Oil and gas ignition device based on cathode short-circuit gate-controlled thyristor

Abstract

The application belongs to the technical field of semiconductor, and particularly relates to an oil-gas ignition device based on a cathode short-circuit grid-controlled thyristor. The oil-gas ignition device comprises a boost circuit, a discharge circuit, a direct current bias circuit and a feedback control circuit. The boost circuit is mainly used for voltage conversion from low voltage to high voltage by a transformer. The discharge circuit mainly comprises a high-voltage capacitor, a CS-MCT device and a resistor. The boost circuit is supplied with power by an external direct current power supply V1, and outputs high voltage to the high-voltage capacitor in the discharge circuit and the feedback control circuit through the transformer. Meanwhile, the boost circuit outputs a direct current voltage signal to the direct current bias circuit. The direct current bias circuit outputs voltage signals to the discharge circuit and the feedback control circuit, respectively. The feedback control circuit outputs voltage signals to the boost circuit and the discharge circuit, respectively. The oil-gas ignition device based on the CS-MCT has the advantages of compact circuit structure, fast response speed, high working frequency, long working life and small size.

Description

Technical Field

[0001] This invention belongs to the field of semiconductor technology, specifically relating to an oil and gas ignition device based on a cathode-short MOS-Controlled Thyristor (CS-MCT). Background Technology

[0002] With the development of aviation technology and the increasing complexity and variability of application environments, higher demands are being placed on the ignition systems of aero-engines. Capacitor-based pulse circuits, by compressing energy over a time scale, can achieve instantaneous high-energy pulse output and generate an electric arc via a discharge cable, providing an effective solution for fuel-air ignition in aero-engines. A typical pulse circuit mainly consists of energy compression and energy output sections, connected by a power switch. As the hub of energy conversion, the power switch plays a crucial role in determining the pulse output. Currently, commonly used engine ignition systems are primarily vacuum tube-based capacitor-based ignition systems. The core component, the vacuum tube, utilizes vacuum as the insulating medium between the main electrodes and employs a specially designed trigger electrode to control the switch operation. Vacuum tubes offer advantages such as high charge carrying capacity, wide operating voltage range, and rapid dielectric recovery, meeting conventional requirements. However, with increasingly fierce competition in the international aerospace field, problems such as electrode erosion, short switch life, and low power frequency severely limit the development of aero-engines. Summary of the Invention

[0003] The present invention addresses the aforementioned problems by proposing an oil-gas ignition device based on a cathode short-circuit gate controlled thyristor (CS-MCT). Due to the cathode short-circuit thyristor structure within the CS-MCT, it possesses high di / dt capability. This invention utilizes silicon-based power devices—characterized by simple driving, low power consumption, high pulse output, and high reliability—combined with a flyback transformer for low-voltage to high-voltage voltage conversion, resulting in an oil-gas ignition device with fast response, high operating frequency, long service life, and small size.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] This invention provides an oil-gas ignition device based on a cathode short-circuit gate-controlled thyristor. The oil-gas ignition device includes a boost circuit, a discharge circuit, a DC bias circuit, and a feedback control circuit. The boost circuit mainly uses a transformer to achieve voltage transformation from low to high voltage. The discharge circuit mainly consists of a high-voltage capacitor, a CS-MCT device, and a resistor. The boost circuit is powered by an external DC power supply, and the high voltage output from the transformer is supplied to the high-voltage capacitor in the discharge circuit and the feedback control circuit. Simultaneously, the boost circuit outputs a DC voltage signal to the DC bias circuit, which in turn outputs voltage signals to the discharge circuit and the feedback control circuit. The feedback control circuit then outputs voltage signals to both the boost circuit and the discharge circuit.

