CN113400941B - Active short-circuit signal processing circuit and vehicle - Google Patents
Active short-circuit signal processing circuit and vehicle Download PDFInfo
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- CN113400941B CN113400941B CN202110702518.XA CN202110702518A CN113400941B CN 113400941 B CN113400941 B CN 113400941B CN 202110702518 A CN202110702518 A CN 202110702518A CN 113400941 B CN113400941 B CN 113400941B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/72—Electric energy management in electromobility
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Abstract
The invention discloses an active short-circuit signal processing circuit and a vehicle. Wherein, this initiative short-circuit signal processing circuit includes: the circuit comprises an optical coupling driving circuit, a high-low voltage isolation circuit, a filter circuit, a diagnosis circuit and a driving circuit. The input end of the optical coupling driving circuit is connected with an active short-circuit signal output by a low-voltage domain, the input end of the high-low voltage isolation circuit is connected with the output end of the optical coupling driving circuit, the input end of the filter circuit is connected with the output end of the high-low voltage isolation circuit, the input end of the diagnosis circuit is connected with the output end of the filter circuit, the input end of the driving circuit is connected with the output end of the diagnosis circuit, and the output end of the driving circuit is connected with the bridge driving chip and used for outputting a driving signal corresponding to a control signal output by the diagnosis circuit. According to the invention, through the hardware circuit built by the external discrete device and the optical coupler, a reliable control signal can still be effectively output under the condition of low-voltage domain work abnormity (including power supply abnormity), and an active short circuit function is realized.
Description
Technical Field
The embodiment of the invention relates to a new energy automobile power motor braking technology, in particular to an active short-circuit signal processing circuit and an automobile.
Background
The function of the electric drive controller of the new energy electric vehicle is to convert the direct current of the power battery into three-phase alternating current by controlling the switch of an Insulated Gate Bipolar Transistor (IGBT), so as to drive the permanent magnet synchronous motor to output controllable rotating speed and torque and drive the vehicle to run. The power motor is a power source of the new energy automobile, and the motor can seriously affect the life safety of people in an out-of-control state. The active short circuit function is a control mode for maintaining the safety state of the motor when the motor has a low-voltage fault. The three-phase lower bridge of the IGBT can be opened and the three-phase upper bridge of the IGBT can be turned off when the whole vehicle is out of control. The three-phase voltage is short-circuited, and according to the inherent characteristics of the permanent magnet synchronous motor, reverse torque is generated during the three-phase short-circuiting, and the whole vehicle is slowly braked.
The common active short circuit function is that a controller sends out a control signal to be connected with the low-voltage domain side of the IGBT driving chip, and the IGBT driving chip controls the on and off of the IGBT in an abnormal state. The scheme can meet the functional requirement of active short circuit to a certain extent. However, if the low-voltage domain of the IGBT driver chip is out of control (e.g., the low-voltage power supply is abnormal), it cannot be guaranteed that the high side of the IGBT driver chip can control the IGBT to operate in an expected state, and the IGBT driver chip cannot output a reliable control signal, and cannot realize an active short circuit function.
Disclosure of Invention
The invention provides an active short-circuit signal processing circuit and a vehicle, which can still effectively output reliable control signals under the condition of abnormal operation of a low-voltage domain, and realize an active short-circuit function.
In a first aspect, an embodiment of the present invention provides an active short-circuit signal processing circuit, including:
the system comprises an optical coupling driving circuit, a high-low voltage isolation circuit, a filter circuit, a diagnosis circuit and a driving circuit;
the optical coupler driving circuit comprises an input end, an output end and a power supply end, wherein the input end of the optical coupler driving circuit is connected with an active short circuit signal output by a low-voltage domain, and the power supply end of the optical coupler driving circuit is connected with a low-voltage domain logic power supply voltage;
the high-low voltage isolation circuit comprises an input end, an output end and a power supply end, the input end of the high-low voltage isolation circuit is connected with the output end of the optocoupler drive circuit, the power supply end of the high-low voltage isolation circuit is connected with a high-voltage domain logic power supply voltage, and the high-low voltage isolation circuit is used for carrying out isolation transmission on signals at the input end;
the filter circuit comprises an input end and an output end, and the input end of the filter circuit is connected with the output end of the high-low voltage isolation circuit;
the diagnostic circuit comprises an input end and an output end, the input end of the diagnostic circuit is connected with the output end of the filter circuit, and the diagnostic circuit is used for determining whether the low-voltage domain works normally or not according to a signal input by the input end of the diagnostic circuit and outputting a control signal corresponding to the normal or abnormal work of the low-voltage domain;
the drive circuit comprises an input end and an output end, the input end of the drive circuit is connected with the output end of the diagnosis circuit, and the output end of the drive circuit is connected with the bridge drive chip and used for outputting a drive signal corresponding to the control signal output by the diagnosis circuit.
