IGBT drive circuit based on FOD8333 optocoupler

Abstract

The utility model relates to the technical field of circuit improvement, in particular to an IGBT (Insulated Gate Bipolar Translator) driving circuit based on an FOD8333 optocoupler. Comprising a first chip, an IGBT tube and an upper computer, a fourth pin of the first chip is divided into two paths, one path is connected with a seventh pin of the upper computer after being connected with a fifth resistor, the other path is connected with a P3.3 V power supply, a sixth pin of the first chip is divided into two paths, one path is connected with a sixth pin of the upper computer after being connected with a sixth resistor, the other path is connected with the P3.3 V power supply, and a eighth pin of the first chip is divided into two paths. One path is connected with a resistor 7 in series and then is connected with a No.23 pin of the upper computer, and the other path is connected with a P3.3 V power supply. Compared with the prior art, a domestic chip is used as a substitute, so that the manufacturing cost can be reduced while the same function is realized, and the dependence on an imported chip is reduced.

Description

Technical Field

[0001] This utility model relates to the field of circuit improvement technology, specifically to an IGBT driving circuit based on the FOD8333 optocoupler. Background Technology

[0002] With the rapid development of intelligent electric actuators, frequency conversion technology is gradually being applied to electric actuators. As the core component of the motor drive system, the design of the IGBT drive circuit affects the performance of the entire circuit.

[0003] Currently, the output torque requirements for electric actuators are increasing, and the power of IGBTs is also rising, leading to a greater need for effective isolation in the drive circuit. Current IGBT drive circuits heavily rely on imported chips, resulting in high costs and transportation difficulties. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, this utility model provides an IGBT driving circuit based on the FOD8333 optocoupler.

[0005] To achieve the above objectives, an IGBT driver circuit based on the FOD8333 optocoupler is designed, including chip one, IGBT transistor, and a host computer. Pin 4 of chip one is split into two paths: one path is connected to pin 37 of the host computer via a series resistor of 5, and the other path is connected to a P3.3V power supply. Pin 6 of chip one is split into two paths: one path is connected to pin 26 of the host computer via a series resistor of 6, and the other path is connected to a P3.3V power supply. Pin 8 of chip one is split into two paths: one path is connected to pin 23 of the host computer via a series resistor of 7, and the other path is connected to a P3.3V power supply. Pin 13 of chip one is split into two paths: one path is connected to pin 27 of the host computer via a series resistor of 3, and the other path is connected to a P3.3V power supply. Pin 15 of chip one is split into two paths: one path is connected to pin 38 of the host computer via a series resistor of 2, and the other path is connected to... For the P3.3V power supply, pin 17 of chip 1 is split into two paths. One path is connected to pin 39 of the host computer via a series resistor of four, and the other path is connected to the P3.3V power supply. Pin 16 of chip 1 is connected to pin 5 and pin 8 of chip 4 via a series resistor of twelve. Pin 14 of chip 1 is connected to pin 5 and pin 8 of chip 9 via a series resistor of fourteen. Pin 12 of chip 1 is connected to pin 5 and pin 8 of chip 8 via a series resistor of sixteen. Pin 7 of chip 1 is connected to pin 5 and pin 8 of chip 7 via a series resistor of twenty-two. Pin 5 of chip 1 is connected to pin 5 and pin 8 of chip 3 via a series resistor of twenty-four. Pin 3 of chip 1 is connected to pin 5 and pin 8 of chip 5 via a series resistor of ten.

[0006] After pin 4 of chips 3, 4, 5, 7, 8, and 9 is connected to pin 1 of each chip, it splits into two paths. One path is connected to ground, and the other path is connected to pin 2 of each chip after being connected in series with a capacitor. Pin 2 of chips 3, 4, 5, 7, 8, and 9 is also connected to the P5-1 power supply.

[0007] Pin 3 of chips 3, 4, 5, 7, 8, and 9 is connected to pin 30 of the host computer.

[0008] Pin 16 of chip 3 is connected to one end of capacitor 17, one end of capacitor 18, the anode of diode 32, and one end of resistor 66. The other end of capacitor 17 is connected to pin 14 of chip 3. The other end of capacitor 18 is connected to pin 13 of chip 3 and one end of resistor 43. The other end of resistor 43 is connected to one end of resistor 40 and the anode of diode 11. The other end of resistor 40 is connected to pin 14 of chip 3. The cathode of diode 11 is connected to the anode of diode 12. The other end of resistor 66 is connected to one end of resistor 53, the cathode of diode 32, and pin 10 of IGBT. The other end of resistor 53 is connected to one end of resistor 19 and the cathode of diode 5. The other end of resistor 19 and the anode of diode 5 are combined and connected to pin 11 of chip 3. Pin 13 of chip 3 is split into two paths: one path is connected in series with capacitor 25 and then connected to pin 12 of chip 3; the other path is connected to the +16V power supply. Pins 12, 10, and 9 of chip 3 are connected to the -8V power supply.

