Dual-redundancy direct-current motor control system

Abstract

The utility model discloses a dual-redundancy direct-current motor control system, which comprises a main system and an emergency starting system, the emergency starting system comprises a power supply conversion module, a system voltage acquisition module, an armature voltage acquisition module, an excitation current acquisition module, a starting control module, a soft start contactor control module, a PWM signal conversion module, an IGBT driving and protection module, a bypass switching control module, a shutdown control module and an excitation loss protection module. And the self-checking unit in the main system is connected with the power conversion module in the emergency starting system. The dual-redundancy direct-current motor control system has the advantages of high stability, high efficiency and high reliability.

Description

Technical Field

[0001] The utility model relates to the field of emergency starting units, in particular to a dual-redundancy DC motor control system. Background Art

[0002] DC motors have good starting, braking and speed regulation performance. Compared with AC motors, they also have advantages such as large starting torque, high speed, stable and reliable power supply, etc. Therefore, DC motors are widely used in large reversible rolling mills, urban trams, subway trains, printing machinery, marine machinery, large precision machine tools and other production machinery. At the same time, because the power supply of DC motors is storable, they can also be used in various backup protection and emergency equipment.

[0003] However, the starting impact current of DC motors is large, and the direct starting impact current can even reach 10-20 times the rated current. Therefore, the starting current of DC motors needs to be limited. Otherwise, the excessive starting impact current will not only affect the life of the DC power supply, but also affect other electrical equipment in the same section of the bus. Utility Model Content

[0004] The utility model aims to provide a dual-redundancy DC motor control system which has the advantages of not only high stability but also high efficiency and high reliability.

[0005] To achieve the above-mentioned purpose, the utility model provides a dual redundant DC motor control system, including a main system and an emergency starting system, wherein the emergency starting system includes a power conversion module, a system voltage acquisition module, an armature voltage acquisition module, an excitation current acquisition module, a starting control module, a soft start contactor control module, a PWM signal conversion module, an IGBT drive and protection module, a bypass switching control module, a shutdown control module and a demagnetization protection module; the self-test unit in the main system is connected to the power conversion module in the emergency starting system.

[0006] Preferably, the power conversion module is provided with a fuse F1, a thermistor NTC1, a power module POWER1, a DC12V power supply, a power module POWER2 and a DC5V power supply, the fuse F1 is connected to the thermistor NTC1, the other side of the thermistor NTC1 is connected to the power module POWER1, the other side of the power module POWER1 is connected to the DC12V power supply, and the DC12V power supply is converted into a DC5V power supply through the power module POWER2.

[0007] Preferably, the system voltage acquisition module includes a power module B1V1, an operational amplifier U1, current limiting resistors R2-R6, current limiting resistors R13-R17, resistor R7, capacitor C7, capacitor C8, diode D1, diode D2, operational amplifier U3 and operational amplifier U2, the current limiting resistors R2-R6 and current limiting resistors R13-R17 are connected to capacitor C7, the capacitor C7, capacitor C8 and resistor R7 are connected, the capacitor C8 is connected to diode D1 and diode D2, the diode D2 is connected to operational amplifier U3, the operational amplifier U3 is connected to operational amplifier U2, and the operational amplifier U2 is connected to operational amplifier U1.

[0008] Preferably, the armature voltage acquisition module is provided with a power supply module B1V5, an operational amplifier U6, current limiting resistors R21-R25, current limiting resistors R34-R38, resistor R26, resistor C16, capacitor C17, diode D5, diode D6, operational amplifier U5 and operational amplifier U4, the current limiting resistors R21-R25 and current limiting resistors R34-R38 are connected to capacitor C16, the capacitor C16 and capacitor C17 are connected to resistor R26, the capacitor C17 is connected to diode D5 and diode D6, the diode D6 is connected to operational amplifier U6, the operational amplifier U6 is connected to operational amplifier U5, and the operational amplifier U5 is connected to operational amplifier U4.

[0009] Preferably, the excitation current acquisition module is provided with a power supply module B1V3, an operational amplifier U11, a resistor R53, an operational amplifier U10, and an operational amplifier U9. The operational amplifier U11 is connected to a diode D8 and a diode D9, one side of the operational amplifier U11 is connected to the operational amplifier U10, and one side of the operational amplifier U10 is connected to the operational amplifier U9.

