Self-adaptive DX40 permanent magnet circuit breaker driving guide module

Abstract

A self-adaptive DX40 permanent magnet circuit breaker driving guide module relates to the field of electricity, and comprises a 110 / 220 / 380V power supply, a 110 / 220 / 380V power supply to MCU power supply circuit, an isolation circuit and a main control chip which are connected in sequence, the main control chip sends a switching-on and switching-off output pulse signal to be isolated through a photoelectric coupler, the photoelectric coupler is connected with an IGBT full-bridge driving circuit, and the IGBT full-bridge driving circuit is connected with the isolation circuit. The IGBT full-bridge drive circuit is connected with the opening and closing coil. The 110 / 220 / 380V power supply is also connected with the energy storage capacitor, the energy storage capacitor is connected with the capacitance voltage detection circuit and the IGBT full-bridge drive circuit, and the capacitance voltage detection circuit is connected with the main control chip. According to the utility model, the permanent magnetic mechanisms of DC220V, DC110V and DC380V can be automatically identified and adapted, and the driver board does not need to be replaced according to the voltage.

Description

Technical Field

[0001] The utility model relates to the field of electricity, in particular to a driving guide module for permanent magnet mechanisms of different voltages. Background Art

[0002] The existing driving modules of permanent magnet circuit breaker operating mechanisms mostly adopt a single DC power supply standard output mode, and different permanent magnet mechanisms cannot be interchanged and used. In addition, they lack communication and intelligent design, and cannot set important time parameters such as the on-site opening and closing pulse time constant.

[0003] 1. It is impossible to achieve "one machine for multiple uses". For permanent magnet mechanisms with different voltages, the drive module of the corresponding voltage level must be replaced, and even the permanent magnet drive circuits with different capacitances require customized drive modules.

[0004] 2. The parameter configuration is cumbersome and not intelligent. The parameter configuration of the drive module is customized after leaving the factory. When the corresponding model specifications need to be queried during on-site modification or maintenance, it is often not completed in time due to confusion.

[0005] 3. Due to unreasonable circuit design, the permanent magnet drive module often fails, burns out and other faults occur from time to time. Utility Model Content

[0006] The purpose of the utility model is to overcome the deficiencies of the prior art and to provide an adaptive DX40 permanent magnet circuit breaker drive guide module, which can automatically identify permanent magnet mechanisms that adapt to DC220V, DC110V, and DC380V without replacing the drive board according to the voltage.

[0007] The purpose of the utility model is achieved as follows: an adaptive DX40 permanent magnet circuit breaker drive guide module includes a 110 / 220 / 380V power supply, a 110 / 220 / 380V power supply to MCU power supply circuit, an isolation circuit and a main control chip connected in sequence, the main control chip sends out a splitting and closing output pulse signal which is isolated through a photoelectric coupler, the photoelectric coupler is connected to an IGBT full-bridge drive circuit, and the IGBT full-bridge drive circuit is connected to a splitting and closing coil; the 110 / 220 / 380V power supply is also connected to an energy storage capacitor, the energy storage capacitor is connected to a capacitor voltage detection circuit and an IGBT full-bridge drive circuit, and the capacitor voltage detection circuit is connected to the main control chip.

[0008] Preferably, the IGBT full-bridge drive circuit includes a first IGBT, a second IGBT, a third IGBT, a fourth IGBT, a second drive chip and a fifth drive chip; the photoelectric coupler includes a first photoelectric coupler, a third photoelectric coupler, a fourth photoelectric coupler and a sixth photoelectric coupler; the signal input ends of the first photoelectric coupler, the third photoelectric coupler, the fourth photoelectric coupler and the sixth photoelectric coupler are all connected to the main control chip; the signal output ends of the first photoelectric coupler and the third photoelectric coupler are all connected to the second drive chip, and the signal output ends of the fourth photoelectric coupler and the sixth photoelectric coupler are all connected to the fifth drive chip; the gate of the first IGBT is connected to the second drive chip, the emitter of the first IGBT, the second drive chip, the collector of the second IGBT, one end of the opening and closing coil, and one end of the eleventh capacitor are connected, and the collector of the first IGBT is connected to the energy storage capacitor The gate of the second IGBT is connected to the second driving chip, and the emitter of the second IGBT is connected to 110_GND; the gate of the third IGBT is connected to the fifth driving chip, the emitter of the third IGBT, the fifth driving chip, the collector of the fourth IGBT, the other end of the opening and closing coil, and one end of the second capacitor are connected, and the collector of the third IGBT is connected to the energy storage capacitor; the gate of the fourth IGBT is connected to the fifth driving chip, and the emitter of the fourth IGBT is connected to 110_GND; the other end of the eleventh capacitor is connected to the cathode of the first diode, and the first diode is connected to the second driving chip in parallel; the other end of the second capacitor is connected to the cathode of the second diode, and the second diode is connected to the fifth driving chip in parallel; transient suppression diodes are connected between the gates and emitters of the first IGBT, the second IGBT, the third IGBT, and the fourth IGBT.

