Automatic auxiliary starting system for intermediate frequency equipment

Abstract

The utility model discloses a kind of automatic auxiliary starting system of intermediate frequency equipment, and the utility model is as follows: sampling detection unit gathers load impedance signal, and signal is transmitted to pulse signal to processor after processing, processor receives pulse signal and compares with reserved signal data, and according to comparison result control executor operation;Power unit includes two parallel switching power supplies, and switching power supply is used to power supply for sampling detection unit, processor and executor.The utility model is by setting sampling detection unit real-time sampling equipment main loop impedance signal, and output pulse signal to processor after processing by signal processing circuit, processor compares with preset parameter by received pulse signal, and according to comparison result to control the operation of executor, realize the operation guarantee of domestic large-tonnage intermediate frequency equipment in equipment starting use, eliminate the difficult problem of starting caused by impedance matching degree not high of intermediate frequency equipment.

Description

Technical Field

[0001] This utility model belongs to the field of medium frequency equipment technology, and in particular relates to an automatic auxiliary start-up system for medium frequency equipment. Background Technology

[0002] The common technologies used in the domestic and international markets for starting large-tonnage intermediate frequency (IF) induction melting furnaces include fixed-angle starting, impact starting, and frequency sweep starting. For large-tonnage IF equipment, the impedance matching between the main circuit capacitor and the induction coil is crucial; all three starting methods with high matching can effectively start the IF equipment. However, under light or heavy load conditions, starting large-tonnage IF equipment becomes difficult, and sometimes it cannot be started at all.

[0003] Because the impedance matching degree of the main circuit resonant capacitor and the induction coil changes with the load during the startup process of large-tonnage intermediate frequency equipment, it is common to encounter situations in daily production where the intermediate frequency equipment fails to start even when there are no faults, which seriously affects the normal production of the factory. In order to solve this technical problem, this application uses inverter voltage to detect load impedance changes. By detecting the main circuit resonant waveform and comparing it with the set parameters, the microcontroller program adjusts and calculates a suitable startup trigger pulse, thereby ensuring that the startup of the equipment is not affected by the main circuit impedance changes, and ensuring the normal production of large-tonnage intermediate frequency equipment. Summary of the Invention

[0004] The purpose of this utility model is to provide an automatic auxiliary start-up system for medium-frequency equipment. By setting up a sampling and detection unit to sample the impedance signal of the main circuit of the equipment in real time, and processing it through a signal processing circuit, a pulse signal is output to the processor. The processor compares the received pulse signal with preset parameters and controls the operation of the actuator according to the comparison result, thereby ensuring the operation of large-tonnage medium-frequency equipment in China during equipment start-up and eliminating the problem of difficult start-up caused by poor impedance matching of medium-frequency equipment.

[0005] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution: This utility model relates to an automatic auxiliary start-up system for intermediate frequency equipment, comprising a sampling and detection unit that collects load impedance signals, processes the signals, and transmits them to a pulse signal processor. The processor receives the pulse signal, compares it with pre-reserved signal data, and controls the actuator to operate based on the comparison result. A power supply unit includes two parallel switching power supplies used to power the sampling and detection unit, the processor, and the actuator. The sampling and detection unit includes a power supply circuit and a signal processing circuit. The power supply circuit provides a ±15V DC voltage source for the signal processing power supply. The signal processing circuit includes a chip U1, with pin 1 of chip U1 sequentially... Resistors R10 and R9 are connected in series to pin 8 of chip U1. Pin 3 of chip U1 is connected in series with resistor R4 to pin 1 of transformer T2. Pin 2 of transformer T2 is connected to the main circuit load. Pin 2 of chip U1 is connected in series with resistor R3 to pin 1 of transformer T1. Pin 2 of transformer T1 is also connected to the main circuit load. Pin 6 of chip U1 outputs the processed signal to pin 2 of chip U2B. Pin 3 of chip U2B is connected in series with resistor R12 to ground. Pin 1 of output terminal of chip U2B is connected in series with resistor R14 to pin 5 of signal terminal. Pin 2 of chip U2B is connected in series with resistor R13 to pin 1 of output terminal. The signal terminal is electrically connected to the processor via a data line.