[0010] Preferably, the startup control module is provided with relay HF10, relay HF2, relay HF12, drive optocoupler GT1, gate UY1, and comparator U8, the drive optocoupler GT1 is connected to gate UY1, the comparator U8 is connected to gate UY1, and the gate UY1 is connected to relay HF2 and relay HF12.

[0011] Preferably, the soft start contactor control module is provided with an operational amplifier U12, a gate UY2, a transistor Q5, and a relay HF4, the operational amplifier U12 is connected to the gate UY2, the gate UY2 and the transistor Q5 are turned on, and the gate UY2 is connected to the relay HF4.

[0012] Preferably, the PWM signal conversion module is provided with an APC chip U16, a signal conditioning chip U17, and a capacitor C57, and the APC chip U16 is connected to the signal conditioning chip U17 via the capacitor C57.

[0013] Preferably, the IGBT drive and protection module is provided with a gate UY4, an optocoupler GB1, a high-level drive optocoupler GENA1, a high-level drive optocoupler GENA3 and a relay HF7, the gate UY4 is connected to the optocoupler GB1, the optocoupler GB1 is connected to the high-level drive optocoupler GENA1 and the high-level drive optocoupler GENA3, and the high-level drive optocoupler GENA3 and the relay HF7 are turned on.

[0014] Preferably, the bypass switching control module is provided with a comparator U7, a transistor Q1, and a relay HF1, the comparator U7 is connected to the transistor Q1, and the transistor Q1 is connected to the relay HF1; the shutdown control module is provided with a relay HF9, a drive optocoupler GT2, a relay HF3, a relay HF5 and a gate UY3, the relay HF9 is connected to the drive optocoupler GT2, the drive optocoupler GT2 is connected to the relay HF3 and the gate UY3, and the gate UY3 is connected to the relay HF5.

[0015] Therefore, the utility model adopts the above-mentioned dual redundant DC motor control system, which not only has the advantages of high stability, but also has the advantages of high efficiency and high reliability.

[0016] The technical solution of the utility model is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is an overall system schematic diagram of a dual redundant DC motor control system of the utility model;

[0018] Figure 2 This is a schematic diagram of power conversion for a dual redundant DC motor control system of the utility model;

[0019] Figure 3 This is a schematic diagram of system voltage acquisition of a dual redundant DC motor control system of the utility model;

[0020] Figure 4 This is a schematic diagram of armature voltage collection of a dual redundant DC motor control system of the utility model;

[0021] Figure 5 This is a schematic diagram of excitation current collection for a dual redundant DC motor control system of the utility model;

[0022] Figure 6 This is a schematic diagram of the startup control of a dual redundant DC motor control system of the utility model;

[0023] Figure 7 This is a schematic diagram of soft start contactor control of a dual redundant DC motor control system of the utility model;

[0024] Figure 8 This is a schematic diagram of PWM signal conversion of a dual redundant DC motor control system of the utility model;

[0025] Fig. 9 This is a schematic diagram of IGBT drive and protection of a dual redundant DC motor control system of the utility model;

[0026] Fig.10 This is a bypass conversion schematic diagram of a dual redundant DC motor control system of the utility model;

[0027] Fig.11 This is a schematic diagram of shutdown control of a dual redundant DC motor control system of the utility model;

[0028] Fig.12 The utility model is a schematic diagram of demagnetization protection of a dual redundant DC motor control system. DETAILED DESCRIPTION

[0029] The technical solution of the utility model is further described below through the accompanying drawings and embodiments.

[0030] Unless otherwise defined, technical or scientific terms used in the present invention should have the common meanings understood by persons having ordinary skills in the field to which the present invention belongs.

[0031] Embodiment 1

[0032] like Figure 1-12 As shown, the utility model is a dual redundant DC motor control system, including a main system and an emergency starting system, wherein the emergency starting system includes a power conversion module, a system voltage acquisition module, an armature voltage acquisition module, an excitation current acquisition module, a starting control module, a soft start contactor control module, a PWM signal conversion module, an IGBT drive and protection module, a bypass switching control module, a shutdown control module and a demagnetization protection module; the self-test unit in the main system is connected to the power conversion module in the emergency starting system.

[0033] The power conversion module is provided with a fuse F1, a thermistor NTC1, a power module POWER1, a DC12V power supply, a power module POWER2 and a DC5V power supply. The fuse F1 is connected to the thermistor NTC1, the other side of the thermistor NTC1 is connected to the power module POWER1, the other side of POWER1 is connected to the DC12V power supply, and the DC12V power supply is converted into a DC5V power supply through the power module POWER2.

