CN112670955A - Motor relay protection device based on double N-channel IGBT series connection - Google Patents
Motor relay protection device based on double N-channel IGBT series connection Download PDFInfo
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Abstract
The invention discloses a motor relay protection device based on double N-channel IGBT series connection, which comprises a switch unit, an IGBT driving unit, a short-circuit protection unit and a DSP control unit, wherein the DSP control unit is used for controlling a plurality of IGBT driving units to work synchronously; the switch unit comprises a plurality of N-channel IGBTs, each N-channel IGBT is externally connected with a short-circuit protection unit, the sources of the two N-channel IGBTs are connected in series to form a common-source double N-channel IGBT, the switch unit formed by the mutual parallel connection of the double N-channel IGBTs is used as an on-off switch of a main loop of the motor, the grids of the double N-channel IGBTs are externally connected to the output end of the IGBT driving unit, and the output ends of the two short-circuit protection units are respectively connected to the input.
Description
Technical Field
The invention relates to the technical field of motor relay protection, in particular to a motor relay protection device based on double N-channel IGBT series connection.
Background
For a motor power system, the system safety needs to depend on the protection of a relay protection system and a relay protection device. When a motor in the power system fails, the overall safety of the power system may be affected, and the relay protection device may alarm or issue a command to disconnect the motor circuit to resolve the dangerous failure.
With the application of motor motors in various industries, especially in some important occasions such as military industry, the requirement for motor relay protection action time is higher originally, and the requirements for the service life and maintenance of relay protection action devices are higher and higher.
The current common sampling modes of the motor relay protection device mainly comprise three modes, wherein the first mode is to directly use a circuit breaker with overload, open phase and short circuit; the second type is an intelligent relay protection device which comprises a voltage and current detection module, a control unit and a relay unit, wherein the working principle of the intelligent relay protection device is that the control unit detects external voltage and current signals, judges faults through the operation of a data processor, sends instructions to a PWM (pulse-width modulation) driving circuit and an IGBT (insulated gate bipolar translator), and controls the on-off of a coil of a relay or a contactor; the third is a relay protection and speed regulation system of an intelligent motor based on DSP and a thyristor, which describes a breaking and suction switch using the thyristor and a thyristor driving circuit as a main loop.
The main circuit switch of the relay protection device utilizes a relay, a breaker or a thyristor; for a relay protection device on a frequent starting occasion, an electric arc is easily generated in the breaking process of a relay or a breaker, the service life of a contact is influenced, and an actuating mechanism is easily aged along with the increase of the service time, so that the failure of a device is possibly caused; the turn-off of the thyristor has time delay, when the driver receives a turn-off command and the loop current crosses zero, the thyristor is turned off, and the current may last for half cycle under severe conditions, so that the system cannot be protected in time. Therefore, the motor cannot be well protected by relaying.
Disclosure of Invention
Based on the technical problems in the prior art, the invention provides the motor relay protection device based on the series connection of the double N-channel IGBTs, the N-channel IGBT is used as the on-off switch of the motor main loop, the fault response time is shortened, meanwhile, the N-channel IGBT does not generate electric arcs when working, and the service life of the N-channel IGBT is prolonged.
The invention provides a motor relay protection device based on double N-channel IGBT series connection, which comprises a switch unit, an IGBT driving unit, a short-circuit protection unit and a DSP control unit, wherein the DSP control unit is used for controlling a plurality of IGBT driving units to work synchronously; the switch unit comprises a plurality of N-channel IGBTs, each N-channel IGBT is externally connected with a short-circuit protection unit, the sources of the two N-channel IGBTs are connected in series to form a common-source double N-channel IGBT, the switch unit formed by the mutual parallel connection of the double N-channel IGBTs is used as an on-off switch of a main loop of the motor, the grids of the double N-channel IGBTs are externally connected to the output end of the IGBT driving unit, and the output ends of the two short-circuit protection units are respectively connected to the input.
Furthermore, the IGBT driving unit comprises a fault latch blocking unit and two isolation driving circuits, the input end of the fault latch blocking unit is connected with the output end of the short-circuit protection unit, the output end of the fault latch blocking unit is connected with the input end of the DSP control unit, the output ends of the two isolation driving circuits are respectively connected with the grid electrode of the N-channel IGBT in the double N-channel IGBT, and the input ends of the two isolation driving circuits are respectively connected with the EPWM signal output end of the DSP control unit.
