Controllable high-voltage driving circuit system

Abstract

The utility model relates to the technical field of driving circuits, in particular to a controllable high-voltage driving circuit system, which comprises a controllable high-voltage driving circuit, an MCU (Microprogrammed Control Unit), a power supply circuit and a switch element, the controllable high-voltage driving circuit comprises a high-voltage driving circuit; the power supply circuit comprises an AC220 power supply circuit; the input end of the high-voltage driving circuit is connected with the MCU, and the output end of the high-voltage driving circuit is connected with the thyristor; the input end of the AC220 power supply circuit is connected with commercial power, and the output end of the AC220 power supply circuit is connected with the thyristor; the MCU is used for sending a control signal to the high-voltage driving circuit; the high-voltage driving circuit is used for receiving a control signal from the MCU and isolating and converting the control signal into a signal capable of driving a thyristor switch; the switch element is used for controlling the on-off of an AC380 power supply circuit; the AC220 power supply circuit is used for carrying out voltage conversion on the commercial power.

Description

Technical Field

[0001] The utility model relates to the technical field of drive circuits, and particularly relates to a controllable high-voltage drive circuit system. Background Art

[0002] In the current field of power electronics and automation control, the design and application of high-voltage drive circuits face many challenges. Especially in the context of pursuing high efficiency, stability, and reliability, the existing technologies have significant limitations.

[0003] While the existing boost drive circuits can boost the voltage to meet the requirements of high-voltage applications, they generally face the problem of insufficient anti-interference ability. This is mainly because the electromagnetic interference from the power supply, load, or other external environments cannot be effectively suppressed in the circuit design, resulting in the control signal being interfered with, and then affecting the stability of the high-voltage part. In addition, the harmonic problem generated during the boosting process is particularly prominent. Harmonics not only increase the circuit loss but also may cause the device to overheat (temperature exceeding 75 degrees Celsius), seriously affecting the lifespan and operating stability of electronic components, and then reducing the efficiency and reliability of the entire system.

[0004] The current-voltage signal feedback is a key link for the high-voltage drive circuit to achieve precise control. However, many current designs have deficiencies in signal sampling, mainly manifested as the weak anti-interference ability of the sampling circuit to external AC signals, which cannot effectively filter out noise and interference signals, resulting in inaccurate collected data, and then affecting the accuracy of the control algorithm and the stability of the system. This inaccurate feedback signal may also mislead the control strategy, causing the system performance to decline or even malfunction.

[0005] In summary, there are significant deficiencies in the current design and application of high-voltage drive circuits, including poor anti-interference ability of the boost drive circuit and low sampling accuracy of the current-voltage signal feedback circuit. These problems seriously restrict the performance improvement and wide application of high-voltage drive circuits. Therefore, a new high-voltage drive circuit design scheme is urgently needed to solve the above problems and improve the stability, reliability, and safety of the system. Summary of the Utility Model

[0006] In view of the above technical problems, the utility model provides a controllable high-voltage drive circuit system.

[0007] The technical solution for the utility model to solve the above technical problems is as follows:

[0008] A controllable high-voltage drive circuit system includes: a controllable high-voltage drive circuit, an MCU, a power supply circuit, and a switching element; the controllable high-voltage drive circuit includes a high-voltage drive circuit, and the power supply circuit includes an AC380 power supply circuit and an AC220 power supply circuit;

[0009] The input end of the high-voltage drive circuit is connected to the MCU, and the output end of the high-voltage drive circuit is connected to the switching element; the input end of the AC220 power supply circuit is connected to the commercial power, and the output end of the AC220 power supply circuit is connected to the switching element;

[0010] The MCU is used to send control signals to the high-voltage drive circuit; the high-voltage drive circuit is used to receive the control signals from the MCU and isolate and convert the control signals into signals capable of driving the switching element to switch;

[0011] The AC380 power supply circuit is used to provide high-voltage power; the switching element is used to control the on-off of the AC380 power supply circuit; the AC220 power supply circuit is used to convert the voltage of the commercial power and provide a control voltage for the switching element.

[0012] Compared with the prior art, the utility model has the following technical effects:

[0013] The MCU (microcontroller) serves as the control center, sending control signals to the high-voltage drive circuit to achieve precise control of the entire circuit. The high-voltage drive circuit is responsible for receiving the control signals from the microcontroller and isolating and converting the signals through components such as optocouplers to safely drive the switching element. The switching element controls the on-off of the AC380V power supply voltage circuit. The AC220 power supply circuit provides a standard AC 220V power supply, converting and protecting the commercial power through components such as power transformers, varistors, and safety capacitors to ensure the safety and stability of the circuit.

[0014] On the basis of the above technical solutions, the following improvements can be made to the above technical solutions:

[0015] The high-voltage drive circuit includes an integrated circuit chip, a first optocoupler, and a second optocoupler; the input end of the integrated circuit chip is connected to the MCU, the output end of the integrated circuit chip is connected to the input ends of the first optocoupler and the second optocoupler, and the output ends of the first optocoupler and the second optocoupler are connected to the switching element.

