IGBT (Insulated Gate Bipolar Translator) driving system of new energy electric vehicle

Abstract

The invention discloses an IGBT (Insulated Gate Bipolar Translator) driving system of a new energy electric vehicle. The IGBT driving system comprises a high-voltage flyback power supply module, an LDO (Low Dropout Regulator) circuit module, an ASC logic judgment circuit, an IGBT driving circuit module, a high-voltage flyback power supply module for taking power from a high-voltage battery pack of the whole vehicle, an IGBT driving chip for supplying power to the LDO circuit module after performing level conversion on high-voltage power, the LDO circuit module is connected with the ASC logic judgment circuit; the ASC logic judgment circuit is connected with the IGBT driving chip, and the ASC logic judgment circuit generates an ASC enable signal to enable the IGBT driving chip to enter an ASC mode. According to the invention, when the power supply of the high-voltage battery pack accidentally fails, the IGBT driving system can still enter the safety state of ASC active short circuit.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy vehicles, and in particular to an IGBT drive system for a new energy electric vehicle. Background Art

[0003] At present, the driving circuits of new energy vehicle drive controllers are all converted from the power of the car battery. When the low-voltage battery loses power unexpectedly and the high-voltage battery pack of the vehicle loses power to below 60V due to protection measures, the vehicle cannot enter the safety mode. When the vehicle is driving at high speed, it will cause great harm to people and even endanger their lives. Summary of the invention

[0004] The present invention provides an IGBT drive system for a new energy electric vehicle. The present invention can ensure that when a high-voltage battery pack power supply fails unexpectedly, the IGBT drive system can still enter a safe state of ASC active short circuit.

[0005] The technical solutions to the above problems are as follows:

[0006] An IGBT drive system for a new energy electric vehicle comprises a high-voltage flyback power supply module, an LDO circuit module, an ASC logic judgment circuit, and an IGBT drive circuit module. The high-voltage flyback power supply module takes power from a high-voltage battery pack of the whole vehicle, and performs level conversion on the high-voltage power before supplying power to the LDO circuit module and the IGBT drive chip. The LDO circuit module is connected to the ASC logic judgment circuit. The ASC logic judgment circuit is connected to the IGBT drive chip. The ASC logic judgment circuit generates an ASC enable signal to enable the IGBT drive chip to enter the ASC mode.

[0007] The high-voltage flyback power supply module comprises:

[0008] The main power part converts the high voltage into a level; the output end of the main power part is connected to the LDO circuit module;

[0009] A power voltage divider connected to the output end of the main power part separates the output power of the main power part into positive voltage and negative voltage;

[0010] The control part controls the output voltage, and the control part is connected to the main power part and the power supply voltage dividing part.

[0011] The present invention has the following beneficial effects:

[0012] 1. The power supply of the driver chip is divided into upper bridge arm power supply and lower bridge arm power supply, and different topologies are used to build the circuit to avoid single point failure.

[0013] 2. The high-voltage flyback power supply adopts the secondary side voltage feedback solution, which has a more stable output voltage, higher efficiency and better IGBT drive consistency.

[0014] 3. The high-voltage flyback power supply adopts a wide voltage input, and the operating voltage range is 30V-470V. Even if the vehicle enters the emergency discharge mode (discharging the high voltage to below 60V) due to the safety status of the whole vehicle, the high-voltage flyback power supply can still work normally for a short time, allowing the motor controller to enter the lower bridge ASC state.

[0015] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a circuit block diagram of an IGBT drive system for a new energy electric vehicle according to the present invention;

[0017] Figure 2 This is a circuit schematic diagram of an IGBT drive system for a new energy electric vehicle of the present invention;

[0018] Figure 3 It is a circuit diagram of the secondary first winding and the first rectifier and filter circuit.

[0019] Figure 4 The circuit schematic diagram of one of the secondary side second windings, the second rectifier filter circuit and the power supply voltage divider part.

