Direct-current high-pressure hydrogen furnace igniter

Abstract

The utility model discloses a direct-current high-voltage hydrogen furnace igniter, which is characterized in that a controller of the igniter outputs and controls the on-off state of a power field-effect tube Q1 through an external resistor-capacitor PWM (pulse width modulation) signal and a frequency signal, and generates a pulse signal controlled by a duty ratio according to an input reference voltage VREF and a feedback voltage VFB; a pulse signal is coupled to the grid electrode of the power field effect transistor Q1 through a resistor-capacitor connected in parallel. When the power field effect transistor Q1 is switched on, the current passes through the primary coil of the transformer T1. In the conduction period, high-frequency current generated by the power field effect transistor Q1 is transmitted to the secondary coil through the mutual inductance effect of the transformer T1. And the input voltage of the secondary coil of the transformer T1 is boosted to about 20000V high voltage. A high-voltage rectifying silicon column is arranged in the transformer T1, so that 20000v direct-current voltage is output, and the voltage is ignition voltage. According to the utility model, the operation risk can be reduced, the ignition safety of the hydrogen furnace is improved, and the interference to control equipment and surrounding electronic equipment is reduced.

Description

Technical Field

[0001] The utility model relates to the field of hydrogen fuel equipment, in particular to a DC high-voltage hydrogen furnace igniter. Background Art

[0002] Related technologies indicate that a hydrogen furnace is a device that uses hydrogen as fuel. As a clean and efficient heating device, hydrogen can release a large amount of heat energy during combustion for providing heat energy, and thus has been widely used. Generally, to ignite a hydrogen furnace, it is necessary to first ignite a pilot burner ignition gun (automatically shut off after 15 seconds of ignition), and then immediately open the liquefied gas valve 2 to ignite the pilot burner. After successful ignition, the combustion indicator light is lit. After the pilot burner burns stably, open the hydrogen valve 3 with an opening degree of ≤ 30% to ignite the hydrogen burner. After the hydrogen burner burns stably, gradually increase the opening degree of the hydrogen valve 3. If the hydrogen source meets the standard and the hydrogen burns stably, the liquefied gas valve 2 can be closed to reduce energy consumption. Refer to Figure 1 shown. However, in existing ignition systems, usually, a high-voltage generator in the control console boosts the 220V or 380V AC voltage to about 10,000V AC high-voltage electricity, and then uses a high-voltage-resistant cable to send the AC high-voltage electricity to the pilot burner ignition gun for ignition. The ignition gun arcs under high voltage to ignite the liquefied gas. Usually, the high-voltage generator is in the control box, and the high-voltage cable from the control box to the hydrogen furnace burner 1 is about 10 meters long. Refer to Figure 1 shown. There is a risk of electric shock near the high-voltage cable. In addition, the AC high-voltage radiation will also interfere with surrounding electronic devices, causing unstable operation of the surrounding electronic devices. Summary of the Invention

[0003] The utility model aims to at least solve one of the technical problems existing in the prior art. For this reason, the utility model provides a DC high-voltage hydrogen furnace igniter, which can reduce the operation risk, improve the safety of hydrogen furnace ignition, and reduce the interference to control equipment and surrounding electronic devices.

[0004] According to a DC high-voltage hydrogen furnace igniter of the utility model, it includes a 12V DC power supply unit and a high-voltage generator unit. The power output end of the 12V DC power supply unit is connected to the high-voltage generator unit through a terminal block P1. The high-voltage generator unit includes a controller U1. The VFB terminal of the controller U1 is connected to the 1st pin of the terminal block PI through a resistor R3 and to GND through a capacitor C8. The 2nd pin of the terminal block P1 is GND. The 3rd pin of the terminal block P1 is respectively connected to the VCC terminal of the controller U1 and one end of the input port of a transformer T1 through a diode D1 and a fuse F1 in sequence. The diode D1 is connected in parallel with a diode D2.

