IGBT (Insulated Gate Bipolar Translator) driving isolation power supply circuit

Abstract

The utility model discloses an IGBT driving isolation power supply circuit, the IGBT driving isolation power supply circuit comprises a power supply input end and a power supply output end, a push-pull circuit, a transformer and a boost circuit are arranged between the power supply input end and the power supply output end, an input end of the push-pull circuit is electrically connected with the power supply input end, and an output end of the push-pull circuit is electrically connected with the boost circuit. The output end of the push-pull circuit is electrically connected with the input side of the transformer, the output side of the transformer is electrically connected with the input end of the booster circuit, and the output end of the booster circuit is electrically connected with the power output end. According to the utility model, while IGBT driving voltage output is realized, material cost is reduced, and the IGBT driving circuit is especially suitable for cost-sensitive application scenarios such as microcars and the like.

Description

Technical Field

[0001] This utility model belongs to the field of power electronics technology, specifically relating to an IGBT drive isolation power supply circuit. Background Technology

[0002] In the field of modern power electronics, IGBTs, with their significant advantages such as high voltage, high current, and low conduction loss, are widely used in many key areas such as industrial frequency conversion, new energy power generation, electric vehicles, and smart grids. The reliable operation of IGBTs relies on a high-performance drive isolation power supply circuit. This circuit provides a stable and suitable drive signal to the IGBT gate while simultaneously achieving electrical isolation between the drive circuit and the main power circuit, ensuring the safety and stability of the system.

[0003] Currently, the most common IGBT driver isolation power supply circuits on the market use transformer isolation solutions. While this solution achieves electrical isolation and driving functions, it has significant drawbacks. Firstly, the traditional IGBT isolation driver power supply circuit has a complex structure and requires high-cost materials, which not only increases product development and production costs but also weakens the product's price competitiveness in the market. Secondly, traditional transformers are large and heavy, making it difficult to meet the miniaturization and lightweight design requirements of the entire driver isolation power supply circuit. This severely limits its use in applications with stringent space and weight constraints, such as electric vehicles and aerospace.

[0004] In conclusion, developing a low-cost IGBT driver isolation power supply circuit has significant practical implications and market value. This is crucial for promoting the widespread application of IGBTs in more fields, improving the overall performance of power electronic systems, and reducing costs. Utility Model Content

[0005] The purpose of this invention is to overcome at least one defect in the prior art and to provide an IGBT drive isolated power supply circuit.

[0006] The technical solution of this utility model is implemented as follows: This utility model discloses an IGBT driver isolation power supply circuit, including a power input terminal and a power output terminal. A push-pull circuit, a transformer and a boost circuit are provided between the power input terminal and the power output terminal. The input terminal of the push-pull circuit is electrically connected to the power input terminal, the output terminal of the push-pull circuit is electrically connected to the input side of the transformer, the output side of the transformer is electrically connected to the input terminal of the boost circuit, and the output terminal of the boost circuit is electrically connected to the power output terminal.

[0007] Furthermore, the push-pull circuit employs a complementary MOSFET structure.

[0008] Furthermore, the push-pull circuit employs a push-pull driver chip for providing alternating positive and negative voltages. The push-pull driver chip has at least an EN pin, a VCC pin, a GND pin, a high-side output pin D1, and a low-side output pin D2. The GND pin of the push-pull driver chip is grounded. The EN pin of the push-pull driver chip is directly or electrically connected to the power input terminal via resistor R1. The VCC pin of the push-pull driver chip is electrically connected to the power input terminal and the center tap of the primary winding of the transformer. The high-side output pin D1 of the push-pull driver chip is electrically connected to the first end of the primary winding of the transformer, and the low-side output pin D2 of the push-pull driver chip is electrically connected to the second end of the primary winding of the transformer.

[0009] Furthermore, the boost circuit employs a voltage multiplier boost circuit.

[0010] Furthermore, the voltage multiplier circuit includes several capacitors and several diodes. The positive terminal of diode D1 is electrically connected to the negative output terminal of the power supply, one end of capacitor C7, and one end of capacitor C9. The other end of capacitor C7 is electrically connected to the other end of capacitor C9, one end of capacitor C8, one end of capacitor C10, and one end of the secondary winding of the transformer. The negative terminal of diode D1 is electrically connected to the other end of the secondary winding and the positive terminal of diode D2. The negative terminal of diode D2 is electrically connected to the other end of capacitor C8, the other end of capacitor C10, and the positive output terminal of the power supply.