Further, the protection circuit comprises a comparator CMP1, an inverter Nor1, a triode Qa, a capacitor C1, a first current source and a second current source, wherein the positive pin input end of the comparator CMP1 is respectively connected with the output end of the first current source, one end of the capacitor C1 and the drain electrode of the N-channel IGBT, the negative pin input end of the comparator CMP1 is respectively connected with the output end of the second current source and the emitter electrode of the N-channel IGBT, the output end of the comparator CMP1 is connected with the input end of the fault latch lockout unit, the positive pin end of the inverter Nor1 is connected with the gate electrode of the N-channel IGBT, the negative pin is connected with the gate electrode of the triode Qa, and the drain electrode of the triode Qa is connected to the positive pin input end of the comparator CMP1, and the source electrode of.
Furthermore, the protection circuit further comprises a resistor R1, a resistor R2, a diode D1 and a voltage stabilizing diode Z1, wherein the output end of the second current source is connected to the emitter of the N-channel IGBT through the resistor R2, one end of the resistor R1 is connected with the positive pin of a comparator CMP1, and the other end of the resistor R1 is connected to the drain of the N-channel IGBT after being sequentially connected with the diode D1 and the voltage stabilizing diode Z1.
Furthermore, the isolation driving circuit comprises a driving optocoupler and a current limiting resistor R10, wherein the input end of the driving optocoupler is connected to the EPWM signal output end of the DSP control unit through the current limiting resistor R10, and the output end of the driving optocoupler is connected to the grid electrode of the N-channel IGBT.
Furthermore, the DSP control unit comprises a digital signal processor, a current sensor for detecting three-phase current at the input end of the motor, a voltage sensor for detecting three-phase voltage at the input end of the motor, a first temperature sensor for detecting the running temperature of the motor and a second temperature sensor for detecting the running temperature of the IGBT driving unit;
the output end of the current sensor and the output end of the voltage sensor are respectively connected with an A/D interface of the digital signal processor, the output end of the first temperature sensor is connected with a T-M interface of the digital signal processor, the second temperature sensor is connected with a T-NTC interface of the digital signal processor, and the input end of the digital signal processor is connected with the output end of the fault latch locking unit.
Further, the plurality of N-channel IGBTs are respectively a transistor Q1, a transistor Q2, a transistor Q3, a transistor Q4, a transistor Q5, and a transistor Q6, the transistor Q1 is connected in series with a common source of the transistor Q2, the transistor Q3 is connected in series with a common source of the transistor Q4, the transistor Q5 is connected in series with a common source of the transistor Q6, a drain of the transistor Q1, a drain of the transistor Q3, and a drain of the transistor Q3 are respectively connected to an output terminal of the inverter for controlling the motor, and a drain of the transistor Q2, a drain of the transistor Q4, and a drain of the transistor Q6 are respectively connected to an input terminal of the.
The motor relay protection device based on the double N-channel IGBT series connection has the advantages that: according to the motor relay protection device based on the double-N-channel IGBT series connection, the formed double-N-channel IGBT is used as the on-off switch of the motor main loop, so that the response time of relay protection is greatly prolonged, and the defect of delayed response in traditional motor relay protection is overcome. Meanwhile, the N-channel IGBT is used as an on-off switch of a main loop of the motor, and the service life of the N-channel IGBT is far longer than that of a contactor or a relay used in the prior art; the short-circuit protection unit is arranged, so that when the whole system has a short-circuit fault, the main circuit switch can be cut off in time, and the motor is effectively protected from short circuit; and all PWM drives are blocked by the DSP control unit so as to ensure that all N-channel IGBTs are completely closed and turned off.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a control block diagram of an IGBT driving unit and a short-circuit protection unit;
FIG. 3 is a circuit diagram of a short circuit protection unit;
FIG. 4 is a circuit diagram of an isolated drive circuit;
FIG. 5 is a schematic diagram of the fault control of the DSP control unit;
the device comprises a switch unit 1, an IGBT (insulated gate bipolar transistor) driving unit 2, a short-circuit protection unit 3, a motor 4 and a DSP (digital signal processor) control unit 5.
Detailed Description
The present invention is described in detail below with reference to specific embodiments, and in the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.