[0009] Pin 16 of chip 4 is connected to one end of capacitor 19, one end of capacitor 20, the anode of diode 31, and one end of resistor 65. The other end of capacitor 19 is connected to pin 14 of chip 4. The other end of capacitor 20 is connected to pin 13 of chip 4 and one end of resistor 44. The other end of resistor 44 is connected to one end of resistor 41 and the anode of diode 13. The other end of resistor 41 is connected to pin 14 of chip 4. The cathode of diode 13 is connected to the anode of diode 14. The other end of resistor 65 is connected to one end of resistor 52, the cathode of diode 31, and pin 7 of IGBT. The other end of resistor 52 is connected to one end of resistor 11 and the cathode of diode 4. The other end of resistor 11 and the anode of diode 4 are combined and connected to pin 11 of chip 4. Pin 13 of chip 4 is split into two paths: one path is connected in series with capacitor 26 and then connected to pin 12 of chip 4; the other path is connected to the +16V power supply. Pins 12, 10, and 9 of chip 4 are connected to the -8V power supply.

[0010] Pin 16 of chip 5 is connected to one end of capacitor 21, one end of capacitor 22, the anode of diode 33, and one end of resistor 67. The other end of capacitor 21 is connected to pin 14 of chip 5. The other end of capacitor 22 is connected to pin 13 of chip 5 and one end of resistor 45. The other end of resistor 45 is connected to one end of resistor 42 and the anode of diode 15. The other end of resistor 42 is connected to pin 14 of chip 5. The cathode of diode 15 is connected to the anode of diode 16. The other end of resistor 67 is connected to one end of resistor 54, the cathode of diode 33, and pin 13 of IGBT. The other end of resistor 54 is connected to one end of resistor 20 and the cathode of diode 6, respectively. The other end of resistor 20 and the anode of diode 6 are combined and connected to pin 11 of chip 5. Pin 13 of chip 5 is split into two paths: one path is connected to pin 12 of chip 5 after being connected in series with capacitor 27, and the other path is connected to the +16V power supply. Pins 12, 10, and 9 of chip 5 are connected to the -8V power supply. The cathodes of diodes 12, 14, and 16 are combined and connected to pins 30, 31, 32, 26, and 27 of IGBT and then connected to UZK.

[0011] Pin 16 of chip 7 is connected to one end of capacitor 34, one end of capacitor 35, pins 33, 34, 35, 19, 21, 24, and 25 of the IGBT, and then connected to GNDD. The other end of capacitor 34 is connected to pin 14 of chip 7. The other end of capacitor 35 is connected to pin 13 of chip 7, one end of resistor 64, one end of resistor 64, one end of diode 25, and the other end of resistor 60 is connected to pin 14 of chip 7. The cathode of diode 25 is connected to the anode of diode 26, and the cathode of diode 26 is connected to pins 14 and 15 of the IGBT. Pin 11 of chip 7 is connected to resistor 25. One end of resistor 7 is connected to the anode of diode 18. The other end of resistor 27 is connected to the cathode of diode 18 and then to one end of resistor 57. The other end of resistor 57 is split into two paths: one path is connected to pin 18 of IGBT, and the other path is connected to one end of resistor 70 and the cathode of diode 36. The other end of resistor 70 is connected to the anode of diode 36 and then to pins 33, 34, 35, 19, 21, 24, and 25 of IGBT, and then to GNDD. Pin 13 of chip 7 is split into two paths: one path is connected in series with capacitor 41 and then to pin 12 of chip 7; the other path is connected to the +16V power supply. Pins 12, 10, and 9 of chip 7 are connected to the -8V power supply.

[0012] Pin 16 of chip 8 is connected to one end of capacitor 36, one end of capacitor 37, pins 33, 34, 35, 19, 21, 24, and 25 of the IGBT, and then connected to GNDD. The other end of capacitor 36 is connected to pin 14 of chip 8. The other end of capacitor 37 is connected to pin 13 of chip 8, one end of resistor 72, one end of resistor 72, one end of resistor 61, and the anode of diode 27. The other end of resistor 61 is connected to pin 14 of chip 8. The cathode of diode 27 is connected to the anode of diode 28, and the cathode of diode 28 is connected to pins 8 and 9 of the IGBT. Pin 11 of chip 8 is connected to resistor 20... One end of resistor 1 is connected to the anode of diode 7. The other end of resistor 21 is connected to the cathode of diode 7 and then to one end of resistor 55. The other end of resistor 55 is split into two paths: one path is connected to pin 22 of IGBT, and the other path is connected to one end of resistor 68 and the cathode of diode 34. The other end of resistor 68 is connected to the anode of diode 34 and then to pins 33, 34, 35, 19, 21, 24, and 25 of IGBT, and then to GNDD. Pin 13 of chip 8 is split into two paths: one path is connected in series with capacitor 42 and then to pin 12 of chip 8; the other path is connected to the +16V power supply. Pins 12, 10, and 9 of chip 8 are connected to the -8V power supply.