[0009] Preferably, the capacitor voltage detection circuit includes a first operational amplifier and a second operational amplifier connected to the energy storage capacitor, the first operational amplifier is connected to the seventeenth optocoupler, the seventeenth optocoupler is connected to the third operational amplifier, and the third operational amplifier is connected to the main control chip; the second operational amplifier is connected to the nineteenth optocoupler, the nineteenth optocoupler is connected to the fourth operational amplifier, and the fourth operational amplifier is connected to the main control chip.

[0010] Preferably, first drive resistors are connected in series to the gates of the first IGBT, the second IGBT, the third IGBT and the fourth IGBT, wherein two first drive resistors are connected to the second drive chip, and the other two first drive resistors are connected to the fifth drive chip.

[0011] Preferably, a ceramic capacitor is connected between the gate and emitter of the first IGBT, the second IGBT, the third IGBT and the fourth IGBT.

[0012] Preferably, the gates of the first IGBT, the second IGBT, the third IGBT and the fourth IGBT are all connected to a driving circuit, wherein the other ends of two driving circuits are connected to the second driving chip, and the other ends of the other two driving circuits are connected to the fifth driving chip; the driving circuit includes a second driving resistor, a third diode, a third driving resistor and a fourth diode, the second driving resistor and the third diode are connected in series to form a first driving circuit, the third driving resistor and the fourth diode are connected in series to form a second driving circuit, and the first driving circuit is connected in parallel to the second driving circuit.

[0013] Preferably, a non-inductive CBB small capacitor is connected between the collector and the emitter of the first IGBT, the second IGBT, the third IGBT and the fourth IGBT.

[0014] Preferably, the first IGBT, the second IGBT, the third IGBT and the fourth IGBT all include a gate, a collector and an emitter, and a fourth drive resistor, a fifth diode and a buffer capacitor are arranged between each collector and the emitter, one end of the fourth drive resistor connected in parallel with the fifth diode is connected to one end of the buffer capacitor, the other end of the buffer capacitor is connected to the emitter, and the other end of the fourth drive resistor connected in parallel with the fifth diode is connected to the collector.

[0015] Preferably, the 110 / 220 / 380V power supply to MCU power supply circuit includes an ACDC power supply module, the ACDC power supply module is connected in parallel with pins 2 and 4 of the common mode inductor, one end of the parallel connection is connected to the thirty-seventh capacitor, the other end of the parallel connection is connected to the thirty-eighth capacitor, the other end of the thirty-seventh capacitor is connected to the other end of the thirty-eighth capacitor and then grounded; pins 3 and 1 of the common mode inductor are connected in parallel with the varistor, one end of the parallel connection is connected to the fuse and the other end is connected to the power ground, and the other end of the fuse is connected to the 110 / 220 / 380V power supply; the ACDC power supply module is also connected to the input pin of the linear regulator, the output pin of the linear regulator is connected to the second magnetic bead and the fourth magnetic bead, the second magnetic bead and the fourth magnetic bead are connected to the filter circuit, and the filter circuit is connected to the isolation circuit.

[0016] Preferably, the main control chip is an STM32F103C8T6 chip; the second driver chip and the fifth driver chip are both IR2104 chips.

[0017] The beneficial effects of the utility model are:

[0018] 1. It can adapt to the driving requirements of permanent magnet mechanisms with different voltage levels and different capacitances, without replacing driver boards of different specifications, and can realize remote monitoring, parameter setting and other functions through host computer tools or remote communication. It truly realizes the "hardware unification" of permanent magnet drive modules, making on-site maintenance more convenient.

[0019] 2. Eliminate Miller oscillation of IGBT to avoid IGBT tube explosion.

[0020] 3. In order to make the controller work normally in harsh environment, the electromagnetic compatibility design of the system is considered during the circuit design process to ensure that the system does not have false triggering, reset, destructive discharge and other phenomena, so that the prototype meets the electromagnetic compatibility requirements specified in the standard. In the hardware design, consider the following three points to enhance the system's anti-interference ability to ensure the reliability of the hardware system.

[0021] (1) In the adaptation of the three 110 / 220 / 380V voltage conversion circuits, there are corresponding filter circuits and shielding and grounding issues are considered.