[0016] The beneficial effect of adopting the above further technical solution is that the switching element is used to control the on-off of the high-voltage power supply. When the electrical signal output by the optocoupler reaches a certain threshold, the switching element will enter the conducting state, allowing the high-voltage power supply to pass through; conversely, when the signal is lower than the threshold, the switching element will turn off, cutting off the high-voltage power supply. The use of optocouplers is the key to electrical isolation in the high-voltage drive circuit, ensuring that the electrical connection between the high-voltage side and the low-voltage side is isolated, thereby protecting the MCU and other low-voltage electronic devices from the impact of the high-voltage power supply.

[0017] Further, the AC220 power supply circuit includes a power transformer, a varistor, a safety capacitor, and a transformer; the varistor and the safety capacitor are connected in parallel between the live wire and the neutral wire, the live wire and the neutral wire are connected to the input ends of the transformer and the power transformer, and the output end of the power transformer is connected to a switching element.

[0018] The beneficial effects of adopting the above further technical solution are as follows: the commercial power AC220 voltage is converted by the transformer; the varistor plays a role in overvoltage protection in the circuit. When there is an instantaneous overvoltage in the power grid (such as lightning strikes, power grid fluctuations, etc.), the varistor will conduct quickly and divert the overvoltage to the ground, thereby protecting the subsequent circuit from damage; the safety capacitor is installed between the live wire and the neutral wire and is used to filter out high-frequency interference signals in the power grid. These high-frequency interference signals may come from the power grid itself or other electronic devices. If not filtered out, they will interfere with the normal operation of the circuit. The safety capacitor improves the electromagnetic compatibility of the circuit while meeting the safety standards. Adding protection components such as fuses at the input end of the AC220 power supply circuit can prevent abnormal conditions such as overcurrent and overvoltage from damaging the circuit. When there is an abnormal current or voltage in the circuit, the fuse will quickly blow and cut off the circuit, thereby protecting the subsequent circuit and equipment from damage.

[0019] Further, the controllable high-voltage drive circuit further includes a data acquisition and feedback circuit, and the data acquisition and feedback circuit is used to monitor voltage and current signals and feedback the signals to the MCU.

[0020] The beneficial effects of adopting the above further technical solution are as follows: the MCU generates a control signal and sends it to the high-voltage drive circuit; the high-voltage drive circuit receives the control signal, performs isolation conversion, and then drives the switching element to control the on and off of the AC380V power supply voltage circuit; the acquisition and feedback circuit samples the voltage and current signals on the primary and secondary sides of the step-up transformer in real time and feedbacks these signals to the MCU; the MCU adjusts and controls the high-voltage drive circuit in real time according to the feedback signals.

[0021] Further, the controllable high-voltage drive circuit further includes a signal detection circuit and an output control circuit. Both the signal detection circuit and the output control circuit are connected to the MCU; the signal detection circuit is used to receive the status signals of external electrical components; the output control circuit is used to control the on and off of external electrical components according to the control instructions of the MCU.

[0022] The beneficial effects of adopting the above further technical solution are as follows: key parameters such as voltage and current are monitored in real time, and these data are feedback to the MCU for precise control and protection.

[0023] Further, the signal detection circuit includes a seventh optocoupler, an eighth optocoupler, and a logic controller; the input ends of the seventh optocoupler and the eighth optocoupler are both used to connect the status signals of external electrical components and the controller to supply the simulation console, the output ends of the seventh optocoupler and the eighth optocoupler are connected to the input end of the logic controller, and the output end of the logic controller is connected to the MCU.

[0024] The beneficial effect of adopting the above further technical solution is that the signal detection circuit receives various status signals from external electrical components, such as shunt trip signals, alarm signals, oil temperature danger signals, etc., and improves the anti-interference ability of the circuit through opto-isolation or magnetic isolation technology to ensure the accurate transmission of signals. The optocoupler transmits electrical signals through optical signals, which can effectively isolate the input and output circuits and prevent the interference of electrical noise.

[0025] Further, the output control circuit includes a bidirectional bus transmitter, a Darlington transistor array, and an optocoupler. The input end of the bidirectional bus transmitter is connected to the MCU through an interface circuit. The output end of the bidirectional bus transmitter is connected to the input end of the Darlington transistor array. The output end of the Darlington transistor array is connected to the input end of the optocoupler. The output end of the optocoupler is connected to an external electrical component.

[0026] The beneficial effect of adopting the above further technical solution is that the output control circuit realizes the on-off control of external electrical components by controlling the bidirectional bus transmitter, the Darlington transistor array, and multiple optocouplers according to the control instructions of the MCU. The bidirectional bus transmitter receives the control instructions from the MCU and transmits these instructions to the Darlington transistor array after internal logic processing. The Darlington transistor array controls the on-off of external electrical components according to the received instructions. The first optocoupler, the second optocoupler, the third optocoupler, and the fourth optocoupler are respectively used to isolate and control different external electrical components to ensure the accurate transmission of control signals and electrical safety.

