Isolation driving power supply circuit
By designing an isolated drive power supply circuit, DC power supply and transformer generate highly adaptable DC positive and negative voltages, the problem of large volume and inconsistent output in IGBT drive power supply is solved, and a power supply circuit with low power, independent control and flexible combination is realized.
Patent Information
- Application Number
- CN202420223594.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-30
- Publication Date
- 2025-01-10
- Estimated Expiration
- 2034-01-30
AI Technical Summary
Transformers with multiple windings in existing IGBT drive power supplies result in large volumes and inconsistent output voltages. The traditional flyback transformer multi-channel output scheme is large in size and inflexible, making it impossible to achieve independent control of each channel.
Design an isolated drive power supply circuit, using DC power supply, MOS tube, capacitor, resistor, diode and transformer, convert DC power into AC power through PWM drive waves, and transmit it to the secondary side through the transformer, and generate DC positive and negative using rectifier and filter components. Voltage, adapts to different models of IGBTs and allows multiple transformers to be connected in parallel for flexible combinations.
The use of small-power transformers is achieved, with consistent output voltage and small size, and independently controlling each drive power supply, saving costs, and adapting to different models of IGBTs by adjusting the transformer turn ratio, ensuring the reliability of electrical isolation.
Smart Images
Figure CN222339266U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of circuits, in particular to an isolation driving power supply circuit. Background Art
[0002] In the hybrid energy storage inverter of the energy storage industry, for the IGBT drive power supply, the IGBT drive often uses a drive transformer to lead out multiple isolated windings as the IGBT drive power supply. Because multiple windings are used, the corresponding transformer is large in size, and the output drive voltage of each winding is inconsistent, which causes various problems, such as uneven current when multiple IGBTs are connected in parallel. In addition, most traditional drive power supplies use a flyback transformer with multiple outputs, which is large in size, inflexible, and cannot achieve independent control of each output.
[0003] Therefore, it is necessary to design an isolated drive power supply circuit to solve the problems existing in the prior art. Utility Model Content
[0004] The purpose of the utility model is to provide an isolated driving power supply circuit, which can effectively solve the above-mentioned technical problems existing in the prior art.
[0005] In order to achieve the above-mentioned purpose, an embodiment of the utility model provides an isolated driving power supply circuit, including a DC power supply, a first MOS tube, a second MOS tube, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a first resistor, a second resistor, a first diode, a second diode, a voltage regulator tube and a transformer;
[0006] The drain of the first MOS tube is connected to the positive electrode of the DC power supply, the source of the first MOS tube is connected to the drain of the second MOS tube and the connection is connected to one end of the primary side of the transformer, the source of the second MOS tube is connected to the negative electrode of the DC power supply, and the gate of the first MOS tube and the gate of the second MOS tube are respectively connected to the PWM drive wave; one end of the first capacitor and the first resistor connected in parallel is connected to the positive electrode of the DC power supply, the other end of the first capacitor and the first resistor connected in parallel is connected to one end of the second capacitor and the second resistor connected in parallel and the connection is connected to the other end of the primary side of the transformer, and the other end of the second capacitor and the second resistor connected in parallel is connected to the negative electrode of the DC power supply;
[0007] One end of the secondary side of the transformer is connected to the positive electrode of the second diode, the negative electrode of the second diode is connected to one end of the third capacitor, and the other end of the third capacitor is connected to the other end of the secondary side of the transformer; the other end of the secondary side of the transformer is also connected to one end of the fourth capacitor and one end of the fifth capacitor, the other end of the fourth capacitor is connected to the negative electrode of the Zener diode, the other end of the fifth capacitor is connected to the positive electrode of the Zener diode and the positive electrode of the first diode, and the negative electrode of the first diode is connected to one end of the secondary side of the transformer; the two ends of the third capacitor are used to connect to the first IGBT drive circuit, and the two ends of the fourth capacitor are used to connect to the second IGBT drive circuit.