[0020] Figure 5 Schematic diagram of the LDO circuit module. DETAILED DESCRIPTION

[0021] like Figures 1 to 5 As shown, an IGBT drive system of a new energy electric vehicle of the present invention includes a high-voltage flyback power supply module, an LDO circuit module, an ASC logic judgment circuit, and an IGBT drive circuit module. The high-voltage flyback power supply module takes power from the high-voltage battery pack of the whole vehicle, and converts the high-voltage power level and supplies power to the LDO circuit module and the IGBT drive chip. The following is a detailed description of each part and the relationship between them.

[0022] The high-voltage flyback power supply module includes a main power part, a power supply voltage dividing part, and a control part for controlling the output voltage.

[0023] The main power part converts the high voltage electricity level, and the output end of the main power part is connected to the LDO circuit module; the main power part includes a flyback transformer T1, an RCD absorption circuit, and a rectifier filter circuit. The flyback transformer T1 has a primary main winding, a primary secondary winding, a secondary first winding, multiple secondary second windings, a first rectifier filter circuit, and a second rectifier filter circuit. The primary main winding is connected to the RCD absorption circuit, the primary secondary winding is connected to the rectifier filter circuit, the secondary first winding is connected to the first rectifier filter circuit, and each secondary second winding is connected to a second rectifier filter circuit.

[0024] The primary main winding has four pins, namely Pin6, Pin7, Pin8, and Pin9, wherein Pin7 is connected to Pin8, and the primary secondary winding has two pins, namely Pin4 and Pin5.

[0025] The RCD absorption circuit includes a first resistor R1, a third resistor R3, a third capacitor C3, a third rectifier diode D3, a TVS diode ZD1, and a third capacitor C3. One end of the first resistor R1 and one end of the third capacitor C3 are respectively used to connect to the positive terminal of the high-voltage battery pack of the whole vehicle. Pin6 of the primary main winding of the flyback transformer T1 is also connected to the positive terminal of the high-voltage battery pack of the whole vehicle. The other end of the first resistor R1 is connected to the anode terminal of the TVS diode ZD1, the cathode terminal of the TVS diode ZD1 and the other end of the third capacitor C3 are respectively connected to one end of the third resistor R3, the other end of the third resistor R3 is connected to the cathode terminal of the third rectifier diode D3, the anode terminal of the third rectifier diode D3 is connected to the primary main winding of the flyback transformer T1, and the anode terminal of the third rectifier diode D3 is connected to Pin9 of the primary main winding of the flyback transformer T1.

[0026] The rectifier and filter circuit includes a twelfth capacitor C12, a sixteenth capacitor C16, a ninth resistor R9, and a fifth rectifier diode D5. One end of the twelfth capacitor C12 is connected to the cathode end of the fifth rectifier diode D5, the anode end of the fifth rectifier diode D5 is connected to the primary secondary winding of the flyback transformer T1, the anode end of the fifth rectifier diode D5 is connected to Pin4 of the primary secondary winding of the flyback transformer T1, and Pin5 of the primary secondary winding of the flyback transformer T1 is connected to the negative end of the vehicle high-voltage battery pack. One end of the sixteenth capacitor C16 and the ninth resistor R9 are respectively connected to the control part, one end of the sixteenth capacitor C16 and the ninth resistor R9 are respectively connected to the isolation chip U1 of the control part, the other end of the sixteenth capacitor C16 is connected to the other end of the twelfth capacitor C12, and the other end of the ninth resistor R9 is connected to the cathode end of the fifth rectifier diode D5.

[0027] The twelfth capacitor C12 is arranged after the fifth rectifier diode D5 and plays a role of filtering and energy storage. The ninth resistor R9 is a current limiting resistor. The ninth resistor R9 and the sixteenth capacitor C16 form an RC filter.

[0028] The main power part also includes a sixth capacitor C6, which is a storage capacitor. One end of the sixth capacitor C6 is connected to the positive terminal of the vehicle's high-voltage battery pack, and the other end of the sixth capacitor C6 is connected to the negative terminal of the vehicle's high-voltage battery pack.

[0029] The first secondary winding has two pins, namely Pin1 and Pin2, the second secondary winding has three pins, namely secondary second winding one, secondary second winding two, and secondary second winding three. The second secondary winding one has two pins, namely Pin18 and Pin16, the second secondary winding two has two pins, namely Pin15 and Pin13, and the second secondary winding three has two pins, namely Pin12 and Pin10 (the pins in the primary winding and the secondary winding are omitted in the figure and are only represented by Arabic numerals).

