CN217545572U - Active short circuit control circuit - Google Patents
Active short circuit control circuit Download PDFInfo
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- CN217545572U CN217545572U CN202220502628.1U CN202220502628U CN217545572U CN 217545572 U CN217545572 U CN 217545572U CN 202220502628 U CN202220502628 U CN 202220502628U CN 217545572 U CN217545572 U CN 217545572U
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Abstract
The utility model discloses an initiative short-circuit control circuit, this circuit includes: the voltage comparison circuit receives the real-time voltage value of the bus power supply, judges whether active short-circuit protection needs to be executed or not according to the received voltage value and sends an active short-circuit protection control instruction; the voltage detection circuit is connected with the voltage comparison circuit, detects the real-time voltage value of the bus power supply and sends the detected voltage value to the voltage comparison circuit; the three-phase driving module is connected with the voltage comparison circuit and receives an active short-circuit protection control instruction sent from the voltage comparison circuit; and the three-phase IGBT module is connected with the three-phase driving module, and enables the three phases of the motor to be short-circuited to the negative end or the positive end of the bus according to the control instruction of the three-phase driving module, so that active short-circuit protection is realized. The utility model discloses as long as highly compressed power is normal, can independently carry out initiative short-circuit protection, the circuit is simple reliable, and the hardware is with low costs, has improved the reliability and the security of system greatly.
Description
[ technical field ] A method for producing a semiconductor device
The utility model relates to a new energy automobile control field, in particular to reliability is high, simple structure's initiative short circuit control circuit.
[ background of the invention ]
In a new energy automobile, active short circuit control (ASC) is to short-circuit a three-phase line of a power motor to a negative end or a positive end of a dc bus (but generally short-circuit the negative end of the dc bus) to prevent an excessively high back electromotive force of the motor from damaging a control module and a bus capacitor of a controller. The conventional active short-circuit protection scheme mainly has two types: one scheme is realized by a main control MCU and software on the low-voltage side. In the scheme, when the MCU detects overvoltage and other errors in a system, software judges whether the MCU needs to execute ASC protection or not, and the scheme is characterized in that the cost is low, the control is flexible, but the protection capability is lost in certain failure modes, for example, the software and the main control MCU lose control or the controller loses the ASC protection capability when a low-voltage side power supply fails, so the reliability is low, and the method is only suitable for application which is very sensitive to the cost. The other scheme is that an auxiliary MCU is added on the high-voltage side, software can directly execute ASC through a main control MCU, and also can execute ASC protection through the auxiliary MCU through SPI communication. In the scheme, when the main control MCU is out of control or the power supply on the lower side is in fault, the MCU on the high-voltage side can independently execute ASC protection after monitoring certain error states. However, since the MCU and other circuits are added to the high voltage side, the complexity and hardware cost of the circuit are greatly increased.
[ summary of the invention ]
The utility model aims at solving the above problems, and provides an initiative short-circuit control circuit with low costs, high and simple structure of security.
In order to realize the utility model discloses a purpose, the utility model provides an initiative short-circuit control circuit, this circuit includes:
the voltage comparison circuit receives the real-time voltage value of the bus power supply, judges whether active short-circuit protection needs to be executed or not according to the received voltage value and sends an active short-circuit protection control instruction;
the voltage detection circuit is connected with the voltage comparison circuit, detects the real-time voltage value of the bus power supply and sends the detected voltage value to the voltage comparison circuit;
the three-phase driving module is connected with the voltage comparison circuit and receives an active short-circuit protection control instruction sent from the voltage comparison circuit;
the three-phase IGBT module is connected with the three-phase driving module and enables the three phases of the motor to be short-circuited to the negative end or the positive end of the bus according to the control instruction of the three-phase driving module, so that active short-circuit protection is realized;
and the main control unit is respectively connected with the voltage detection circuit and the three-phase driving module, receives the voltage value sent from the voltage detection circuit, judges whether active short-circuit protection needs to be executed according to the received voltage value, and sends an active short-circuit protection control instruction to the three-phase driving module.
The voltage comparison circuit comprises a first chip U1, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a first diode D1 and a second capacitor C2, wherein a first pin of the first chip U1 is respectively connected with one end of a second pin and one end of the eighth resistor R8, a third pin of the first chip U1 is connected with the voltage detection circuit, a fifth pin of the first chip U1 is respectively connected with the other end of the eighth resistor R8 and one end of the ninth resistor R9, a sixth pin of the first chip U1 is connected with a reference voltage through the seventh resistor R7, a seventh pin of the first chip U1 is respectively connected with an anode of the first diode D1 and the three-phase driving module, an eighth pin of the first chip U1 is respectively connected with one end of the second capacitor C2 and a power supply, a fourth pin of the first chip U1 and the other end of the second capacitor C2 are grounded, and the other end of the ninth resistor R9 is connected with a cathode of the first diode D1.