[0006] As a preferred technical solution of the present invention, the power supply circuit includes a first power supply circuit and a second power supply circuit, and the output terminals of the first power supply circuit and the second power supply circuit provide a ±15V DC voltage source for chip U1.

[0007] In a preferred embodiment of the present invention, the first power supply circuit includes a Zener diode Q1. The input terminal of the Zener diode Q1 is connected to a voltage source -VCC, and the output terminal of the Zener diode Q1 outputs a -15V voltage source. The GND terminal of the Zener diode Q1 is grounded. The input terminal of the Zener diode Q1 is also connected to a grounding capacitor C6 and an electrolytic capacitor E1. The output terminal of the Zener diode Q1 is also connected in sequence to a grounding capacitor C8, an electrolytic capacitor E2, a grounding capacitor C5, and a grounding capacitor C2. The output terminal of the Zener diode Q1 is also connected in series with a resistor R16 and a light-emitting diode D1 to ground. The input terminal of the Zener diode Q1 is also connected in series with a diode D3 to the output terminal. The anode of the diode D3 is connected to the input terminal of the Zener diode Q1, and the cathode of the diode D3 is connected to the output terminal of the Zener diode Q1.

[0008] In a preferred embodiment of the present invention, the second power supply circuit includes a Zener diode Q2. The input terminal of the Zener diode Q2 is connected to a voltage source VCC, and the output terminal of the Zener diode Q2 outputs a +15V voltage source. The GND terminal of the Zener diode Q2 is grounded. The input terminal of the Zener diode Q2 is also connected to a grounding capacitor C7 and an electrolytic capacitor E3. The output terminal of the Zener diode Q2 is also connected in sequence to a grounding capacitor C9, an electrolytic capacitor E4, a grounding capacitor C4, and a grounding capacitor C3. The output terminal of the Zener diode Q2 is also connected in series with a resistor R17 and a light-emitting diode D2 to ground. The output terminal of the Zener diode Q2 is also connected in series with a diode D4 to the input terminal. The anode of the diode D4 is connected to the output terminal of the Zener diode Q2, and the cathode of the diode D4 is connected to the input terminal of the Zener diode Q2.

[0009] As a preferred technical solution of the present invention, pin 3 of chip U1 is connected in series with resistors R7 and R8 to ground, pin 2 of chip U1 is connected in series with resistors R5 and R6 to ground, a capacitor C1 is connected in series between pin 3 and pin 2 of chip U1, and a resistor R11 is connected in series between pin 6 of chip U1 and pin 2 of chip U2B.

[0010] As a preferred embodiment of the present invention, pin 7 of chip U1 is connected to a +15V voltage source, and pin 4 of chip U1 is connected to a -15V voltage source.

[0011] As a preferred embodiment of the present invention, pin 1 of the signal terminal is connected to the voltage source VCC, pin 2 of the signal terminal is grounded, pin 3 of the signal terminal is connected to the voltage source -VCC, and pin 6 of the signal terminal is connected to ground via a series resistor R15.

[0012] This utility model has the following beneficial effects: This invention uses a sampling and detection unit to sample the impedance signal of the main circuit of the equipment in real time. After processing by the signal processing circuit, a pulse signal is output to the processor. The processor compares the received pulse signal with preset parameters and controls the operation of the actuator based on the comparison result. This ensures the operation of large-tonnage intermediate frequency equipment in China during startup and eliminates the startup difficulties caused by poor impedance matching of intermediate frequency equipment.