[0034] The DC220V power supply in the power conversion module is input to the power module POWER1 through the fuse F1 and thermistor NTC1. The power module POWER1 outputs a DC12V power supply, and the DC12V power supply is converted into a DC5V power supply through the power module POWER2.

[0035] The power conversion module is provided with a fuse F1, a thermistor NTC1, a power module POWER1, a DC12V power supply, a power module POWER2 and a DC5V power supply. The fuse F1 is connected to the thermistor NTC1, the other side of the thermistor NTC1 is connected to the power module POWER1, the other side of POWER1 is connected to DC12V, and the DC12V power supply is converted into a DC5V power supply through the power module POWER2.

[0036] The power module in the system voltage acquisition module is B1V1, and the isolated operational amplifier U3 provides an independent and isolated working power supply. The DC220V voltage is proportionally reduced to the voltage range (less than 200mv) that can be collected by the isolated operational amplifier U3 through the matching of the current limiting resistors R2-R6, R13-R17 and the sampling resistor R10 at the input end. The sampling voltage is isolated and amplified 8 times by the isolated operational amplifier U3, and then the output side is amplified 2 times by the operational amplifier U2. The voltage follower composed of the operational amplifier U1 is used to improve the output capacity. Finally, the voltage analog signal is converted into a 0-3.2V analog signal Adc_V_Sys at a ratio of 100:1 and connected to the comparator input of the startup control module U8.

[0037] The system voltage acquisition module includes a power module B1V1, an operational amplifier U1, current limiting resistors R2-R6, current limiting resistors R13-R17, resistor R7, capacitor C7, capacitor C8, diode D1, diode D2, operational amplifier U3 and operational amplifier U2. Current limiting resistors R2-R6 and current limiting resistors R13-R17 are connected to capacitor C7. Capacitor C7, capacitor C8 and resistor R7 are connected. Capacitor C8 is connected to diode D1 and diode D2. Diode D2 is connected to operational amplifier U3. Operational amplifier U3 is connected to operational amplifier U2. Operational amplifier U2 is connected to operational amplifier U1.

[0038] The armature voltage acquisition module is provided with a power supply module B1V5, an operational amplifier U6, current limiting resistors R21-R25, current limiting resistors R34-R38, resistor R26, resistor C16, capacitor C17, diode D5, diode D6, operational amplifier U5 and operational amplifier U4. The current limiting resistors R21-R25 and current limiting resistors R34-R38 are connected to capacitor C16. The capacitor C16, capacitor C17 and resistor R26 are connected. Capacitor C17 is connected to diode D5 and diode D6. Diode D6 is connected to operational amplifier U6. Operational amplifier U6 is connected to operational amplifier U5. Operational amplifier U5 is connected to operational amplifier U4.

[0039] The principle and configuration parameters in the armature voltage acquisition module are consistent with the system voltage sampling. The converted analog signal Adc_V_Ds is connected to the input end of the bypass switching control module U7 comparator.

[0040] The excitation current acquisition module is provided with a power supply module B1V3, an operational amplifier U11, a resistor R53, an operational amplifier U10, and an operational amplifier U9. The operational amplifier U11 is connected to a diode D8 and a diode D9, one side of the operational amplifier U11 is connected to the operational amplifier U10, and one side of the operational amplifier U10 is connected to the operational amplifier U9.

[0041] The power module B1V3 in the excitation current acquisition module provides an independent and isolated working power supply for the isolation amplifier U11. The current Hall sensor is used to convert the excitation current into a 4-20mA analog current signal. After filtering by the front-end π-type filter circuit, the current signal is proportionally converted into a 40-200mV voltage signal that can be collected by the isolation amplifier U11 through the sampling resistor R53. The diode D8 and the diode D9 limit the sampling voltage. After the sampling voltage is isolated and amplified 8 times by the isolation amplifier U11, the output side is amplified 2 times by the op amp U10. The voltage follower composed of the op amp U9 is used to improve the output capacity. Finally, the current analog signal is converted into a 0-3.2V analog signal Adc_I_Lc, which is connected to the comparator input of the soft start contactor control module U12 to control the soft start circuit relay HF5 to be attracted.

[0042] The starting control module is provided with relay HF10, relay HF2, relay HF12, drive optocoupler GT1, gate UY1 and comparator U8. The drive optocoupler GT1 is connected to gate UY1, comparator U8 is connected to gate UY1, and gate UY1 is connected to relay HF2 and relay HF12.

