A servo press drive control circuit

Abstract

The utility model relates to a kind of servo punch driver control circuit, by adopting main, collaboration double microcontroller division of labour architecture, core servo algorithm, power drive and protection task are assigned to main microcontroller, and human-computer interaction, encoder communication etc. Peripheral management task is assigned to collaborative microcontroller, both work cooperatively through isolation communication module, realizes task decoupling and parallel processing, to significantly improve the overall operation efficiency and control response speed of system, meet the high dynamic performance requirement of servo punch, by setting independent communication power isolation module for touch screen communication module, encoder communication module and isolation communication module to power supply, and using digital isolator etc. Interference introduced by common-mode noise, potential difference is effectively suppressed.

Description

Technical Field

[0001] This utility model relates to the field of servo punch press driver technology, and in particular to a servo punch press driver control circuit. Background Technology

[0002] Currently, most servo press drivers adopt a single microcontroller architecture. This architecture needs to handle multiple tasks simultaneously, including servo core algorithms, peripheral communication, and signal acquisition. In high-speed, high-precision stamping operations, it is prone to problems such as insufficient real-time control and response lag, making it difficult to meet the requirements of high dynamic performance. At the same time, industrial sites have strong electromagnetic interference and complex grounding environments, which can easily couple to the control system through communication interfaces, power supplies, and signal lines, leading to communication errors, sampling distortion, and even device damage. The reliability and stability of the system face severe challenges. In addition, the power protection circuits of existing drivers are often relatively simple, and their protection against complex operating conditions such as bus voltage fluctuations, regenerative energy discharge, and instantaneous overcurrent is not comprehensive enough. The detection accuracy and anti-interference capability of external safety signals and sensor analog quantities also need to be improved, which restricts the safety and long-term stable operation of the equipment. Summary of the Invention

[0003] In view of this, the purpose of this utility model is to provide a servo punch press driver control circuit with high performance dual-core processing, strong anti-interference capability and high dynamic response performance.

[0004] To achieve the above objectives, this utility model employs a servo punch press driver control circuit, including a main microcontroller, a cooperating microcontroller, an IPM module, a rectifier and filter module, a power supply module, a brake resistor control module, a phase current detection module, a signal conditioning module, a temperature sensor detection module, a fan drive module, an isolation communication module, an encoder communication module, a communication power isolation module, and a touch screen communication module. The IPM module drives the servo motor, the touch screen communication module connects to an external touch screen, the encoder communication module connects to an external motor encoder, the brake resistor control module connects to an external brake resistor, the output of the rectifier and filter module forms a high-voltage DC bus, the fan drive module connects to an external cooling fan, and the temperature sensor detection module connects to an external temperature sensor. The input of the power supply module and the IPM module... The power input terminals of the block and the brake resistor control module are both connected to the high-voltage DC bus. The output terminals of the phase current detection module and the temperature sensor detection module are both connected to the input terminal of the main microcontroller. The output terminal of the main microcontroller is connected to the input terminals of the IPM module, the brake resistor control module, and the fan drive module, respectively. The output terminal of the signal conditioning module is connected to the input terminal of the cooperating microcontroller. The cooperating microcontroller communicates with the external touch screen and the external motor encoder through the touch screen communication module and the encoder communication module, respectively. The feedback information from the external motor encoder is processed by the cooperating microcontroller and then transmitted to the main microcontroller through the isolation communication module. The communication power isolation module provides isolated operating power for the isolation communication module, the encoder communication module, and the touch screen communication module.

[0005] This utility model is further configured such that the IPM module includes a level converter and a smart power chip. The input terminal of the level converter is connected to the main microcontroller, and the output terminal of the level converter is connected to the control terminal of the smart power chip. The power output terminal of the smart power chip is used to drive a servo motor.

[0006] This utility model is further configured such that the brake resistor control module includes a PWM controller and a power switch transistor. The main microcontroller is connected to and controls the PWM controller, and the PWM controller is connected to and controls the power switch transistor. The power switch transistor is connected in series between the external brake resistor and the high-voltage DC bus.

[0007] This utility model is further configured such that the phase current detection module includes a voltage detection circuit and a current detection circuit. The voltage detection circuit is used to sample the voltage of the high-voltage DC bus and output it to the main microcontroller. The current detection circuit is used to sample the phase current of the servo motor output by the IPM module and output it to the main microcontroller.