As shown in fig. 1 to 5, the motor relay protection device based on the double N-channel IGBT series connection provided by the present invention includes a switch unit 1, an IGBT driving unit 2, a short circuit protection unit 3, and a DSP control unit 5 for controlling the multiple IGBT driving units 2 to work synchronously, wherein an input end of the switch unit 1 is connected to an ac power supply, an output end is connected to an input end of a motor 4, the DSP control unit 5 is connected to the IGBT driving unit 2, and the short circuit protection unit 3 is connected to the DSP control unit 5 through the IGBT driving unit 2; the switch unit 1 comprises a plurality of N-channel IGBTs, each N-channel IGBT is externally connected with a short-circuit protection unit 3, the sources of the two N-channel IGBTs are connected in series to form a common-source double N-channel IGBT, the switch unit 1 formed by the double N-channel IGBTs in parallel serves as an on-off switch of a main loop of the motor 4, the grids of the double N-channel IGBTs are externally connected to the output end of the IGBT driving unit 2, and the output ends of the two short-circuit protection units 3 are respectively connected to the input end of the IGBT driving.
The formed double N-channel IGBT is used as an on-off switch of a motor main loop, so that the response time of relay protection is greatly prolonged, and the defect of delay in traditional motor relay protection is overcome. Meanwhile, an N-channel IGBT is used as an on-off switch of a main loop of the motor 4, and the service life of the N-channel IGBT is far longer than that of a contactor or a relay used in the prior art; the short-circuit protection unit 3 can timely cut off the main loop switch when the whole system has a short-circuit fault, so that the motor 4 is effectively protected from short circuit.
Each N-channel IGBT is externally connected with a short-circuit protection unit 3 to realize real-time fault protection of each N-channel IGBT so as to ensure that a main loop is cut off in time when a system is short-circuited, and reports the signals to a DSP control unit 5 to block EPWM (electronic pulse width modulation) signals sent by the DSP control unit 5, so that the IGBT drive unit 2 is ensured to be completely closed, and meanwhile, the delay of motor protection is reduced; the double-N-channel IGBT shares one driving unit 2, so that each N-channel IGBT in the double-N-channel IGBT is controlled to act simultaneously, the work synchronism of the double-N-channel IGBT is ensured, the defects of delay, loss, dislocation and the like of data transmission caused by asynchronous work of the two serially-connected N-channel IGBTs are avoided, and the accuracy of motor relay protection is improved.
This application is through carrying out motor overcurrent, lack looks, high frequency, low frequency etc. detection in the power supply engineering to motor 4 for motor 4 operates stably, forms non-delayed switch on-off control, has protected entire system's safety, stable, effective operation.
Furthermore, the IGBT driving unit 2 includes a fault latch blocking unit and two isolation driving circuits, an input end of the fault latch blocking unit is connected with an output end of the short-circuit protection unit 3, an output end of the fault latch blocking unit is connected with an input end of the DSP control unit 5, output ends of the two isolation driving circuits are respectively connected with gates of N-channel IGBTs in the double N-channel IGBTs, input ends of the two isolation driving circuits are respectively connected with an EPWM signal output end of the DSP control unit 5 to the fault latch blocking unit for blocking driving of the current PWM, so that the N-channel IGBTs connected with the IGBT driving unit 2 are turned off, and meanwhile, the latch signal is uploaded to the DSP control unit 5, and driving of all the PWMs is blocked by the DSP control unit 5, so as to ensure that all the N-channel IGBTs.
The EPWM outputs an EPWM signal for the DSP control unit, and the PWM signal is obtained after the EPWM is amplified by the isolation driving circuit. The fail latch lockout unit may be an MMBT3904 transistor using NPN to pull the PWM signal low. The fail latch lockout unit may employ the reset chip of SP 706.
The isolation driving circuit of each phase is shown in fig. 4, and comprises a driving optocoupler and a current limiting resistor R10, wherein the input end of the driving optocoupler is connected to the EPWM signal output end of the DSP control unit 5 through the current limiting resistor R10, and the output end of the driving optocoupler is connected to the gate of the N-channel IGBT. The driving optocoupler can adopt a component with the type FOD3120S for isolating the EPWM signal from the PWM driving signal of the IGBT driving unit 2.