Further, the first chip U1 is a voltage comparator of type TLV 3702.
The voltage detection circuit comprises a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6 and a first capacitor C1, wherein the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4 and the fifth resistor R5 are sequentially connected in series, one end of the sixth resistor R6 is connected with one ends of the fifth resistor R5 and the first capacitor C1 respectively, and the other end of the sixth resistor R6 and the other end of the first capacitor C1 are grounded respectively.
The three-phase driving module comprises a U-phase driving module, a V-phase driving module and a W-phase driving module.
The main control unit comprises a processing module, a pulse width modulation module and an analog-to-digital conversion module, the analog-to-digital conversion module converts a voltage value sent by the voltage detection circuit into a digital signal, and the processing module judges whether active short-circuit protection needs to be executed or not and sends an active short-circuit protection control instruction to the three-phase driving module through the pulse width modulation module.
An analog isolation unit is arranged between the analog-to-digital conversion module and the voltage detection circuit.
The utility model discloses a contribution lies in, the utility model discloses a voltage comparison circuit carries out the comparison through the magnitude of voltage with the voltage detection circuit detection with reference voltage, judges whether need carry out initiative short-circuit protection, if needs, then sends initiative short-circuit protection control command to three-phase drive module, makes the three-phase of motor to the negative terminal or the positive end short circuit of generating line through three-phase IGBT module again, realizes initiative short-circuit protection. The utility model discloses can break away from the main control unit, as long as highly compressed power is normal, can independently carry out initiative short-circuit protection, the circuit is simple reliable, and the hardware is with low costs, has improved the reliability and the security of system greatly.
[ description of the drawings ]
Fig. 1 is a block diagram of the present invention.
Fig. 2 is a circuit diagram of the present invention.
[ detailed description ] embodiments
The following examples are further illustrative and supplementary to the present invention and do not constitute any limitation to the present invention.
Referring to fig. 1, the active short circuit control circuit of the present invention includes a voltage comparison circuit 10, a voltage detection circuit 20, a three-phase driving module 30 and a three-phase IGBT module 40. The voltage comparison circuit 10 is connected to the voltage detection circuit 20 and the three-phase driving module 30, respectively. The active short-circuit control circuit is used for a new energy automobile motor controller, solves the problems of low cost and safety of new energy automobile ASC control, effectively reduces the hardware cost of the controller, improves the safety of the whole automobile, and reduces the design difficulty of hardware circuits and software. The motor controller is particularly suitable for protecting the controller of the new energy automobile when the master control circuit is in a complete out-of-control state, such as master control chip failure or low-voltage side power supply failure, and the like, and the reliability of the motor controller of the new energy automobile is improved.
As shown in fig. 1, the voltage comparison circuit 10 is configured to receive a real-time voltage value of the bus power supply, and determine whether to execute active short-circuit protection and send an active short-circuit protection control command according to the received voltage value. In this embodiment, the voltage comparison circuit 10 receives the real-time voltage value detected by the voltage detection circuit 20, compares the received voltage value with a preset voltage value, and determines whether active short-circuit protection needs to be executed, if the received voltage value exceeds the preset value, the voltage comparison circuit 10 determines that active short-circuit protection needs to be executed, and sends an active short-circuit protection control instruction to the three-phase driving module 30; if the received voltage value is within the predetermined voltage value range, the voltage comparison circuit 10 determines that the active short-circuit protection is not required.
Specifically, as shown in fig. 1 and 2, the voltage comparison circuit 10 includes a first chip U1, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a first diode D1 and a second capacitor C2, wherein a first pin of the first chip U1 is connected to one end of a second pin and one end of the eighth resistor R8, a third pin of the first chip U1 is connected to the voltage detection circuit 20, a fifth pin of the first chip U is connected to the other end of the eighth resistor R8 and one end of the ninth resistor R9, a sixth pin of the first chip U1 is connected to the reference voltage through the seventh resistor R7, a seventh pin of the first chip U is connected to the anode of the first diode D1 and the three-phase driving module 30, an eighth pin of the first chip U1 is connected to one end of the second capacitor C2 and the power supply, a fourth pin of the first chip U1 and the other end of the second capacitor C2 are grounded, and the other end of the ninth resistor R9 is connected to the cathode of the first diode D1. In this embodiment, the first chip U1 is a voltage comparator of type TLV3702, the reference voltage is 5V, and the power supply voltage is 15V.