Optionally, the optocoupler driving circuit includes a first resistor, a second resistor, a third resistor, a first capacitor, and a first MOS transistor;
the first resistor is connected between the input end of the optocoupler driving circuit and the grid electrode of the first MOS tube;
the second resistor is connected between the grid electrode and the first electrode of the first MOS tube;
a first pole of the first capacitor is connected with a first end of the first resistor, and a second pole of the first capacitor is connected with a first ground end;
the first pole of the first MOS tube is connected with the first ground end, the second pole of the first MOS tube is connected with the output end of the optical coupler driving circuit, and the output end of the optical coupler driving circuit is connected with the power supply end of the optical coupler driving circuit through the third resistor.
Optionally, the high-voltage and low-voltage isolation circuit includes a second capacitor, a third capacitor, a fourth resistor, and an optocoupler device:
the input end, the power supply input end and the output end of the optocoupler are respectively connected with the input end, the power supply end and the output end of the high-low voltage isolation circuit;
the second capacitor is connected between the input end of the optical coupler and the first ground end, the third capacitor is connected between the power input end of the optical coupler and the second ground end, and the fourth resistor is connected between the voltage input end and the output end of the optical coupler.
Optionally, the filter circuit includes a two-stage RC filter circuit.
Optionally, the filter circuit includes a fifth resistor, a sixth resistor, a fourth capacitor, and a fifth capacitor;
a first end of the fifth resistor is connected with the input end of the filter circuit, a second end of the fifth resistor is connected with a first end of the sixth resistor, and a second end of the sixth resistor is connected with the output end of the filter circuit;
the fourth capacitor is connected between the second end of the fifth resistor and the second ground, and the fifth capacitor is connected between the second end of the fifth resistor and the second ground.
Optionally, the diagnostic circuit includes a first voltage divider circuit, a second voltage divider circuit, a first comparator, a second comparator, and a seventh resistor;
the input end of the first voltage division circuit is connected with a high-voltage domain logic supply voltage, and the input end of the first voltage division circuit is connected with the first input end of the first comparator;
the second input end of the first comparator is connected with the input end of the diagnosis circuit, and the output end of the first comparator is connected with the output end of the diagnosis circuit;
the first input end of the second comparator is connected with the input end of the diagnosis circuit, and the output end of the second comparator is connected with the output end of the diagnosis circuit;
the input end of the second voltage division circuit is connected with a high-voltage domain logic power supply voltage, and the output end of the second voltage division circuit is connected with the second input end of the second comparator;
the first end of the seventh resistor is connected with the output ends of the first comparator and the second comparator, and the second end of the seventh resistor is connected with a high-voltage domain logic power supply voltage.
Optionally, the first voltage dividing circuit includes an eighth resistor and a ninth resistor, and the second voltage dividing circuit includes a tenth resistor and an eleventh resistor;
a first end of the eighth resistor is connected to a high-voltage domain logic power supply voltage, a second end of the eighth resistor is connected to an output end of the first voltage division circuit, a first end of the ninth resistor is connected to a second end of the eighth resistor, and a second end of the ninth resistor is connected to a second ground end;
a first end of the tenth resistor is connected to a high-voltage domain logic power supply voltage, a second end of the tenth resistor is connected to an output end of the second voltage division circuit, a first end of the eleventh resistor is connected to a second end of the tenth resistor, and a second end of the eleventh resistor is connected to a second ground end.
Optionally, the driving circuit includes a twelfth resistor, a thirteenth resistor, a fourteenth resistor, and a second MOS transistor;
the twelfth resistor is connected between the input end of the driving circuit and the grid electrode of the second MOS tube;
the thirteenth resistor is connected between the grid electrode and the first electrode of the second MOS tube;
a first end of the fourteenth resistor is connected to a high-voltage domain logic power supply voltage, and a second end of the fourteenth resistor is connected to a second pole of the second MOS transistor;
and the first pole of the second MOS tube is connected with a second ground end, and the second pole of the second MOS tube is connected with the output end of the driving circuit.
Optionally, during normal operation, the active short-circuit signal output by the low-voltage domain includes a PWM signal.
In a second aspect, an embodiment of the present invention further provides a vehicle, including the active short-circuit signal processing circuit described above.
According to the invention, through the hardware circuit built by the external discrete device and the optocoupler, a reliable control signal can still be effectively output under the condition of abnormal low-voltage domain work (including power supply abnormality), an active short circuit function is realized, the problem that the high side of the driving chip can not be ensured to control the IGBT to work in an expected state under the condition of out-of-control low-voltage domain of the IGBT driving chip (such as abnormal low-voltage power supply) is solved, and the reverse torque is provided for a vehicle to slow down the vehicle speed when the vehicle state is out of control, so that accidents are avoided to a certain extent, and the invention has important significance on the functional safety of a new energy electric vehicle.