In the same phase, the driving signals of the same PWM are respectively connected with the grid ends of the N-channel IGBT of the two common sources in two. That is, the EPWM signal connections shown in fig. 2 are respectively connected to the input ends of two independent isolation driving circuits, the same EPWM driving signal is processed by the two independent isolation driving circuits to obtain two independent PWM driving signals, and each isolation driving circuit is connected to the corresponding N-channel IGBT gate, so that the two independent PWM driving signals drive the N-channel IGBT through the N-channel IGBT gate. That is, the EPWM signal sent by the DSP control unit 5 simultaneously controls two isolated driving circuits of the gates of Q1 and Q2, thereby driving two N-channel IGBTs of Q1 and Q2.
The double N-channel IGBTs of the common source are connected in series in the alternating current main loop, the driving signals are added between the grid and the source, the voltage of the source is fluctuated, and after the independent isolation driving circuit is used, the PWM driving signal of each N-channel IGBT and the EPWM driving signal output by the DSP control unit 5 can be completely separated, so that the whole relay protection circuit is safe and reliable.
Further, the protection circuit comprises a comparator CMP1, an inverter Nor1, a triode Qa, a capacitor C1, a first current source and a second current source, wherein the positive pin input end of the comparator CMP1 is respectively connected with the output end of the first current source, one end of the capacitor C1 and the drain electrode of the N-channel IGBT, the negative pin input end of the comparator CMP1 is respectively connected with the output end of the second current source and the emitter electrode of the N-channel IGBT, the output end of the comparator CMP1 is connected with the input end of the fault latch lockout unit, the positive pin end of the inverter Nor1 is connected with the gate electrode of the N-channel IGBT, the negative pin is connected with the gate electrode of the triode Qa, and the drain electrode of the triode Qa is connected to the positive pin input end of the comparator CMP1, and the source electrode of. The protection circuit further comprises a resistor R1, a resistor R2, a diode D1 and a voltage stabilizing diode Z1, wherein the output end of a second current source is connected to the emitter of the N-channel IGBT through the resistor R2, one end of a resistor R1 is connected with the positive pin of a comparator CMP1, and the other end of the resistor R1 is connected to the drain of the N-channel IGBT after being sequentially connected with the diode D1 and the voltage stabilizing diode Z1.
The inverter Nor1 and the transistor Qa function to make the PWM driving signal at low level, at which time Q1 is in off state, the drain of the N-channel IGBT may be in high voltage state, at which time the protection circuit is bypassed, and the pin of the comparator CMP1 is pulled low all the time; when the grid of the N-channel IGBT is at a high level, the IGBT starts to be conducted, and the protection circuit works normally. The second current source generates a fixed voltage drop on R2 as a reference for the protection value; the first current source generates voltage drop in R1, diode D1 and Zener diode Z1, and adds with the drain voltage of the N channel IGBT to form feedback voltage, and compares with the reference voltage, when the voltage exceeds the reference voltage, the protection circuit acts.
The negative pin of the comparator CMP1 forms a reference voltage through a second current source, the reference voltage is used as a reference voltage Vref at the "-" end of the comparator CMP1, the positive pin of the comparator CMP1 acquires the voltage of the drain electrode of the N-channel IGBT in real time, when the detected voltage rises to be larger than the Vref, the output level of the comparator CMP1 is inverted, the PWM1 is blocked to drive through the fault latch blocking unit, and meanwhile, a level inversion signal is latched through the fault latch blocking unit and is uploaded to the DSP control unit.
Specifically, the DSP control unit comprises a digital signal processor, a current sensor for detecting three-phase current at the input end of the motor, a voltage sensor for detecting three-phase voltage at the input end of the motor, a first temperature sensor for detecting the running temperature of the motor and a second temperature sensor for detecting the running temperature of the IGBT; the output ends of the current sensors and the voltage sensors are respectively connected with an A/D interface ((for example, 37 Pin-42 Pin corresponding to ADCINA 5-A0)) of the digital signal processor, the output end of the first temperature sensor is connected with a T-M interface (for example, 46Pin corresponding to ADCINB0) of the digital signal processor, the second temperature sensor is connected with a T-NTC interface (for example, 47Pin corresponding to ADCINB1) of the digital signal processor, and the input end (for example, 21 Pin corresponding to TZ1) of the digital signal processor is connected with the output end of the fault latch locking unit. The digital signal processor adopts a TMS320F28335 chip.