[0006] The boost circuit is powered by an external DC power supply. It utilizes a flyback transformer combined with the switching of an N-type MOSFET to achieve a low-voltage to high-voltage transition. The high-voltage output of the flyback transformer is input to the discharge circuit via a rectifier diode to charge the high-voltage capacitor in the discharge circuit. Simultaneously, a Zener diode at the input of the boost circuit provides a fixed potential to power the DC bias circuit and the gate drive of the N-type MOSFET in the boost circuit. The output of the DC bias circuit first powers the gate drive of the CS-MCT in the discharge circuit, and then powers the comparator in the feedback circuit through a resistor divider. A preset voltage signal is also provided to the comparator using a resistor divider. In the boost circuit, the high-voltage output uses a resistor divider to provide a comparison voltage signal to the comparator in the feedback control circuit. When the comparison voltage signal is lower than the preset voltage signal, it indicates that the output voltage in the boost circuit is lower than the operating voltage of the discharge circuit. The comparator outputs a high-level signal, which generates a square wave signal through the pulse generation circuit in the feedback control circuit and controls the N-type MOSFET switch in the boost circuit, causing the flyback transformer to work and thus stabilizing the boost circuit output. When the comparison voltage signal is higher than the preset voltage signal, it indicates that the high-voltage capacitor in the discharge circuit has been charged to the operating voltage. The comparator in the feedback control circuit then outputs a voltage signal to drive the gate of the CS-MCT in the discharge circuit. The CS-MCT turns on, causing the discharge circuit composed of the high-voltage capacitor, the CS-MCT device, and the resistor to discharge. At the same time, a high-pulse output is generated across the resistor in the discharge circuit. An electric arc is generated by the external discharge cable, which can be used for oil and gas ignition.

[0007] Furthermore, the circuit structure adopted in this invention is compact. It mainly uses a flyback transformer for voltage boosting to charge the high-voltage capacitor to the working voltage. The entire circuit only requires a DC voltage signal to realize the operation of the charging circuit, discharging circuit, DC bias circuit and feedback control circuit. No additional high-voltage charging power supply or signal source is required, which simplifies the complexity of the oil and gas ignition device and greatly reduces the cost and size of the ignition device.

[0008] Furthermore, this invention uses a high-voltage capacitor, a CS-MCT device, and a resistor as a discharge circuit. The CS-MCT device, as a solid-state semiconductor switch, has extremely high di / dt capability and extremely low on-state voltage drop. After the device is turned on, the high-voltage capacitor will discharge through the discharge circuit in a damped oscillation manner, generating extremely high pulse output, which can greatly optimize the energy output, operating frequency, service life, and oil-gas ignition efficiency of the ignition device.

[0009] The beneficial effects of the present invention are that the control method of the oil and gas ignition device of the present invention is simple, and compared with the oil and gas ignition device based on vacuum tube, the oil and gas ignition device of the present invention is based on cathode short-circuit thyristors, which has a more compact circuit structure, faster response speed, higher operating frequency, longer service life and smaller size. Attached Figure Description

[0010] Figure 1 This is an overall structural diagram of an oil-gas ignition device based on CS-MCT in this invention;

[0011] Figure 2 This is an overall circuit topology diagram of an oil-gas ignition device based on CS-MCT in this invention;

[0012] Figure 3 This is a schematic diagram of the CS-MCT structure in this invention. Detailed Implementation

[0013] The technical solution of the present invention will now be described in detail with reference to the accompanying drawings:

[0014] like Figure 1 The diagram shows the overall structure of a CS-MCT-based oil-gas ignition device according to the present invention. The device includes a boost circuit, a discharge circuit, a DC bias circuit, and a feedback control circuit. The boost circuit mainly uses a transformer to convert low voltage to high voltage. The discharge circuit's discharge loop mainly consists of a high-voltage capacitor, a CS-MCT device, and a resistor. The boost circuit is powered by an external DC power supply V1. The transformer outputs high voltage to the high-voltage capacitor in the discharge circuit and the feedback control circuit. Simultaneously, the boost circuit outputs a DC voltage signal to the DC bias circuit. The DC bias circuit outputs voltage signals to the discharge circuit and the feedback control circuit, and the feedback control circuit outputs voltage signals to both the boost circuit and the discharge circuit.