Drawings
Fig. 1 is a schematic diagram of a functional module of an active short-circuit signal processing circuit according to an embodiment of the present invention;
fig. 2 is a schematic diagram of an optocoupler drive circuit according to a second embodiment of the present invention;
fig. 3 is a schematic diagram of a high-voltage and low-voltage isolation circuit according to a second embodiment of the invention;
fig. 4 is a schematic diagram of a filter circuit according to a second embodiment of the present invention;
FIG. 5 is a schematic diagram of a diagnostic circuit according to a second embodiment of the present invention;
fig. 6 is a schematic diagram of a driving circuit according to a second embodiment of the invention;
fig. 7 is a schematic diagram of a position of an active short-circuit signal processing circuit in a system according to a second embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
As mentioned in the background section, the prior art does not effectively implement the active short function. Aiming at the problem, the embodiment of the invention can still effectively output reliable control signals under the condition of abnormal operation (including power supply abnormality) of a low-voltage domain through the hardware circuit built by the external discrete device and the optocoupler, thereby realizing the active short-circuit function.
Example one
Fig. 1 is a schematic diagram of functional modules of an active short-circuit signal processing circuit according to an embodiment of the present invention, which is applicable to a normal or abnormal low-voltage domain, and referring to fig. 1, the active short-circuit signal processing circuit includes: the system comprises an optical coupler driving circuit 101, a high-low voltage isolation circuit 102, a filter circuit 103, a diagnosis circuit 104 and a driving circuit 105;
the optical coupling driving circuit 101 comprises an input end, an output end and a power supply end, wherein the input end of the optical coupling driving circuit 101 is connected with an active short circuit signal 201 output by a low-voltage domain, and the power supply end of the optical coupling driving circuit 101 is connected with a logic power supply voltage of the low-voltage domain;
the high-low voltage isolation circuit 102 comprises an input end, an output end and a power supply end, the input end of the high-low voltage isolation circuit 102 is connected with the output end of the optocoupler drive circuit 101, the power supply end of the high-low voltage isolation circuit 102 is connected with a high-voltage domain logic power supply voltage, and the high-low voltage isolation circuit 102 is used for carrying out isolation transmission on signals at the input end;
the filter circuit 103 comprises an input end and an output end, and the input end of the filter circuit 103 is connected with the output end of the high-low voltage isolation circuit 102;
the diagnostic circuit 104 comprises an input end and an output end, the input end of the diagnostic circuit 104 is connected with the output end of the filter circuit 103, and the diagnostic circuit 104 is used for determining whether the low-voltage domain works normally or not according to a signal input by the input end of the diagnostic circuit 104 and outputting a control signal corresponding to the normal or abnormal work of the low-voltage domain;
the driving circuit 105 includes an input end and an output end, the input end of the driving circuit 105 is connected to the output end of the diagnostic circuit 104, and the output end of the driving circuit 105 is connected to the bridge driving chip for outputting a driving signal corresponding to the control signal output by the diagnostic circuit 104.
The present embodiment provides the active short-circuit signal processing circuit functional module, and when the active short-circuit signal processing circuit is in normal operation, the active short-circuit signal output by the low voltage domain includes a PWM (Pulse Width Modulation) signal. Illustratively, an input end of the optocoupler drive circuit 101 is connected to an active short-circuit signal 201 output by a low-voltage domain, and the active short-circuit signal 201 is a signal sent by a low-voltage domain control module. When the low voltage domain works normally, the active short-circuit signal 201 is a PWM signal with a fixed frequency and a fixed duty ratio. When the low voltage domain works abnormally, the active short-circuit signal 201 is a high-level or low-level dc signal. The PWM signal representing normal work of the low-voltage domain does not control the on-off of the IGBT, the high-level or low-level signal representing abnormal work of the low-voltage domain is processed by the active short-circuit signal processing circuit, the driving signal output by the driving circuit controls the three-phase lower bridge of the IGBT to be on, and the three-phase upper bridge of the IGBT is turned off, so that the active short-circuit function is realized.