The arrangement of the current sensor, the voltage sensor, the first temperature sensor and the second temperature sensor can convey signals such as current, voltage and temperature of the motor to the TMS320F28335 chip, and the TMS320F28335 chip can be used for operation, so that faults such as overcurrent, open phase, high frequency and low frequency of the motor can be judged. The schematic diagram of the working principle is shown in fig. 5, and is explained in detail as follows:
TMS320F28335 chip collects three-phase current I1、I2、I3Respectively calculating the positive sequence component I of the currentA1Negative sequence component IA2Zero sequence component IA0(ii) a And judging whether the faults such as overload, locked rotor, open phase, reverse phase, unbalance, single-phase grounding, two-phase grounding and the like exist. TMS320F28335 chip collects three-phase voltage U1、U2、U3And judging whether the motor is in overvoltage and undervoltage faults or not according to the voltage value. When short-circuit fault occurs, the fault latch locking unit locks PWM1, PWM2 and PWM3 signals and uploads the locking signals to the TMS320F28335 chip, the TMS320F28335 chip closes output EPW1, EPWM2 and EPWM3 signals, and then closes the TMS320F28335 chipQ1-Q6, and simultaneously sends the DSP short-circuit fault signal to all short-circuit protection units 3 to realize the short-circuit protection of the N-channel IGBT.
The application takes a three-phase motor as an example, and is specifically explained by combining the accompanying drawings:
the plurality of N-channel IGBTs are respectively a transistor Q1, a transistor Q2, a transistor Q3, a transistor Q4, a transistor Q5 and a transistor Q6, a transistor Q1 is connected with a transistor Q2 in series in a common source, a transistor Q3 is connected with a transistor Q4 in series in a common source, a transistor Q5 is connected with a transistor Q6 in series in a common source, a drain electrode of the transistor Q1, a drain electrode of the transistor Q3 and a drain electrode of the transistor Q3 are respectively connected with an output end of a frequency converter for controlling the motor through the frequency converter, and a drain electrode of the transistor Q2, a drain electrode of the transistor Q4 and a drain electrode of the transistor Q6 are respectively. Each transistor is externally connected with a short-circuit protection unit 3 in parallel, the transistor Q1 and the transistor Q2 share one IGBT driving unit 2, the transistor Q3 and the transistor Q4 share one IGBT driving unit 2, the transistor Q5 and the transistor Q6 share one IGBT driving unit 2, and the three IGBT driving units 2 are connected into one DSP control unit 5.
It should be understood that six N-channel IGBTs are divided into three groups, Q1 and Q2, Q3 and Q4, Q5 and Q6, two N-channel IGBTs are connected in series in a common source to serve as a switching-on and switching-off device of a three-phase motor main circuit, a fault processing signal is quickly responded by the high-speed switching performance of the N-channel IGBTs, an arc is not generated when the N-channel IGBT is used as a disconnecting switch of the main circuit, and the service life of the relay protection device is prolonged.
The short-circuit protection units 3 are operated independently before each other, when a three-phase motor is in short circuit, PWM driving signals can be blocked by the fault latch blocking unit in the IGBT driving unit 2 within about 10us, the PWM driving signals are reported to the DSP control unit 5, the front-stage gate driving signals are closed, and the relay protection device can be guaranteed to operate reliably.
As can be clearly seen from fig. 2, each group of double N-channel IGBT branches is separately designed with an isolation driving circuit, wherein the PWM1 controls the on/off of two N-channel IGBTs Q1 and Q2 through the driving isolation circuit, the PWM2 controls the on/off of two IGBTs Q3 and Q4 through the driving isolation circuit, and the PWM3 controls the on/off of two IGBTs Q5 and Q6 through the driving isolation circuit. Meanwhile, three current sensors T1, T2 and T3 respectively detect three-phase currents of the motor, three current signals I1, I2 and I3 enter a DSP control unit, three-phase voltages U1, U2 and U3 and the temperature of the motor are detected simultaneously, and faults of overcurrent, open phase, high frequency, low frequency and the like of the motor are judged through the DSP control unit;
according to the fault signal grade and the recovery condition, the DSP control unit 5 sends control signals to the IGBT driving unit and the short-circuit protection unit to control the on-off of the three groups of IGBT switches.