[0030] The first rectifier and filter circuit includes a first diode D1 and a first capacitor C1. The anode end of the first diode D1 is connected to Pin1, the cathode end of the first diode D1 is connected to one end of the first capacitor C1, and the other end of the first capacitor C1 is connected to Pin2. The first diode D1 has a rectifying effect, and the first capacitor C1 has a filtering and energy storage effect. The output voltage network of the first rectifier and filter circuit is labeled +12V_LV, GND1.

[0031] Since there are three secondary second windings, each secondary second winding is connected to a second rectifier and filter circuit, that is, secondary second winding one is connected to second rectifier and filter circuit one, secondary second winding two is connected to second rectifier and filter circuit two, and secondary second winding three is connected to second rectifier and filter circuit three.

[0032] The second rectifier and filter circuit includes a second rectifier diode D2 and a fourth capacitor C4. The anode end of the second rectifier diode D2 is connected to Pin18, the cathode end of the second rectifier diode D2 is connected to one end of the fourth capacitor C4, and the other end of the fourth capacitor C4 is connected to Pin16. The second rectifier diode D2 plays a rectifying role, and the fourth capacitor C4 plays a filtering and energy storage role.

[0033] The second rectifier and filter circuit 2 includes a fourth rectifier diode D4 and a ninth capacitor C9. The anode end of the fourth rectifier diode D4 is connected to Pin15, the cathode end of the fourth rectifier diode D4 is connected to one end of the ninth capacitor C9, and the other end of the ninth capacitor C9 is connected to Pin13. The fourth rectifier diode D4 plays a rectifying role, and the ninth capacitor C9 plays a filtering and energy storage role.

[0034] The second rectifier and filter circuit three includes an eleventh capacitor C11 and a sixth rectifier diode D6. One end of the eleventh capacitor C11 is connected to Pin12, the other end of the eleventh capacitor C11 is connected to the anode end of the sixth rectifier diode D6, and the cathode end of the sixth rectifier diode D6 is connected to Pin10. The eleventh capacitor C11 plays a filtering and energy storage role, and the sixth rectifier diode D6 plays a rectifying role.

[0035] The power supply voltage-dividing part is connected to the output end of the main power part, and separates the output power of the main power part into positive voltage and negative voltage. The power supply voltage-dividing part includes a voltage-dividing resistor, a voltage-stabilizing diode, and two filter capacitors. One end of the voltage-dividing resistor is connected to the positive output end of the main power part, the other end of the voltage-dividing resistor is connected to the cathode end of the voltage-stabilizing diode, the anode end of the voltage-stabilizing diode is connected to the negative output end of the main power part, and one end of the two filter capacitors is connected, the other end of one of the filter capacitors is connected to the positive output end of the main power part and serves as a positive voltage supply end, and the other end of the other filter capacitor is connected to the negative output end of the main power part and serves as a negative voltage supply end. After one end of the voltage-dividing resistor is connected to one end of the two filter capacitors, one end of the two filter capacitors serves as a lower ground connection end.

[0036] Since there are three secondary second windings, each secondary second winding is connected to a second rectifier and filter circuit. Therefore, there are three power supply voltage divider parts. The output end of the second rectifier and filter circuit one is connected to the power supply voltage divider part one, the output end of the second rectifier and filter circuit two is connected to the power supply voltage divider part two, and the output end of the second rectifier and filter circuit three is connected to the power supply voltage divider part three.

[0037] The power supply voltage dividing part 1 includes a second voltage dividing resistor R2, a second voltage zener diode ZD2, a second filter capacitor C2, and a fifth filter capacitor C5. One end of the second voltage dividing resistor R2 is connected to one end of the fourth capacitor C4, the other end of the second voltage dividing resistor R2 is connected to the cathode end of the second voltage zener diode ZD2, the anode end of the second voltage zener diode ZD2 is connected to the other end of the fourth capacitor C4, one end of the second filter capacitor C2 is connected to one end of the fifth filter capacitor C5, the other end of the second filter capacitor C2 is connected to one end of the fourth capacitor C4 and serves as the positive voltage power supply end (P15V_WL) of the W phase, the other end of the fifth filter capacitor C5 is connected to the other end of the fourth capacitor C4 and serves as the negative voltage power supply end (P-5V_WL) of the W phase, and after one end of the second voltage dividing resistor R2 is connected to one end of the second filter capacitor C2 and the fifth filter capacitor C5, one end of the second filter capacitor C2 and the fifth filter capacitor C5 serves as the ground connection end (GND_WL) of the W phase.