[0027] In summary, compared with the prior art, the present invention has the following technical effects:

[0028] The high-voltage drive circuit realizes the control of the AC380 power supply through the coordinated work of components such as integrated circuits, optocouplers, and switching elements. At the same time, through circuits such as data acquisition feedback, signal detection, and output control, the real-time monitoring and remote control of the voltage and current status are realized, improving safety and reliability. In addition, a stable power supply support is provided through the DC power supply circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is the system block diagram of the present invention;

[0030] Figure 2The high-voltage drive circuit of the present utility model;

[0031] Figure 3 The AC220 power supply circuit of the present utility model;

[0032] Figure 4 The data acquisition feedback circuit diagram of the present utility model;

[0033] Figure 5 The signal detection circuit diagram of the present utility model;

[0034] Figure 6 The output control circuit of the present utility model;

[0035] Figure 7 The interface circuit diagram of the present utility model;

[0036] Figure 8 The DC24V power supply circuit diagram of the present utility model;

[0037] Figure 9 The DC5V power supply circuit diagram of the present utility model. Specific embodiments

[0038] The principles and features of the present utility model are described below in conjunction with the accompanying drawings. The examples given are only for explaining the present utility model and are not intended to limit the scope of the present utility model.

[0039] Refer to Figure 1 , A controllable high-voltage drive circuit system, including: a controllable high-voltage drive circuit, an MCU, a power supply circuit, a switching element; the controllable high-voltage drive circuit includes a high-voltage drive circuit, the power supply circuit includes an AC380 power supply circuit, an AC220 power supply circuit; the input end of the high-voltage drive circuit is connected to the MCU, the output end of the high-voltage drive circuit is connected to the switching element; the input end of the AC220 power supply circuit is connected to the mains power, the output end of the AC220 power supply circuit is connected to the switching element; the MCU is used to send a control signal to the high-voltage drive circuit; the high-voltage drive circuit is used to receive the control signal from the MCU and isolate and convert the control signal into a signal capable of driving the switching element to switch; the AC380 power supply circuit is used to provide a high-voltage power supply; the AC380 power supply circuit is connected to a thyristor, the switching element is used to control the on / off of the AC380 power supply circuit; the AC220 power supply circuit is used to convert the voltage of the mains power and provide a control voltage for the switching element; the AC380 power supply circuit is connected to a thyristor, and the switching element is a silicon-controlled rectifier, specifically a thyristor.

[0040] In this embodiment, refer to Figure 2, The high-voltage drive circuit is used to receive the control signal from the MCU, isolate and convert the control signal into a signal capable of driving the thyristor switch, and then realize the control of the AC380 power supply circuit.

[0041] The high-voltage drive circuit includes an integrated circuit chip U13, a first optocoupler U16, and a second optocoupler U17; the input end of the integrated circuit chip U13 is connected to the MCU, the output end of the integrated circuit chip U13 is connected to the input ends of the first optocoupler U16 and the second optocoupler U17, and the output ends of the first optocoupler U16 and the second optocoupler U17 are connected to the AC220 power supply circuit.

[0042] Among them, the integrated circuit chip U13 is a four-channel two-input NAND gate integrated circuit chip, which is used for logical operation to convert the digital control signal of the MCU into a logic level signal suitable for driving the optocoupler. The optocoupler isolates the input end and the output end through an optical signal to achieve electrical isolation and transmission of the signal. In the high-voltage drive circuit, the specific models of the first optocoupler U16 and the second optocoupler U17 are 4N40. Two optocouplers are set up to synchronously control two unilateral thyristors (thyristors) on the periphery, which is used to safely transmit the control signal on the low-voltage side to the high-voltage side to prevent the electrical noise or faults on the high-voltage side from affecting the low-voltage side circuit.

[0043] Specifically, pin 1 and pin 2 of the integrated circuit chip U13 are connected to the MCU through an interface circuit, pin 3, pin 4, and pin 5 are connected to each other, and pin 7, pin 9, pin 10, pin 12, pin 13, and pin 14 are grounded. Among them, pin 14 is grounded after being connected in series with the capacitor C28 and is connected to the 5V power supply; pin 6 is connected to the resistor R33, the capacitor C29, and the triode Q1. The triode Q1 is an NPN type. The collector of the triode Q1 is connected to the first optocoupler U16, the emitter is grounded, and a resistor R34 and a diode D11 are connected in parallel between the base and the emitter;

[0044] Pin 1 of the first optocoupler U16 is connected to pin 2 of the second optocoupler U17, pin 2 of the first optocoupler U16 is connected to the triode Q1, and pin 5 of the first optocoupler U16 is connected to the AC220 power supply circuit; a parallel connection of the resistor R40 and the capacitor C39, a parallel connection of the resistor R43 and the capacitor C41, the resistor R48, and a parallel connection of the resistor R51 and the capacitor C45 are connected in series between pin 4 and pin 6, and then connected to the thyristor through an interface circuit;

[0045] One end of resistor R37 is connected to pin 1 of the second optocoupler U17, and the resistor R37 is connected to a parallel combination of a polarized capacitor C31 and a capacitor C30; pin 5 of the second optocoupler U17 is connected to the AC220 power supply circuit; a parallel combination of a resistor R39 and a capacitor C38, a parallel combination of a resistor R42 and a capacitor C40, a resistor R47, and a parallel combination of a resistor R50 and a capacitor C44 are connected in series between pins 4 and 6, and then connected to a thyristor through an interface circuit.