Regarding short-circuit protection of the motor 4, the short-circuit protection circuit of 6N-channel IGBTs is the same, and here, taking Q1 as an example, the circuit block diagram is shown in fig. 1 to 3, and the operation principle is as follows:
1) when a PWM1 signal is input into a low level, the N-channel IGBT is closed, and at the moment, a driving signal of the PWM1 drives the triode Qa through the inverter Nor1, so that a pin of a plus pole of the comparator CMP1 is pulled low, and the short-circuit protection unit 3 does not act;
2) when the N-channel IGBTs are in short circuit between single phase and opposite ground or between two phases of a main loop, the current flowing through each N-channel IGBT rapidly rises within a few us of time, when the current rises to about 3-4 times of rated current, the drain voltage Vce of the transistor Q1 rapidly rises, and the N-channel IGBT generates desaturation;
3) at this time, a given current flows through R2 by the second current source to form a reference voltage, which is used as a reference voltage Vref at the "-" terminal of the comparator CMP1, the value of the capacitor C1 is used for setting a protection operation time under the action of the first current source, when a short circuit occurs, the "+" terminal of the comparator CMP1 detects a Vce voltage through the first current source, the resistor R1, the diode D1 and the zener diode Z1, and when the Vce voltage rises to be greater than Vref, the output level of the comparator CMP1 is inverted, the PWM1 is blocked from being driven by the fault latch blocking unit, a level inversion signal is latched and uploaded to the DSP control unit, and the DSP control unit controls the turn-off of other transistors Q2 to Q6.
Therefore, in the embodiment, in the synchronous control of the control signals and the execution signals of the three groups of N-channel IGBTs connected in series, wherein three EPWM1, EPWM2 and EPWM3 signals sent by the DSP control unit 5 need to be executed synchronously, PWM driving signals of the three groups of N-channel IGBTs are controlled respectively, and the driving signal of each group of N-channel IGBTs connected in series is the same PWM control signal, so as to ensure that six IGBT switches are turned on and off simultaneously;
each N-channel IGBT is provided with a special short-circuit protection unit 3 to ensure that a main loop is timely disconnected when a system is short-circuited, and the control signals of EPWM1, EPWM2 and EPWM3 sent by the DSP control unit 5 are blocked to ensure that three paths of IGBT drives are completely closed.
It should be understood that if the motor is a single phase motor, two series-connected N-channel IGBTs may be provided to form a double N-channel IGBT, which is connected to the input of the single phase motor; if the motor is a two-phase motor, two groups of double N-channel IGBTs can be arranged, each group of double N-channel IGBT consists of two N-channel IGBTs which are connected in series, and the two groups of double N-channel IGBTs are connected in parallel and then are connected to the input of the two-phase motor; similarly, if the motor is an excitation motor or a motor with a plurality of power loops, the double-N-channel IGBTs with the same number of motor loops can be arranged and connected to the input of the two-phase motor through a plurality of groups of double-N-channel IGBTs. So as to utilize the high-speed switching performance of the N-channel IGBT and quickly respond to the fault processing signal.
Therefore, the N-channel IGBT is arranged, so that the defects that in the traditional relay protection device, electric arcs are easily generated in the breaking process of a relay or a breaker on frequent starting occasions, the service life of a contact is influenced, and an executing mechanism is easily aged along with the increase of service time, so that devices are possibly failed and the like are overcome.
Meanwhile, the N-channel IGBT common source electrode is connected in series to serve as the on-off switch of the main circuit, the defect that an actuating mechanism of the main circuit in a traditional intelligent relay protection device is still a relay or a circuit breaker and cannot meet the situation that the requirement on protection time is higher, for example, for short-circuit protection, the detection current exceeds a rated value of multiple times, a control unit judges that the circuit breaker is possibly in a short-circuit state at the moment, and sends an instruction to open the circuit breaker, and the action time of the circuit breaker is at least ms level is overcome.