[0043] After the start signal IN_Start is input into the start control module, relay HF10 is energized, and both ends of the coil form a self-locking circuit through the series connection of the normally closed contact of the stop relay HF5, the normally closed contact of the stop relay HF9 and the normally open contact of HF10. One end of the coil is connected in series with the normally closed contact of the fault relay HF8 to ensure that the start command can be immediately locked after a system fault occurs. After the start signal is turned on, the optocoupler GT1 is driven to turn on, and the signal is isolated through the isolated power supply B1V to enhance the anti-interference performance of the system. When the start signal is at a high level, the optocoupler GT1 is turned on and outputs a high level to the input A terminal of the AND gate UY1. At the same time, the system voltage analog signal Adc_V_Sys is compared with the 2.0V reference voltage through the comparator U8. If the system voltage analog signal Adc_V_Sys is higher than the reference voltage, the comparator U8 outputs a high level. The two high-level signals are converted through the AND gate UY1 and output a high level, driving the transistor Q2 to make the relay HF2 actuate, and the HF2 contacts are closed. The first group of contacts 4 / 5 control the excitation contactor KM1 to be attracted, and the second group of contacts 2 / 3 control the demagnetization protection circuit to start working.

[0044] The soft start contactor control module is provided with an operational amplifier U12, a gate UY2, a transistor Q5, and a relay HF4. The operational amplifier U12 is connected to the gate UY2, the gate UY2 and the transistor Q5 are turned on, and the gate UY2 is connected to the relay HF4.

[0045] The operational amplifier U12 in the soft start contactor control module is used as a voltage comparator here to compare the excitation current analog signal with the configured threshold. When the excitation current is higher than the comparison value, U12 outputs a high level, and performs an AND operation with the START_signel signal of the start control part through the AND gate UY2. The high level output of UY2 drives the transistor Q5 to turn on, so that the relay HF4 is attracted, and the contacts 2 / 3 control the PWM enable circuit to start working. Adjusting the resistance value of RW1 can change the charging and discharging speed of the electrolytic capacitor C41, thereby changing the PWM duty cycle from 0 to 100%, thereby changing the starting time of the DC motor.

[0046] In the PWM signal conversion, the APC chip U16 linearly converts the 0-5V analog signal Adc_pwm at the input end into a PWM signal with a duty cycle of 0-100%. After the signal is isolated by capacitor C57, it is input to the PWM signal demodulation chip U17. U17 then restores the signal to a PWM signal output. While ensuring that the signal transmission is not distorted, the capacitor isolation improves the electrical isolation performance. Finally, U17 outputs the PWM_Si gnal signal to the IGBT drive and protection module; U17 is independently powered by an isolated power supply, which further improves the electrical isolation performance and can improve the system's anti-interference performance when the power device is working.

[0047] The IGBT drive and protection module is provided with a gate UY4, an optocoupler GB1, a high-level drive optocoupler GEN A1, a high-level drive optocoupler GENA3 and a relay HF7. The gate UY4 is connected to the optocoupler GB1. The optocoupler GB1 is connected to the high-level drive optocoupler GENA1 and the high-level drive optocoupler GENA3. The high-level drive optocoupler GENA3 and the relay HF7 are turned on.

[0048] The isolated power supply A1 in the IGBT drive and protection module converts the DC5V power supply into two voltage levels of +15V and -7V, providing a reliable and stable drive power supply for the IGBT; the PWM_Signal drive signal and the IGBT fault signal are output to the optocoupler GB1 drive end through the AND gate UY4. When the IGBT is abnormal, the drive signal can be blocked immediately to achieve hardware protection of the IGBT. The PWM signal controls the on and off of the optocoupler GB1, and outputs the +15V and -7V drive voltages of the same frequency and synchronization with the PWM_Signal drive signal to the IGBT drive ends P1-2 and P1-3 to achieve the drive control of the IGBT; the IGBT overcurrent detection circuit determines whether the IGBT is overcurrent by detecting the voltages at both ends of IGBT C and E. When overcurrent occurs, the IGBT C pole voltage rises rapidly, and the U15 comparator outputs a high level to drive the optocouplers GENA1 and GENA3 to turn on at the same time. After GENA1 is turned on, it immediately sends an IGBT fault signal to UY 4 AND gate input terminal, blocking the driving signal; after GENA3 is turned on, the relay HF7 is activated, and the contacts 4 / 5 are closed to send out a fault alarm signal; contacts 2 / 3 are closed, so that the relay HF8 is energized, and the normally closed contact of HF8 is disconnected, thereby disconnecting the excitation contactor KM1, the soft start contactor KM2, the bypass contactor KM3 and the locking circuit of the start command to realize the fault protection function; in the bypass conversion, the armature voltage analog quantity Adc_V_Ds and the configured threshold are ANDed through the comparator U7. When the armature voltage analog quantity is higher than the configured threshold, the comparator U7 outputs a high level, drives the transistor Q1 to turn on, and then controls the relay HF1 to close, so that the bypass contactor is energized.