[0022] AP0512N10 is an ACDC power module with an input of 85V--265VAC / 100V--400VDC. It can adapt to the three DC voltages of 110 / 220 / 380V of the utility model. It has its own lightning protection circuit, EMC filter circuit, output differential filter, etc. It has good electromagnetic compatibility characteristics and an isolation voltage of 3000VAC. The output accuracy reaches plus or minus 1%.

[0023] HC+ / TC+ can input DC 110 / 220 / 380V voltage, F1 is a 2A / 500A fuse, RV1 is a varistor to prevent surge, L4 is an input common mode inductor, which attenuates the common mode current to achieve the purpose of filtering. FB2 / FB4 are magnetic beads used to suppress EMI differential mode noise interference, and the rest are filter capacitors. EGND is connected to the chassis ground, and the chassis ground is connected to the earth, which can effectively shield external electromagnetic interference. S1 is an AMS1117-3.3V linear regulator, which converts DC5V into DC3.3V.

[0024] (2) The weak current control part and the strong current circuit are all electrically isolated by using photocouplers (U1, U3, U4, U6).

[0025] (3) Design a surge suppression circuit to enhance surge immunity. For example, add a transient voltage suppressor (TVS, D6, D7, D8, D9) between the IGBT gate G and the emitter E. This diode has an extremely fast response time and a fairly high surge absorption capacity, which can protect the IGBT gate from the impact of transient high-voltage spike pulses and ensure the safe operation of the IGBT. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a principle block diagram of the utility model;

[0027] Figure 2It is the circuit diagram of IGBT full-bridge driving circuit and photocoupler;

[0028] Figure 3 This is the internal diagram of the existing IGBT;

[0029] Figure 4 This is a first schematic diagram of the IGBT of the utility model;

[0030] Figure 5 This is a second schematic diagram of the IGBT of the utility model;

[0031] Figure 6 This is a third schematic diagram of the IGBT of the utility model;

[0032] Figure 7 This is a fourth schematic diagram of the IGBT of the utility model;

[0033] Figure 8 for Figure 1 Circuit diagram of the capacitor voltage detection circuit;

[0034] Fig. 9 for Figure 1 Schematic diagram of the main control chip;

[0035] Fig.10 for Figure 1 Circuit diagram of 110 / 220 / 380V power supply to MCU power supply circuit.

[0036] In the figure, 1. 110 / 220 / 380V power supply, 2. capacitor voltage detection circuit, 3. opening and closing coil, 4. IGBT full-bridge drive circuit, 5. energy storage capacitor, 6. photocoupler, 7. opening and closing output pulse signal, 8. 110 / 220 / 380V power supply to MCU power supply circuit, 9. isolation circuit, 10. main control chip, 11. manual opening and closing signal, 12. fault alarm light, 13. reserved RS232 interface, and 14 filtering circuit. DETAILED DESCRIPTION

[0037] like Figure 1 As shown, it includes a 110 / 220 / 380V power supply 1, a 110 / 220 / 380V power supply to MCU power supply circuit 8, an isolation circuit 9 and a main control chip 10 connected in sequence. The main control chip 10 sends out a splitting and closing output pulse signal 7 which is isolated through a photoelectric coupler 6. The photoelectric coupler 6 is connected to an IGBT full-bridge drive circuit 4, and the IGBT full-bridge drive circuit 4 is connected to a splitting and closing coil 3. The 110 / 220 / 380V power supply 1 is also connected to an energy storage capacitor 5, and the energy storage capacitor 5 is connected to a capacitor voltage detection circuit 2 and an IGBT full-bridge drive circuit 4, and the capacitor voltage detection circuit 2 is connected to the main control chip 10.

[0038] The main control chip 10 is an STM32F103C8T6 chip, which is an ARM Cortex-M4 32-bit MCU with a floating point unit (FPU), 14 timers, and is equipped with an LCD controller interface and an Ethernet interface, 3 24-channel 12-bit A / D converters, 2 D / A converters, built-in sampling and holding, 15 communication interfaces, and a variety of peripherals that can meet the needs of the utility model. Fault alarms, rapid opening and closing, and other operations can be controlled through the host computer.

[0039] The 110V, 220V, and 380V DC power supplies are converted into the 5V and 3.3V DC power supplies required by the STM32F103C8T6 chip, and then the STM32F103C8T6 chip is powered by an isolation circuit. When the MCU gives a closing / opening signal, it is isolated through a photocoupler, and the DC110V, DC220V, and DC380V DC charges the energy storage capacitor 5. The IGBT full-bridge drive circuit 4 performs the closing and opening actions after receiving the signal from the MCU. The capacitor voltage detection circuit 2 detects the voltage on the capacitor. When the voltage is lower than a certain value, it will not be allowed to operate to prevent affecting the normal operation of the power grid.