[0008] This utility model is further configured such that the signal conditioning module includes a reference voltage generation circuit and at least one differential sampling circuit. The differential sampling circuit includes a differential amplifier and a filter circuit, which is used to amplify and filter the externally input security differential signal and convert it into a single-ended voltage signal for output to the cooperative microcontroller.

[0009] This utility model is further configured as a rectifier and filter module comprising an input filter, a rectifier bridge, a surge suppression circuit, and a controlled relay connected in sequence, wherein the control coil of the controlled relay is driven by the main microcontroller.

[0010] This utility model is further configured such that the power module includes an isolated flyback converter and a subsequent multi-channel voltage regulator circuit. The isolated flyback converter converts the high-voltage DC input into multiple isolated DC outputs. The subsequent multi-channel voltage regulator circuit includes at least one switching buck circuit and a linear voltage regulator circuit to generate the required multiple low-voltage power supplies.

[0011] This utility model is further configured such that the fan drive module includes an optocoupler isolation circuit and a power switch circuit, and the main microcontroller controls the on / off state of the power switch circuit through the optocoupler isolation circuit to drive the external cooling fan.

[0012] This utility model is further configured such that the temperature sensor detection module includes a voltage divider sampling circuit and a signal protection circuit. The voltage divider sampling circuit and the external temperature sensor form a voltage divider network, and the signal protection circuit is used to limit the signal voltage input to the main microcontroller.

[0013] This utility model is further configured with the main microcontroller being model AT32F413RCT7 and the cooperating microcontroller being model AT32F415CBT7.

[0014] The beneficial effects of this invention are as follows: By adopting a dual-microcontroller architecture with a main and cooperative microcontroller, the core servo algorithm, power drive, and protection tasks are assigned to the main microcontroller, while peripheral management tasks such as human-machine interaction and encoder communication are assigned to the cooperative microcontroller. The two microcontrollers work together through an isolated communication module, achieving task decoupling and parallel processing, thereby significantly improving the overall system's computational efficiency and control response speed, meeting the high dynamic performance requirements of servo punch presses. Furthermore, by providing independent communication power isolation modules for the touchscreen communication module, encoder communication module, and isolated communication module, and employing isolation designs such as digital isolators, common interference is effectively suppressed. Interference introduced by mode noise and potential difference, combined with the intelligent drive of the IPM module, the real-time monitoring of the phase current detection module, and the rapid energy discharge of the braking resistor control module, along with the soft start achieved by the controlled relay in the rectifier and filter module, jointly ensure the safe and reliable operation of the power link, reduce the failure rate, and extend the service life of the equipment. The signal conditioning module adopts differential amplification and precision reference voltage design, which can extract and determine the status of the external safety circuit with high accuracy and improve the sensitivity to fault detection. The temperature sensor detection module integrates voltage divider sampling and input protection circuit, which can effectively prevent overvoltage signals from impacting the main control chip while achieving accurate temperature monitoring. Attached Figure Description

[0015] Figure 1 This is a circuit principle block diagram of an embodiment of the present invention.

[0016] Figure 2 This is a circuit diagram of the brake resistor control module according to an embodiment of the present invention.

[0017] Figure 3 This is a circuit diagram of the phase current detection module according to an embodiment of the present invention.

[0018] Figure 4 This is a circuit diagram of the signal conditioning module according to an embodiment of the present invention.

[0019] Figure 5 This is a circuit diagram of the temperature sensor detection module according to an embodiment of the present invention.

[0020] Figure 6 This is a circuit diagram of the fan drive module according to an embodiment of the present invention.

[0021] Figure 7 This is a circuit diagram of the communication power isolation module according to an embodiment of the present invention.

[0022] Figure 8 This is a circuit diagram of the encoder communication module according to an embodiment of the present invention.

[0023] Figure 9 This is a circuit diagram of the isolated communication module according to an embodiment of the present invention.

[0024] Figure 10 This is a circuit diagram of the rectifier and filter module according to an embodiment of the present invention.

[0025] Figure 11 This is a circuit diagram of an isolated flyback converter according to an embodiment of the present invention.

[0026] Figure 12 This is a diagram of the post-stage multi-channel voltage regulator circuit of an embodiment of this utility model.

[0027] Figure 13 This is a circuit diagram of the IPM module according to an embodiment of the present invention.

[0028] Figure 14 This is a circuit diagram of the collaborative microcontroller according to an embodiment of the present invention.

[0029] Figure 15 This is a circuit diagram of the touch screen communication module according to an embodiment of the present invention.