[0049] The bypass switching control module is provided with a comparator U7, a transistor Q1, and a relay HF1, wherein the comparator U7 is connected to the transistor Q1, and the transistor Q1 is connected to the relay HF1;

[0050] After the stop signal IN_Stop is turned on, the relay HF9 is energized, and the normally open contacts 6 / 8 of HF9 are connected in series with the normally open contacts 4 / 5 of HF12. Then, the 24V power supply is connected to the HF9 coil to form a self-locking state. The stop signal drives the optocoupler GT2 to conduct and output a high-level signal, so that the relay HF3 is energized, and the normally closed contacts 4 / 6 and 3 / 5 of HF3 disconnect the self-locking circuit of the bypass relay HF1, so that HF1 loses power and the bypass contactor is disconnected. At the same time, State_Qj becomes a low level, so that the transistor Q5 of the soft start control part is turned on, and the electrolytic capacitor C41 begins to discharge, thereby reducing the PWM duty cycle and reducing the armature voltage analog The simulated value Adc_V_Ds is compared with the configured threshold. When it is lower than the configured threshold, the U13 comparator outputs a high level, performs an AND operation with the shutdown signal, and the AND gate UY3 outputs a high level, driving the transistor Q6 to turn on, the relay HF5 is energized, and the contacts 4 / 6 disconnect the self-locking circuit of the starter relay HF10, causing the start signal to disappear, UY1 outputs a low level, and the relay HF2 is disconnected, disconnecting the excitation contactor KM1; the contacts 3 / 5 disconnect the control circuit of the soft start contactor KM2, disconnecting the soft start contactor and completing the shutdown.

[0051] The shutdown control module is provided with a relay HF9, a drive optocoupler GT2, a relay HF3, a relay HF5 and a gate UY3, wherein the relay HF9 is connected to the drive optocoupler GT2, the drive optocoupler GT2 is connected to the relay HF3 and the gate UY3, and the gate UY3 is connected to the relay HF5.

[0052] After the excitation contactor is energized in the demagnetization protection, the excitation current detection function is triggered, and the excitation current analog quantity Adc_I_Lc of the soft start control part is ANDed with the configured threshold through the AND gate U12. If the excitation current is higher than the configured threshold, the U12 comparator output State_LC is high; if the excitation current is lower than the configured threshold, the U12 comparator output State_LC is low, so that the demagnetization protection part optocoupler GEN A2 is turned on. After the voltage of the electrolytic capacitor C50 rises to the configured threshold, the AND gate U14 outputs a high level, the HF6 relay is actuated, and the excitation fault alarm is triggered. The Err_net high level causes the relay HF8 to energize, and the normally closed contacts 4 / 6 are disconnected, so that the start signal self-locking circuit is cut off, and the control circuits of the excitation contactor KM1 and the soft start contactor KM2 are cut off; the normally closed contacts 3 / 5 are disconnected, so that the bypass contactor KM3 control circuit is disconnected, and the demagnetization protection of the DC motor is realized to prevent the occurrence of "flying car" accidents.

[0053] Therefore, the utility model adopts the above-mentioned dual redundant DC motor control system, which not only has the advantages of high stability, but also has the advantages of high efficiency and high reliability.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that they can still modify or replace the technical solution of the utility model with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the utility model.

Claims

1. A dual redundant DC motor control system, characterized in that: It includes a main system and an emergency starting system, wherein the emergency starting system includes a power conversion module, a system voltage acquisition module, an armature voltage acquisition module, an excitation current acquisition module, a starting control module, a soft start contactor control module, a PWM signal conversion module, an IGBT drive and protection module, a bypass switching control module, a shutdown control module and a demagnetization protection module; the self-test unit in the main system is connected to the power conversion module in the emergency starting system.