Example two
On the basis of the foregoing embodiment, referring to fig. 2, fig. 2 is a schematic diagram of an optical coupler driving circuit according to a second embodiment of the present invention, where the optical coupler driving circuit 101 includes a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1, and a first MOS transistor D1; the first resistor R1 is connected between the input end of the optocoupler driving circuit 101 and the gate of the first MOS transistor D1; the second resistor R2 is connected between the gate and the first pole of the first MOS transistor D1; a first pole of the first capacitor C1 is connected to a first end of the first resistor R1, and a second pole of the first capacitor C1 is connected to a first ground; a first pole of the first MOS transistor D1 is connected to the first ground terminal, a second pole of the first MOS transistor D1 is connected to the output terminal of the optocoupler drive circuit 101, and is connected to the power supply terminal of the optocoupler drive circuit 101 through a third resistor R3.
The first capacitor C1 is an electrostatic discharge capacitor for preventing the interface from being damaged by static electricity. The first resistor R1 is a driving resistor of the first MOS transistor D1, and the switching speed of the first MOS transistor D1 can be adjusted by adjusting the resistance value of the first resistor R1. The second resistor R2 is a default state resistor, pulled down to ground. When the port does not receive the active short-circuit signal 201, the second resistor R2 ensures that the first MOS transistor D1 is in an off state. It should be noted that the first resistor R1 and the second resistor R2 need to be selected to ensure that the conduction condition of the first MOS transistor D1 can be satisfied when the active short signal 201 is at a high level. The third resistor R3 is a drive current limiting resistor, and the resistance value is adjusted to ensure that the drive current meets the working requirement of the optical coupler. The low voltage domain logic supply voltage 203 supplies power for the optocoupler drive circuit. When the gate voltage is high, the first MOS transistor D1 is turned on, and the optocoupler drive signal 202 output by the output terminal of the optocoupler drive circuit 101 is at a low level; when the gate voltage is low, the first MOS transistor D1 is turned off, the output end of the optocoupler drive circuit 101 is pulled high by the low-voltage logic power supply through the third resistor R3, and the optocoupler drive signal 202 output by the output end of the optocoupler drive circuit 101 is at a high level.
In other embodiments of the present invention, the high-low voltage isolation device includes, but is not limited to, an optical coupling transmission device, and other devices capable of realizing high-low voltage isolation are also applicable to the present invention.
The optocoupler drive circuit provided by the embodiment has the following working states: the active short circuit signal 201 is output as an optocoupler drive signal 202 after passing through the optocoupler drive circuit. When the low-voltage domain works normally, the active short-circuit signal 201 is a PWM signal, and the optocoupler drive signal 202 is a PWM signal that is opposite in phase to the original PWM signal. When the low-voltage domain works abnormally, the active short-circuit signal 201 is at a high level, the optocoupler drive signal 202 is at a low level, the active short-circuit signal 201 is at a low level, and the optocoupler drive signal 202 is at a high level.
On the basis of the foregoing embodiment, referring to fig. 3, fig. 3 is a schematic diagram of a high-voltage and low-voltage isolation circuit according to a second embodiment of the present invention, where the high-voltage and low-voltage isolation circuit 102 includes a second capacitor C2, a third capacitor C3, a fourth resistor R4, and an optocoupler U1: the input end, the power supply input end and the output end of the optocoupler U1 are respectively connected with the input end, the power supply end and the output end of the high-low voltage isolation circuit 102; the second capacitor C2 is connected between the input end of the optocoupler U1 and the first ground end, the third capacitor C3 is connected between the power input end of the optocoupler U1 and the second ground end, and the fourth resistor R4 is connected between the voltage input end and the output end of the optocoupler U1.
The second capacitor C2 is a filter capacitor for filtering signal noise. The selection of the second capacitor C2 should be set according to the frequency of the input active short signal 201. The third capacitor C3 is a decoupling capacitor, also called decoupling capacitor, connected in parallel between the positive and negative poles of the circuit, and can prevent parasitic oscillation caused by the positive feedback path formed by the circuit through the power supply. The decoupling is to prevent the current fluctuation formed in the power supply circuit from influencing the normal operation of the circuit when the current magnitude of the front and rear circuits changes, in other words, the decoupling circuit can effectively eliminate the parasitic coupling between the circuits.
The optocoupler device U1 transmits an optocoupler-driven PWM signal and ensures isolation of high voltage and low voltage. When the optical coupler driving signal 202 is at a high level, the light emitting diode in the optical coupler device U1 is driven to work, and the isolation signal 204 output by the optical coupler device U1 is at a low level. When the optical coupler driving signal 202 is at a low level, the light emitting diode in the optical coupler device U1 does not work, the output end of the optical coupler device U1 is influenced by the external pull-up fourth resistor R4, and the isolation signal 204 output by the optical coupler device U1 is at a high level. The fourth resistor R4 is a pull-up resistor, and because the optocoupler U1 is OC output, the pull-up resistor provides pull-up for the output end of the optocoupler U1. The ground signal of the second ground is the negative terminal of the high-voltage battery, and needs to be distinguished from the low-voltage ground of the first ground, and attention is paid to isolation processing. The high-voltage domain logic power supply 205 powers the optocoupler device U1.