[0013] Pin 16 of chip 9 is connected to one end of capacitor 38, one end of capacitor 39, and pins 33, 34, 35, 19, 21, 24, and 25 of the IGBT, and then connected to GNDD. The other end of capacitor 38 is connected to pin 14 of chip 9. The other end of capacitor 39 is connected to pin 13 of chip 9, one end of resistor 73, one end of resistor 73, one end of resistor 62, and the anode of diode 29. The other end of resistor 62 is connected to pin 14 of chip 9. The cathode of diode 29 is connected to the anode of diode 30, and the cathode of diode 30 is connected to pins 11 and 12 of the IGBT. Pin 11 of chip 9 is connected to resistor 23. One end of the resistor is connected to the anode of diode 17. The other end of resistor 23 is connected to the cathode of diode 17 and then to one end of resistor 56. The other end of resistor 56 is split into two paths. One path is connected to pin 20 of IGBT. The other path is connected to one end of resistor 69 and the cathode of diode 35. The other end of resistor 69 is connected to the anode of diode 35 and then to pins 33, 34, 35, 19, 21, 24, and 25 of IGBT, and then to GNDD. Pin 13 of chip 9 is split into two paths. One path is connected in series with capacitor 43 and then to pin 12 of chip 9. The other path is connected to the +16V power supply. Pins 12, 10, and 9 of chip 9 are connected to the -8V power supply.

[0014] The chip mentioned above is model number 74HC244.

[0015] The 4th and 1st pins of chip 3 are combined and then split into two paths. One path connects to one end of capacitor 1, and the other path is grounded. The other end of capacitor 1 is connected to pin 2 of chip 3. The 4th and 1st pins of chip 4 are combined and then split into two paths. One path connects to one end of capacitor 24, and the other path is grounded. The other end of capacitor 24 is connected to pin 2 of chip 4. The 4th and 1st pins of chip 5 are combined and then split into two paths. One path connects to one end of capacitor 16, and the other path is grounded. The other end of capacitor 16 is connected to pin 2 of chip 5. The 4th and 1st pins of chip 7 are combined and then split into two paths. One path connects to one end of capacitor 29, and the other path is grounded. The other end of capacitor 29 is connected to pin 2 of chip 7. The 4th and 1st pins of chip 8 are combined and then split into two paths. One path connects to one end of capacitor 30, and the other path is grounded. The other end of capacitor 30 is connected to pin 2 of chip 8. The 4th and 1st pins of chip 9 are combined and then split into two paths. One path connects to one end of capacitor 31, and the other path is grounded. The other end of capacitor 31 is connected to pin 2 of chip 9.

[0016] Chip 3, Chip 4, Chip 5, Chip 7, Chip 8, and Chip 9 are model number FOD8333.

[0017] The host computer is model AT32F415RCT7-7 / LQFP64.

[0018] The IGBT tube in question is model GD75PIY120C6SN.

[0019] Compared with the prior art, this utility model uses domestically produced chips as a substitute, which can reduce manufacturing costs and reduce dependence on imported chips while achieving the same function. Attached Figure Description

[0020] Figure 1 This is the circuit diagram of this utility model.

[0021] Figure 2 This is a partial enlargement of the circuit of this utility model. Figure 1 .

[0022] Figure 3 This is a partial enlargement of the circuit of this utility model. Figure 2 . Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings.

[0024] like Figures 1 to 3As shown, pin 4 of chip U1 is split into two paths, connected to one end of resistor R5 and the P3.3V power supply respectively. The other end of resistor R5 is connected to pin 37 of the host computer CPU1. Pin 6 of chip U1 is split into two paths, connected to one end of resistor R6 and the P3.3V power supply respectively. The other end of resistor R6 is connected to pin 26 of the host computer CPU1. Pin 8 of chip U1 is split into two paths, connected to one end of resistor R7 and the P3.3V power supply respectively. The other end of resistor R7 is connected to pin 23 of the host computer CPU1. Pin 13 of chip U1 is split into two paths, one connected to one end of resistor R3 and the other to the P3.3V power supply. The other end of resistor R3 is connected to pin 27 of the host computer CPU1. Pin 15 of chip U1 is also split into two paths, one connected to one end of resistor R2 and the other to the P3.3V power supply. The other end of resistor R2 is connected to pin 38 of the host computer CPU1. Pin 17 of chip U1 is split into two paths, one connected to one end of resistor R4 and the other to the P3.3V power supply. The other end of resistor R4 is connected to pin 39 of the host computer CPU1. Pin 16 of chip 1U1 is connected to one end of resistor 12R12. The other end of resistor 12R12 is connected to pins 5 and 8 of chip 4U4. Pin 14 of chip 1U1 is connected to one end of resistor 14R14. The other end of resistor 14R14 is connected to pins 5 and 8 of chip 9U9. Pin 12 of chip 1U1 is connected to one end of resistor 16R16. The other end of resistor 16R16 is connected to pins 5 and 8 of chip 8U8. Pin 7 of chip 1 U1 is connected to one end of resistor 22R22. The other end of resistor 22R22 is connected to pin 5 and pin 8 of chip 7 U7. Pin 5 of chip 1 U1 is connected to one end of resistor 24R24. The other end of resistor 24R24 is connected to pin 5 and pin 8 of chip 3 U3. Pin 3 of chip 1 U1 is connected to one end of resistor 10R10. The other end of resistor 10R10 is connected to pin 5 and pin 8 of chip 5 U5.

[0025] After pin 4 of chips 3U3, 4U4, 5U5, 7U7, 8U8, and 9U9 is connected to pin 1 of each chip, it splits into two paths. One path is connected to ground M1, and the other path is connected to pin 2 of each chip after being connected in series with a capacitor. Pin 2 of chips 3U3, 4U4, 5U5, 7U7, 8U8, and 9U9 is also connected to the P5-1 power supply.