[0046] The high-voltage drive circuit is used to control the thyristor through the MCU to realize the control of the AC380 power supply circuit. The MCU sends a control signal to the integrated circuit chip U13 through the interface circuit. After the integrated circuit chip U13 performs logical operations, a control signal is output to the triode Q1 through pin 6. Q1 acts as a switch to transmit the signal to the first optocoupler U16 and the second optocoupler U17. The optocoupler isolates and transmits the control signal on the low-voltage side to the high-voltage side to control the on and off of the thyristor, thereby realizing the control of the AC380 power supply circuit.

[0047] In this embodiment, referring to Figure 3 , the AC220 power supply circuit is used to convert the AC220 power supply to provide a control voltage for the thyristor.

[0048] The AC220 power supply circuit includes a power transformer, a varistor RX1, a safety capacitor CX1 and a transformer. The isolation transformer includes T1 and T2, where T1 is S12 (12VA) and T2 is S0.5 (0.5VA).

[0049] Among them, the AC220 power supply circuit converts the mains voltage into the voltage required inside the circuit through the power transformer. T1 (S12, 12VA) is a transformer with a relatively large power, which is used to provide the main power conversion function. T2 (S0.5, 0.5VA) is a transformer with a relatively small power, which is used to provide an auxiliary power supply or a signal power supply. The varistor RX1 is a component used to protect the circuit from instantaneous overvoltage (such as lightning strikes, power grid fluctuations, etc.). When the voltage exceeds its threshold, the varistor will conduct quickly and divert the overvoltage to the ground, thereby protecting the subsequent circuit. The safety capacitor CX1 is installed between the live wire and the neutral wire, which is used to filter out high-frequency interference signals in the power grid, and at the same time meet the safety standards to prevent the risk of electric shock. The thyristor is a silicon-controlled rectifier, and its conduction state is adjusted through a control signal, such as a signal from the MCU, so as to control the on and off of the AC380 power supply. Protection components such as a fuse F1 are added at the input end of the AC220 power supply circuit to prevent damage to the circuit caused by abnormal conditions such as overcurrent and overvoltage.

[0050] Specifically, a varistor RX1 and a safety capacitor CX1 are connected in parallel between the live wire and the neutral wire. The 1st pin of the transformer is connected to the live wire, the 2nd pin of the transformer is respectively connected to the 6th pin of T1 and the 1st pin of T2, the 3rd pin of the transformer is respectively connected to the 1st pin of T1 and the 4th pin of T2, and the 4th pin of the transformer is connected to the neutral wire; the 8th and 12th pins of T1 are respectively connected to thyristors through an interface circuit, and the 7th and 11th pins of T1 are connected to a high-voltage drive circuit; the 7th pin of T2 is connected to the MCU through an interface circuit, and the 7th pin of T2 is connected to 0V.

[0051] In this embodiment, the step-up transformer is between the AC380 power supply circuit and the high-voltage load. Refer to Figure 4 , the data acquisition and feedback circuit is used to monitor the voltage and current signals on the primary and secondary sides of the step-up transformer, and feedback the signals to the MCU. The MCU outputs pulses to the high-voltage drive circuit according to the feedback signals for real-time adjustment and control to perform closed-loop control. The data acquisition and feedback circuit includes a first data acquisition and feedback circuit, a second data acquisition and feedback circuit, a third data acquisition and feedback circuit, and a fourth data acquisition and feedback circuit. The sampling signal board samples the primary voltage and current signals and the secondary voltage and current signals respectively, and its function is to monitor the current primary and secondary voltage and current, form a closed-loop feedback, and respectively obtain signals from the primary side (low-voltage side) and the secondary side (high-voltage side) of the step-up transformer.

[0052] The first data acquisition and feedback circuit is used for signal acquisition, isolation, amplification and transmission, and is mainly used to safely transmit the TR / SET signal in the DCS system (Distributed Control System) to the MCU for processing. The first data acquisition and feedback circuit includes a first single-channel operational amplifier N8, a third optocoupler U19, and a second single-channel operational amplifier N9. The input end of the first single-channel operational amplifier N8 is connected to the DCS system TR / SET, the output end of the first single-channel operational amplifier N8 is connected to the input end of the third optocoupler U19, the output end of the third optocoupler U19 is connected to the input end of the second single-channel operational amplifier N9, and the output end of the second single-channel operational amplifier N9 is connected to the MCU. The TR / SET signal in the DCS system (Distributed Control System) is a safety interlock reset signal, which detects whether the secondary voltage reaches the set value and feeds back data to the DCS system.

[0053] The TR / SET signal of the DCS system is first collected by the first single-channel operational amplifier N8. The first single-channel operational amplifier N8 preliminarily amplifies the TR / SET signal to increase the signal amplitude and signal-to-noise ratio. The amplified signal is electrically isolated by the third optocoupler U19 to ensure that the high voltage and electrical noise of the DCS system do not affect the subsequent circuits. The isolated signal is further amplified by the second single-channel operational amplifier N9 to meet the requirements of the MCU for the input signal level. The finally amplified signal is transmitted to the corresponding input pin of the MCU for subsequent processing by the MCU.