[0013] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a system schematic diagram of an automatic auxiliary start-up system for medium-frequency equipment; Figure 2 This is the circuit diagram for the first power supply circuit; Figure 3 This is the circuit diagram for the second power supply circuit; Figure 4 This is a circuit diagram of a signal processing circuit. Detailed Implementation

[0016] Because the impedance matching degree of the main circuit resonant capacitor and the induction coil changes with the load during the startup process of large-tonnage intermediate frequency equipment, customers often encounter situations where the intermediate frequency equipment fails to start even when there are no faults, seriously affecting normal factory production. In order to solve this technical problem, this application proposes an automatic auxiliary startup system for intermediate frequency equipment. The system uses inverter voltage to detect changes in load impedance, and compares the detected main circuit resonant waveform with the set parameters. The microcontroller program adjusts and calculates a suitable startup trigger pulse, thereby ensuring that the startup of the equipment is not affected by changes in the main circuit impedance, and ensuring the normal production of large-tonnage intermediate frequency equipment.

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0018] Example 1: Please see Figure 1-4 As shown, this utility model is an automatic auxiliary start-up system for medium-frequency equipment, including a sampling and detection unit and a power supply unit. The sampling and detection unit collects the load impedance signal, processes the signal, and transmits it to a pulse signal processor. After receiving the pulse signal, the processor compares it with the reserved signal data and controls the actuator to run according to the comparison result. The power supply unit includes two parallel switching power supplies, which are used to power the sampling and detection unit, the processor, and the actuator. The actuator adopts a vacuum contactor to control the switching on and off of the main circuit.

[0019] The sampling and detection unit includes a power supply circuit and a signal processing circuit. The power supply circuit is used to provide a ±15V DC voltage source for the signal processing power supply. The power supply circuit includes a first power supply circuit and a second power supply circuit. The output terminals of the first power supply circuit and the second power supply circuit provide a ±15V DC voltage source for the chip U1. The signal processing circuit includes chip U1. Pin 7 of chip U1 is connected to a +15V voltage source, and pin 4 of chip U1 is connected to a -15V voltage source. Pin 1 of chip U1 is connected in series with resistors R10 and R9 to pin 8 of chip U1. Pin 3 of chip U1 is connected in series with resistor R4 to pin 1 of transformer T2. Pin 2 of transformer T2 is connected to the main circuit load. Pin 2 of chip U1 is connected in series with resistor R3 to pin 1 of transformer T1. Pin 2 of transformer T1 is also connected to the main circuit load. Pin 3 of chip U1 is also connected in series with resistors R7 and R8 to ground. Pin 2 of chip U1 is also connected in series with resistors R5 and R6 to ground. A capacitor C1 is also connected in series between pins 3 and 2 of chip U1. Pin 6 of chip U1 is connected in series with resistor R11 to pin 2 of chip U2B. Pin 6 of chip U1 outputs the processed signal to pin 2 of chip U2B. Pin 3 of chip U2B is connected to ground via series resistor R12. Pin 1 of chip U2B is connected to pin 5 of the signal terminal via series resistor R14. Pin 2 of chip U2B is connected to pin 1 of the output terminal via series resistor R13. The signal terminal is electrically connected to the processor via the data line. Pin 1 of the signal terminal is connected to the voltage source VCC. Pin 2 of the signal terminal is grounded. Pin 3 of the signal terminal is connected to the voltage source -VCC. Pin 6 of the signal terminal is connected to ground via series resistor R15.

[0020] Understandably, in practical engineering applications, a system voltage of ±15V is required for the operation of the circuitry within the sampling and detection unit. Specifically, for example... Figure 3-4As shown, the first power supply circuit includes a Zener diode Q1. The input terminal of Zener diode Q1 is connected to a voltage source -VCC, and the output terminal of Zener diode Q1 outputs a -15V voltage source. The GND terminal of Zener diode Q1 is grounded. The input terminal of Zener diode Q1 is also connected to a grounding capacitor C6 and an electrolytic capacitor E1. The output terminal of Zener diode Q1 is also connected in sequence to a grounding capacitor C8, an electrolytic capacitor E2, a grounding capacitor C5, and a grounding capacitor C2. The output terminal of Zener diode Q1 is also connected in series with a resistor R16 and a light-emitting diode D1 to ground. The input terminal of Zener diode Q1 is also connected in series with a diode D3 to the output terminal. The anode of diode D3 is connected to the input terminal of Zener diode Q1, and the cathode of diode D3 is connected to the output terminal of Zener diode Q1. The second power supply circuit includes a Zener diode Q2. The input terminal of Zener diode Q2 is connected to the voltage source VCC, and the output terminal of Zener diode Q2 outputs a +15V voltage source. The GND terminal of Zener diode Q2 is grounded. The input terminal of Zener diode Q2 is also connected to a grounding capacitor C7 and an electrolytic capacitor E3. The output terminal of Zener diode Q2 is also connected in sequence to a grounding capacitor C9, an electrolytic capacitor E4, a grounding capacitor C4, and a grounding capacitor C3. The output terminal of Zener diode Q2 is also connected in series with a resistor R17 and a light-emitting diode D2 to ground. The output terminal of Zener diode Q2 is also connected in series with a diode D4 to the input terminal. The anode of diode D4 is connected to the output terminal of Zener diode Q2, and the cathode of diode D4 is connected to the input terminal of Zener diode Q2.

