supply unit 200 and the drive unit 201. Specifically, the power supply unit 200 forms a DC power supply output based on the DC voltage, and the drive unit 201 operates based on the power supply output to form a drive power supply output.

[0047] As one of the preferred embodiments, Figure 3 A power supply circuit diagram of a combined multi-winding power transformer according to a preferred embodiment is shown below. Figure 3 As shown, the power supply unit includes a first resistor R1, a second resistor R2, and a diode D3;

[0048] The negative terminal of the diode D3 is connected to one terminal of the DC voltage INPUT through the second resistor R2 and the first resistor R1.

[0049] The positive terminal of diode D3 is connected to the opposite terminal of the first winding, and the same terminal of the first winding is connected to the other terminal of the DC voltage INPUT.

[0050] The drive unit includes:

[0051] The driver IC has its VCC terminal connected to one pole of the DC voltage through the first resistor R1, and its GND terminal connected to the other pole of the DC voltage INPUT.

[0052] The gate of MOSFET Q1 is connected to the output terminal of the driver IC, the drain is connected to the other terminal of the DC voltage INPUT through the third resistor R3, the source is connected to the opposite terminal of the second winding, and the same terminal of the second winding is connected to one terminal of the DC voltage INPUT.

[0053] As one of the preferred embodiments, such as Figure 3 As shown, a preferred embodiment of the combined multi-winding power transformer power supply circuit further includes a component connected in parallel to the VCC terminal and the GND terminal:

[0054] Zener diode D1, first capacitor C2C, and second capacitor C3;

[0055] The negative terminal of the Zener diode D1 is connected to the VCC terminal, and the positive terminal of the Zener diode D1 is connected to the GND terminal.

[0056] like Figure 3 As shown, the DC voltage INPUT can input a DC voltage of 180-1000V. The voltage is divided by resistor R1 and then regulated by diode D1 to form the power supply VCC of the driver IC. This enables the driver IC to drive the MOSFET Q1 to work and output a 24V high-frequency power supply. Then, after passing through the transformer turns ratio, other secondary power supply voltages are output.

[0057] As one embodiment, it includes a secondary coil that outputs a first set voltage and two secondary coils that output a second set voltage.

[0058] like Figure 3 As shown, it includes a secondary coil with an output of 24V, 15V, 7V or 5V and two secondary coils with an output of 9V.

[0059] The combined multi-winding power transformer power supply circuit of any embodiment of this disclosure includes a power output unit, a secondary coil, and two or more secondary coils. The power output unit is used to form a flyback power supply, with the primary coil connected to the flyback power supply, forming a power voltage output on the secondary coil to meet different size requirements. Since each secondary coil forms the same transformer with the primary coil, and the turns ratio of each secondary coil can be selected, only one transformer is needed, which helps to reduce the overall cost, size, and wiring complexity.

[0060] (1) The accompanying drawings of the embodiments of this disclosure only involve the structures involved in the embodiments of this disclosure. Other structures can be referred to the general design.

[0061] (2) For clarity, the thickness and dimensions of layers or structures are enlarged in the drawings used to describe embodiments of the present invention. It will be understood that when an element such as a layer, film, region or substrate is referred to as being “above” or “below” another element, the element may be “directly” located “above” or “below” the other element, or there may be intermediate elements present.

[0062] (3) Where there is no conflict, the embodiments and features in the embodiments of this disclosure can be combined with each other to obtain new embodiments. The above are only specific embodiments of this disclosure, but the protection scope of this disclosure is not limited thereto, and the protection scope of this disclosure should be determined by the protection scope of the claims.

[0063] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0064] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A power supply circuit for a combined multi-winding power transformer, characterized in that, include: Power output unit, used to generate flyback power supply; The primary coil is used to connect to the flyback power supply; Two or more secondary coils; wherein each of the secondary coils forms the same transformer with the primary coil, and the turns ratio of each secondary coil can be selected; The power output unit includes: The power supply unit is used to connect to DC voltage and generate power output; A drive unit is used to generate a drive power supply output based on the power supply output; The primary coil includes: The first winding is used to connect to the power output; The second winding is used to connect to the drive power supply output; The power supply unit includes a first resistor, a second resistor, and a diode; The negative terminal of the diode is connected to one pole of the DC voltage through the second resistor and the first resistor; The positive terminal of the diode is connected to the opposite terminal of the first winding, and the same terminal of the first winding is connected to the other terminal of the DC voltage. The driving unit includes: The driver IC has its VCC terminal connected to one pole of the DC voltage through the first resistor, and its GND terminal connected to the other pole of the DC voltage. The MOSFET has its gate connected to the output terminal of the driver IC, its drain connected to the other terminal of the DC voltage through a third resistor, its source connected to the opposite terminal of the second winding, and its same terminal connected to one terminal of the DC voltage. It also includes the following connected in parallel to the VCC terminal and the GND terminal: Zener diode, first capacitor, and second capacitor; The negative terminal of the Zener diode is connected to the VCC terminal, and the positive terminal of the Zener diode is connected to the GND terminal.

2. The power supply circuit of the combined multi-winding power transformer according to claim 1, characterized in that, It includes a secondary coil that outputs a first set voltage.

3. The power supply circuit of the combined multi-winding power transformer according to claim 1, characterized in that, It includes two secondary coils that output a second set voltage.

4. The power supply circuit of the combined multi-winding power transformer according to claim 1, characterized in that, Includes a secondary coil with an output of 24V, 15V, 7V, or 5V.

5. The power supply circuit of the combined multi-winding power transformer according to claim 3, characterized in that, It includes two secondary coils with an output of 9V.

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