[0038] The second power supply voltage dividing part includes a fourth voltage dividing resistor R4, a third voltage zener diode ZD3, a seventh filter capacitor C7, and an eighth filter capacitor C8. One end of the fourth voltage dividing resistor R4 is connected to one end of the ninth capacitor C9, the other end of the fourth voltage dividing resistor R4 is connected to the cathode end of the third voltage zener diode ZD3, the anode end of the third voltage zener diode ZD3 is connected to the other end of the ninth capacitor C9, one end of the seventh filter capacitor C7 is connected to one end of the eighth filter capacitor C8, the other end of the seventh filter capacitor C7 is connected to one end of the ninth capacitor C9 and serves as the positive voltage power supply end (P15V_VL) of the V phase, the other end of the eighth filter capacitor C8 is connected to the other end of the ninth capacitor C9 and serves as the negative voltage power supply end (P-5V_VL) of the V phase, and after one end of the fourth voltage dividing resistor R4 is connected to one end of the seventh filter capacitor C7 and the eighth filter capacitor C8, one end of the seventh filter capacitor C7 and the eighth filter capacitor C8 serves as the ground connection end (GND_VL) of the V phase.

[0039] The power supply voltage dividing part three includes a fifth voltage dividing resistor R5, a fourth voltage zener diode ZD4, a tenth filter capacitor C10, and a thirteenth filter capacitor C13. One end of the fifth voltage dividing resistor R5 is connected to one end of the eleventh capacitor C11, the other end of the fifth voltage dividing resistor R5 is connected to the cathode end of the fourth voltage zener diode ZD4, the anode end of the fourth voltage zener diode ZD4 is connected to the other end of the eleventh capacitor C11, one end of the tenth filter capacitor C10 is connected to one end of the thirteenth filter capacitor C13, and the tenth filter capacitor C10 is connected to one end of the thirteenth filter capacitor C13. The other end of the fifth voltage-dividing resistor R5 is connected to one end of the tenth filter capacitor C10 and the thirteenth filter capacitor C13, and one end of the tenth filter capacitor C10 and the thirteenth filter capacitor C13 is used as the ground connection terminal (GND_UL) of the U phase.

[0040] The control part controls the output voltage, and is connected to the main power part and the power supply voltage dividing part. The control part includes an isolation chip U1, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a fourteenth capacitor C14, and a fifteenth capacitor C15. The isolation chip U1 has a built-in power MOS tube, and the control end of the isolation chip U1 is internally isolated from the power MOS end. One end of the sixth resistor R6 is connected to the positive output end of the main power part, the sixth resistor R6 is connected to the output end of the second rectifier circuit of the main power part, one end of the sixth resistor R6 is connected to one end of the eleventh capacitor C11, the other end of the sixth resistor R6 is respectively connected to one end of the eighth resistor R8 and the fourteenth capacitor C14, the other ends of the eighth resistor R8, the fourteenth capacitor C14 and one end of the fifteenth capacitor C15 are all connected to the ground pin of the isolation chip U1, the other end of the fifteenth capacitor C15 is connected to the isolation chip U1, one end of the seventh resistor R7 is connected to the negative output end of the main power part, one end of the seventh resistor R7 is connected to Pin10 of the secondary second winding three of the main power part, and the other end of the seventh resistor R7 is connected to the isolation chip U1.