[0015] like Figure 2The diagram shows the overall circuit topology of a CS-MCT-based oil and gas ignition device according to the present invention. The basic working principle of this circuit is as follows: An external DC power supply provides 28V DC to the system through port Pin1. After passing through resistor R8, the input voltage is stabilized to 12V at port Pin2 by Zener diode Z1. During the conduction of the primary winding L1 of the flyback transformer T1, the output voltage of the secondary winding L2 is negative at the top and positive at the bottom, rectifier diode D1 is cut off, and the secondary current is 0. When the primary winding L1 is cut off, the output voltage of the secondary winding L2 is positive at the top and negative at the bottom, rectifier diode D1 conducts, realizing the 28V to 1700V boost conversion and charging the high-voltage capacitor C1. The conduction and cutoff of the primary winding of the flyback transformer T1 are mainly achieved by the driver 2 controlling the N-type MOSFET Q1, and port Pin4 is connected to port Pin2 to provide a 12V operating voltage to the VDD port of the driver 2. The DC bias circuit input port Pin5 is connected to port Pin2. On one hand, it directly provides a 12V operating voltage to the VDD port of the CS-MCT gate driver Driver1. On the other hand, it provides a 5V operating voltage to the V+ port of comparator COMP1 through resistor R3, and simultaneously provides a reference voltage signal Vref to the INA+ port of comparator COMP1 through resistors R4 / R5. In addition, the output of rectifier diode D1 generates a comparison voltage signal Vcomp through resistors R1 and R2, and provides it to the INB+ terminal of comparator COMP1. If the comparison voltage Vcomp is lower than the reference voltage Vref, it indicates that the output voltage of the boost circuit is lower than the operating voltage of the discharge circuit. The output OUTA terminal of comparator COMP1 outputs a high level, and after passing through the pulse signal generation circuit, it outputs a square wave voltage signal to the signal input terminal IN+ of driver Driver2, controlling the N-type MOSFET Q1 to turn on and off, so that the flyback transformer T1 continues to work to boost the voltage and charge the high-voltage capacitor C1. The pulse signal generation circuit consists of diode D3, resistor R6, diode D4, resistor R7, and capacitor C2. The high-level width of the pulse signal is determined by the time constants of resistor R6 and capacitor C2, and the time interval between pulse signals can be changed by resistor R7. If the comparison voltage Vcomp is higher than the reference voltage Vref, it indicates that the discharge circuit is in operating voltage condition. The output OUTB terminal of comparator COMP1 then outputs a high level to provide a high-level signal to the signal input terminal IN+ of driver1. At the same time, the output OUTB terminal of comparator COMP1 is connected to the signal input terminal IN- of driver1, ensuring that driver1 and driver2 do not receive signal input at the same time, that is, the boost circuit and the discharge circuit do not work simultaneously.When Driver1 receives a high-level signal, it begins to operate. The gate voltage of the CS-MCT device is higher than the device threshold voltage, and the device turns on. Thanks to the low on-resistance of the CS-MCT device, the high-voltage capacitor C1 discharges underdamped oscillatingly through the circuit of high-voltage capacitor C1, CS-MCT device, and resistor R9. At the same time, the freewheeling diode D2 ensures the safety of the CS-MCT device when the current flows in reverse. During the discharge process, high-energy pulse outputs are generated at ports DH1 and DH2 across resistor R9, and the external discharge cable can realize oil and gas ignition. After the voltage of capacitor C1 decreases during the discharge process, the above process is repeated until the system power supply at port Pin1 is disconnected. In addition, port Pin3 is connected to ground GND2, port Pin6 is connected to ground GND3, one end of the N-type MOSFET Q1 is connected to ground GND1, one end of resistor R2 is connected to GND4, the low-voltage signal input port IN- of Driver1 is connected to ground GND3, and the V- port of comparator COMP1 is connected to ground GND2. Meanwhile, ground GND1 is isolated from ground GND2 through capacitor C3 and 0-ohm resistor R10, ground GND3 is isolated from ground GND2 through 0-ohm resistor R12, and ground GND4 is isolated from ground GND2 through 0-ohm resistor R11.