[0054] Specifically, the TR / SET of the DCS system is sequentially connected to the diode D19, one end of the parallel-connected resistor R52 and capacitor C46, and the resistor R53, and then connected to the 3rd pin of the third optocoupler U19, and at the same time connected to the 3rd pin of the first single-channel operational amplifier N8. The first single-channel operational amplifier N8 is LM321. The 1st and 2nd pins of the first single-channel operational amplifier N8 are connected to the controller-supplied analog console through the capacitor C48 to provide a feedback voltage. The 5th pin of the first single-channel operational amplifier N8 is connected to the controller-supplied analog console. A capacitor C47 is connected between the 3rd pin and the 4th pin of the first single-channel operational amplifier N8. The 4th pin of the first single-channel operational amplifier N8 is connected to the 1st pin of the third optocoupler U19 in series through the resistor R54. The 2nd pin of the third optocoupler U19 is connected to the controller-supplied analog console. The 4th pin of the third optocoupler U19 is grounded. The 5th pin of the third optocoupler U19 is connected to 0V. The 6th pin of the third optocoupler U19 is connected to the 3rd pin of the second single-channel operational amplifier N9. A capacitor C50 and a resistor R55 are connected in parallel between the 3rd and 4th pins of the second single-channel operational amplifier N9. The 1st and 2nd pins of the second single-channel operational amplifier N9 are connected to 5V1 through the capacitor C48. The 5th pin of the second single-channel operational amplifier N9 is connected to 5V1. The 4th pin of the second single-channel operational amplifier N9 is connected to the diode D20 and then connected to the MCU through the interface circuit. Among them, 5V1 is Figure 9 the DC5V power supply in

[0055] The second data acquisition feedback circuit includes an operational amplifier N5, a third single-channel operational amplifier N6, a fourth optocoupler U7, and a fourth single-channel operational amplifier N7. The input end of the operational amplifier N5 is connected to the sampling signal board and the TR / SET of the DCS system. The input end of the third single-channel operational amplifier N6 is connected to the output end of the operational amplifier N5. The output end of the third single-channel operational amplifier N6 is connected to the input end of the fourth optocoupler U7. The output end of the fourth optocoupler U7 is connected to the input end of the fourth single-channel operational amplifier N7. The output end of the fourth single-channel operational amplifier N7 is connected to the MCU.

[0056] The operational amplifier N5 receives signals from the sampling signal board and the DCS system TR / SET and performs preliminary amplification; the third single-channel operational amplifier N6 further amplifies the signal output by the operational amplifier N5 to increase the amplitude and signal-to-noise ratio of the signal; the amplified signal is electrically isolated by the fourth optocoupler U7 to ensure that the high voltage and electrical noise of the pre-stage circuit do not affect the subsequent circuit; the isolated signal is finally amplified by the fourth single-channel operational amplifier N7 and transmitted to the corresponding input pin of the MCU.

[0057] The sampling signal board signal is connected to pin 2 of the operational amplifier N5 after passing through the series resistor R11, and the sampling signal board signal is connected to pin 5 of the operational amplifier N5 after passing through the series resistor R17; the DCS system TR / SET received signal is connected to one end of the bidirectional transient suppression diode TV1 after passing through the series resistor R38, and the other end of the bidirectional transient suppression diode TV1 is connected to pin 2 of the operational amplifier N5 after passing through the series resistor R11. Similarly, the other end of the bidirectional transient suppression diode TV1 is connected to pin 5 of the operational amplifier N5 after passing through the series resistor R17; pins 8 and 9 of the operational amplifier N5 are connected to resistor R18 and then connected to pin 3 of the fifth optocoupler U4, and at the same time connected to pin 3 of the third single-channel operational amplifier N6, and the third single-channel operational amplifier N6 is LM321; pins 1 and 2 of the third single-channel operational amplifier N6 are connected to the controller to supply the analog console after connecting the capacitor C14, pin 5 of the third single-channel operational amplifier N6 is connected to the controller to supply the analog console, a capacitor C13 is connected between pin 3 and pin 4 of the third single-channel operational amplifier N6, and pin 4 of the third single-channel operational amplifier N6 is connected to pin 1 of the third optocoupler U19 after passing through the series resistor R21; pin 2 of the fourth optocoupler U7 is connected to the controller to supply the analog console; pin 4 of the third optocoupler U19 is grounded; pin 5 of the fourth optocoupler U7 is connected to 0V; pin 6 of the fourth optocoupler U7 is connected to pin 3 of the second single-channel operational amplifier N9, a capacitor C23 and a resistor R24 are connected in parallel between pin 3 and pin 4 of the second single-channel operational amplifier N9, pins 1 and 2 of the second single-channel operational amplifier N9 are connected to the capacitor C14 and then connected to 5V1, pin 5 of the second single-channel operational amplifier N9 is connected to 5V1, and pin 4 of the second single-channel operational amplifier N9 is connected to the diode D23 and then connected to the MCU through the interface circuit.

[0058] The third data acquisition feedback circuit includes a fifth single-channel operational amplifier N3, a fifth optocoupler U4, and a sixth single-channel operational amplifier N4. The input terminal of the fifth single-channel operational amplifier N3 is connected to the sampling signal board. The output terminal of the fifth single-channel operational amplifier N3 is connected to the input terminal of the fifth optocoupler U4. The output terminal of the fifth optocoupler U4 is connected to the input terminal of the sixth single-channel operational amplifier N4. The output terminal of the sixth single-channel operational amplifier N4 is connected to the MCU.