2. A dual redundant DC motor control system according to claim 1, characterized in that: The power conversion module is provided with a fuse F1, a thermistor NTC1, a power module POWE R1, a DC12V power supply, a power module POWER2 and a DC5V power supply. The fuse F1 is connected to the thermistor NTC1, the other side of the thermistor NTC1 is connected to the power module POWER1, the other side of the power module POWER1 is connected to the DC12V power supply, and the DC12V power supply is converted into a DC5V power supply through the power module POWER2.

3. A dual redundant DC motor control system according to claim 1, characterized in that: The system voltage acquisition module includes a power module B1V1, an operational amplifier U1, current limiting resistors R2-R6, current limiting resistors R13-R17, resistor R7, capacitor C7, capacitor C8, diode D1, diode D2, operational amplifier U3 and operational amplifier U2. The current limiting resistors R2-R6 and current limiting resistors R13-R17 are connected to capacitor C7. The capacitor C7, capacitor C8 and resistor R7 are connected. The capacitor C8 is connected to diode D1 and diode D2. The diode D2 is connected to operational amplifier U3. The operational amplifier U3 is connected to operational amplifier U2. The operational amplifier U2 is connected to operational amplifier U1.

4. A dual redundant DC motor control system according to claim 1, characterized in that: The armature voltage acquisition module is provided with a power supply module B1V5, an operational amplifier U6, current limiting resistors R21-R25, current limiting resistors R34-R38, resistor R26, resistor C16, capacitor C17, diode D5, diode D6, operational amplifier U5 and operational amplifier U4. The current limiting resistors R21-R25 and current limiting resistors R34-R38 are connected to capacitor C16. The capacitor C16 and capacitor C17 are connected to resistor R26. The capacitor C17 is connected to diode D5 and diode D6. The diode D6 is connected to operational amplifier U6. The operational amplifier U6 is connected to operational amplifier U5. The operational amplifier U5 is connected to operational amplifier U4.

5. A dual redundant DC motor control system according to claim 1, characterized in that: The excitation current acquisition module is provided with a power supply module B1V3, an operational amplifier U11, a resistor R53, an operational amplifier U10, and an operational amplifier U9. The operational amplifier U11 is connected to a diode D8 and a diode D9, one side of the operational amplifier U11 is connected to the operational amplifier U10, and one side of the operational amplifier U10 is connected to the operational amplifier U9.

6. A dual redundant DC motor control system according to claim 1, characterized in that: The startup control module is provided with relay HF10, relay HF2, relay HF12, drive optical coupler GT1, gate UY1, and comparator U8. The drive optical coupler GT1 is connected to gate UY1, the comparator U8 is connected to gate UY1, and the gate UY1 is connected to relay HF2 and relay HF12.

7. A dual redundant DC motor control system according to claim 1, characterized in that: The soft start contactor control module is provided with an operational amplifier U12, a gate UY2, a transistor Q5, and a relay HF4. The operational amplifier U12 is connected to the gate UY2, the gate UY2 and the transistor Q5 are turned on, and the gate UY2 is connected to the relay HF4.

8. A dual redundant DC motor control system according to claim 1, characterized in that: The PWM signal conversion module is provided with an APC chip U16, a signal conditioning chip U17, and a capacitor C57. The APC chip U16 is connected to the signal conditioning chip U17 via the capacitor C57.

9. A dual redundant DC motor control system according to claim 1, characterized in that: The IGBT driving and protection module is provided with a gate UY4, an optocoupler GB1, a high-level driving optocoupler GENA1, a high-level driving optocoupler GENA3 and a relay HF7. The gate UY4 is connected to the optocoupler GB1, the optocoupler GB1 is connected to the high-level driving optocoupler GENA1 and the high-level driving optocoupler GENA3, and the high-level driving optocoupler GENA3 and the relay HF7 are turned on.

10. A dual redundant DC motor control system according to claim 1, characterized in that: The bypass switching control module is provided with a comparator U7, a transistor Q1, and a relay HF1. ​​The comparator U7 is connected to the transistor Q1, and the transistor Q1 is connected to the relay HF1; the shutdown control module is provided with a relay HF9, a drive optocoupler GT2, a relay HF3, a relay HF5 and a gate UY3. The relay HF9 is connected to the drive optocoupler GT2, the drive optocoupler GT2 is connected to the relay HF3 and the gate UY3, and the gate UY3 is connected to the relay HF5.

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