The high-low voltage isolation circuit provided by the embodiment completes the following functions: the high-low voltage isolation and the signal transmission are realized through the optical coupler; the working state of the high-voltage and low-voltage isolation circuit is as follows: when the optocoupler drive signal 202 is high, the output isolation signal 204 is low. When the optocoupler drive circuit is low, the output isolation signal 204 is at a high level. The optocoupler drive signal 202 is a PWM signal, and the output isolation signal 204 is in anti-phase with the optocoupler drive signal 202.
On the basis of the above embodiments, referring to fig. 4, fig. 4 is a schematic diagram of a filter circuit according to a second embodiment of the present invention, where the filter circuit includes a two-stage RC filter circuit. The filter circuit 103 comprises a fifth resistor R5, a sixth resistor R6, a fourth capacitor C4 and a fifth capacitor C5; a first end of the fifth resistor R5 is connected with the input end of the filter circuit 103, a second end of the fifth resistor R5 is connected with a first end of the sixth resistor R6, and a second end of the sixth resistor R6 is connected with the output end of the filter circuit 103; the fourth capacitor C4 is connected between the second terminal of the fifth resistor R5 and the second ground, and the fifth capacitor C5 is connected between the second terminal of the fifth resistor R5 and the second ground.
The fifth resistor R5 and the fourth capacitor C4 form a first-stage RC filter, and the sixth resistor R6 and the fifth capacitor C5 form a second-stage RC filter. The selection of the cut-off frequency of the two-stage filtering is needed to ensure that the filtered signal 206 after the two-stage RC filtering is closer to a dc signal. The isolated signal 204 is processed into an intermediate approximately dc filtered signal 206 by two-stage RC filtering.
Optionally, the filter circuit includes, but is not limited to, a two-stage RC circuit, and other multi-stage RC circuits and circuits capable of adjusting the PWM signal into a dc signal are also suitable for the present invention.
The filter circuit provided by the embodiment mainly completes the following functions: the isolation signal 204 output by the optocoupler U1 is processed into a signal close to direct current through two-stage RC filtering.
On the basis of the foregoing embodiment, referring to fig. 5, fig. 5 is a schematic diagram of a diagnostic circuit according to a second embodiment of the present invention, where the diagnostic circuit 104 includes a first voltage dividing circuit, a second voltage dividing circuit, a first comparator 208, a second comparator 209, and a seventh resistor R7; the input end of the first voltage division circuit is connected to the high-voltage domain logic power supply voltage, and the input end of the first voltage division circuit is connected to the first input end of the first comparator 208; a second input terminal of the first comparator 208 is connected to an input terminal of the diagnostic circuit, and an output terminal of the first comparator 208 is connected to an output terminal of the diagnostic circuit; a first input end of the second comparator 209 is connected with an input end of the diagnosis circuit, and an output end of the second comparator 209 is connected with an output end of the diagnosis circuit; the input end of the second voltage division circuit is connected to the high-voltage domain logic power supply voltage, and the output end of the second voltage division circuit is connected to the second input end of the second comparator 209; the first end of the seventh resistor R7 is connected to the output ends of the first comparator 208 and the second comparator 209, and the second end of the seventh resistor R7 is connected to the high voltage domain logic supply voltage.
The first voltage division circuit comprises an eighth resistor R8 and a ninth resistor R9, and the second voltage division circuit comprises a tenth resistor R10 and an eleventh resistor R11; a first end of the eighth resistor R8 is connected to a high-voltage domain logic power supply voltage, a second end of the eighth resistor R8 is connected to an output end of the first voltage division circuit, a first end of the ninth resistor R9 is connected to a second end of the eighth resistor, and a second end of the ninth resistor R9 is connected to a second ground end; the first end of the tenth resistor R10 is connected to the high-voltage domain logic supply voltage, the second end of the tenth resistor R10 is connected to the output end of the second voltage division circuit, the first end of the eleventh resistor R11 is connected to the second end of the tenth resistor R10, and the second end of the eleventh resistor R11 is connected to the second ground end.
The eighth resistor R8 and the ninth resistor R9 divide the voltage of the high-voltage domain logic power supply to obtain a low threshold value. The tenth resistor R10 and the eleventh resistor R11 divide the voltage of the high-voltage domain logic power supply to obtain a high threshold value. The second comparator 209 compares the filtered signal 206 with the high and low thresholds, respectively, and outputs a diagnosis result 207. Wherein the first comparator 208 diagnoses a low threshold on the filtered signal 206 and the second comparator 209 diagnoses a high threshold on the filtered signal 206. The comparator is an OD output, and the seventh resistor R7 serves as a pull-up resistor, so that the comparator U2 can normally output the diagnostic result 207. The high-voltage logic power supply 205 supplies power to the first voltage-dividing circuit, the second voltage-dividing circuit, the first comparator 208 and the second comparator 209.