[0008] As an improvement of the above solution, the isolation drive power supply circuit further includes a third resistor and a fourth resistor, the third resistor is connected in parallel with the third capacitor; the fourth resistor is connected in parallel with the fourth capacitor.
[0009] As an improvement of the above scheme, under the drive of the PWM drive wave, the first MOS transistor and the second MOS transistor convert the DC power of the DC power supply into AC power and transmit it to the secondary side through the transformer; the AC power generated by the secondary side of the transformer is converted into a DC positive voltage for use by the first IGBT drive circuit under the rectification of the second diode and the filtering of the third capacitor; the AC power generated by the secondary side of the transformer is converted into a DC negative voltage for use by the second IGBT drive circuit under the rectification of the first diode and the voltage regulator tube and the filtering of the fourth capacitor and the fifth capacitor.
[0010] As an improvement of the above solution, the magnitude of the output DC positive voltage and DC negative voltage can be adjusted by adjusting the turns ratio of the primary and secondary coils of the transformer, thereby adapting to driving IGBTs of different models.
[0011] As an improvement of the above scheme, the transformer includes two, and the third capacitor, the fourth capacitor, the fifth capacitor, the first diode, the second diode and the Zener diode each include two; the two ends of the primary sides of the two transformers are connected in parallel, and the circuit structures connected to the secondary sides of the two transformers are the same.
[0012] As an improvement of the above scheme, the transformer includes at least three, and the third capacitor, the fourth capacitor, the fifth capacitor, the first diode, the second diode and the Zener diode each include at least three; the two ends of the primary sides of at least three of the transformers are connected in parallel, and the circuit structures connected to the secondary sides of at least three of the transformers are the same.
[0013] Compared with the prior art, the utility model embodiment provides an isolated driving power supply circuit. Under the drive of the PWM driving wave, the first MOS tube and the second MOS tube convert the DC power of the DC power supply into AC power and transmit it to the secondary side through the transformer; the AC power generated by the secondary side of the transformer is converted into a DC positive voltage for use by the first IGBT driving circuit under the rectification of the second diode and the filtering of the third capacitor; the AC power generated by the secondary side of the transformer is converted into a DC negative voltage for use by the second IGBT driving circuit under the rectification of the first diode and the voltage regulator tube and the filtering of the fourth capacitor and the fifth capacitor. By implementing the isolated driving power supply circuit of the utility model, the following technical effects can be brought about:
[0014] (1) Solve the problem by designing a small power transformer: The input end of each IGBT drive power supply is the same voltage source, and the small power transformer has the same turn ratio, so the output voltage must be the same. The small power transformer is small in size, so the entire drive power supply is small in size.
[0015] (2) Each drive power supply is independently controlled and the output voltage is stable.
[0016] (3) Multiple drive power supplies can use the same DC power supply input voltage.
[0017] (4) One coil winding can output positive voltage +U1 and negative voltage -U2 simultaneously, which not only enables the IGBT to be turned on reliably, but also enables the IGBT to be turned off reliably.
[0018] (5) Multiple transformers can be connected in parallel at the same time (for example, multiple transformers can be connected in parallel at both ends of the primary side). Each transformer is equivalent to a driving power supply. They can be flexibly combined (transformers in parallel) according to actual needs, which can also save costs.
[0019] (6) The output drive voltage can be adjusted by changing the main-to-auxiliary turns ratio of the transformer to adapt to driving different types of IGBTs. It has strong adaptability, and the electrical isolation of the transformer is strong and reliable. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the implementation mode will be briefly introduced below. Obviously, the drawings described below are only some implementation modes of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0021] Figure 1 It is a circuit structure diagram of an isolated drive power supply circuit provided by an embodiment of the utility model.
[0022] Figure 2 It is a circuit structure diagram of another isolated driving power supply circuit provided by an embodiment of the utility model.
[0023] Figure 3 This is a circuit structure diagram of another isolated drive power supply circuit provided by an embodiment of the utility model. DETAILED DESCRIPTION
[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0025] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.