[0026] Pin 3 of chips U3, U4, U5, U7, U8, and U9 is connected to pin 30 of the host computer CPU1.

[0027] Pin 16 of chip 3U3 is connected to one end of capacitor 17C17, one end of capacitor 18C18, the anode of diode 32D32, and one end of resistor 66R66. The other end of capacitor 17C17 is connected to pin 14 of chip 3U3. The other end of capacitor 18C18 is connected to pin 13 of chip 3U3, one end of resistor 43R43, one end of resistor 43R43, one end of resistor 40R40, the anode of diode 11D11, and the other end of resistor 40R40 is connected to pin 14 of chip 3U3. The cathode of diode 11D11 is connected to the anode of diode 12D12. The other end of resistor R66 is connected to one end of resistor R53, the cathode of diode D32, and pin 10 of IGBT U11. The other end of resistor R53 is connected to one end of resistor R19 and the cathode of diode D5. The other end of resistor R19 and the anode of diode D5 are combined and connected to pin 11 of chip U3. Pin 13 of chip U3 is split into two paths: one path is connected to pin 12 of chip U3 after being connected in series with capacitor C25, and the other path is connected to the +16V power supply. Pins 12, 10, and 9 of chip U3 are connected to the -8V power supply.

[0028] Pin 16 of chip 4U4 is connected to one end of capacitor 19C19, one end of capacitor 20C20, the anode of diode 31D31, and one end of resistor 65R65. The other end of capacitor 19C19 is connected to pin 14 of chip 4U4. The other end of capacitor 20C20 is connected to pin 13 of chip 4U4 and one end of resistor 44R44. The other end of resistor 44R44 is connected to one end of resistor 41R41 and the anode of diode 13D13. The other end of resistor 41R41 is connected to pin 14 of chip 4U4. The cathode of diode 13D13 is connected to the anode of diode 14D14. The other end of resistor 65R65 is connected to one end of resistor 52R52, the cathode of diode 31D31, and pin 7 of IGBT U11. The other end of resistor 52R52 is connected to one end of resistor 11R11 and the cathode of diode 4D4. The other end of resistor 11R11 and the anode of diode 4D4 are combined and connected to pin 11 of chip 4U4. Pin 13 of chip 4U4 is split into two paths: one path is connected in series with capacitor 26C26 and then connected to pin 12 of chip 4U4; the other path is connected to the +16V power supply. Pins 12, 10, and 9 of chip 4U4 are connected to the -8V power supply.

[0029] Pin 16 of chip 5U5 is connected to one end of capacitor 21C21, one end of capacitor 22C22, the anode of diode 33D33, and one end of resistor 67R67. The other end of capacitor 21C21 is connected to pin 14 of chip 5U5. The other end of capacitor 22C22 is connected to pin 13 of chip 5U5, one end of resistor 45R45, one end of resistor 45R45, one end of resistor 42R42, the anode of diode 15D15, and the other end of resistor 42R42 is connected to pin 14 of chip 5U5. The cathode of diode 15D15 is connected to the anode of diode 16D16. The other end of resistor 67R67 is connected to one end of resistor 54R54, the cathode of diode 33D33, and I... Pin 13 of GBT U11 is connected to one end of resistor 54R54 and the cathode of diode 6D6. The other end of resistor 20R20 and the anode of diode 6D6 are connected together to pin 11 of chip 5U5. Pin 13 of chip 5U5 is split into two paths: one path is connected to pin 12 of chip 5U5 after being connected in series with capacitor 27C27, and the other path is connected to the +16V power supply. Pins 12, 10, and 9 of chip 5U5 are connected to the -8V power supply. The cathodes of diodes 12D12, 14D14, and 16D16 are connected together to pins 30, 31, 32, 26, and 27 of IGBT U11 and then connected to UZK.

[0030] Pin 16 of chip 7U7 is connected to one end of capacitor 34C34, one end of capacitor 35C35, pins 33, 34, 35, 19, 21, 24, and 25 of IGBT U11, and then connected to GNDD. The other end of capacitor 34C34 is connected to pin 14 of chip 7U7. The other end of capacitor 35C35 is connected to pin 13 of chip 7U7, one end of resistor 64R64, the other end of resistor 64R64 is connected to one end of resistor 60R60, the anode of diode 25D25, the other end of resistor 60R60 is connected to pin 14 of chip 7U7, the cathode of diode 25D25 is connected to the anode of diode 26D26, the cathode of diode 26D26 is connected to pins 14 and 15 of IGBT U11, and pin 11 of chip 7U7 is connected to... One end of resistor 27R27 and the anode of diode 18D18 are connected together. The other end of resistor 27R27 and the cathode of diode 18D18 are then connected to one end of resistor 57R57. The other end of resistor 57R57 is split into two paths: one path is connected to pin 18 of IGBT U11, and the other path is connected to one end of resistor 70R70 and the cathode of diode 36D36. The other end of resistor 70R70 and the anode of diode 36D36 are then connected together to pins 33, 34, 35, 19, 21, 24, and 25 of IGBT U11 and connected to GNDD. Pin 13 of chip 7U7 is split into two paths: one path is connected in series with capacitor 41C41 and then to pin 12 of chip 7U7; the other path is connected to a +16V power supply. Pins 12, 10, and 9 of chip 7U7 are connected to a -8V power supply.