[0040] like Figure 2 As shown, the IGBT full-bridge drive circuit 4 includes a first IGBT tube Q1, a second IGBT tube Q2, a third IGBT tube Q3, a fourth IGBT tube Q4, a second drive chip U2 and a fifth drive chip U5. The second drive chip U2 and the fifth drive chip U5 both use IR2104 chips.

[0041] The photoelectric coupler 6 includes a first photoelectric coupler U1, a third photoelectric coupler U3, a fourth photoelectric coupler U4, and a sixth photoelectric coupler U6. The signal input ends of the first photoelectric coupler U1, the third photoelectric coupler U3, the fourth photoelectric coupler U4, and the sixth photoelectric coupler U6 are all connected to the main control chip 10. The signal output ends of the first photoelectric coupler U1 and the third photoelectric coupler U3 are all connected to the second driver chip U2, and the signal output ends of the fourth photoelectric coupler U4 and the sixth photoelectric coupler U6 are all connected to the fifth driver chip U5.

[0042] The gate of the first IGBT tube Q1 is connected to the second driving chip U2, the emitter of the first IGBT tube Q1, the second driving chip U2, the collector of the second IGBT tube Q2, one end of the opening and closing coil 3, and one end of the eleventh capacitor C11 are connected, and the collector of the first IGBT tube Q1 is connected to the energy storage capacitor 5. The gate of the second IGBT tube Q2 is connected to the second driving chip U2, and the emitter of the second IGBT tube Q2 is connected to 110_GND.

[0043] The gate of the third IGBT tube Q3 is connected to the fifth drive chip U5, the emitter of the third IGBT tube Q3, the fifth drive chip U5, the collector of the fourth IGBT tube Q4, the other end of the opening and closing coil 3, and one end of the second capacitor C2 are connected, and the collector of the third IGBT tube Q3 is connected to the energy storage capacitor 5. The gate of the fourth IGBT tube Q4 is connected to the fifth drive chip U5, and the emitter of the fourth IGBT tube Q4 is connected to 110_GND.

[0044] The other end of the eleventh capacitor C11 is connected to the cathode of the first diode D1, which is connected in parallel with the second driver chip U2. The other end of the second capacitor C2 is connected to the cathode of the second diode D2, which is connected in parallel with the fifth driver chip U5.

[0045] A sixth transient suppression diode D6 is connected between the gate and emitter of the first IGBT tube Q1, a sixth transient suppression diode D7 is connected between the gate and emitter of the second IGBT tube Q2, an eighth transient suppression diode D8 is connected between the gate and emitter of the third IGBT tube Q3, and a ninth transient suppression diode D9 is connected between the gate and emitter of the fourth IGBT tube Q4.

[0046] IR2104 is a high-voltage, high-speed power MOSFET high and low-side driver chip, and its maximum operating voltage can reach +700V. The utility model uses two IR2104 (U2, U5) to form a new full-bridge drive circuit, referred to as "H" bridge, to drive the switch control of 4 IGBTs. When the MCU module sends 1 to Hin1 and Lin2 sends 0, U2 relies on the bootstrap capacitor C11 as a floating voltage source to drive Q1, and L0 of U5 is lifted from the original floating to the chip power supply potential and COM to generate the conduction voltage VCC, so that Q4 is also turned on. When the MCU module sends 0 to Lin1 and Hin2 sends 1, L0 of U2 is lifted from the original floating to the chip power supply potential and COM to generate the conduction voltage VCC, so that Q3 is turned on, and U5 relies on the bootstrap capacitor C2 as a floating voltage source to drive Q3 to operate.

[0047] The four optocouplers (U1, U3, U4, U6) can achieve optoelectronic isolation, shield various high-frequency signal interferences, and ensure the stability of the circuit.

[0048] The IGBT insulated gate bipolar transistor (IGBT) control opening and closing circuit is the core part of the controller. The opening and closing operation of the circuit breaker is realized by controlling the current direction using a full-bridge circuit composed of 4 IGBTs. The G40T120AK3S high-power IGBT selected in this utility model has a withstand voltage of 1.2kV, a current of 80A, a collector-emitter breakdown voltage (Vces): 1.2kV, a collector current (Ic): 80A, and a power (Pd): 333W. Figure 2 As shown, the four IGBTs form a full-bridge structure. When the main control MCU module sends an opening or closing pulse signal, the corresponding two IGBTs on the diagonal are turned on to control the energy storage capacitor-coil loop to be instantly turned on, and the moving iron core moves under the action of the coil magnetic force, thereby realizing the opening and closing functions.