[0011] Furthermore, the IGBT drive isolation power supply circuit of this utility model also includes a Zener diode D3, the positive terminal of which is electrically connected to the negative output terminal of the power supply, and the negative terminal of which is electrically connected to the positive output terminal of the power supply.

[0012] Furthermore, the IGBT drive isolation power supply circuit of this utility model also includes capacitor C11 and / or capacitor C12. One end of capacitor C11 is electrically connected to the negative output terminal of the power supply, and the other end of capacitor C11 is electrically connected to the positive output terminal of the power supply. One end of capacitor C12 is electrically connected to the negative output terminal of the power supply, and the other end of capacitor C12 is electrically connected to the positive output terminal of the power supply.

[0013] Furthermore, an input filter circuit and / or a voltage regulator circuit are provided between the input terminal and the power input terminal of the push-pull circuit.

[0014] Furthermore, the input filtering circuit employs an EMI filtering circuit.

[0015] Furthermore, the voltage regulator circuit employs an LDO module.

[0016] This utility model has at least the following beneficial effects:

[0017] This invention provides a low-cost IGBT driver isolation power supply circuit. The circuit includes a push-pull circuit, a transformer, and a boost circuit between the power input and output terminals. The push-pull circuit provides alternating positive and negative voltages to the transformer. The transformer isolates and protects the low-voltage and high-voltage power supply systems. The boost circuit doubles the transformer's output voltage while simultaneously rectifying it. Compared to other driving solutions, this design optimizes the combination of discrete components, eliminating the need for dedicated isolation devices and driver ICs. This achieves IGBT drive voltage output while reducing material costs, making it particularly suitable for cost-sensitive applications such as microcars.

[0018] This solution successfully resolves the technical contradiction of balancing cost, size, and isolation performance of IGBT driver power supplies, providing an innovative solution for the cost reduction of electric control systems in new energy vehicles. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic block diagram of an IGBT driver isolation power supply circuit disclosed in one embodiment of the present invention;

[0021] Figure 2 This is a circuit diagram of an IGBT driver isolation power supply circuit disclosed in one embodiment of the present invention. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0023] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0024] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of this utility model, unless otherwise stated, "a plurality of" or "several" means two or more.

[0025] See Figure 1 and Figure 2 This utility model provides an IGBT driver isolation power supply circuit, including a power input terminal and a power output terminal. A push-pull circuit, a transformer, and a boost circuit are provided between the power input terminal and the power output terminal. The input terminal of the push-pull circuit is electrically connected to the power input terminal, the output terminal of the push-pull circuit is electrically connected to the input side of the transformer, the output side of the transformer is electrically connected to the input terminal of the boost circuit, and the output terminal of the boost circuit is electrically connected to the power output terminal.

[0026] The push-pull circuit efficiently boosts the input voltage to the required level. During the boost process, components such as transformers effectively block direct electrical connections between different potentials, achieving electrical isolation. After the push-pull circuit completes the boost and isolation, a boost circuit is placed at the rear. This boost circuit utilizes a combination of basic electronic components such as capacitors and diodes, based on the principles of charge storage and transfer, to multiply the voltage output from the push-pull circuit. It offers significant advantages such as high efficiency in achieving the target voltage, simple structure, and low cost.

[0027] In some embodiments, the power input terminal is electrically connected to a power supply, which powers the power circuit. The power supply is a 12V power supply. The power input terminal is equipped with a power interface J1 for connecting an external power supply.

[0028] Furthermore, the push-pull circuit employs a complementary MOSFET structure.

[0029] Furthermore, the push-pull circuit employs a push-pull driver chip for providing alternating positive and negative voltages to the transformer. The push-pull driver chip has at least an EN pin, a VCC pin, a GND pin, a high-side output pin D1, and a low-side output pin D2. The GND pin of the push-pull driver chip is grounded. The EN pin of the push-pull driver chip is directly or electrically connected to the power input terminal via resistor R1. The VCC pin of the push-pull driver chip is electrically connected to the power input terminal and the center tap of the primary winding of the transformer. The high-side output pin D1 of the push-pull driver chip is electrically connected to the first end of the primary winding of the transformer, and the low-side output pin D2 of the push-pull driver chip is electrically connected to the second end of the primary winding of the transformer.

[0030] The push-pull driver chip in this embodiment provides the high-frequency transformer with alternating positive and negative 5V voltages.

[0031] In some embodiments, the push-pull driver chip also has a CLK pin, which is grounded.