[0031] Pin 16 of chip 8U8 is connected to one end of capacitor 36C36, one end of capacitor 37C37, pins 33, 34, 35, 19, 21, 24, and 25 of IGBT U11, and then connected to GNDD. The other end of capacitor 36C36 is connected to pin 14 of chip 8U8. The other end of capacitor 37C37 is connected to pin 13 of chip 8U8, one end of resistor 72R72, one end of resistor 72R72, one end of resistor 61R61, the anode of diode 27D27, and the other end of resistor 61R61 is connected to pin 14 of chip 8U8. The cathode of diode 27D27 is connected to the anode of diode 28D28, and the cathode of diode 28D28 is connected to pins 8 and 9 of IGBT U11. Pin 11 of chip 8U8 is connected to... One end of resistor 21R21 is connected to the anode of diode 7D7. The other end of resistor 21R21 is connected to the cathode of diode 7D7 and then to one end of resistor 55R55. The other end of resistor 55R55 is split into two paths: one path is connected to pin 22 of IGBT U11, and the other path is connected to one end of resistor 68R68 and the cathode of diode 34D34. The other end of resistor 68R68 is connected to the anode of diode 34D34 and then to pins 33, 34, 35, 19, 21, 24, and 25 of IGBT U11 and then to GNDD. Pin 13 of chip 8U8 is split into two paths: one path is connected in series with capacitor 42C42 and then to pin 12 of chip 8U8; the other path is connected to the +16V power supply. Pins 12, 10, and 9 of chip 8U8 are connected to the -8V power supply.

[0032] Pin 16 of chip 9U9 is connected to one end of capacitor 38C38, one end of capacitor 39C39, pins 33, 34, 35, 19, 21, 24, and 25 of IGBT U11, and then connected to GNDD. The other end of capacitor 38C38 is connected to pin 14 of chip 9U9. The other end of capacitor 39C39 is connected to pin 13 of chip 9U9, one end of resistor 73R73, one end of resistor 73R73 is connected to one end of resistor 62R62, the anode of diode 29D29, the other end of resistor 62R62 is connected to pin 14 of chip 9U9, the cathode of diode 29D29 is connected to the anode of diode 30D30, the cathode of diode 30D30 is connected to pins 11 and 12 of IGBT U11, and pin 11 of chip 9U9 is connected to resistor... One end of resistor 23R23 is connected to the anode of diode 17D17. The other end of resistor 23R23 is connected to the cathode of diode 17D17 and then to one end of resistor 56R56. The other end of resistor 56R56 is split into two paths: one path is connected to pin 20 of IGBT U11, and the other path is connected to one end of resistor 69R69 and the cathode of diode 35D35. The other end of resistor 69R69 is connected to the anode of diode 35D35 and then to pins 33, 34, 35, 19, 21, 24, and 25 of IGBT U11 and then to GNDD. Pin 13 of chip 9U9 is split into two paths: one path is connected in series with capacitor 43C43 and then to pin 12 of chip 9U9, and the other path is connected to the +16V power supply. Pins 12, 10, and 9 of chip 9U9 are connected to the -8V power supply. After connecting pins 6 and 7 of chips U3, U4, U5, U7, U8, and U9, the drive pulse DRV is connected.

[0033] Specifically, pins 4 and 1 of chip 3U3 are combined and then split into two paths. One path connects to one end of capacitor 1C1, and the other path is grounded. The other end of capacitor 1C1 is connected to pin 2 of chip 3U3. Similarly, pins 4 and 1 of chip 4U4 are combined and then split into two paths. One path connects to one end of capacitor 24C24, and the other path is grounded. The other end of capacitor 24C24 is connected to pin 2 of chip 4U4. Likewise, pins 4 and 1 of chip 5U5 are combined and then split into two paths. One path connects to one end of capacitor 16C16, and the other path is grounded. The other end of capacitor 16C16 is connected to pin 2 of chip 5U5. Pins 4 and 1 of chip 7U7 are combined and then split into two paths. One path connects to one end of capacitor 29C29, and the other path is grounded. The other end of capacitor 29C29 is connected to pin 2 of chip 7U7. Pins 4 and 1 of chip 8U8 are combined and then split into two paths. One path connects to one end of capacitor 30C30, and the other path is grounded. The other end of capacitor 30C30 is connected to pin 2 of chip 8U8. Pins 4 and 1 of chip 9U9 are combined and then split into two paths. One path connects to one end of capacitor 31C31, and the other path is grounded. The other end of capacitor 31C31 is connected to pin 2 of chip 9U9.

[0034] In this embodiment, chip U1 is model 74HC244. Chips U3, U4, U5, U7, U8, and U9 are model FOD8333. The host computer CPU1 is model AT32F415RCT7-7 / LQFP64. IGBT U11 is model GD75PIY120C6SN.