[0049] When the main control chip sends out a closing pulse signal, the second photocoupler U2 receives the closing pulse signal, controls the two closing IGBT tubes Q1 and Q4 to turn on, and the other two Q3 and Q2 to turn off. The closing current flows according to the external energy storage capacitor → Q1 → opening and closing coil → Q4 → GND loop, providing the permanent magnet coil with an instantaneous pulse large current to achieve the closing function. Similarly, when the main control chip sends out an opening pulse signal, the fifth photocoupler U5 receives the opening pulse signal, Q1 and Q4 are turned off, Q2 and Q3 are turned on, and the opening current flows according to the energy storage capacitor → Q2 → opening and closing coil → Q3 → GND loop, providing the opening and closing coil with an instantaneous reverse pulse current to achieve the opening function. It can meet the requirements of DC110V to DC380V capacitor voltage, adapt to permanent magnet mechanisms of different voltage levels, and adapt to peak currents up to 80A. For the permanent magnet mechanism for 10kV circuit breakers and the permanent magnet mechanism for 35kV circuit breakers, all are "one machine for all", avoiding the problem of numerous, complex and incompatible models of traditional permanent magnet drive boards.

[0050] like Figure 8 As shown, the capacitor voltage detection circuit 2 includes a seventy-third resistor R73 and a seventy-seventh resistor R77 connected to the energy storage capacitor 5, the other end of the seventy-third resistor R73, the seventy-fifth resistor R75, and the 3rd pin of the first operational amplifier U15A are connected, and the other end of the seventy-fifth resistor R75 and the 4th pin of the first operational amplifier U15A are connected to 12V_GND. The 1st pin of the first operational amplifier U15A is connected to the seventy-fourth resistor R74, and the other end of the seventy-fourth resistor R74 is connected to the seventeenth optical coupler U17, the seventeenth optical coupler U17 is connected to the third operational amplifier U16B, and the third operational amplifier U16B is connected to the main control chip 10.

[0051] The other end of the seventy-seventh resistor R77, the seventy-ninth resistor R79, and the 5th pin of the second operational amplifier U15B are connected, and the other end of the seventy-ninth resistor R79 and the 4th pin of the second operational amplifier U15B are connected to 12V_GND. The 7th pin of the second operational amplifier U15B is connected to the seventy-eighth resistor R78, and the other end of the seventy-eighth resistor R78 is connected to the nineteenth optical coupler U19, and the nineteenth optical coupler U19 is connected to the fourth operational amplifier U16A, and the fourth operational amplifier U16A is connected to the main control chip 10.

[0052] In order to prevent the failure of the circuit breaker opening and closing operation due to insufficient capacitor energy and affect the normal operation of the power grid, the equipment must measure the voltage of the energy storage capacitor before opening and closing. When the capacitor voltage value is lower than 170V, the MCU outputs the capacitor low voltage lockout and cannot open and close the circuit breaker; when the capacitor voltage is higher than 185 V, the MCU releases the capacitor low voltage lockout and allows opening and closing operations. The default maximum voltage of the energy storage capacitor is DC 220 V, which can be set according to the actual permanent magnet mechanism.

[0053] HC+ and TC+ can set three different DC voltages of DC110V, DC220V, and DC380V respectively. Then R75 and R79 can change the voltage at points A and B by adjusting their resistance using sliding rheostats, so that the input voltage Ui of the capacitor voltage detection circuit is controlled within the range of 0 to 5V. U15 and U16 of the utility model use LM258 operational amplifiers, and U17 and U19 are optocouplers EL357 that play an isolation role and are current-driven devices with an operating current Iq of 5 to 20 mA, so R74 and R78 can be set to 1K at the same time. Subsequently, the control current of the optocoupler is calculated, and then the voltages of CE1 and CE2 are calculated based on the control current.

[0054] Taking into account that capacitors provide different DC voltages, the Miller capacitance of the IGBT tube must be considered when designing DC110V, DC220V, and DC380V. This is because the Miller platform and Miller oscillation of the IGBT tube will be generated when dealing with different DC voltages. Severe Miller oscillation will cause a high switching speed, resulting in the tube bursting. Once an IGBT tube has a problem, the other tubes cannot withstand it, resulting in damage to all four IGBT tubes. Therefore, this design fully considers the impact of the Miller capacitance when dealing with three different DC voltages of DC110V, DC220V, and DC380V, thereby designing a "one machine for all", avoiding the problem of numerous, complex and incompatible models of traditional permanent magnet drive boards.