[0030] Figure 16 This is a circuit diagram of the main microcontroller in an embodiment of this utility model. Detailed Implementation

[0031] like Figures 1-16 As shown, an embodiment of this utility model provides a servo punch press driver control circuit, including a main microcontroller, a cooperating microcontroller, an IPM module, a rectifier and filter module, a power supply module, a brake resistor control module, a phase current detection module, a signal conditioning module, a temperature sensor detection module, a fan drive module, an isolation communication module, an encoder communication module, a communication power isolation module, and a touch screen communication module.

[0032] The IPM module drives the servo motor, the touchscreen communication module connects to an external touchscreen, the encoder communication module connects to an external motor encoder, the brake resistor control module connects to an external brake resistor, the output of the rectifier and filter module forms a high-voltage DC bus, the fan drive module connects to an external cooling fan, and the temperature sensor detection module connects to an external temperature sensor. The inputs of the power supply module, the IPM module, and the brake resistor control module are all connected to the high-voltage DC bus. The outputs of the phase current detection module and the temperature sensor detection module are connected to the input of the main microcontroller. The output of the main microcontroller is connected to the inputs of the IPM module, the brake resistor control module, and the fan drive module, respectively. The output of the signal conditioning module is connected to the input of the cooperating microcontroller. The cooperating microcontroller communicates with the external touchscreen and the external motor encoder through the touchscreen communication module and the encoder communication module, respectively. The feedback information from the external motor encoder is processed by the cooperating microcontroller and then transmitted to the main microcontroller through the isolation communication module. The input of the communication power isolation module is connected to the power supply module, and the communication power isolation module provides isolated operating power for the isolation communication module, the encoder communication module, and the touchscreen communication module.

[0033] like Figure 2 and Figure 16As shown, the brake resistor control module is connected to the base of transistor TR3 via current-limiting resistors R38 and R39 through pin 17 (PWM7) of the main microcontroller. The base of transistor TR3 is also connected to VCC 3.3V via pull-up resistor R36, and in parallel with decoupling capacitor C46. Pull-up resistor R36 ensures that transistor TR3 is reliably cut off when the microcontroller pin is in a high-impedance state. When pin 17 (PWM7) of the microcontroller outputs a low level, transistor TR3 is cut off, and the second pin of PWM controller U5 is internally pulled high, enabling the chip. When pin 17 (PWM7) of the main microcontroller outputs a high level, transistor TR3 is saturated and turned on, forcibly pulling the second pin of PWM controller U5 low, disabling the chip. Pin 8 of PWM controller U5 is powered by VCC 16.5V and decoupled and filtered by capacitor C49. The third pin of controller U5 is the shutdown pin. This pin is connected to the power ground PGND through resistor R40 and capacitor C50. Resistor R40 limits the input current, and capacitor C50 filters out noise spikes, together preventing false triggering and ensuring accurate and reliable shutdown response. After PWM controller U5 is enabled, PWM signals are output from its sixth and seventh pins. The signal drives the gate of power switch IG1 through drive resistor R42. Between the gate and source of power switch IG1, there is a pull-down resistor R44, an accelerating capacitor C51, and a bidirectional TVS diode to ensure reliable switching and protect the gate. The drain of power switch IG1 is connected to an external braking resistor through the fifth pin PB of terminal J6. The other end of the braking resistor is connected to the high-voltage bus VBC1+. The freewheeling diode D5 is connected in reverse parallel between the drain and source of power switch IG1 to suppress shutdown voltage spikes.

[0034] like Figure 3 and Figure 16 As shown, the phase current detection module includes a voltage detection circuit and a current detection circuit. The voltage detection circuit reduces the voltage of the high-voltage DC bus VBC1+ through a high-voltage divider composed of resistors R25, R26, and R32. The signal after voltage division is filtered by capacitor C48 and resistor R37, and then impedance-isolated and driven by voltage follower U2D. The buffered signal is sent to pin 11 AD_VDC1 of the main microcontroller to monitor whether the bus voltage is over-voltage or under-voltage.