[0035] This embodiment utilizes several FOD8333 chips to implement an IGBT drive circuit, enabling frequency conversion output based on signals from the host computer CPU1. During operation, chip U1 of the 74HC244 isolates the host computer CPU1 signals from the input signals of chips U3, U4, U5, U7, U8, and U9. Chips U3, U4, U5, U7, U8, and U9 respectively control the three internal outputs of the IGBT. Chips U3, U4, U5, U7, U8, and U9 control the on / off state of the upper bridge arm switching transistors, while chips U7, U8, and U9 control the on / off state of the lower bridge arm switching transistors.

[0036] Under normal operating conditions, chips U3 (three), U4 (four), U5 (five), U7 (seven), U8 (eight), and U9 respond to signals from the host computer to control the conduction state of the internal switching transistors of the IGBT. This allows for PWM pulse width modulation of the voltage signal rectified by the bridge rectifier, achieving DC-AC conversion and frequency conversion. The system is low-cost and offers high electrical isolation and reliability.

Claims

1. An IGBT driving circuit based on FOD8333 optocoupler, comprising a chip, an IGBT transistor, and a host computer, characterized in that: Pin 4 of chip one (U1) is split into two paths: one path is connected to pin 37 of the host computer (CPU1) via a series resistor 5 (R5), and the other path is connected to the P3.3V power supply. Pin 6 of chip one (U1) is also split into two paths: one path is connected to pin 26 of the host computer (CPU1) via a series resistor 6 (R6), and the other path is connected to the P3.3V power supply. Pin 8 of chip one (U1) is split into two paths: one path is connected to pin 23 of the host computer (CPU1) via a series resistor 7 (R7), and the other path is connected to the P3.3V power supply. The circuit connects to the P3.3V power supply. Pin 13 of chip one (U1) is split into two paths: one path is connected to pin 27 of the host computer (CPU1) via series resistor three (R3), and the other path connects to the P3.3V power supply. Pin 15 of chip one (U1) is also split into two paths: one path is connected to pin 38 of the host computer (CPU1) via series resistor two (R2), and the other path connects to the P3.3V power supply. Pin 17 of chip one (U1) is also split into two paths: one path is connected to pin 38 of the host computer (CPU1) via series resistor four (R4), and the other path connects to the P3.3V power supply. 1) Pin 39 of chip 1 is connected to a P3.3V power supply on the other side. Pin 16 of chip 1 (U1) is connected to pin 5 of chip 4 (U4) and pin 8 of chip 4 (U4) via a series resistor 14 (R14). Pin 14 of chip 1 (U1) is connected to pin 5 of chip 9 (U9) and pin 8 of chip 9 (U9). Pin 12 of chip 1 (U1) is connected to pin 5 of chip 8 (U8) via a series resistor 16 (R16). Pin 8 of chip 8 (U8) and pin 7 of chip 1 (U1) are connected in series with resistor 22 (R22) to pin 5 of chip 7 (U7) and pin 8 of chip 7 (U7). Pin 5 of chip 1 (U1) is connected in series with resistor 24 (R24) to pin 5 of chip 3 (U3) and pin 8 of chip 3 (U3). Pin 3 of chip 1 (U1) is connected in series with resistor 10 (R10) to pin 5 of chip 5 (U5) and pin 8 of chip 5 (U5). After connecting pin 4 of chips 3 (U3), 4 (U4), 5 (U5), 7 (U7), 8 (U8), and 9 (U9) to pin 1 of each chip, the connection splits into two paths. One path is connected to ground (M1), and the other path is connected to pin 2 of each chip after being connected in series with a capacitor. Pin 2 of chips 3 (U3), 4 (U4), 5 (U5), 7 (U7), 8 (U8), and 9 (U9) is also connected to the P5-1 power supply. Pin 3 of chips 3 (U3), 4 (U4), 5 (U5), 7 (U7), 8 (U8), and 9 (U9) is connected to pin 30 of the host computer (CPU1). Pin 16 of chip 3 (U3) is connected to one end of capacitor 17 (C17), one end of capacitor 18 (C18), the anode of diode 32 (D32), and one end of resistor 66 (R66). The other end of capacitor 17 (C17) is connected to pin 14 of chip 3 (U3). The other end of capacitor 18 (C18) is connected to pin 13 of chip 3 (U3) and one end of resistor 43 (R43). The other end of resistor 43 (R43) is connected to one end of resistor 40 (R40) and the anode of diode 11 (D11). The other end of resistor 40 (R40) is connected to pin 14 of chip 3 (U3). The cathode of diode 11 (D11) is connected to the anode of diode 12 (D12). The other end of resistor 66 (R66) is connected to one end of resistor 53 (R53), the cathode of diode 32 (D32), and pin 10 of IGBT (U11). The other end of resistor 53 (R53) is connected to one end of resistor 19 (R19) and the cathode of diode 5 (D5). The other end of resistor 19 (R19) and the anode of diode 5 (D5) are combined and connected to pin 11 of chip 3 (U3). Pin 13 of chip 3 (U3) is split into two paths: one path is connected in series with capacitor 25 (C25) and then connected to pin 12 of chip 3 (U3); the other path is connected to the +16V power supply. Pins 12, 10, and 9 of chip 3 (U3) are connected to the -8V power supply. Pin 16 of chip 4 (U4) is connected to one end of capacitor 19 (C19), one end of capacitor 20 (C20), the anode of diode 31 (D31), and one end of resistor 65 (R65). The other end of capacitor 19 (C19) is connected to pin 14 of chip 4 (U4). The other end of capacitor 20 (C20) is connected to pin 13 of chip 4 (U4) and one end of resistor 44 (R44). The other end of resistor 44 (R44) is connected to one end of resistor 41 (R41) and the anode of diode 13 (D13). The other end of resistor 41 (R41) is connected to pin 14 of chip 4 (U4). The cathode of diode 13 (D13) is connected to the cathode of diode 14 (D14). The anode of resistor 65 (R65) is connected to one end of resistor 52 (R52), the cathode of diode 31 (D31), and pin 7 of IGBT (U11). The other end of resistor 52 (R52) is connected to one end of resistor 11 (R11) and the cathode of diode 4 (D4). The other end of resistor 11 (R11) and the anode of diode 4 (D4) are combined and connected to pin 11 of chip 4 (U4). Pin 13 of chip 4 (U4) is split into two paths: one path is connected in series with capacitor 26 (C26) and then connected to pin 12 of chip 4 (U4); the other path is connected to the +16V power supply. Pins 12, 10, and 9 of chip 4 (U4) are connected to the -8V power supply. Pin 16 of chip 5 (U5) is connected to one end of capacitor 21 (C21), one end of capacitor 