[0032] The transformer is used to provide electrical isolation while simultaneously stepping up the voltage. In some embodiments, the transformer is a high-frequency transformer. The transformer in this embodiment transforms the 5V voltage on the low-voltage side to 7.5V, while simultaneously achieving voltage isolation between the low-voltage and high-voltage sides.

[0033] Furthermore, the boost circuit employs a voltage multiplier circuit. The voltage multiplier circuit is used to double the output voltage of the transformer while simultaneously performing rectification. In this embodiment, the voltage multiplier circuit is used to double the 7.5V output from the transformer, outputting a 15V voltage.

[0034] Preferably, the voltage multiplier circuit specifically includes devices such as fast recovery diodes, capacitors, and Zener diodes to rectify and multiply the voltage of the transformer, outputting a voltage of 15V.

[0035] Furthermore, the voltage multiplier circuit includes several capacitors and several diodes. The positive terminal of diode D1 is electrically connected to the negative output terminal of the power supply, one end of capacitor C7, and one end of capacitor C9. The other end of capacitor C7 is electrically connected to the other end of capacitor C9, one end of capacitor C8, one end of capacitor C10, and one end of the secondary winding of the transformer. The negative terminal of diode D1 is electrically connected to the other end of the secondary winding and the positive terminal of diode D2. The negative terminal of diode D2 is electrically connected to the other end of capacitor C8, the other end of capacitor C10, and the positive output terminal of the power supply.

[0036] Furthermore, the IGBT drive isolation power supply circuit of this utility model also includes a Zener diode D3, the positive terminal of which is electrically connected to the negative output terminal of the power supply, and the negative terminal of which is electrically connected to the positive output terminal of the power supply.

[0037] Furthermore, the IGBT drive isolation power supply circuit of this utility model also includes an energy storage capacitor C11 and / or an energy storage capacitor C12. One end of the energy storage capacitor C11 is electrically connected to the negative output terminal of the power supply, and the other end of the energy storage capacitor C11 is electrically connected to the positive output terminal of the power supply. One end of the energy storage capacitor C12 is electrically connected to the negative output terminal of the power supply, and the other end of the energy storage capacitor C12 is electrically connected to the positive output terminal of the power supply.

[0038] Furthermore, an input filter circuit and / or a voltage regulator circuit are provided between the input terminal and the power input terminal of the push-pull circuit.

[0039] In this embodiment, the push-pull circuit has an input filter circuit and a voltage regulator circuit between its input terminal and the power input terminal. The input terminal of the input filter circuit is electrically connected to the power input terminal, the output terminal of the input filter circuit is electrically connected to the input terminal of the voltage regulator circuit, and the output terminal of the voltage regulator circuit is electrically connected to the input terminal of the push-pull circuit.

[0040] In this embodiment, the EN pin of the push-pull driver chip is electrically connected directly or via resistor R1 to the output of the voltage regulator circuit. The VCC pin of the push-pull driver chip is electrically connected to one end of capacitor C6, the output of the voltage regulator circuit, and the center tap of the primary winding of the transformer. The output of the voltage regulator circuit is connected to one end of capacitor C5, and the other end of capacitor C5 is grounded. The other end of capacitor C6 is grounded.

[0041] The input filter circuit is used to filter interference (such as high-frequency ripple interference) from the external power supply (and, in one embodiment, a 12V power supply). Its purpose is to reduce power supply fluctuations and interference, and enhance the circuit's immunity to disturbances. Furthermore, the input filter circuit employs an EMI filter circuit. The EMI filter circuit may include a series of filtering components such as capacitors, common-mode inductors, and differential-mode inductors.

[0042] The voltage regulator circuit is used to reduce the power supply voltage to power the push-pull driver. Further, the voltage regulator circuit employs an LDO module. In this embodiment, the voltage regulator circuit uses a 5V output low-dropout linear regulator to linearly regulate the 12V power supply. The filtered DC power is converted into a stable 5V reference voltage by the low-dropout linear regulator, providing a 5V voltage input to the push-pull power chip; that is, the LDO module in this embodiment converts the 12V voltage to 5V.

[0043] In this invention, the power supply voltage is filtered by the input filter circuit through the interface input to enhance anti-interference capability. The voltage regulator circuit provides voltage through the power supply, and the stepped-down voltage powers the push-pull circuit. The push-pull circuit provides alternating positive and negative voltages to the transformer, which outputs the stepped-up voltage to the boost circuit. The boost circuit then rectifies and doubles the voltage before outputting it. This embodiment of the invention provides a low-cost IGBT driver isolation power supply circuit. A 12V power supply system supplies the LDO circuit, which outputs 5V to power the push-pull circuit. The push-pull circuit provides 7.5V to the voltage multiplier circuit, which rectifies and doubles the output of the push-pull circuit to output 15V.