[0055] When the input resistance is large, the switching speed is slow, such as Figure 3The effect of the integral capacitor Cgd shown in the figure is not obvious, but once the switching speed is high and the external power supply voltage is high, at DC380, the current passing through Cgd is relatively large, and the strong integral can easily cause oscillation, which is called Miller oscillation. Therefore, Cgd is also called Miller capacitor, because the feedback of the tube introduces a capacitor, this capacitor is large enough, and the front-end signal changes quickly, and the back-end voltage is high enough, the combination of the three will cause integral overcharge oscillation.

[0056] There are four ways to solve Miller shock:

[0057] In the first type, the gates of the first IGBT tube Q1, the second IGBT tube Q2, the third IGBT tube Q3, and the fourth IGBT tube Q4 are all connected in series with a first drive resistor, two of which are connected to the second drive chip U2, and the other two are connected to the fifth drive chip U5. A ceramic capacitor is connected between the gate and emitter of the first IGBT tube Q1, the second IGBT tube Q2, the third IGBT tube Q3, and the fourth IGBT tube Q4.

[0058] Take the first IGBT tube Q1 as an example. Figure 4 As shown, the first driving resistor R6 is connected in series with the gate of the first IGBT tube Q1, and the ceramic capacitor C100 is connected between the gate and the emitter of the first IGBT tube Q1. The resistance of the first driving resistor R6 is between 1 and 100 ohms. The specific value depends on the characteristics of the MOS tube and the operating frequency. The larger the resistance, the slower the switching speed. The ceramic capacitor C100 is connected in parallel between the gate and the emitter of the first IGBT tube Q1, and the general capacity is around 1nF~10nF. Adjust the capacitance value, increase the capacitance, reduce the charging and discharging time, and slow down the edge speed of the switch. This method is particularly suitable for hard switching circuits and eliminates oscillations caused by hard switching.

[0059] The second type, such as Figure 5 As shown, the gates of the first IGBT tube Q1, the second IGBT tube Q2, the third IGBT tube Q3, and the fourth IGBT tube Q4 are all connected to the drive circuit, wherein the other ends of the two drive circuits are connected to the second drive chip U2, and the other ends of the other two drive circuits are connected to the fifth drive chip U5. The drive circuit includes a second drive resistor R100, a third diode D3, a third drive resistor R101, and a fourth diode D4. The second drive resistor R100 and the third diode D3 are connected in series to form a first drive circuit, and the third drive resistor R101 and the fourth diode D4 are connected in series to form a second drive circuit. The first drive circuit is connected in parallel with the second drive circuit. The shutdown capability of the IGBT tube is enhanced, and the differentiated charge and discharge speed uses a diode to accelerate the discharge speed.

[0060] The third type, such as Figure 6As shown, the first IGBT tube Q1, the second IGBT tube Q2, the third IGBT tube Q3, and the fourth IGBT tube Q4 all include a gate, a collector, and an emitter, and a fourth drive resistor R102, a fifth diode D5, and a buffer capacitor C101 are arranged between each collector and the emitter, and one end of the fourth drive resistor R102 connected in parallel with the fifth diode D5 is connected to one end of the buffer capacitor C101, and the other end of the buffer capacitor C101 is connected to the emitter, and one end of the fourth drive resistor R102 connected in parallel with the fifth diode D5 is connected to the collector. The IGBT tube RCD buffer circuit is conducive to protecting the IGBT tube from DS breakdown due to excessive voltage generated when it is turned off, and is also helpful for Miller oscillation.

[0061] The fourth type, such as Figure 7 As shown, a first non-inductive CBB small capacitor C102 is connected between the collector and emitter of the first IGBT tube Q1; a second non-inductive CBB small capacitor C104 is connected between the collector and emitter of the second IGBT tube Q2; a third non-inductive CBB small capacitor C103 is connected between the collector and emitter of the third IGBT tube Q3; and a fourth non-inductive CBB small capacitor C105 is connected between the collector and emitter of the fourth IGBT tube Q4. Adding DS capacitors In the ZVS soft switching circuit, non-inductive CBB small capacitors are connected in parallel between the IGBT tubes DS. Generally, the capacity is within 10nF and cannot be too large, which is conducive to Miller oscillation.

[0062] like Fig. 9 As shown, the main control chip 10 communication and human-computer interaction module uses STM32f103C8T6 as the processor, which mainly realizes GPRS communication, Ethernet communication, OLCD / LED status display button setting, and reserves a local RS232 / 485 interface. The RS232 serial port communication is used between the main control MCU, making the permanent magnet drive module more intelligent, supporting remote host computer parameter reading and writing, status monitoring, and the peripheral device provides the MCU main control chip with a crystal oscillator and a 3.3V filter capacitor circuit.