Meanwhile, through fault protection of the short-circuit protection unit and quick response of the N-channel IGBT, the problem that a thyristor is turned off when a driver receives a turn-off command and loop current crosses zero point because the thyristor is turned off in a breaking switch of a main loop which replaces a breaker of a traditional intelligent relay protection device is avoided, current can continuously last for half cycle under severe conditions, and the system cannot be protected in time.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (7)
1. A motor relay protection device based on double N-channel IGBT series connection is characterized by comprising a switch unit (1), IGBT driving units (2), a short-circuit protection unit (3) and a DSP control unit (5) used for controlling a plurality of IGBT driving units (2) to work synchronously, wherein the input end of the switch unit (1) is connected with an alternating current power supply, the output end of the switch unit is connected to the input end of a motor (4), the DSP control unit (5) is connected with the IGBT driving units (2), and the output end of the short-circuit protection unit (3) is connected with the input end of the DSP control unit (5) through the IGBT driving units (2);
the switch unit (1) comprises a plurality of N-channel IGBTs, each N-channel IGBT is externally connected with a short-circuit protection unit (3), the sources of the two N-channel IGBTs are connected in series to form a common source double N-channel IGBT, the switch unit (1) formed by the double N-channel IGBTs in parallel serves as an on-off switch of a main loop of the motor (4), the grid electrodes of the double N-channel IGBTs are externally connected with the output end of the IGBT driving unit (2), and the output ends of the two short-circuit protection units (3) are respectively connected to the input end of the IGBT driving unit (2).
2. The motor relay protection device based on double N-channel IGBT series connection of claim 1, characterized in that, the IGBT driving unit (2) comprises a fault latch blocking unit and two isolation driving circuits, wherein the input end of the fault latch blocking unit is connected with the output end of the short-circuit protection unit (3), the output end of the fault latch blocking unit is connected with the input end of the DSP control unit (5), the output ends of the two isolation driving circuits are respectively connected with the grid electrode of the N-channel IGBT in the double N-channel IGBT, and the input ends of the two isolation driving circuits are respectively connected with the WM EPsignal output end of the DSP control unit (5).
3. The motor relay protection device based on the series connection of the double N-channel IGBTs as claimed in claim 1, wherein the protection circuit comprises a comparator CMP1, an inverter Nor1, a triode Qa, a capacitor C1, a first current source and a second current source, a positive pin input end of the comparator CMP1 is respectively connected with an output end of the first current source, one end of the capacitor C1 and a drain electrode of the N-channel IGBT, a negative pin input end of the comparator CMP1 is respectively connected with an output end of the second current source and an emitter electrode of the N-channel IGBT, an output end of the comparator CMP1 is connected with an input end of the fault latch lockout unit, a positive pin end of the inverter Nor1 is connected with a gate electrode of the N-channel IGBT, a negative pin end of the comparator CMP1 is connected with a gate electrode of the triode Qa, and a drain electrode of the triode Qa is connected with the positive pin input end.
4. The motor relay protection device based on the series connection of the double N-channel IGBTs as claimed in claim 3, wherein the protection circuit further comprises a resistor R1, a resistor R2, a diode D1 and a zener diode Z1, the output end of the second current source is connected to the emitter of the N-channel IGBT through the resistor R2, one end of the resistor R1 is connected with the positive pin of a comparator CMP1, and the other end of the resistor R1 is connected to the drain of the N-channel IGBT after being sequentially connected with the diode D1 and the zener diode Z1.
5. The motor relay protection device based on the series connection of the double N-channel IGBTs, as claimed in claim 2, wherein the isolation driving circuit comprises a driving optocoupler and a current limiting resistor R10, wherein the input end of the driving optocoupler is connected to the EPWM signal output end of the DSP control unit (5) through the current limiting resistor R10, and the output end of the driving optocoupler is connected to the grid connection of the N-channel IGBT.
6. The motor relay protection device based on the double N-channel IGBT series connection is characterized in that the DSP control unit (5) comprises a digital signal processor, a current sensor for detecting three-phase current at the input end of the motor (4), a voltage sensor for detecting three-phase voltage at the input end of the motor (4), a first temperature sensor for detecting the operating temperature of the motor (4) and a second temperature sensor for detecting the operating temperature of the IGBT (2);
the output end of the current sensor and the output end of the voltage sensor are respectively connected with an A/D interface of the digital signal processor, the output end of the first temperature sensor is connected with a T-M interface of the digital signal processor, the second temperature sensor is connected with a T-NTC interface of the digital signal processor, and the input end of the digital signal processor is connected with the output end of the fault latch locking unit.