[0059] The fifth single-channel operational amplifier N3 receives signals from the sampling signal board; the fifth single-channel operational amplifier N3 preliminarily amplifies the sampling signals to increase the amplitude and signal-to-noise ratio of the signals; the amplified signals are electrically isolated through the fifth optocoupler U4 to ensure that the high voltage and electrical noise on the sampling signal board do not affect the subsequent circuits; the isolated signals are further amplified by the sixth single-channel operational amplifier N4 to meet the requirements of the MCU for the input signal level; the finally amplified signals are transmitted to the corresponding input pins of the MCU for subsequent processing by the MCU. In the third data acquisition feedback circuit, the sampling signal board monitors the secondary voltage and current signals, which are taken from the secondary winding of the step-up transformer.

[0060] Specifically, the sampling signal board is connected in series with a Schottky diode TV2, a resistor R13, and a resistor R16, and a resistor R10 is connected in parallel with the Schottky diode and the resistor R13. The ground is connected between the Schottky diode TV2 and the resistor R13, and then the 3rd pin of the fifth optocoupler U4 is connected, and at the same time, the 3rd pin of the fifth single-channel operational amplifier N3 is connected. The fifth single-channel operational amplifier N3 is LM321. The 1st pin and the 2nd pin of the fifth single-channel operational amplifier N3 are connected to the controller to supply the analog stage after connecting a capacitor C12. The 5th pin of the fifth single-channel operational amplifier N3 is connected to the controller to supply the analog stage. A capacitor C11 is connected between the 3rd pin and the 4th pin of the fifth single-channel operational amplifier N3. The 4th pin of the fifth single-channel operational amplifier N3 is connected to the 1st pin of the fifth optocoupler U4 after being connected in series with a resistor R54. The 2nd pin of the fifth optocoupler U4 is connected to the controller to supply the analog stage. The 4th pin of the fifth optocoupler U4 is grounded. The 5th pin of the fifth optocoupler U4 is connected to 0V. The 6th pin of the fifth optocoupler U4 is connected to the 3rd pin of the second single-channel operational amplifier N9. A capacitor C23 and a resistor R23 are connected in parallel between the 3rd pin and the 4th pin of the second single-channel operational amplifier N9. The 1st pin and the 2nd pin of the second single-channel operational amplifier N9 are connected to the capacitor C12 and then connected to 5V1. The 5th pin of the second single-channel operational amplifier N9 is connected to 5V1. The 4th pin of the second single-channel operational amplifier N9 is connected to a diode D21 and then connected to the MCU through an interface circuit. Through the coordinated operation of the sampling signal board, the Schottky diode, the resistor, the optocoupler, and the two single-channel operational amplifiers, the sampling, isolation, amplification, and final processing of the signal are realized, and finally the processed signal is transmitted to the MCU for further control or processing.

[0061] The fourth data acquisition feedback circuit includes a seventh single-channel operational amplifier N1, a sixth optocoupler U3, and an eighth single-channel operational amplifier N2. The input end of the seventh single-channel operational amplifier N1 is connected to the sampling signal board. The output end of the seventh single-channel operational amplifier N1 is connected to the input end of the sixth optocoupler U3. The output end of the sixth optocoupler U3 is connected to the input end of the eighth single-channel operational amplifier N2. The output end of the eighth single-channel operational amplifier N2 is connected to the MCU. In the fourth data acquisition feedback circuit, the sampling signal board is taken from the secondary side (high-voltage side) of the step-up transformer.

[0062] The sampling signal board provides the signal to be collected. The signal enters the seventh single-channel operational amplifier N1 through the resistor R9 and is output after preliminary amplification. The amplified signal is electrically isolated through the sixth optocoupler U3. The isolated signal enters the eighth single-channel operational amplifier N2 for further amplification. The finally amplified signal is protected by a diode D22 and then transmitted to the MCU for further processing.

[0063] Specifically, the signal template is connected to the Schottky diode TV3, and the other end of the Schottky diode TV3 is grounded; the signal template is connected to one end of the resistor R9, and the other end of the resistor R9 is connected to one end of the resistor R12 and one end of the resistor R15. The other end of the resistor R12 is grounded; the other end of the resistor R15 is connected to the 3rd pin of the sixth optocoupler U3 and at the same time connected to the 3rd pin of the first single-channel operational amplifier N8. The seventh single-channel operational amplifier N1 is LM321; the 1st and 2nd pins of the seventh single-channel operational amplifier N1 are connected to the controller supply analog stage after being connected to the capacitor C7. The 5th pin of the seventh single-channel operational amplifier N1 is connected to the controller supply analog stage. A capacitor C10 is connected between the 3rd pin and the 4th pin of the seventh single-channel operational amplifier N1. The 4th pin of the seventh single-channel operational amplifier N1 is connected to the 1st pin of the sixth optocoupler U3 after being connected in series with the resistor R54; the 2nd pin of the sixth optocoupler U3 is connected to the controller supply analog stage; the 4th pin of the sixth optocoupler U3 is grounded; the 5th pin of the sixth optocoupler U3 is connected to 0V; the 6th pin of the sixth optocoupler U3 is connected to the 3rd pin of the eighth single-channel operational amplifier N2. A capacitor C19 and a resistor R22 are connected in parallel between the 3rd pin and the 4th pin of the eighth single-channel operational amplifier N2. The 1st and 2nd pins of the eighth single-channel operational amplifier N2 are connected to 5V1 after being connected to the capacitor C18. The 5th pin of the eighth single-channel operational amplifier N2 is connected to 5V1. The 4th pin of the eighth single-channel operational amplifier N2 is connected to the diode D22 and then connected to the MCU through the interface circuit. Through the coordinated operation of the signal template, Schottky diode, resistor, optocoupler and two single-channel operational amplifiers, the sampling, amplification, isolation and final processing of the signal are realized, and finally the processed signal is safely transmitted to the MCU for further control or processing.