According to the opto-coupler driving circuit, the high-low voltage isolation circuit, the filter circuit and other circuits at the front stage, the active short circuit signal 201 given by the low-voltage domain control module is processed into an approximate direct current filter signal 206 with a certain amplitude, the signal is a voltage value within a range of 0 and a high-voltage domain logic power supply value, and the approximate value of the value can be confirmed through simulation and the like. And the appropriate high and low threshold values are determined through an eighth resistor R8, a ninth resistor R9, a tenth resistor R10 and an eleventh resistor R11, and the input signal is compared with the high and low threshold values. The input filtered signal 206 is between the high and low thresholds and the output diagnostic result 207 is high. The input filtered signal 206 is below the low threshold or above the high threshold and the output diagnostic result 207 is low.
The diagnostic circuit provided by the embodiment mainly performs the following functions: the filtered signal 206 is subjected to threshold diagnosis, and a diagnosis result 207 is output.
On the basis of the foregoing embodiments, referring to fig. 6, fig. 6 is a schematic diagram of a driving circuit according to a second embodiment of the present invention, where the driving circuit includes a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, and a second MOS transistor D2; the twelfth resistor R12 is connected between the input end of the driving circuit and the gate of the second MOS transistor D2; the thirteenth resistor R13 is connected between the gate and the first pole of the second MOS transistor D2; a first end of the fourteenth resistor R14 is connected to the high voltage domain logic supply voltage, and a second end of the fourteenth resistor R14 is connected to the second pole of the second MOS transistor D2; the first pole of the second MOS transistor D2 is connected to the second ground terminal, and the second pole of the second MOS transistor D2 is connected to the output terminal of the driving circuit.
Wherein, high-voltage domain logic power supply 205 provides the power for drive circuit, and the circuit structure is similar with the scope opto-coupler drive circuit of single device, and no longer gives details here, and the main objective provides the signal that satisfies upper and lower bridge logic level and driving capability requirement.
With continuing reference to fig. 2 and 6, optionally, the output terminal of the driving circuit is connected to an output disable pin of a bridge driving chip (GD3100 or other similarly functioning driving device). When the input active short circuit signal 201 is normal, the ASC driving signal 210 output by the output end of the driving circuit is at a low level, and the upper bridge driving chip operates normally; when the input active short circuit signal 201 is abnormal, the ASC driving signal 210 output by the output end of the driving circuit is at a high level, the output of the upper bridge driving chip is disabled, and the IGBT upper bridge is kept in a default off state. The output end of the driving circuit is simultaneously connected with an output disable pin of a lower bridge driving chip (including but not limited to a driving device with similar functions such as GD 3100) and an ASC pin of a rear-stage buffer chip (including but not limited to a buffer device with similar functions such as 1EBN1001 AE) of the driving chip. When the input active short circuit signal 201 is normal, the ASC driving signal 210 output by the output end of the driving circuit is at a low level, and the lower bridge driving chip and the buffer chip operate normally; when the active short-circuit signal 201 is abnormal, the ASC driving signal 210 output by the output end of the driving circuit is at a high level, the output of the lower bridge driving chip is disabled, the ASC pin of the buffer chip is in an effective state, the buffer chip forcibly turns on the IGBT lower bridge, the three-phase power is short-circuited, and the active short-circuit function is completed.
The driving circuit provided by the embodiment mainly achieves the following functions: and providing turn-off and turn-on signals meeting the driving capability requirements of the upper bridge and the lower bridge.
On the basis of the above embodiments, referring to fig. 7, fig. 7 is a schematic diagram of a position of an active short-circuit signal processing circuit in a system according to an embodiment of the present invention.
The output end of the first end of the low-voltage domain control module is used for providing low-voltage domain logic power supply voltage for the active short-circuit signal processing circuit, and the second output end of the low-voltage domain control module is used for providing an active short-circuit signal for the active short-circuit signal processing circuit; the power of a high-voltage backup power supply is supplied to the input of a power battery, a first output end of the high-voltage backup power supply is used for providing high-voltage domain logic power supply for the active short-circuit signal processing circuit, and a second output end of the high-voltage backup power supply is respectively used for providing driving power supply for the upper bridge driving circuit and the lower bridge driving circuit; the first output end of the active short circuit signal processing circuit outputs a turn-off signal for controlling the upper bridge driving circuit, and the second output end of the active short circuit signal processing circuit outputs a turn-on signal for controlling the lower bridge driving circuit; the upper bridge driving circuit is used for controlling the on-off of an upper IGBT tube, and the lower bridge driving circuit is used for controlling the on-off of a lower IGBT tube, so that the starting and braking of the power motor are controlled; the power battery provides power supply input for the high-voltage backup power supply.