7. The motor relay protection device based on the double-N-channel IGBT series connection as claimed in any one of claims 1-6, wherein said plurality of N-channel IGBTs are respectively transistor Q1, transistor Q2, transistor Q3, transistor Q4, transistor Q5 and transistor Q6, transistor Q1 is connected in series with the common source of transistor Q2, transistor Q3 is connected in series with the common source of transistor Q4, transistor Q5 is connected in series with the common source of transistor Q6, the drain of transistor Q1, the drain of transistor Q3 and the drain of transistor Q3 are respectively connected with the output end of the frequency converter controlling the motor, and the drain of transistor Q2, the drain of transistor Q4 and the drain of transistor Q6 are respectively connected with the input end of the motor (4).
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Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1354561A (en) * | 2001-12-10 | 2002-06-19 | 深圳安圣电气有限公司 | Insulated gate bipolar transistor IGBT drive protection circuit |
| CN202550515U (en) * | 2012-04-01 | 2012-11-21 | 上海市电力公司 | High-power IGBT (insulated gate bipolar transistor) comprehensive overcurrent protection circuit |
| CN103036415A (en) * | 2011-09-29 | 2013-04-10 | 台达电子企业管理（上海）有限公司 | Power semiconductor switch series circuit and control method thereof |
| CN104283194A (en) * | 2013-07-05 | 2015-01-14 | 通用电气公司 | Circuit with fault protection function |
| CN204967246U (en) * | 2015-09-25 | 2016-01-13 | 江森自控空调冷冻设备(无锡)有限公司 | IGBT short circuit detects protection circuit and because IGBT's controllable rectifier circuit |
| CN106160624A (en) * | 2015-05-11 | 2016-11-23 | 英飞凌科技股份有限公司 | System and method for leggy buffer circuit |
| CN107453328A (en) * | 2017-08-11 | 2017-12-08 | 西门子公司 | Protection device and drive system |
| CN108767817A (en) * | 2018-05-24 | 2018-11-06 | 北京建工博海建设有限公司 | A kind of construction site temporary electricity accident warning device |
| CN208782462U (en) * | 2018-09-28 | 2019-04-23 | 张永健 | A kind of IGBT short-circuit protection circuit |
| CN110190838A (en) * | 2018-12-05 | 2019-08-30 | 徐州中矿大传动与自动化有限公司 | A kind of SiC MOSFET short-circuit protection circuit and method based on short circuit current inhibition |
| CN111095773A (en) * | 2017-09-21 | 2020-05-01 | 伊顿智能动力有限公司 | Soft starter AC-AC converter with integrated solid state circuit breaker and method of operating the same |
-
2020
- 2020-12-10 CN CN202011438242.0A patent/CN112670955A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1354561A (en) * | 2001-12-10 | 2002-06-19 | 深圳安圣电气有限公司 | Insulated gate bipolar transistor IGBT drive protection circuit |
| CN103036415A (en) * | 2011-09-29 | 2013-04-10 | 台达电子企业管理（上海）有限公司 | Power semiconductor switch series circuit and control method thereof |
| CN202550515U (en) * | 2012-04-01 | 2012-11-21 | 上海市电力公司 | High-power IGBT (insulated gate bipolar transistor) comprehensive overcurrent protection circuit |
| CN104283194A (en) * | 2013-07-05 | 2015-01-14 | 通用电气公司 | Circuit with fault protection function |
| CN106160624A (en) * | 2015-05-11 | 2016-11-23 | 英飞凌科技股份有限公司 | System and method for leggy buffer circuit |
| CN204967246U (en) * | 2015-09-25 | 2016-01-13 | 江森自控空调冷冻设备(无锡)有限公司 | IGBT short circuit detects protection circuit and because IGBT's controllable rectifier circuit |
| CN107453328A (en) * | 2017-08-11 | 2017-12-08 | 西门子公司 | Protection device and drive system |
| CN111095773A (en) * | 2017-09-21 | 2020-05-01 | 伊顿智能动力有限公司 | Soft starter AC-AC converter with integrated solid state circuit breaker and method of operating the same |
| CN108767817A (en) * | 2018-05-24 | 2018-11-06 | 北京建工博海建设有限公司 | A kind of construction site temporary electricity accident warning device |
| CN208782462U (en) * | 2018-09-28 | 2019-04-23 | 张永健 | A kind of IGBT short-circuit protection circuit |
| CN110190838A (en) * | 2018-12-05 | 2019-08-30 | 徐州中矿大传动与自动化有限公司 | A kind of SiC MOSFET short-circuit protection circuit and method based on short circuit current inhibition |
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