[0021] The workflow of an automatic assisted start-up system for intermediate frequency equipment in this embodiment is as follows: This application uses a sampling and detection unit to sample the impedance signal of the main circuit of the equipment in real time. After processing by a signal processing circuit, a pulse signal is output to the processor. The processor compares the received pulse signal with preset parameters and controls the operation of the actuator based on the comparison result. The actuator controls the on / off state of the main circuit. When the pulse signal matches the preset parameters, the processor controls the main circuit to conduct through the actuator, thus ensuring the operation of large-tonnage intermediate frequency equipment during startup and eliminating the startup difficulties caused by poor impedance matching in intermediate frequency equipment. The power supply status of the circuit on the sampling and detection unit is displayed by setting LEDs D1 and D2. When the power is turned on, LEDs D1 and D2 are turned on and lit up.

[0022] This embodiment illustrates the working principle of an automatic auxiliary start-up system for intermediate frequency (IF) equipment proposed in this application. The processor uses a microcontroller and a sampling detection unit to sample the impedance matching parameters of the main circuit of the equipment in real time. The processor analyzes the required start-up voltage and angle. At the moment of equipment startup, the main circuit is pre-charged. By detecting the resonant waveform of the main circuit and comparing it with the set parameters, the microcontroller program adjusts and calculates a suitable start-up trigger pulse. The system then begins frequency sweep startup. With the assistance of the automatic auxiliary start-up system, the IF equipment can start 100% even when the impedance matching of the main circuit is very low. This ensures that the startup of the equipment is not affected by changes in the main circuit impedance, guaranteeing the normal production of the IF equipment.

[0023] Based on its characteristics, we understand that the automatic auxiliary start-up system for this intermediate frequency equipment requires the initial development of an algorithm program and appropriate trigger pulse signals using a high-performance microcontroller. The algorithm program blocks have evolved from single sampling to multi-point sampling combined signals, and the pulse signals have evolved from a 20µs single narrow pulse signal to a 70µs double wide pulse signal. These were all achieved through continuous on-site exploration and adjustments to meet the customer's production requirement of a 100% start-up success rate for the intermediate frequency equipment.

[0024] It is worth noting that in the above system embodiments, the various units are divided according to functional logic, but are not limited to the above division, as long as the corresponding functions can be achieved; in addition, the specific names of each functional unit are only for easy differentiation and are not used to limit the protection scope of this utility model.

[0025] Furthermore, those skilled in the art will understand that all or part of the steps in the methods of the above embodiments can be implemented by a program instructing related hardware, and the corresponding program can be stored in a computer-readable storage medium, such as ROM / RAM, disk, or optical disk.