[0016] During device operation, the high withstand voltage of the CS-MCT device allows the discharge circuit to remain blocked when the device is not turned on. Simultaneously, due to its low on-resistance, the CS-MCT device can generate high-energy pulse output in the discharge circuit after being turned on. Figure 3 This is a schematic diagram of the CS-MCT structure. The CS-MCT device is a composite structure integrating an N-type MOSFET and a thyristor. Due to the presence of the cathode short-circuit region, the CS-MCT device can maintain high-voltage blocking characteristics when the gate voltage is 0. Because the CS-MCT device has voltage-controlled characteristics with an insulated gate, it has a simpler drive circuit compared to current-controlled devices. Simultaneously, the CS-MCT has an internal parasitic thyristor structure, which is triggered to turn on when the CS-MCT is turned on, generating a high di / dt current output. Furthermore, thanks to the conductance modulation effect, the CS-MCT device has very low on-resistance, thus exhibiting low conduction losses.

Claims

1. An oil-gas ignition device based on a cathode short-circuit gate-controlled thyristor, characterized in that, The circuit includes a boost circuit, a discharge circuit, a DC bias circuit, and a feedback control circuit. The boost circuit is powered by an external DC power supply and uses a flyback transformer combined with the switching of an N-type MOSFET to achieve a low-voltage to high-voltage boost transition. The high-voltage output of the flyback transformer is input to the discharge circuit through a rectifier diode to charge the high-voltage capacitor in the discharge circuit. Simultaneously, a Zener diode at the input of the boost circuit is used to fix the potential and power the DC bias circuit and the gate drive of the N-type MOSFET in the boost circuit. The output of the DC bias circuit powers the gate drive of the CS-MCT in the discharge circuit. The DC bias circuit also powers the comparator in the feedback control circuit through a resistor divider and provides a preset voltage signal to the comparator using a resistor divider. The high-voltage output of the boost circuit uses a resistor divider to power the comparator in the feedback control circuit. The comparator provides a voltage signal to be compared. When the voltage signal to be compared is lower than the preset voltage signal, it indicates that the output voltage in the boost circuit is lower than the operating voltage of the discharge circuit. The comparator outputs a high-level signal, which generates a square wave signal through the pulse generation circuit in the feedback control circuit and controls the switch of the N-type MOSFET in the boost circuit, so that the flyback transformer works and stabilizes the output of the boost circuit. When the voltage signal to be compared is higher than the preset voltage signal, it indicates that the high-voltage capacitor in the discharge circuit has been charged to the operating voltage. The comparator in the feedback control circuit then outputs a voltage signal to drive the gate of the CS-MCT in the discharge circuit. The CS-MCT turns on, causing the discharge circuit composed of the high-voltage capacitor, the CS-MCT device and the resistor to discharge. At the same time, a high pulse output is generated across the resistor in the discharge circuit, and an electric arc is generated by the external discharge cable for oil and gas ignition.

2. The oil-gas ignition device based on a cathode short-circuit gate-controlled thyristor according to claim 1, characterized in that, The CS-MCT device is a composite structure integrating an N-type MOSFET and a thyristor. Due to the presence of the cathode short-circuit region, the CS-MCT device maintains high-voltage blocking characteristics when the gate voltage is 0. At the same time, the presence of the thyristor structure after turn-on causes the device to generate high di / dt, and the on-resistance of the device is extremely low under the action of conductance modulation.

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