[0035] The current detection circuit includes a U-phase current detection circuit and a W-phase current detection circuit. Taking the U-phase current detection circuit as an example, the current detection chip U1 is connected in series between the 24th pin (IU terminal) of the IPM module and the 6th pin (U terminal) of the line terminal J6. The differential signal output from the 6th and 7th pins of the current detection chip U1 is fed into a differential amplifier composed of operational amplifier U2A and external resistors R5, R6, and R3. This differential amplifier converts the differential signal into a single-ended voltage signal referenced to ground and amplifies it proportionally to adapt to the 14th pin (AD_IU1 terminal) of the main microcontroller. Capacitors C9, C10, and C1 are used for filtering. The W-phase current detection circuit has the same structure as the U-phase current detection circuit, consisting of the current detection chip U4, operational amplifier U2B, and external circuitry. The output signal AD_IW1 is sent to the main microcontroller. Since operational amplifiers U2A and U2B are powered by a single power supply VCC 3.3VA, a DC bias voltage needs to be provided to detect bidirectional AC current. This DC bias voltage is generated by voltage follower U2C. The non-inverting input of voltage follower U2C is divided from VCC 3.3VA through resistors R4 and R7 to obtain a 1.65V reference. The output of voltage follower U2C is provided to the non-inverting inputs of operational amplifiers U2A and U2B through resistors R8 and R17, respectively, as the DC bias point of the signal. Current detection chips U1 and U4 are powered by a +5VB power supply and are equipped with decoupling capacitors C7, C8, C30, and C31.

[0036] like Figure 4 and Figure 14As shown, the signal conditioning module includes a reference voltage generation circuit and at least one differential sampling circuit. The reference voltage generation circuit consists of a voltage follower U16A and its peripheral resistors R95 and R100. Resistors R95 and R100 divide the analog power supply VDDA to generate a stable intermediate potential reference. This reference voltage, after being buffered by the voltage follower U16A, provides a low-impedance common-mode reference voltage for the subsequent differential sampling circuit. The differential sampling circuit has two channels with identical structures. Taking the first channel as an example, the differential amplifier of this channel is composed of... Operational amplifier U16C and external resistors R102, R104, R97, and R94 form a precise differential amplification ratio. External safety signals are input to this differential amplifier through the F+ and VREF- pins of terminal J2. The common-mode reference voltage output from the reference voltage generation circuit is introduced into the amplification circuit through resistors R104 and R97, ensuring that the amplified single-ended signal is centered at VDDA / 2. The filtering circuit is multi-stage. At the input of the differential amplifier, capacitors C106, C112, and C107, along with relevant resistors, form the input... A low-pass filter is used to suppress high-frequency noise in the input signal. At the amplifier output, resistor R99 and capacitor C110 form a post-stage RC low-pass filter to perform final filtering on the conditioned signal. The analog voltage signal after amplification and filtering is output from operational amplifier U16C and sent directly to pin 10 PAA0 of the cooperating microcontroller. The cooperating microcontroller firmware periodically samples this voltage value and compares it with the preset safety threshold in the program to determine the status of the external safety loop. The second differential sampling channel has the same structure, consisting of operational amplifier U16D, etc., which processes the signal from terminal J3 and outputs it to pin 11 PAA1 of the cooperating microcontroller. In addition, to ensure high sampling accuracy, operational amplifiers U16A, U16C, and U16D in the signal conditioning module are all powered by independent, clean analog power supply VDDA and analog ground GNDA. Analog ground GNDA is connected to the system's digital ground and power ground at a single point on the motherboard, and the module is strictly isolated to minimize the interference of digital noise and power noise on the weak analog signal.

[0037] like Figure 5 and Figure 16As shown, the temperature sensor detection module includes a voltage divider sampling circuit and a signal protection circuit. The voltage divider sampling circuit and the external temperature sensor form a voltage divider network. The signal protection circuit limits the signal voltage input to the main microcontroller. The temperature sensor detection module connects to the external temperature sensor via a TEMP connector. The second pin of the TEMP connector provides a stable +5V excitation power supply to the temperature sensor, and its first pin is connected to the signal output terminal of the temperature sensor to receive the resistance change signal. The voltage divider sampling circuit consists of resistors R34 and R35 and the external temperature sensor. Resistors R34 and R35 are connected in series between VCC5V and ground, and the voltage at their voltage divider node serves as a reference. The temperature sensor is connected in parallel with resistor R34 to linearly convert the change in the sensor's resistance value. The change in voltage signal is converted into a primary filter circuit, with capacitor C47 connected in parallel at the voltage divider node. This primary filter performs initial high-frequency noise filtering on the converted voltage signal. The temperature signal voltage obtained by voltage division sampling is directly transmitted to the tenth pin AD_TEMP of the main microcontroller after passing through the current-limiting resistor R10. To protect the AD_TEMP pin of the main microcontroller from excessive voltage surges, this embodiment sets up a voltage clamping protection circuit at the end of the signal transmission path. This circuit consists of two series-connected switching diodes D3, with their common terminal connected to the AD_TEMP pin. This strictly clamps the voltage input to this pin within a safe range, thereby effectively preventing overvoltage damage. Capacitor C21 serves as the local oscillator decoupling capacitor for this ADC pin, further filtering out high-frequency interference and ensuring sampling accuracy.