[0026] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. An automatic auxiliary start-up system for medium-frequency equipment, characterized in that, include The sampling and detection unit collects the load impedance signal, processes the signal, and transmits it to the processor via a pulse signal. The processor receives the pulse signal, compares it with the reserved signal data, and controls the actuator to run based on the comparison result. The power supply unit includes two parallel switching power supplies used to power the sampling and detection unit, the processor, and the actuator. The sampling and detection unit includes a power supply circuit and a signal processing circuit. The power supply circuit is used to provide a ±15V DC voltage source for the signal processing power supply. The signal processing circuit includes a chip U1. Pin 1 of the chip U1 is connected in series with resistors R10 and R9 to pin 8 of the chip U1. Pin 3 of the chip U1 is connected in series with resistor R4 to pin 1 of the transformer T2. Pin 2 of the transformer T2 is connected to the main circuit load. Pin 2 of the chip U1 is connected in series with resistor R3 to pin 1 of the transformer T1. Pin 2 of the transformer T1 is connected to the main circuit load. The processed signal is output from pin 6 of chip U1 to pin 2 of chip U2B. Pin 3 of chip U2B is connected to ground via series resistor R12. Pin 1 of chip U2B is connected to pin 5 of signal terminal via series resistor R14. Pin 2 of chip U2B is connected to pin 1 of output terminal via series resistor R13. The signal terminal is electrically connected to the processor via a data line.

2. The automatic auxiliary start-up system for medium-frequency equipment according to claim 1, characterized in that, The power supply circuit includes a first power supply circuit and a second power supply circuit, and the output terminals of the first power supply circuit and the second power supply circuit provide a ±15V DC voltage source for chip U1.

3. The automatic auxiliary start-up system for medium-frequency equipment according to claim 2, characterized in that, The first power supply circuit includes a Zener diode Q1, the input terminal of which is connected to a voltage source -VCC, the output terminal of which outputs a -15V voltage source, and the GND terminal of which is grounded. The input terminal of the Zener diode Q1 is also connected to a grounding capacitor C6 and an electrolytic capacitor E1. The output terminal of the Zener diode Q1 is also connected in sequence to a grounding capacitor C8, an electrolytic capacitor E2, a grounding capacitor C5, and a grounding capacitor C2. The output terminal of the Zener diode Q1 is also connected in series with a resistor R16 and a light-emitting diode D1 to ground. A diode D3 is connected in series from the input terminal of the Zener diode Q1 to the output terminal. The positive terminal of the diode D3 is connected to the input terminal of the Zener diode Q1, and the negative terminal of the diode D3 is connected to the output terminal of the Zener diode Q1.

4. The automatic auxiliary start-up system for medium-frequency equipment according to claim 2, characterized in that, The second power supply circuit includes a Zener diode Q2, the input terminal of which is connected to a voltage source VCC, the output terminal of which outputs a +15V voltage source, and the GND terminal of which is grounded. The input terminal of the Zener diode Q2 is also connected to a grounding capacitor C7 and an electrolytic capacitor E3; The output terminal of the Zener diode Q2 is also connected in sequence to a grounding capacitor C9, an electrolytic capacitor E4, a grounding capacitor C4, and a grounding capacitor C3. The output terminal of the Zener diode Q2 is also connected in series with a resistor R17 and a light-emitting diode D2 to ground. A diode D4 is connected in series from the output terminal of the Zener diode Q2 to the input terminal. The positive terminal of the diode D4 is connected to the output terminal of the Zener diode Q2, and the negative terminal of the diode D4 is connected to the input terminal of the Zener diode Q2.

5. The automatic auxiliary start-up system for medium-frequency equipment according to claim 1, characterized in that, Pin 3 of chip U1 is connected in series with resistors R7 and R8 to ground. Pin 2 of chip U1 is connected in series with resistors R5 and R6 to ground. A capacitor C1 is connected in series between pin 3 and pin 2 of chip U1. Pin 6 of chip U1 is connected in series with resistor R11 to pin 2 of chip U2B.

6. The automatic auxiliary start-up system for medium-frequency equipment according to claim 2, characterized in that, Pin 7 of chip U1 is connected to a +15V voltage source, and pin 4 of chip U1 is connected to a -15V voltage source.

7. The automatic auxiliary start-up system for medium-frequency equipment according to claim 1, characterized in that, Pin 1 of the signal terminal is connected to the voltage source VCC, pin 2 of the signal terminal is grounded, pin 3 of the signal terminal is connected to the voltage source -VCC, and pin 6 of the signal terminal is connected to ground via a series resistor R15.

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