[0063] like Fig.10As shown, the 110 / 220 / 380V power supply to MCU power supply circuit 8 includes an ACDC power supply module P3, which is connected in parallel with the 2nd and 4th pins of the common mode inductor L4, one end of which is connected in parallel to the 37th capacitor C37, and the other end of which is connected in parallel to the 38th capacitor C38, and the other end of which is connected in parallel to the other end of the 38th capacitor C38 and then connected to the ground EGND. The 3rd and 1st pins of the common mode inductor L4 are connected in parallel with the varistor RV1, one end of which is connected in parallel to the fuse F1 and the other end is connected to the power ground 110_GND, and the other end of the fuse F1 is connected to the 110 / 220 / 380V power supply 1. The ACDC power supply module P3 is also connected to the input pin of the linear regulator S1, and the output pin of the linear regulator S1 is connected to the second magnetic bead FB2 and the fourth magnetic bead FB4, and the second magnetic bead FB2 and the fourth magnetic bead FB4 are connected to the filter circuit 14, and the filter circuit 14 is connected to the isolation circuit 9.

[0064] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. Adaptive DX40 permanent magnetic circuit breaker drive guide module, its characteristics are: The invention comprises a 110 / 220 / 380V power supply (1), a 110 / 220 / 380V power supply to MCU power supply circuit (8), an isolation circuit (9) and a main control chip (10) which are connected in sequence. The main control chip (10) sends out a switch-on and switch-off output pulse signal (7) which is isolated through a photoelectric coupler (6). The photoelectric coupler (6) is connected to an IGBT full-bridge drive circuit (4). The IGBT full-bridge drive circuit (4) is connected to a switch-on and switch-off coil (3). The 110 / 220 / 380V power supply (1) is also connected to an energy storage capacitor (5). The energy storage capacitor (5) is connected to a capacitor voltage detection circuit (2) and an IGBT full-bridge drive circuit (4). The capacitor voltage detection circuit (2) is connected to the main control chip (10).

2. The adaptive DX40 permanent magnetic circuit breaker drive guide module according to claim 1 is characterized in that: The IGBT full-bridge drive circuit (4) comprises a first IGBT (Q1), a second IGBT (Q2), a third IGBT (Q3), a fourth IGBT (Q4), a second drive chip (U2) and a fifth drive chip (U5); The photoelectric coupler (6) comprises a first photoelectric coupler (U1), a third photoelectric coupler (U3), a fourth photoelectric coupler (U4), and a sixth photoelectric coupler (U6); the signal input ends of the first photoelectric coupler (U1), the third photoelectric coupler (U3), the fourth photoelectric coupler (U4), and the sixth photoelectric coupler (U6) are all connected to a main control chip (10); the signal output ends of the first photoelectric coupler (U1) and the third photoelectric coupler (U3) are all connected to a second drive chip (U2), and the signal output ends of the fourth photoelectric coupler (U4) and the sixth photoelectric coupler (U6) are all connected to a fifth drive chip (U5); The gate of the first IGBT (Q1) is connected to the second drive chip (U2), the emitter of the first IGBT (Q1), the second drive chip (U2), the collector of the second IGBT (Q2), one end of the opening and closing coil (3), and one end of the eleventh capacitor (C11) are connected, and the collector of the first IGBT (Q1) is connected to the energy storage capacitor (5); the gate of the second IGBT (Q2) is connected to the second drive chip (U2), and the emitter of the second IGBT (Q2) is connected to 110_GND; The gate of the third IGBT (Q3) is connected to the fifth drive chip (U5); the emitter of the third IGBT (Q3), the fifth drive chip (U5), the collector of the fourth IGBT (Q4), the other end of the opening and closing coil (3), and one end of the second capacitor (C2) are connected; the collector of the third IGBT (Q3) is connected to the energy storage capacitor (5); the gate of the fourth IGBT (Q4) is connected to the fifth drive chip (U5), and the emitter of the fourth IGBT (Q4) is connected to 110_GND; The other end of the eleventh capacitor (C11) is connected to the cathode of the first diode (D1), and the first diode (D1) is connected in parallel with the second driver chip (U2); the other end of the second capacitor (C2) is connected to the cathode of the second diode (D2), and the second diode (D2) is connected in parallel with the fifth driver chip (U5); Transient suppression diodes are connected between the gates and emitters of the first IGBT (Q1), the second IGBT (Q2), the third IGBT (Q3), and the fourth IGBT (Q4).