[0038] like Figure 6 and Figure 16As shown, the fan drive module includes an optocoupler isolation circuit and a power switch circuit. The main microcontroller controls the power switch unit circuit through the optocoupler isolation circuit to drive the external cooling fan. The optocoupler isolation unit consists of optocoupler U31 and its peripheral circuit. The fan control pin FAN of the main microcontroller is connected to the negative terminal of the LED of optocoupler U31 through a current-limiting resistor R183. Its positive terminal is connected to the +5V control power supply VCC5V through another current-limiting resistor R182. Capacitor C175 provides decoupling for this control power supply. When the main microcontroller outputs a high-level drive signal, optocoupler U31 is turned on, realizing electrical isolation between the control signal and the power side. The power switch circuit uses transistor Q6 as the low-side switch to form a low-side drive circuit. The collector of the light-receiving end of optocoupler U31 is connected to the +24V power supply through pull-up resistors R179 and R180, and its emitter is connected to the base of transistor Q6. When optocoupler U31 is turned on, the base of transistor Q6 is pulled high and saturated. Resistor R181 is connected between the base of transistor Q6 and ground to ensure reliable shutdown when the optocoupler is off. The external cooling fan is connected via a straight-pin connector FAN. Its power supply circuit is as follows: the +24V main power supply passes through the resettable fuse J12 and the noise suppression inductor L4 in sequence, and then connects to the first pin of the straight-pin connector FAN. The second pin of the straight-pin connector FAN is connected to the collector of transistor Q6. When transistor Q6 is on, a complete fan current path is formed. The dual series-connected switching diode D23 is used as a freewheeling diode. Its common terminal is connected to the second pin of the straight-pin connector FAN to absorb the reverse electromotive force spike generated by the inductor coil when the fan is off, protecting transistor Q6. Capacitor C173 is connected in parallel across the power supply pin of the straight-pin connector FAN to provide local decoupling for the fan and stabilize the operating voltage. The resettable fuse J12 is connected in series in the power supply circuit to provide recoverable overcurrent protection. Inductor L4 is used to suppress the high-frequency noise generated by the fan motor from flowing back into the system power supply.

[0039] like Figure 7As shown, the communication power isolation module is located between the system power supply and the communication interface, playing a crucial role in electrical and noise isolation. Its core uses an isolated DC-DC converter U23, which converts the main circuit +5V power supply to an electrically isolated +5V_A auxiliary power supply. The input of the DC-DC converter U23 effectively suppresses high-frequency noise from the main power supply through resistor FL16 and capacitor C152. The DC-DC converter U23 achieves electrical isolation and voltage conversion through an internal transformer. The output of the DC-DC converter U23 filters switching noise through capacitors C153 and C154, providing a stable and clean isolated power supply. Capacitor C157 is used to suppress backflow interference from module switching noise to the input power supply. Resistor R134 is in the NC position for design, debugging, and compatibility. This communication power isolation module supplies power to the subsequent encoder communication module and isolated communication module, ensuring that their signal ground is independent of the noisy main power ground. This significantly enhances the anti-interference capability and long-term operational stability of the entire communication system in industrial environments from the power source.

[0040] like Figure 8 As shown, the encoder communication module is based on the RS-485 transceiver U20, which is responsible for bidirectional differential signal transmission between the cooperating microcontroller and the encoder. Its purpose is to provide strong anti-common-mode interference capability to meet the stringent requirements for communication reliability in industrial environments.

[0041] like Figure 9 As shown, the isolation communication module is based on the isolation communication interface of the digital isolator U9 and is used for signal transmission between the main microcontroller and the cooperating microcontroller to achieve electrical isolation and noise suppression.