[0026] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0027] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or can communicate with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0028] refer to Figure 1The embodiment of the utility model provides an isolated driving power supply circuit, including a DC power supply S, a first MOS tube Q1, a second MOS tube Q2, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a first resistor R1, a second resistor R2, a first diode D1, a second diode D2, a voltage regulator ZD1 and a transformer T1.
[0029] Wherein, the drain electrode D of the first MOS tube Q1 is connected to the positive electrode of the DC power supply S1, the source electrode S of the first MOS tube Q1 is connected to the drain electrode D of the second MOS tube Q2 and the connection point is connected to one end (pin 1) of the primary side of the transformer T1, the source electrode S of the second MOS tube Q2 is connected to the negative electrode of the DC power supply S1, and the gate electrode G of the first MOS tube Q1 and the gate electrode G of the second MOS tube Q2 are respectively connected to the PWM drive wave; the first capacitor C1 and the first resistor R1 are connected in parallel (pin 1 of the first capacitor C1 and pin 1 of the first resistor R1 are connected together, and pin 2 of the first capacitor C1 and pin 2 of the first resistor R1 are connected together) and one end (pin 1 of the first capacitor C1 and pin 2 of the first resistor R1) of the first resistor C1 is connected to the first resistor R1. The first capacitor C1 and the first resistor R1 are connected in parallel with each other (pin 2 of the first capacitor C1 and pin 2 of the first resistor R1), and one end (pin 1 of the second capacitor C2 and pin 1 of the second resistor R2) after the second capacitor C2 and the second resistor R2 are connected in parallel (pin 1 of the second capacitor C2 and pin 1 of the second resistor R2 are connected together, and pin 2 of the second capacitor C2 and pin 2 of the second resistor R2 are connected together), and the connection is connected to the other end (pin 2) of the primary side of the transformer T1, and the other end (pin 2 of the second capacitor C2 and pin 2 of the second resistor R2) after the second capacitor C2 and the second resistor R2 are connected in parallel is connected to the negative electrode of the DC power supply S1.
[0030] One end (pin 3) of the secondary side of the transformer T1 is connected to the positive electrode of the second diode D2, the negative electrode of the second diode D2 is connected to one end (pin 1) of the third capacitor C3, and the other end (pin 2) of the third capacitor C3 is connected to the other end (pin 4) of the secondary side of the transformer T1. The other end (pin 2) of the secondary side of the transformer T1 is also connected to one end (pin 1) of the fourth capacitor C4 and one end (pin 1) of the fifth capacitor C5, the other end (pin 2) of the fourth capacitor C4 is connected to the negative electrode of the voltage regulator tube ZD1, the other end (pin 2) of the fifth capacitor C5 is simultaneously connected to the positive electrode of the voltage regulator tube ZD1 and the positive electrode of the first diode D1, and the negative electrode of the first diode D1 is connected to one end (pin 3) of the secondary side of the transformer T1. Among them, the two ends (pin 1 and pin 2) of the third capacitor C3 are used to connect the first IGBT drive circuit (not shown in the figure), and the two ends (pin 1 and pin 2) of the fourth capacitor C4 are used to connect the second IGBT drive circuit (not shown in the figure).
[0031] Further, such as Figure 1 As shown, the isolation drive power supply circuit provided in the embodiment further includes a third resistor R3 and a fourth resistor R4, wherein the third resistor R3 is connected in parallel with the third capacitor C3 (pin 1 of the third capacitor C3 is connected to pin 1 of the third resistor R3, and pin 2 of the third capacitor C3 is connected to pin 2 of the third resistor R3); the fourth resistor R4 is connected in parallel with the fourth capacitor C4 (pin 1 of the fourth capacitor C4 is connected to pin 1 of the fourth resistor R4, and pin 2 of the fourth capacitor C4 is connected to pin 2 of the fourth resistor R4). It can be understood that the third resistor R3 and the fourth resistor R4 act as dummy loads and discharge the third capacitor C3 and the fourth capacitor C4 respectively.