[0041] The voltage sampling circuit adopts the secondary side feedback mode. The output power of the output end of the second rectifier filter circuit 3 is sent to the isolation chip U1 through the feedback circuit (the feedback circuit is composed of the sixth resistor R6, the eighth resistor R8, the fourteenth capacitor C14, and the fifteenth capacitor C15). The feedback pin voltage of the isolation chip U1 is 1.26V, and the sampling voltage ratio relationship is:

[0042]

[0043] The LDO circuit module includes an LDO chip U2, a seventeenth capacitor C17, an eighteenth capacitor C18, and a nineteenth capacitor C19. The power pin of the LDO chip U2 and one end of the seventeenth capacitor C17 are connected to the output end of the main power part. In this embodiment, the power pin of the LDO chip U2 and one end of the seventeenth capacitor C17 are connected to the voltage network labeled +12V_LV. One end of the eighteenth capacitor C18 and the nineteenth capacitor C19 are connected to the output pin of the LDO chip U2, and the other ends of the seventeenth capacitor C17, the eighteenth capacitor C18, and the nineteenth capacitor C19 are connected to the ground pin of the LDO chip U2. The output power network of the LDO circuit module is labeled P5V_VL and GND_LV.

[0044] The LDO circuit module is connected to the ASC logic judgment circuit, the ASC logic judgment circuit is connected to the IGBT driver chip, and the ASC logic judgment circuit generates an ASC enable signal to enable the IGBT driver chip to enter the ASC (active short circuit) mode; the ASC logic judgment circuit is composed of an AND gate and a NOT gate chip connected, and its chip power supply is provided by the LDO circuit module. The generated ASC enable signal includes an upper bridge ASC enable signal and a lower bridge ASC enable signal, which can control the upper bridge arm or lower bridge arm of the IGBT driver chip to enter the ASC mode.

[0045] The IGBT driver chip includes a lower bridge arm, the lower bridge arm has a low-voltage side power supply and a high-voltage side power supply, the low-voltage side power supply of the lower bridge arm is connected to the output end of the first rectifier filter circuit, and the high-voltage side power supply of the lower bridge arm is connected to the power supply voltage divider part. The three-phase power input end of the IGBT driver chip is respectively connected to the power supply voltage divider part 1, the power supply voltage divider part 2, and the power supply voltage divider part 3. The IGBT driver chip also includes an upper bridge arm, which is provided by a low-voltage battery, such as a 16V battery. The IGBT driver chip consists of 6 bridge arms of the upper and lower bridges of the U, V, and W phases, which are responsible for receiving the switch tube signal of the MCU (the MCU is not shown in the figure) and the ASC enable signal, and performing the IGBT switch tube operation. The structure of the IGBT driver chip is a conventional structure and is not repeated here.

[0046] The above embodiments are part of the embodiments of the present invention. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but cannot be simply understood as limiting the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

Claims

1. An IGBT drive system for a new energy electric vehicle, characterized in that: It includes a high-voltage flyback power supply module, an LDO circuit module, an ASC logic judgment circuit, and an IGBT drive circuit module. The high-voltage flyback power supply module takes power from the high-voltage battery pack of the whole vehicle, and supplies power to the LDO circuit module and the IGBT drive chip after level conversion of the high-voltage power; the LDO circuit module is connected to the ASC logic judgment circuit; the ASC logic judgment circuit is connected to the IGBT drive chip, and the ASC logic judgment circuit generates an ASC enable signal to enable the IGBT drive chip to enter the ASC mode; The high-voltage flyback power supply module comprises: The main power part converts the high voltage into a level; the output end of the main power part is connected to the LDO circuit module; A power voltage divider connected to the output end of the main power part separates the output power of the main power part into positive voltage and negative voltage; The control part controls the output voltage, and the control part is connected to the main power part and the power supply voltage dividing part.

2. The IGBT drive system of a new energy electric vehicle according to claim 1, characterized in that: The main power part comprises a flyback transformer (T1), an RCD absorption circuit, and a rectifier filter circuit. The flyback transformer (T1) comprises a primary main winding, a primary secondary winding, a secondary first winding, a plurality of secondary second windings, a first rectifier filter circuit, and a second rectifier filter circuit. The primary main winding is connected to the RCD absorption circuit, the primary secondary winding is connected to the rectifier filter circuit, the secondary first winding is connected to the first rectifier filter circuit, and each secondary second winding is connected to a second rectifier filter circuit.