[0042] like Figure 10 and Figure 16As shown, the rectifier and filter module includes an input filter, a rectifier bridge, a surge suppression circuit, and a controlled relay connected in sequence. The control coil of the controlled relay is driven by the main microcontroller. The input filter consists of a common-mode inductor and capacitors C11 and C12. The AC input live wire L and neutral wire N are connected through terminal J6 and filtered by the common-mode inductor. Capacitors C11 and C12 are connected between the filtered live wire, neutral wire, and protective ground PE, respectively, forming a line-to-ground filter to jointly suppress common-mode and differential-mode electromagnetic interference. The rectifier bridge is a DB rectifier bridge. 1. Its two AC input terminals are respectively connected to the live wire and neutral wire after being processed by the input filter, rectifying the AC power into pulsating DC power. The surge suppression circuit is composed of a negative temperature coefficient thermistor RT1, which is connected in series between the positive DC output of the rectifier bridge DB1 and the subsequent circuit. It is used to suppress the surge current generated when the system is powered on due to the charging of the large-capacity capacitor in the subsequent stage. The controlled relay is a single-pole double-throw relay K1. Its common contact is connected to the DC high voltage processed by the surge suppression circuit thermistor RT1, and its normally open contact outputs to... The high-voltage DC bus VBC1+ supplies power to the downstream power module. The main microcontroller drives the controlled relays through an isolated drive circuit. Specifically, pin 26 (PLY) of the main microcontroller drives the light-emitting terminal of optocoupler U30 through transistor TR5. After the light-receiving terminal of optocoupler U30 is turned on, it controls the base of transistor Q1, causing transistor Q1 to saturate and conduct. One end of the coil of relay K1 is connected to a 24V auxiliary power supply, and the other end is connected to the collector of transistor Q1. Therefore, when the main microcontroller outputs a high-level enable signal, transistor Q1... When the circuit is turned on, the coil of relay K1 is energized, and its normally open contact closes, sending high-voltage DC to the subsequent stage. The freewheeling diode D1 connected in parallel across the coil of relay K1 is used to absorb the induced electromotive force when the circuit is turned off. The negative terminal of the DC output of rectifier bridge DB1 is directly connected to the primary power ground PGND. In this embodiment, the final output is a controlled high-voltage DC VBC1+ and PGND, which provides power to the subsequent isolated flyback converter circuit. Among them, the varistor RV1 is connected in parallel between the AC input live wire L1 and the neutral wire L2 to absorb overvoltage spikes on the grid side.

[0043] like Figure 11 and Figure 12 As shown, the power module mainly consists of two parts: an isolated flyback converter circuit and a subsequent multi-channel voltage regulator circuit. The flyback converter converts the input 310V DC high voltage into isolated and safe low-voltage DC power. The subsequent multi-channel voltage regulator circuit is used to perform secondary adjustment, filtering and distribution of the flyback output voltage to generate the required high-precision, low-noise voltage levels.

[0044] The input VBC1+ serves as the power supply starting point. After being filtered by electrolytic capacitors C5 and C6 and ceramic capacitor C67 in parallel, its negative terminals are connected to the primary power ground PGND to filter out input noise and suppress primary switching interference. High voltage is supplied to pin 7 of the control chip U12 through high-resistance starting resistors R49, R53, R54, and R57, charging the energy storage capacitor C76 and ceramic capacitor C77 on the VCCF1 network to establish the initial operating voltage. Once the chip starts working, the AC voltage generated by the auxiliary winding of transformer T1, after rectification, is fed into the VCCF1 network through current-limiting resistors R58 and R59 and TVS diode D16, replacing the starting resistor and providing a continuous and stable operating current for the chip. TVS diode D16... The VCCF1 voltage is clamped to a safe value. The fourth pin of the control chip is connected to the eighth pin of the control chip and ground via timing resistor R66 and timing capacitor C95 to set the PWM oscillation frequency. Capacitor C97 is the filter capacitor for the eighth pin of control chip U12. The third pin of control chip U12 is connected to the source of power MOSFET U11 via resistor R67. The voltage drop across resistor R67 is used for peak current control and overcurrent protection. Capacitor C96 is used to filter out the leading edge spike of the detection signal. The second pin of control chip U12 receives feedback current through current-limiting resistor R62. Resistor R68 is the pull-down bias resistor for the second pin of control chip U12. The first pin of control chip U12 is connected via compensation capacitor C85 and... Resistor R65 and capacitor C83 are connected to ground. Pin 6 of control chip U12 drives the gate of power MOSFET U11 through drive resistors R60 and R61. The drain of power MOSFET U11 is connected to pin 5 of the primary winding of transformer T1. Its source is connected to PGND through sampling resistor R67, forming the main power current path. Resistor R122 is connected in series with the gate of power MOSFET U11 to dampen oscillation. Bidirectional TVS diode D17 is connected in parallel between the gate and source to absorb gate-induced voltage spikes and prevent gate-source breakdown. The source of power MOSFET U11 is connected to PGND through multiple parallel resistors R69, R70, and R71. Pin 6 of the primary winding of transformer T1 is connected to the input high voltage VBC1. The fifth pin of the primary winding of transformer T1 is connected to the drain of power MOSFET U11. The fourth pin of the secondary winding of transformer T1 is connected to a rectified DC voltage of 4V obtained by rectifier diode D14, capacitor C68, and electrolytic capacitor C65. Resistor R52 serves as a minimum load to ensure stable output voltage under no-load conditions. The first pin of the secondary winding of transformer T1 is connected to the secondary isolation ground XGND. The third pin of the secondary winding of transformer T1 is rectified by rectifier diode D11 and filtered by capacitors C63, C60, and C61 to generate an auxiliary DC voltage. This voltage directly serves as the input power supply for the switching converter U7 of the subsequent multi-channel voltage regulator circuit. The output of the seventh pin of the auxiliary winding of transformer T1 is rectified by rectifier diode D9.After filtering by capacitors C59, C53, and C167, this output drives the status indicator LED1 through current-limiting resistor R46. It also serves as the input power supply for the switching converter U6 in the subsequent multi-channel voltage regulator circuit. This converter, composed of resistors R50 and R51, capacitor C66, and clamping diode D15, is connected in parallel between the fifth pin of the primary winding of transformer T1 and the input high voltage VBC1+. This absorbs the voltage spikes generated by the leakage inductance of transformer T1 when power MOSFET U11 is turned off, protecting U11 from breakdown.