[0064] In the high-voltage drive system, the reliable transmission and closed-loop feedback of the status signals (such as switch status, protection signals, etc.) of external electrical components are crucial for ensuring system safety. If the status signals of external electrical components fail to form a reliable closed-loop feedback mechanism, the system will not be able to respond to abnormal situations in a timely manner and take protective measures.

[0065] In this embodiment, referring to Figure 5 and Figure 6 also includes a signal detection circuit and an output control circuit; the signal detection circuit is used to receive the status signals of external electrical components, and each interface has an opto-isolation or magnetic isolation function to improve the anti-interference ability; the output control circuit is used to control the on-off of external electrical components according to the control instructions. The external signals are digital quantity signals, such as safety interlock signals, temperature signals, vibration signals, remote control signals, etc., for the detection of the safe and reliable operation of the system. In addition, according to the working conditions, redundant design is carried out to increase the spare ports.

[0066] The signal detection circuit includes the seventh optocoupler U1, the eighth optocoupler U2 and the logic controller U5; the input ends of the seventh optocoupler U1 and the eighth optocoupler U2 are both used to connect the status signals of external electrical components and the controller to supply the analog console, the output ends of the seventh optocoupler U1 and the eighth optocoupler U2 are connected to the input end of the logic controller U5, and the output end of the logic controller U5 is connected to the MCU; the status signals of the external electrical components may include shunt trip signals, alarms, outputs (spares), CO alarms, dangerous oil temperature signals, I / O input signals (spares), remote controllable signals, etc.

[0067] The signal detection circuit is used to receive various status signals from external electrical components, such as shunt trip signals, alarm signals, dangerous oil temperature signals, etc., and improve the anti-interference ability of the circuit through opto-isolation or magnetic isolation technology to ensure the accurate transmission of signals. The optocoupler transmits electrical signals through optical signals, which can effectively isolate the input and output circuits and prevent the interference of electrical noise. The logic controller U5 is used to process the signals from the seventh optocoupler U1 and the eighth optocoupler U2, perform corresponding logical judgments according to the status of the signals, and transmit the results to the output MCU.

[0068] The output control circuit includes a bidirectional bus transmitter U6, a Darlington transistor array U8, a first optocoupler U9, a second optocoupler U10, a third optocoupler U11 and a fourth optocoupler U12. The input end of the bidirectional bus transmitter U6 is connected to the MCU through an interface circuit. The output end of the bidirectional bus transmitter U6 is connected to the input end of the Darlington transistor array U8. The output end of the Darlington transistor array U8 is respectively connected to the input ends of the first optocoupler U9, the second optocoupler U10, the third optocoupler U11 and the fourth optocoupler U12. The output ends of the first optocoupler U9, the second optocoupler U10, the third optocoupler U11 and the fourth optocoupler U12 are connected to different external electrical components.

[0069] The output control circuit realizes the on-off control of external electrical components by controlling the bidirectional bus transmitter U6, the Darlington transistor array U8 and multiple optocouplers according to the control instructions of the MCU. The bidirectional bus transmitter U6 receives the control instructions from the MCU, and after processing these instructions through internal logic, transmits them to the Darlington transistor array U8. The Darlington transistor array U8 controls the on-off of external electrical components according to the received instructions. The first optocoupler U9, the second optocoupler U10, the third optocoupler U11 and the fourth optocoupler U12 are respectively used to isolate and control different external electrical components to ensure the accurate transmission of control signals and electrical safety.

[0070] In this embodiment, refer to Figure 7, the interface circuit includes intermediate connectors P2 and P3. The interface circuit is respectively connected to the MCU, the host computer, the AC220 power supply circuit, the high-voltage drive circuit, the output control circuit, the signal detection circuit, the data acquisition and feedback circuit, thyristors, etc. P2 is an IDC piercing connector, 2.54mm, 2*20P; P3 is a pluggable terminal block, 5.08mm, 2*20P.