As shown in fig. 1, the voltage detection circuit 20 is connected to the voltage comparison circuit 10, detects a real-time voltage value of the bus power supply, and transmits the detected voltage value to the voltage comparison circuit 10. Specifically, as shown in fig. 2, the voltage detection circuit 20 includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, and a first capacitor C1, wherein the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, and the fifth resistor R5 are sequentially connected in series, one end of the sixth resistor R6 is connected to one end of the fifth resistor R5 and one end of the first capacitor C1, and the other end of the sixth resistor R6 and the other end of the first capacitor C1 are grounded, respectively. In this embodiment, the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, the fifth resistor R5, and the sixth resistor R6 are voltage dividing circuits that divide the bus voltage. The first capacitor C1 is a filter capacitor, and is used for filtering interference of a high-frequency signal of the bus voltage.
As shown in fig. 1 and 2, the three-phase driving module 30 is connected to the voltage comparison circuit 10, and receives a main control short-circuit protection control command sent by the voltage comparison circuit 10, and drives the three-phase IGBT module 40. Specifically, the three-phase driving module 30 includes a U-phase driving module, a V-phase driving module, and a W-phase driving module. In this embodiment, the model of the driving chip of the three-phase driving module 30 is 1EDI3021AS. The three-phase IGBT module 40 is connected to the three-phase driving module 30, and it causes the three phases of the motor to short-circuit the negative end or the positive end of the bus according to the control instruction of the three-phase driving module 30, thereby implementing active short-circuit protection.
As shown in fig. 1 and fig. 2, the working principle of the present invention is: the voltage detection circuit 20 detects the voltage value of the bus power supply in real time, the first resistor R1 to the sixth resistor R6 in the voltage detection circuit 20 divide the bus voltage, the first capacitor C1 filters the divided voltage, interference of high-frequency signals of the bus voltage is filtered, and the filtered voltage is sent to the voltage comparison circuit 10. The first chip U1, the seventh resistor R7, the eighth resistor R8, the ninth resistor R9, and the first diode D1 constitute a hysteresis voltage comparator, and when the voltage of the fifth pin of the first chip U1 is greater than the voltage of the sixth pin, that is, the divided voltage is greater than the reference voltage, the seventh pin of the first chip U1 outputs a high level signal to the three-phase driving module 30, so as to achieve the purpose of ASC; when the voltage of the fifth pin of the first chip U1 is smaller than the voltage of the sixth pin, that is, the divided voltage is smaller than the reference voltage, the seventh pin of the first chip U1 outputs a low level, and at this time, the ASC control is cancelled.
In another embodiment, as shown in fig. 1 and fig. 2, the circuit further includes a main control unit 50, which is respectively connected to the voltage detection circuit 20 and the three-phase driving module 30, and the main control unit 50 controls the operation of the motor through the three-phase driving module 30 and the three-phase IGBT module 40. In addition, the main control unit 50 is further configured to receive the voltage value of the voltage detection circuit 20, and determine whether to execute the active short-circuit protection and send an active short-circuit protection control command according to the received voltage value. In this embodiment, the main control unit 50 receives the real-time voltage value detected by the voltage detection circuit 20, compares the received voltage value with a preset voltage value, and determines whether active short-circuit protection needs to be executed, and if the received voltage value exceeds the preset value, the main control unit 50 determines that active short-circuit protection needs to be executed, and sends an active short-circuit protection control instruction to the three-phase driving module 30; if the received voltage value is within the predetermined voltage value range, the main control unit 50 determines that the active short-circuit protection is not required.
Specifically, as shown in fig. 1 and fig. 2, the main control unit 50 includes a processing module, a pulse width modulation module, and an analog-to-digital conversion module, where the analog-to-digital conversion module converts the voltage value sent by the voltage detection circuit 20 into a digital signal, and the processing module determines whether active short-circuit protection needs to be executed, and sends an active short-circuit protection control instruction to the three-phase driving module 30 through the pulse width modulation module. In this embodiment, an analog isolation unit 60 is disposed between the analog-to-digital conversion module and the voltage detection circuit 20, and the analog isolation unit 60 is configured to isolate and output the voltage value detected by the voltage detection circuit 20 to the analog-to-digital conversion module of the main control unit 50.
As shown in fig. 1 and fig. 2, the working principle of the present embodiment is as follows: when the main control unit 50 detects overcurrent, overvoltage and other error conditions, the main control unit 50 determines whether active short circuit protection is required. The voltage detection circuit 20 detects the voltage value of the bus power supply in real time, the first resistor R1 to the sixth resistor R6 in the voltage detection circuit 20 divide the bus voltage, the first capacitor C1 filters the divided voltage, interference of high-frequency signals of the bus voltage is filtered, and the filtered voltage is sent to the main control unit 50 through the analog isolation unit 60. The main control unit 50 compares the divided voltage with a preset value, and if the divided voltage is greater than the preset value, the main control unit 50 sends a PWM signal to the three-phase driving module 30 and controls the three lower or upper bridge arms of the three-phase IGBT module 40 to short-circuit the three phases of the motor to the negative or positive end of the bus, thereby achieving the ASC purpose.