[0045] The subsequent multi-channel voltage regulator circuit receives two DC outputs from the preceding flyback converter. Through two stages of switching buck and linear regulation, it provides multiple precise, low-noise voltages to the system. Switching converter U6 uses the voltage rectified by rectifier diode D9 from the flyback auxiliary winding as its input. Its internal pins 5 and 6 are both connected to one end of power inductor L5. The other end of power inductor L5 is the buck output terminal, connected to output filter capacitors C62 and C54, as well as electrolytic capacitor C52. The output voltage is fed back to the second pin of switching converter U6 through resistor R184. The first pin of switching converter U6, after high-frequency noise isolation via ferrite bead FL2, powers the three-terminal regulator U24. The three-terminal regulator U24 converts this to a cleaner 3.3V voltage. Its output is filtered by electrolytic capacitor C160 and capacitors C161, C162, and C163. Resistor R155 is the configuration resistor for the three-terminal regulator U24. The converter U7 uses the 4V voltage rectified by the flyback secondary rectifier diode D11 as its input. Its internal fifth and sixth pins are both connected to one end of the power inductor L3. The output of the other end of the power inductor L3 is filtered by capacitors C92, C91, C55 and electrolytic capacitor C56. The output voltage is fed back to the second pin of U7 through a voltage divider network composed of resistor R45. The first pin of the switching converter U7 is subjected to deep high-frequency filtering by a π-type filter composed of ferrite bead FL6 and capacitors C93 and C94. The first pin of the switching converter U7 is also filtered by resistor R55 and capacitor C73 before serving as the input of the three-terminal regulator U10. The three-terminal regulator U10 performs precise voltage regulation on the input. Its output is then filtered by a multi-stage filtering network composed of ferrite bead FL5 and capacitors C74, C75, C78, ​​C79, C166 and C81 to obtain a high-quality voltage with extremely low noise. The grounding terminal of this module is connected to the system power ground PGND.

[0046] like Figure 13 As shown, the IPM module consists of a level converter U14 and an intelligent power chip U3. It converts the PWM signal of the main microcontroller into three-phase AC power to drive the servo motor, realizes a reliable interface between the control signal and the power stage, and has complete electrical protection functions. It is the core guarantee for the safe and stable operation of the driver.

[0047] like Figure 14 As shown, the collaborative microcontroller consists of a collaborative chip U15 with model number AT32F415CBT7.

[0048] like Figure 15 As shown, the touch screen communication module is a dedicated isolated communication channel between the collaborative microcontroller and the touch screen controller. The touch screen communication module uses a combination of digital isolator U22 and RS-485 transceiver U21 to securely and reliably transmit the instructions and data of the collaborative microcontroller to the touch screen control unit.

[0049] like Figure 16 As shown, the main microcontroller consists of a main control chip U8 with the model number AT32F413RCT7.