22 (C22), the anode of diode 33 (D33), and one end of resistor 67 (R67). The other end of capacitor 21 (C21) is connected to pin 14 of chip 5 (U5). The other end of capacitor 22 (C22) is connected to pin 13 of chip 5 (U5) and one end of resistor 45 (R45). The other end of resistor 45 (R45) is connected to one end of resistor 42 (R42) and the anode of diode 15 (D15). The other end of resistor 42 (R42) is connected to pin 14 of chip 5 (U5). The cathode of diode 15 (D15) is connected to the anode of diode 16 (D16). The other end of resistor 67 (R67) is connected to one end of resistor 54 (R54) and diode 33 (D33). The cathode of the IGBT (U11) and pin 13 of the IGBT are connected together. The other end of resistor 54 (R54) is connected to one end of resistor 20 (R20) and the cathode of diode 6 (D6). The other end of resistor 20 (R20) and the anode of diode 6 (D6) are combined and connected to pin 11 of chip 5 (U5). Pin 13 of chip 5 (U5) is split into two paths. One path is connected to pin 12 of chip 5 (U5) after being connected in series with capacitor 27 (C27). The other path is connected to the +16V power supply. Pins 12, 10, and 9 of chip 5 (U5) are connected to the -8V power supply. The cathodes of diode 12 (D12), diode 14 (D14), and diode 16 (D16) are combined and connected to pins 30, 31, 32, 26, and 27 of IGBT (U11) and then connected to UZK. Pin 16 of chip 7 (U7) is connected to one end of capacitor 34 (C34), one end of capacitor 35 (C35), and pins 33, 34, 35, 19, 21, 24, and 25 of IGBT transistor (U11), and then connected to GNDD. The other end of capacitor 34 (C34) is connected to pin 14 of chip 7 (U7), and the other end of capacitor 35 (C35) is connected to pin 13 of chip 7 (U7) and resistor 6. One end of resistor 64 (R64) is connected to one end of resistor 60 (R60) and the anode of diode 25 (D25), respectively. The other end of resistor 60 (R60) is connected to pin 14 of chip 7 (U7). The cathode of diode 25 (D25) is connected to the anode of diode 26 (D26), and the cathode of diode 26 (D26) is connected to pins 14 and 15 of IGBT (U11). Pin 11 of chip 7 (U7) is connected to... Connect one end of resistor 27 (R27) to the anode of diode 18 (D18). The other end of resistor 27 (R27) and the cathode of diode 18 (D18) are then connected together to one end of resistor 57 (R57). The other end of resistor 57 (R57) splits into two paths: one connects to pin 18 of IGBT (U11), and the other connects to one end of resistor 70 (R70) and the cathode of diode 36 (D36). The other end of resistor 70 (R70) is connected to the cathode of diode... After the anode connection of chip 36 (D36) is made, it is connected to pins 33, 34, 35, 19, 21, 24, and 25 of IGBT (U11) and then connected to GNDD. Pin 13 of chip 7 (U7) is split into two paths: one path is connected in series with capacitor 41 (C41) and then connected to pin 12 of chip 7 (U7); the other path is connected to the +16V power supply. Pins 12, 10, and 9 of chip 7 (U7) are connected to the -8V power supply. Pin 16 of chip 8 (U8) is connected to one end of capacitor 36 (C36), one end of capacitor 37 (C37), and pins 33, 34, 35, 19, 21, 24, and 25 of IGBT transistor (U11), and then connected to GNDD. The other end of capacitor 36 (C36) is connected to pin 14 of chip 8 (U8), and the other end of capacitor 37 (C37) is connected to pin 13 of chip 8 (U8) and resistor 7. One end of resistor 72 (R72) is connected to one end of resistor 61 (R61) and the anode of diode 27 (D27), respectively. The other end of resistor 61 (R61) is connected to pin 14 of chip 8 (U8). The cathode of diode 27 (D27) is connected to the anode of diode 28 (D28), and the cathode of diode 28 (D28) is connected to pins 8 and 9 of IGBT (U11). Pin 11 of chip 8 (U8) is connected to... Connect one end of resistor 21 (R21) to the anode of diode 7 (D7). Then connect the other end of resistor 21 (R21) and the cathode of diode 7 (D7) together to one end of resistor 55 (R55). The other end of resistor 55 (R55) splits into two paths: one connects to pin 22 of IGBT (U11), and the other connects to one end of resistor 68 (R68) and the cathode of diode 34 (D34). The other end of resistor 68 (R68) connects to the cathode of diode 34 (D34). After the anode of the fourteenth (D34) is connected, it is connected to pins 33, 34, 35, 19, 21, 24, and 25 of the IGBT (U11) and then connected to GNDD. Pin 13 of the eighth chip (U8) is split into two paths. One path is connected in series with capacitor forty-two (C42) and then connected to pin 12 of the eighth chip (U8). The other path is connected to the +16V power supply. Pins 12, 10, and 9 of the eighth chip (U8) are connected to the -8V power supply. Pin 16 of chip 9 (U9) is connected to one end of capacitor 38 (C38), one end of capacitor 39 (C39), and pins 33, 34, 35, 19, 21, 24, and 25 of IGBT transistor (U11), and then connected to GNDD. The other end of capacitor 38 (C38) is connected to pin 14 of chip 9 (U9), and the other end of capacitor 39 (C39) is connected to pin 13 of chip 9 (U9) and resistor 70. One end of resistor 73 (R73) is connected to one end of resistor 62 (R62) and the anode of diode 29 (D29), respectively. The other end of resistor 62 (R62) is connected to pin 14 of chip 9 (U9). The cathode of diode 29 (D29) is connected to the anode of diode 30 (D30), and the cathode of diode 30 (D30) is connected to pins 11 and 12 of IGBT (U11). Pin 11 of chip 9 (U9) is connected to... Connect one end of resistor 23 (R23) to the anode of diode 17 (D17). The other end of resistor 23 (R23) and the cathode of diode 17 (D17) are then connected together to one end of resistor 56 (R56). The other end of resistor 56 (R56) splits into two paths: one connects to pin 20 of IGBT (U11), and the other connects to one end of resistor 69 (R69) and the cathode of diode 35 (D35). The other end of resistor 69 (R69) is connected to the cathode of diode... After the anode connection of the 35 (D35) chip, it is connected to pins 33, 34, 35, 19, 21, 24, and 25 of the IGBT (U11) and then connected to GNDD. Pin 13 of chip 9 (U9) is split into two paths: one path is connected to pin 12 of chip 9 (U9) after being connected in series with capacitor 43 (C43), and the other path is connected to the +16V power supply. Pins 12, 10, and 9 of chip 9 (U9) are connected to the -8V power supply.