[0032] Next, continue to refer to Figure 1 , the working principle and process of the isolated driving power supply circuit provided in this embodiment are described in detail:
[0033] Under the drive of the PWM drive wave, the first MOS transistor Q1 and the second MOS transistor Q2 convert the DC power of the DC power supply S1 into AC power and transmit it to the secondary side through the transformer T1 (the transformer T1 plays the role of isolation and voltage transformation); the AC power generated by the secondary side of the transformer T1 is converted into a DC positive voltage +U1 (+U1 is a positive voltage relative to the 4th pin of the secondary side of the transformer T1) under the rectification of the second diode D2 and the filtering of the third capacitor C3, so as to be used by the first IGBT drive circuit. The AC power generated by the secondary side of the transformer T1 is converted into a DC negative voltage -U2 (-U2 is a negative voltage relative to the 4th pin of the secondary side of the transformer T1) under the rectification of the first diode D1 and the voltage regulator ZD1 and the filtering of the fourth capacitor C4 and the fifth capacitor C5, so as to be used by the second IGBT drive circuit. It can be understood that by adjusting the turns ratio of the main and secondary coils of the transformer T1, the magnitude of the output DC positive voltage and DC negative voltage can be adjusted to adapt to driving IGBTs of different models.
[0034] Furthermore, the isolated drive power supply circuit provided by the utility model can simultaneously connect multiple transformers in parallel (for example, multiple transformers can be connected in parallel at both ends of the primary side of transformer T1), and each transformer is equivalent to a drive power supply. They can be flexibly combined (transformers in parallel) according to actual needs, and can also save costs.
[0035] For example, Figure 2As shown, the transformer T1 includes two, and the third resistor R3, the fourth resistor R4, the fourth capacitor C4, the third capacitor C3, the fourth capacitor C4, the fifth capacitor C5, the first diode D1, the second diode D2 and the voltage regulator ZD1 include two corresponding ones. Among them, the two ends of the primary sides of the two transformers T1 are connected in parallel, and the circuit structures connected to the secondary sides of the two transformers T1 are the same.
[0036] For example, Figure 3 As shown, the transformer T1 includes at least three (three are shown in the figure, but it can be understood that it can also be 4 or more), and the third resistor R3, the fourth resistor R4, the fourth capacitor C4, the third capacitor C3, the fourth capacitor C4, the fifth capacitor C5, the first diode D1, the second diode D2 and the voltage regulator ZD1 include at least three corresponding ones. Among them, the two ends of the primary sides of at least three transformers T1 are connected in parallel, and the circuit structures connected to the secondary sides of at least three transformers T1 are the same.
[0037] In summary, the utility model provides an isolated driving power supply circuit. Under the drive of the PWM driving wave, the first MOS tube Q1 and the second MOS tube Q2 convert the DC power of the DC power supply S1 into AC power and transmit it to the secondary side through the transformer T1. The AC power generated by the secondary side of the transformer T1 is converted into a DC positive voltage +U1 for use by the first IGBT driving circuit under the rectification of the second diode D2 and the filtering of the third capacitor C3. The AC power generated by the secondary side of the transformer T1 is converted into a DC negative voltage -U2 for use by the second IGBT driving circuit under the rectification of the first diode D1 and the voltage regulator ZD1 and the filtering of the fourth capacitor C4 and the fifth capacitor C5. By implementing the isolated driving power supply circuit of the utility model, the following technical effects can be brought about: (1) By designing a small power transformer, the input end of each IGBT driving power supply is the same voltage source, and the small power transformer has the same turn ratio, so the output voltage must be consistent. The small power transformer is small in size, so the entire driving power supply is small in size. (2) Each driving power supply is independently controlled and the output voltage is stable. (3) Multiple drive power supplies can use the same DC power supply input voltage. (4) A coil winding can simultaneously output positive voltage +U1 and negative voltage -U2, which not only enables the IGBT to be turned on reliably, but also enables the IGBT to be turned off reliably. (5) Multiple transformers can be connected in parallel at the same time (for example, multiple transformers can be connected in parallel at both ends of the primary side of the transformer). Each transformer is equivalent to a drive power supply, which can be flexibly combined (transformers in parallel) according to actual needs, and can also save costs. (6) The output drive voltage can be adjusted by changing the main and secondary turns ratio of the transformer to adapt to driving different models of IGBTs. It has strong adaptability, and the electrical isolation of the transformer is strong and reliable.