3. The IGBT drive system of a new energy electric vehicle according to claim 2, characterized in that: The RCD absorption circuit comprises a first resistor (R1), a third resistor (R3), a third capacitor (C3), a third rectifier diode (D3), a TVS diode (ZD1), and a third capacitor (C3); one end of the first resistor (R1) and one end of the third capacitor (C3) are respectively used to connect to a high-voltage battery pack of a vehicle; the other end of the first resistor (R1) is connected to an anode end of the TVS diode (ZD1); the cathode end of the TVS diode (ZD1) and the other end of the third capacitor (C3) are respectively connected to one end of the third resistor (R3); the other end of the third resistor (R3) is connected to a cathode end of the third rectifier diode (D3); and the anode end of the third rectifier diode (D3) is connected to a primary main winding of a flyback transformer (T1).

4. The IGBT drive system of a new energy electric vehicle according to claim 2, characterized in that: The rectifier and filter circuit comprises a twelfth capacitor (C12), a sixteenth capacitor (C16), a ninth resistor (R9), and a fifth rectifier diode (D5); one end of the twelfth capacitor (C12) is connected to the cathode end of the fifth rectifier diode (D5); the anode end of the fifth rectifier diode (D5) is connected to the primary secondary winding of the flyback transformer (T1); one end of the sixteenth capacitor (C16) and the ninth resistor (R9) are respectively connected to the control part; the other end of the sixteenth capacitor (C16) is connected to the other end of the twelfth capacitor (C12); and the other end of the ninth resistor (R9) is connected to the cathode end of the fifth rectifier diode (D5).

5. The IGBT drive system of a new energy electric vehicle according to claim 1, characterized in that: The power supply voltage-dividing part includes a voltage-dividing resistor, a voltage-stabilizing diode, and two filter capacitors. One end of the voltage-dividing resistor is connected to the positive output end of the main power part, the other end of the voltage-dividing resistor is connected to the cathode end of the voltage-stabilizing diode, the anode end of the voltage-stabilizing diode is connected to the negative output end of the main power part, and one end of the two filter capacitors is connected, the other end of one of the filter capacitors is connected to the positive output end of the main power part and serves as a positive voltage power supply end, and the other end of the other filter capacitor is connected to the negative output end of the main power part and serves as a negative voltage power supply end. After one end of the voltage-dividing resistor is connected to one end of the two filter capacitors, one end of the two filter capacitors serves as a ground connection end.

6. The IGBT drive system of a new energy electric vehicle according to claim 1, characterized in that: The control part comprises an isolation chip (U1), a sixth resistor (R6), a seventh resistor (R7), an eighth resistor (R8), a fourteenth capacitor (C14), and a fifteenth capacitor (C15); one end of the sixth resistor (R6) is connected to the positive output end of the main power part; the other end of the sixth resistor (R6) is respectively connected to the eighth resistor (R8) and one end of the fourteenth capacitor (C14); the other ends of the eighth resistor (R8), the fourteenth capacitor (C14), and one end of the fifteenth capacitor (C15) are all connected to the ground pin of the isolation chip (U1); the other end of the fifteenth capacitor (C15) is connected to the isolation chip (U1); one end of the seventh resistor (R7) is connected to the negative output end of the main power part; and the other end of the seventh resistor (R7) is connected to the isolation chip (U1).

7. The IGBT drive system of a new energy electric vehicle according to claim 1, characterized in that: The LDO circuit module comprises an LDO chip (U2), a seventeenth capacitor (C17), an eighteenth capacitor (C18), and a nineteenth capacitor (C19); a power pin of the LDO chip (U2) and one end of the seventeenth capacitor (C17) are connected to the output end of the main power part; one end of the eighteenth capacitor (C18) and the nineteenth capacitor (C19) are connected to the output pin of the LDO chip (U2); and the other ends of the seventeenth capacitor (C17), the eighteenth capacitor (C18), and the nineteenth capacitor (C19) are connected to the ground pin of the LDO chip (U2).

8. The IGBT drive system of a new energy electric vehicle according to claim 2, characterized in that: The IGBT driver chip includes a lower bridge arm, which has a low-voltage side power supply and a high-voltage side power supply. The low-voltage side power supply of the lower bridge arm is connected to the output end of the first rectifier and filter circuit, and the high-voltage side power supply of the lower bridge arm is connected to the power supply voltage divider.

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