In an exemplary mode, a plurality of mechanisms exist for triggering active short circuit, a related circuit of the invention processes a state representation signal sent by a low-voltage control end of a motor, so that a PWM (Pulse Width Modulation) signal representing normal operation of a low-voltage domain does not control the on-off of an IGBT, a low-level signal representing abnormal operation of the low-voltage domain controls the three-phase lower bridge of the IGBT to be conducted, and meanwhile, the three-phase upper bridge of the IGBT is switched off, so that an active short circuit function is realized.
Illustratively, the main function is to identify and diagnose an active short-circuit signal sent by the low-voltage domain control module, and when the active short-circuit signal is normal, the upper and lower bridge driving circuits are not controlled. When the active short circuit signal is abnormal, a turn-off signal is sent to control the upper bridge driving circuit to turn off the upper IGBT tube, and a turn-on signal is sent to control the lower bridge driving circuit to turn on the lower IGBT tube. And further triggering an active short circuit function which is realized by completely depending on a hardware circuit and has the characteristics of reliability and quick response.
The logic power supply required by the invention is divided into a low-voltage part and a high-voltage part. The low-voltage domain logic supply voltage is generated by a low-voltage domain control module. The low voltage logic power supply is not a necessary condition for triggering the active short circuit function normally. And the abnormal power supply of the low-voltage logic inevitably triggers the active short circuit. The logic power supply of the high-voltage domain is generated by a high-voltage backup power supply, so that when the active short-circuit function is triggered, reliable logic power supply is provided to ensure the circuit function to be realized.
The technical scheme of this embodiment, through the hardware circuit that outside discrete device and opto-coupler were built, solved under the unusual (contain power supply anomaly) condition of low-voltage domain work, can not effectively export reliable control signal, can not initiatively short circuit's problem, reached under the vehicle out of control the condition, can make the three-phase voltage short circuit, provide reverse torque for the vehicle, the speed of a motor vehicle slows down, realizes the slow braking of vehicle, reaches the effect of safe driving.
EXAMPLE III
A vehicle comprising an active short signal processing circuit as described in any embodiment of the invention.
The main idea of the present invention is to transmit the PWM type active short circuit signal 201 representing the normal operation of the low voltage domain control module through the devices in the high and low voltage isolation circuit 102, adjust the signal into a signal that can be used for the diagnosis of the diagnosis circuit 104 through the filter circuit 103, and adjust the diagnosis result 207 into a driving signal through the driving circuit 105, thereby facilitating the driving control. The high-voltage and low-voltage isolation is performed, and the low-voltage domain active short circuit signal 201 can directly act on the high-voltage domain after being processed by the signal processing method. The influence of low-voltage power supply is avoided, and the safety is higher. The circuit provided by the invention is a pure hardware circuit, has no software delay and is faster in response to signals. The invention can also identify the logic power supply fault of the low-voltage domain and trigger the active short circuit, the signals processed by the circuit described by the invention respectively act on the upper bridge and the lower bridge, and the turn-off of the upper bridge and the turn-on of the lower bridge are realized by means of the original pin functions of the system driving chip and the buffering chip.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (9)
1. An active short signal processing circuit, comprising:
the system comprises an optical coupling driving circuit, a high-low voltage isolation circuit, a filter circuit, a diagnosis circuit and a driving circuit;
the optical coupler driving circuit comprises an input end, an output end and a power supply end, wherein the input end of the optical coupler driving circuit is connected with an active short circuit signal output by a low-voltage domain, and the power supply end of the optical coupler driving circuit is connected with a low-voltage domain logic power supply voltage;
the high-low voltage isolation circuit comprises an input end, an output end and a power supply end, the input end of the high-low voltage isolation circuit is connected with the output end of the optocoupler drive circuit, the power supply end of the high-low voltage isolation circuit is connected with a high-voltage domain logic power supply voltage, and the high-low voltage isolation circuit is used for carrying out isolation transmission on signals at the input end;
the filter circuit comprises an input end and an output end, and the input end of the filter circuit is connected with the output end of the high-low voltage isolation circuit;
the diagnostic circuit comprises an input end and an output end, the input end of the diagnostic circuit is connected with the output end of the filter circuit, and the diagnostic circuit is used for determining whether the low-voltage domain works normally or not according to a signal input by the input end of the diagnostic circuit and outputting a control signal corresponding to the normal or abnormal work of the low-voltage domain;
the input end of the driving circuit is connected with the output end of the diagnosis circuit, and the output end of the driving circuit is connected with the bridge driving chip and used for outputting a driving signal corresponding to the control signal output by the diagnosis circuit;
the optical coupler driving circuit comprises a first resistor, a second resistor, a third resistor, a first capacitor and a first MOS (metal oxide semiconductor) tube;
the first resistor is connected between the input end of the optocoupler driving circuit and the grid electrode of the first MOS tube;
the second resistor is connected between the grid electrode and the first electrode of the first MOS tube;
a first pole of the first capacitor is connected with a first end of the first resistor, and a second pole of the first capacitor is connected with a first ground end;
the first pole of the first MOS tube is connected with the first ground end, the second pole of the first MOS tube is connected with the output end of the optical coupler driving circuit, and the output end of the optical coupler driving circuit is connected with the power supply end of the optical coupler driving circuit through the third resistor.