2. The IGBT driving circuit based on FOD8333 optocoupler according to claim 1, characterized in that: The chip 1 (U1) is model number 74HC244.

3. The IGBT driving circuit based on FOD8333 optocoupler according to claim 1, characterized in that: The fourth and first pins of chip three (U3) are combined and then split into two paths. One path connects to one end of capacitor one (C1), and the other path is grounded. The other end of capacitor one (C1) is connected to pin 2 of chip three (U3). Similarly, the fourth and first pins of chip four (U4) are combined and then split into two paths. One path connects to one end of capacitor twenty-four (C24), and the other path is grounded. The other end of capacitor twenty-four (C24) is connected to pin 2 of chip four (U4). The fourth and first pins of chip five (U5) are combined and then split into two paths. One path connects to one end of capacitor sixteen (C16), and the other path is grounded. The other end of capacitor sixteen (C16) is connected to pin 2 of chip five (U5). Pins 4 and 1 of chip 7 (U7) are combined and then split into two paths. One path connects to one end of capacitor 29 (C29), and the other path is grounded. The other end of capacitor 29 (C29) is connected to pin 2 of chip 7 (U7). Pins 4 and 1 of chip 8 (U8) are combined and then split into two paths. One path connects to one end of capacitor 30 (C30), and the other path is grounded. The other end of capacitor 30 (C30) is connected to pin 2 of chip 8 (U8). Pins 4 and 1 of chip 9 (U9) are combined and then split into two paths. One path connects to one end of capacitor 31 (C31), and the other path is grounded. The other end of capacitor 31 (C31) is connected to pin 2 of chip 9 (U9).

4. An IGBT driving circuit based on a FOD8333 optocoupler according to claim 1 or 3, characterized in that: The model number of chips 3 (U3), 4 (U4), 5 (U5), 7 (U7), 8 (U8), and 9 (U9) is FOD8333.

5. The IGBT driving circuit based on the FOD8333 optocoupler according to claim 1, characterized in that: The host computer (CPU1) is model AT32F415RCT7-7 / LQFP64.

6. The IGBT driving circuit based on FOD8333 optocoupler according to claim 1, characterized in that: The IGBT tube (U11) mentioned is model GD75PIY120C6SN.

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