The utility model discloses an initiative short-circuit protection circuit can break away from main control unit 50, and as long as highly compressed power is normal, just can rely on voltage comparison circuit 10 independent execution ASC protection, and the circuit is simple reliable, and the hardware is with low costs, and has improved the reliability and the security of system greatly. Under normal conditions, the main control unit 50 and the voltage comparison circuit 10 can simultaneously perform ASC protection, thereby further improving the reliability and safety of the system.
Although the present invention has been described in connection with the above embodiments, the scope of the present invention is not limited thereto, and modifications, replacements, and the like to the above members are all within the scope of the claims of the present invention without departing from the concept of the present invention.
Claims (7)
1. An active short control circuit, comprising:
the voltage comparison circuit (10) receives a real-time voltage value of the bus power supply, judges whether active short-circuit protection needs to be executed or not according to the received voltage value, and sends an active short-circuit protection control instruction;
a voltage detection circuit (20) which is connected with the voltage comparison circuit (10), detects the real-time voltage value of the bus power supply and sends the detected voltage value to the voltage comparison circuit (10);
the three-phase driving module (30) is connected with the voltage comparison circuit (10) and receives an active short-circuit protection control instruction sent from the voltage comparison circuit (10);
a three-phase IGBT module (40) which is connected with the three-phase driving module (30) and enables the negative end or the positive end of the three phases of the motor to be short-circuited to the bus according to the control instruction of the three-phase driving module (30) to realize active short-circuit protection,
and the main control unit (50) is respectively connected with the voltage detection circuit (20) and the three-phase driving module (30), receives the voltage value sent from the voltage detection circuit (20), judges whether active short-circuit protection needs to be executed or not according to the received voltage value, and sends an active short-circuit protection control instruction to the three-phase driving module (30).
2. The active short circuit control circuit as claimed in claim 1, wherein the voltage comparison circuit (10) comprises a first chip U1, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a first diode D1 and a second capacitor C2, the first pin of the first chip U1 is connected to one end of the second pin and one end of the eighth resistor R8, respectively, the third pin thereof is connected to the voltage detection circuit (20), the fifth pin thereof is connected to the other end of the eighth resistor R8 and one end of the ninth resistor R9, the sixth pin thereof is connected to the reference voltage via the seventh resistor R7, the seventh pin thereof is connected to the anode of the first diode D1 and the three-phase driving module (30), the eighth pin thereof is connected to one end of the second capacitor C2 and the power supply, the fourth pin of the first chip U1 and the other end of the second capacitor C2 are grounded, and the other end of the ninth resistor R9 is connected to the cathode of the first diode D1.
3. The active short-circuit control circuit as claimed in claim 2, wherein the first chip U1 is a voltage comparator of type TLV 3702.
4. The active short-circuit control circuit according to claim 1, wherein the voltage detection circuit (20) comprises a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6 and a first capacitor C1, the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4 and the fifth resistor R5 are sequentially connected in series, one end of the sixth resistor R6 is connected to one end of the fifth resistor R5 and one end of the first capacitor C1, and the other end of the sixth resistor R6 and the other end of the first capacitor C1 are respectively connected to ground.
5. The active short-circuit control circuit according to claim 1, wherein the three-phase driving module (30) comprises a U-phase driving module, a V-phase driving module and a W-phase driving module.
6. The active short-circuit control circuit according to claim 1, wherein the main control unit (50) comprises a processing module, a pulse width modulation module and an analog-to-digital conversion module, the analog-to-digital conversion module converts the voltage value sent by the voltage detection circuit (20) into a digital signal, the processing module determines whether active short-circuit protection needs to be executed, and sends an active short-circuit protection control command to the three-phase driving module (30) through the pulse width modulation module.
7. The active short-circuit control circuit according to claim 6, characterized in that an analog isolation unit (60) is provided between the analog-to-digital conversion module and the voltage detection circuit (20).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220502628.1U CN217545572U (en) | 2022-03-08 | 2022-03-08 | Active short circuit control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220502628.1U CN217545572U (en) | 2022-03-08 | 2022-03-08 | Active short circuit control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217545572U true CN217545572U (en) | 2022-10-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220502628.1U Active CN217545572U (en) | 2022-03-08 | 2022-03-08 | Active short circuit control circuit |
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| Country | Link |
|---|---|
| CN (1) | CN217545572U (en) |
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- 2022-03-08 CN CN202220502628.1U patent/CN217545572U/en active Active
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