2. The active short circuit signal processing circuit of claim 1, wherein the high-low voltage isolation circuit comprises a second capacitor, a third capacitor, a fourth resistor, and an optocoupler device:
the input end, the power supply input end and the output end of the optocoupler are respectively connected with the input end, the power supply end and the output end of the high-low voltage isolation circuit;
the second capacitor is connected between the input end of the optical coupler and the first ground end, the third capacitor is connected between the power input end of the optical coupler and the second ground end, and the fourth resistor is connected between the voltage input end and the output end of the optical coupler.
3. The active short signal processing circuit of claim 1 wherein the filter circuit comprises a two-stage RC filter circuit.
4. The active short signal processing circuit of claim 3 wherein the filter circuit comprises a fifth resistor, a sixth resistor, a fourth capacitor, and a fifth capacitor;
a first end of the fifth resistor is connected with the input end of the filter circuit, a second end of the fifth resistor is connected with a first end of the sixth resistor, and a second end of the sixth resistor is connected with the output end of the filter circuit;
the fourth capacitor is connected between the second end of the fifth resistor and the second ground, and the fifth capacitor is connected between the second end of the fifth resistor and the second ground.
5. The active short signal processing circuit of claim 1 wherein the diagnostic circuit comprises a first voltage divider circuit, a second voltage divider circuit, a first comparator, a second comparator, and a seventh resistor;
the input end of the first voltage division circuit is connected with a high-voltage domain logic power supply voltage, and the output end of the first voltage division circuit is connected with the first input end of the first comparator;
the second input end of the first comparator is connected with the input end of the diagnosis circuit, and the output end of the first comparator is connected with the output end of the diagnosis circuit;
the first input end of the second comparator is connected with the input end of the diagnosis circuit, and the output end of the second comparator is connected with the output end of the diagnosis circuit;
the input end of the second voltage division circuit is connected with a high-voltage domain logic power supply voltage, and the output end of the second voltage division circuit is connected with the second input end of the second comparator;
the first end of the seventh resistor is connected with the output ends of the first comparator and the second comparator, and the second end of the seventh resistor is connected with a high-voltage domain logic power supply voltage.
6. The active short signal processing circuit of claim 5 wherein the first voltage divider circuit comprises eighth and ninth resistors and the second voltage divider circuit comprises tenth and eleventh resistors;
a first end of the eighth resistor is connected to a high-voltage domain logic power supply voltage, a second end of the eighth resistor is connected to an output end of the first voltage division circuit, a first end of the ninth resistor is connected to a second end of the eighth resistor, and a second end of the ninth resistor is connected to a second ground end;
a first end of the tenth resistor is connected to a high-voltage domain logic supply voltage, a second end of the tenth resistor is connected to an output end of the second voltage division circuit, a first end of the eleventh resistor is connected to a second end of the tenth resistor, and a second end of the eleventh resistor is connected to a second ground end.
7. The active short-circuit signal processing circuit of claim 1, wherein the driving circuit comprises a twelfth resistor, a thirteenth resistor, a fourteenth resistor and a second MOS transistor;
the twelfth resistor is connected between the input end of the driving circuit and the grid electrode of the second MOS tube;
the thirteenth resistor is connected between the grid electrode and the first electrode of the second MOS tube;
a first end of the fourteenth resistor is connected to a high-voltage domain logic power supply voltage, and a second end of the fourteenth resistor is connected to a second pole of the second MOS transistor;
and the first pole of the second MOS tube is connected with a second ground end, and the second pole of the second MOS tube is connected with the output end of the driving circuit.
8. The active short-circuit signal processing circuit of claim 1, wherein the active short-circuit signal output by the low voltage domain comprises a PWM signal during normal operation.
9. A vehicle comprising an active short signal processing circuit according to any one of claims 1 to 8.
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