[0071] Pin 1 of P2 is connected to the host computer communication 485-, pin 2 of P2 is connected to the host computer communication 485+, pin 3 of P2 is connected to the host computer communication GND, pins 5, 6, 7, and 8 of P2 are connected to the isolation transformer T2, pins 9, 10, 12, 14, 16, 17, and 18 of P2 are connected to the relay, pin 12 of P2 is connected to the centralized control system, pins 23 and 24 of P2 are connected to the DCS system TR / SET, pins 26 - 30 of P2 are connected to the sampling signal board, and pins 38 and 40 of P2 are connected to the thyristors.

[0072] Table 1 Pin numbers of P2 and corresponding signal names

[0073]

[0074]

[0075]

[0076] Table 2 Pin numbers of P3 and corresponding signal names

[0077]

[0078]

[0079] In this embodiment, referring to Figure 8 and Figure 9 , it further includes a DC circuit, which is used to provide voltage for each circuit, and it includes a DC5V power supply circuit and a DC24V power supply circuit.

[0080] The high-voltage drive circuit designed by the present utility model, combined with the dust removal working conditions of the power plant and the required signal information, after selecting appropriate mechanical devices such as electrodes, the high-voltage electrostatic dust removal equipment formed by supporting is suitable for applications such as dust removal, fog removal, dehydration, impurity separation, and recovery of rare metals and other raw materials in factories. It is an important equipment for environmental protection and comprehensive utilization development.

[0081] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A controllable high voltage driving circuit system, characterized in that: include: A controllable high-voltage drive circuit, an MCU, a power supply circuit, and a switch element; the controllable high-voltage drive circuit includes a high-voltage drive circuit, and the power supply circuit includes an AC380 power supply circuit and an AC220 power supply circuit; The input end of the high-voltage drive circuit is connected to the MCU, and the output end of the high-voltage drive circuit is connected to the switch element; the input end of the AC220 power supply circuit is connected to the mains, and the output end of the AC220 power supply circuit is connected to the switch element; The MCU is used to send a control signal to the high-voltage drive circuit; The high-voltage driving circuit is used to receive a control signal from the MCU and to isolate and convert the control signal into a signal capable of driving the switch element to switch on and off; The AC380 power supply circuit is used to provide a high voltage power supply; the switch element is used to control the on and off of the AC380 power supply circuit; the AC220 power supply circuit is used to convert the voltage of the mains power and provide a control voltage to the switch element.

2. A controllable high voltage driving circuit system according to claim 1, characterized in that: The high-voltage driving circuit includes an integrated circuit chip, a first photocoupler and a second photocoupler; the input end of the integrated circuit chip is connected to the MCU, the output end of the integrated circuit chip is connected to the input end of the first photocoupler and the input end of the second photocoupler, and the output end of the first photocoupler and the output end of the second photocoupler are connected to the switch element.

3. The controllable high-voltage driving circuit system according to claim 1, characterized in that: The AC220 power supply circuit includes a power transformer, a varistor, a safety capacitor and a transformer; the varistor and the safety capacitor are connected in parallel between the live wire and the neutral wire, the live wire and the neutral wire are connected to the transformer and the input end of the power transformer, and the output end of the power transformer is connected to the switching element.

4. The controllable high-voltage driving circuit system according to claim 1, characterized in that: The controllable high-voltage drive circuit also includes a data acquisition feedback circuit, which is used to monitor voltage and current signals and feed back the signals to the MCU.

5. The controllable high-voltage driving circuit system according to claim 4, characterized in that: The data acquisition feedback circuit includes two single-channel operational amplifiers and an optocoupler. The first single-channel operational amplifier is used to preliminarily amplify the collected signal to improve the amplitude and signal-to-noise ratio of the signal; the optocoupler is used to electrically isolate the amplified signal; the second single-channel operational amplifier is used to further amplify the isolated signal, and the final amplified signal is transmitted to the MCU.

6. The controllable high-voltage driving circuit system according to claim 1, characterized in that: The controllable high-voltage drive circuit also includes a signal detection circuit and an output control circuit, both of which are connected to the MCU; the signal detection circuit is used to receive status signals of external electrical components; the output control circuit is used to control the on and off of external electrical components according to the control instructions of the MCU.

7. The controllable high-voltage driving circuit system according to claim 6, characterized in that: The signal detection circuit includes a seventh photoelectric coupler, an eighth photoelectric coupler and a logic controller; the input ends of the seventh photoelectric coupler and the eighth photoelectric coupler are used to connect the status signal of the external electrical component and the controller to supply the simulation platform, the output ends of the seventh photoelectric coupler and the eighth photoelectric coupler are connected to the input end of the logic controller, and the output end of the logic controller is connected to the MCU.

8. The controllable high-voltage driving circuit system according to claim 6, characterized in that: The output control circuit includes a bidirectional bus transmitter, a Darlington transistor array, and an optocoupler. The input end of the bidirectional bus transmitter is connected to the MCU through an interface circuit, the output end of the bidirectional bus transmitter is connected to the input end of the Darlington transistor array, the output end of the Darlington transistor array is connected to the input end of the optocoupler, and the output end of the optocoupler is connected to an external electrical component.

9. The controllable high-voltage driving circuit system according to claim 1, characterized in that: The power supply circuit further includes a DC power supply circuit, and the DC power supply circuit is used to provide power to various circuits.

10. The controllable high-voltage driving circuit system according to claim 1, characterized in that: The switch element is a thyristor.

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