3. The adaptive DX40 permanent magnetic circuit breaker drive guide module according to claim 1 is characterized in that: The capacitor voltage detection circuit (2) comprises a first operational amplifier (U15A) and a second operational amplifier (U15B) connected to the energy storage capacitor (5); the first operational amplifier (U15A) is connected to a seventeenth optical coupler (U17), the seventeenth optical coupler (U17) is connected to a third operational amplifier (U16B), and the third operational amplifier (U16B) is connected to a main control chip (10); the second operational amplifier (U15B) is connected to a nineteenth optical coupler (U19), the nineteenth optical coupler (U19) is connected to a fourth operational amplifier (U16A), and the fourth operational amplifier (U16A) is connected to the main control chip (10).

4. The adaptive DX40 permanent magnet circuit breaker drive guide module according to claim 2 is characterized in that: The gates of the first IGBT (Q1), the second IGBT (Q2), the third IGBT (Q3), and the fourth IGBT (Q4) are all connected in series with a first driving resistor, two of which are connected to the second driving chip (U2), and the other two are connected to the fifth driving chip (U5).

5. The adaptive DX40 permanent magnetic circuit breaker drive guide module according to claim 4 is characterized in that: A ceramic capacitor is connected between the gate and emitter of the first IGBT (Q1), the second IGBT (Q2), the third IGBT (Q3), and the fourth IGBT (Q4).

6. The adaptive DX40 permanent magnet circuit breaker drive guide module according to claim 2 is characterized in that: The gates of the first IGBT (Q1), the second IGBT (Q2), the third IGBT (Q3), and the fourth IGBT (Q4) are all connected to a drive circuit, wherein the other ends of two drive circuits are connected to a second drive chip (U2), and the other ends of the other two drive circuits are connected to a fifth drive chip (U5); the drive circuit comprises a second drive resistor, a third diode, and a third drive resistor and a fourth diode, wherein the second drive resistor and the third diode are connected in series to form a first drive circuit, the third drive resistor and the fourth diode are connected in series to form a second drive circuit, and the first drive circuit and the second drive circuit are connected in parallel.

7. The adaptive DX40 permanent magnet circuit breaker drive guide module according to claim 2 is characterized in that: A non-inductive CBB small capacitor is connected between the collector and the emitter of the first IGBT (Q1), the second IGBT (Q2), the third IGBT (Q3), and the fourth IGBT (Q4).

8. The adaptive DX40 permanent magnetic circuit breaker drive guide module according to claim 2 is characterized by: The first IGBT (Q1), the second IGBT (Q2), the third IGBT (Q3), and the fourth IGBT (Q4) all include a gate, a collector, and an emitter. A fourth driving resistor, a fifth diode, and a buffer capacitor are arranged between each collector and the emitter. One end of the fourth driving resistor connected in parallel with the fifth diode is connected to one end of the buffer capacitor, the other end of the buffer capacitor is connected to the emitter, and the other end of the fourth driving resistor connected in parallel with the fifth diode is connected to the collector.

9. The adaptive DX40 permanent magnetic circuit breaker drive guide module according to claim 1 is characterized in that: The 110 / 220 / 380V power supply to MCU power supply circuit (8) comprises an ACDC power supply module (P3), wherein the ACDC power supply module (P3) is connected in parallel with the 2nd and 4th pins of the common mode inductor (L4), one end of which is connected in parallel with the thirty-seventh capacitor (C37), and the other end of which is connected in parallel with the thirty-eighth capacitor (C38), and the other end of the thirty-seventh capacitor (C37) is connected to the other end of the thirty-eighth capacitor (C38) and then grounded (EGND); the 3rd and 1st pins of the common mode inductor (L4) are connected in parallel with the varistor (RV1), and One end of the connected circuit is connected to a fuse (F1) and the other end is connected to a power ground (110_GND); the other end of the fuse (F1) is connected to a 110 / 220 / 380V power supply (1); the ACDC power supply module (P3) is also connected to an input pin of a linear regulator (S1); the output pin of the linear regulator (S1) is connected to a second magnetic bead (FB2) and a fourth magnetic bead (FB4); the second magnetic bead (FB2) and the fourth magnetic bead (FB4) are connected to a filter circuit (14); and the filter circuit (14) is connected to the isolation circuit (9).

10. The adaptive DX40 permanent magnetic circuit breaker drive guide module according to claim 2 is characterized in that: The main control chip (10) is an STM32F103C8T6 chip; the second drive chip (U2) and the fifth drive chip (U5) both use IR2104 chips.

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