[0038] The above disclosures are only some preferred embodiments of the present invention, which certainly cannot be used to limit the scope of the present invention. A person skilled in the art can understand that all or part of the processes of the above embodiments and equivalent changes made according to the claims of the present invention still fall within the scope of the present invention.
Claims
1. An isolated driving power supply circuit, characterized in that: It includes a DC power supply, a first MOS tube, a second MOS tube, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a first resistor, a second resistor, a first diode, a second diode, a voltage regulator tube and a transformer; The drain of the first MOS tube is connected to the positive electrode of the DC power supply, the source of the first MOS tube is connected to the drain of the second MOS tube and the connection is connected to one end of the primary side of the transformer, the source of the second MOS tube is connected to the negative electrode of the DC power supply, and the gate of the first MOS tube and the gate of the second MOS tube are respectively connected to the PWM drive wave; one end of the first capacitor and the first resistor connected in parallel is connected to the positive electrode of the DC power supply, the other end of the first capacitor and the first resistor connected in parallel is connected to one end of the second capacitor and the second resistor connected in parallel and the connection is connected to the other end of the primary side of the transformer, and the other end of the second capacitor and the second resistor connected in parallel is connected to the negative electrode of the DC power supply; One end of the secondary side of the transformer is connected to the positive electrode of the second diode, the negative electrode of the second diode is connected to one end of the third capacitor, and the other end of the third capacitor is connected to the other end of the secondary side of the transformer; the other end of the secondary side of the transformer is also connected to one end of the fourth capacitor and one end of the fifth capacitor, the other end of the fourth capacitor is connected to the negative electrode of the Zener diode, the other end of the fifth capacitor is connected to the positive electrode of the Zener diode and the positive electrode of the first diode, and the negative electrode of the first diode is connected to one end of the secondary side of the transformer; the two ends of the third capacitor are used to connect to the first IGBT drive circuit, and the two ends of the fourth capacitor are used to connect to the second IGBT drive circuit.
2. The isolated driving power supply circuit according to claim 1, characterized in that: It also includes a third resistor and a fourth resistor, wherein the third resistor is connected in parallel with the third capacitor; and the fourth resistor is connected in parallel with the fourth capacitor.
3. The isolated driving power supply circuit according to claim 1, characterized in that: Driven by the PWM drive wave, the first MOS transistor and the second MOS transistor convert the DC power of the DC power supply into AC power and transmit it to the secondary side through the transformer; the AC power generated by the secondary side of the transformer is converted into a DC positive voltage for use by the first IGBT drive circuit under the rectification of the second diode and the filtering of the third capacitor; the AC power generated by the secondary side of the transformer is converted into a DC negative voltage for use by the second IGBT drive circuit under the rectification of the first diode and the voltage regulator and the filtering of the fourth capacitor and the fifth capacitor.
4. The isolated driving power supply circuit according to claim 1, characterized in that: The magnitude of the output DC positive voltage and DC negative voltage can be adjusted by adjusting the turns ratio of the primary and secondary coils of the transformer, thereby adapting to driving IGBTs of different models.
5. The isolated driving power supply circuit according to claim 1, characterized in that: The transformers include two, and the third capacitor, the fourth capacitor, the fifth capacitor, the first diode, the second diode and the Zener diode each include two; the two ends of the primary sides of the two transformers are connected in parallel, and the circuit structures connected to the secondary sides of the two transformers are the same.
6. The isolated driving power supply circuit according to claim 1, characterized in that: The transformer includes at least three, and the third capacitor, the fourth capacitor, the fifth capacitor, the first diode, the second diode and the Zener diode each include at least three; the two ends of the primary sides of at least three of the transformers are connected in parallel, and the circuit structures connected to the secondary sides of at least three of the transformers are the same.