[0044] This invention's push-pull circuit employs complementary MOSFETs and a high-frequency transformer to achieve both voltage amplitude enhancement and electrical isolation. The final-stage voltage multiplier circuit, based on the charge pump principle, amplifies the push-pull output voltage through the synergistic effect of a fast recovery diode and capacitor. Compared to other drive solutions, this design optimizes the combination of discrete components, eliminating the need for dedicated isolation devices and driver ICs. While achieving a 15V IGBT drive voltage output, it reduces material costs, making it particularly suitable for cost-sensitive applications such as microcars. This solution successfully resolves the technical contradiction of balancing cost, size, and isolation performance in IGBT drive power supplies, providing an innovative solution for the cost reduction of new energy vehicle electronic control systems.

[0045] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An IGBT drive isolated power supply circuit comprising a power supply input and a power supply output, characterized by: A push-pull circuit, a transformer, and a boost circuit are provided between the power input terminal and the power output terminal. The input terminal of the push-pull circuit is electrically connected to the power input terminal, the output terminal of the push-pull circuit is electrically connected to the input side of the transformer, the output side of the transformer is electrically connected to the input terminal of the boost circuit, and the output terminal of the boost circuit is electrically connected to the power output terminal.

2. The IGBT driving isolation power supply circuit according to claim 1, wherein: The push-pull circuit uses a complementary MOSFET structure.

3. The IGBT driving isolation power supply circuit according to claim 1 or 2, characterized by: The push-pull circuit uses a push-pull driver chip to provide alternating positive and negative voltages. The push-pull driver chip has at least an EN pin, a VCC pin, a GND pin, a high-side output pin D1, and a low-side output pin D2. The GND pin of the push-pull driver chip is grounded. The EN pin of the push-pull driver chip is directly or electrically connected to the power input terminal via resistor R1. The VCC pin of the push-pull driver chip is electrically connected to the power input terminal and the center tap of the primary winding of the transformer. The high-side output pin D1 of the push-pull driver chip is electrically connected to the first end of the primary winding of the transformer, and the low-side output pin D2 of the push-pull driver chip is electrically connected to the second end of the primary winding of the transformer.

4. The IGBT driving isolation power supply circuit according to claim 1, wherein: The boost circuit uses a voltage multiplier boost circuit.

5. The IGBT driving isolation power supply circuit according to claim 4, wherein: The voltage multiplier circuit includes several capacitors and several diodes. The positive terminal of diode D1 is electrically connected to the negative output terminal of the power supply, one end of capacitor C7, and one end of capacitor C9. The other end of capacitor C7 is electrically connected to the other end of capacitor C9, one end of capacitor C8, one end of capacitor C10, and one end of the secondary winding of the transformer. The negative terminal of diode D1 is electrically connected to the other end of the secondary winding and the positive terminal of diode D2. The negative terminal of diode D2 is electrically connected to the other end of capacitor C8, the other end of capacitor C10, and the positive output terminal of the power supply.

6. The IGBT driving isolation power supply circuit according to claim 1 or 4 or 5, wherein: It also includes a Zener diode D3, with the positive terminal of Zener diode D3 electrically connected to the negative output terminal of the power supply, and the negative terminal of Zener diode D3 electrically connected to the positive output terminal of the power supply.

7. The IGBT driving isolation power supply circuit according to claim 1 or 4 or 5, wherein: It also includes capacitor C11 and / or capacitor C12, one end of capacitor C11 is electrically connected to the negative output terminal of the power supply, and the other end of capacitor C11 is electrically connected to the positive output terminal of the power supply; one end of capacitor C12 is electrically connected to the negative output terminal of the power supply, and the other end of capacitor C12 is electrically connected to the positive output terminal of the power supply.

8. The IGBT driving isolation power supply circuit according to claim 1, wherein: An input filter circuit and / or a voltage regulator circuit are provided between the input terminal and the power input terminal of the push-pull circuit.

9. The IGBT driving isolation power supply circuit according to claim 8, wherein: The input filter circuit uses an EMI filter circuit.

10. The IGBT driving isolation power supply circuit according to claim 8, wherein: The voltage regulator circuit uses an LDO module.

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