[0050] Of course, in addition to the above embodiments, this utility model may have other various embodiments. Without departing from the essential technical solution of this utility model, those skilled in the art can make various corresponding changes and modifications based on this utility model, and these changes or modifications are equivalent to the technical solution in this patent. Therefore, these corresponding changes and modifications should all fall within the protection scope of the appended claims of this utility model, and the utility model creation is in line with the applicant's actual R&D capabilities and resource conditions.

Claims

1. A servo punch press driver control circuit, characterized in that: The system includes a main microcontroller, a cooperating microcontroller, an IPM module, a rectifier and filter module, a power supply module, a brake resistor control module, a phase current detection module, a signal conditioning module, a temperature sensor detection module, a fan drive module, an isolation communication module, an encoder communication module, a communication power isolation module, and a touch screen communication module. The IPM module drives the servo motor, the touch screen communication module connects to an external touch screen, the encoder communication module connects to an external motor encoder, the brake resistor control module connects to an external brake resistor, the output of the rectifier and filter module forms a high-voltage DC bus, the fan drive module connects to an external cooling fan, and the temperature sensor detection module connects to an external temperature sensor. The power supply module's input, the IPM module's power input, and the brake resistor control module are also included. The power input terminals of all modules are connected to the high-voltage DC bus. The output terminals of the phase current detection module and the temperature sensor detection module are both connected to the input terminals of the main microcontroller. The output terminals of the main microcontroller are respectively connected to the input terminals of the IPM module, the brake resistor control module, and the fan drive module. The output terminal of the signal conditioning module is connected to the input terminal of the cooperating microcontroller. The cooperating microcontroller communicates with the external touchscreen and the external motor encoder through the touchscreen communication module and the encoder communication module, respectively. The feedback information from the external motor encoder is processed by the cooperating microcontroller and then transmitted to the main microcontroller through the isolation communication module. The communication power isolation module provides isolated operating power for the isolation communication module, the encoder communication module, and the touchscreen communication module.

2. The servo punch press driver control circuit according to claim 1, characterized in that: The IPM module includes a level converter and a smart power chip. The input terminal of the level converter is connected to the main microcontroller, and the output terminal of the level converter is connected to the control terminal of the smart power chip. The power output terminal of the smart power chip is used to drive the servo motor.

3. The servo punch press driver control circuit according to claim 1, characterized in that: The braking resistor control module includes a PWM controller and a power switch. The main microcontroller is connected to and controls the PWM controller, and the PWM controller is connected to and controls the power switch. The power switch is connected in series between the external braking resistor and the high-voltage DC bus.

4. The servo punch press driver control circuit according to claim 1, characterized in that: The phase current detection module includes a voltage detection circuit and a current detection circuit. The voltage detection circuit is used to sample the voltage of the high-voltage DC bus and output it to the main microcontroller. The current detection circuit is used to sample the phase current of the servo motor output by the IPM module and output it to the main microcontroller.

5. The servo punch press driver control circuit according to claim 1, characterized in that: The signal conditioning module includes a reference voltage generation circuit and at least one differential sampling circuit. The differential sampling circuit includes a differential amplifier and a filter circuit, which amplifies and filters the externally input security differential signal and converts it into a single-ended voltage signal for output to the cooperative microcontroller.

6. The servo punch press driver control circuit according to claim 1, characterized in that: The rectifier and filter module includes an input filter, a rectifier bridge, a surge suppression circuit, and a controlled relay connected in sequence. The control coil of the controlled relay is driven by the main microcontroller.

7. The servo punch press driver control circuit according to claim 1, characterized in that: The power module includes an isolated flyback converter and a subsequent multi-channel voltage regulator circuit. The isolated flyback converter converts the high-voltage DC input into multiple isolated DC outputs. The subsequent multi-channel voltage regulator circuit includes at least one switching buck circuit and a linear voltage regulator circuit to generate the required multiple low-voltage power supplies.

8. The servo punch press driver control circuit according to claim 1, characterized in that: The fan drive module includes an optocoupler isolation circuit and a power switch circuit. The main microcontroller controls the switching of the power switch circuit through the optocoupler isolation circuit to drive the external cooling fan.

9. The servo punch press driver control circuit according to claim 1, characterized in that: The temperature sensor detection module includes a voltage divider sampling circuit and a signal protection circuit. The voltage divider sampling circuit and the external temperature sensor form a voltage divider network. The signal protection circuit is used to limit the signal voltage input to the main microcontroller.

10. The servo punch press driver control circuit according to claim 1, characterized in that: The main microcontroller is model AT32F413RCT7, and the cooperating microcontroller is model AT32F415CBT7.

Images