[0005] The ISENSE terminal of the controller U1 is connected to the source electrode of the power field effect transistor Q1. The drain electrode of the power field effect transistor is connected to the other end of the input port of the transformer T1. The source electrode of the power field effect transistor Q1 is connected to GND through the resistor R9. The RT / CT of the controller U1 is connected to GND through the capacitor C4 and connected to the VREF terminal of the controller U1 through the resistor R7. The VREF of the controller U1 is connected to GND through the capacitor C6. The VCC terminal of the controller U1 is connected to one end of the input port of the transformer T1 through the resistor R2 and connected to GND through the capacitor C5. The capacitor C5 is connected in parallel with the electrolytic capacitor C3. The electrolytic capacitor C1 is connected to the circuit between the resistor R9 and the electrolytic capacitor C3. The OUT terminal of the controller U1 is connected to the gate of the power field effect transistor Q1 through the capacitor C17 and connected to GND through the resistor R5. The capacitor C17 is connected in parallel with the resistor R11.

[0006] It further includes the capacitor C2, the electrolytic capacitor C9, the resistor R4, the resistor R6, the capacitor C7, the resistor R8, the resistor R10 and the resistor R12. One end of the capacitor C2 is connected to the circuit between the fuse F1 and the transformer T1, and the other end is grounded. One end of the electrolytic capacitor C9 is connected to the circuit between the fuse F1 and the resistor R2, and the other end is connected to GND. One end of the resistor R4 is connected to one end of the input port of the transformer T1, and the other end is grounded through the light-emitting diode LED1. The resistor R6 is connected in parallel with the resistor R4. The resistor R10 is connected in parallel across the two ends of the input port of the transformer T1. The diode D3 is connected to the circuit between the resistor R10 and the other end of the input port of the transformer T1. The resistor R12 and the capacitor C7 are connected in parallel and then connected in parallel with the resistor R10. The resistor R8 is connected in parallel with the capacitor C8. The output port of the transformer T1 outputs a DC high voltage through the diode D.

[0007] Compared with the prior art, the present utility model has the following beneficial effects:

[0008] 1) The present utility model changes the conventional 20000V AC ignition method to a 12V DC inversion conversion to 20000V DC voltage. Since the volume after improvement becomes smaller, it can be installed near the ignition element, shortening the high-voltage path, effectively reducing the radiation interference and the electric shock risk during the ignition process.

[0009] 2) The structure of the present utility model is simple, easy to implement, and has a low cost.

[0010] The additional aspects and advantages of the present utility model will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present utility model. Description of the Drawings

[0011] Figure 1It is a schematic diagram of the ignition principle near the burner of the existing hydrogen furnace;

[0012] Figure 2 It is a schematic circuit diagram of the high-voltage generator unit of the DC high-voltage hydrogen furnace igniter according to an embodiment of the present invention.

[0013] Reference numerals:

[0014] 1: Hydrogen furnace burner; 2: Liquefied gas valve; 3: Hydrogen valve. Detailed implementation manners

[0015] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention, but should not be construed as limiting the present invention.

[0016] The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numerals and / or letters in different examples. This repetition is for the purpose of simplification and clarity and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but those of ordinary skill in the art may be aware of the applicability of other processes and / or the use of other materials.

[0017] The following refers to Figure 2 Describe a DC high-voltage hydrogen furnace igniter according to an embodiment of the present invention, including a 12V DC power supply unit and a high-voltage generator unit. In this embodiment, the 12V DC power supply unit is a 12V storage battery or a rectified power supply of a transformer. The power output terminal of the 12V DC power supply unit is connected to the high-voltage generator unit through a terminal block P1.

[0018] The high-voltage generator unit includes a controller U1. The VFB terminal of the controller U1 is connected to the 1-pin of the wiring terminal PI through a resistor R3 and to GND through a capacitor C8. The 2-pin of the wiring terminal P1 is GND, and the 3-pin of the wiring terminal P1 is sequentially connected to the VCC terminal of the controller U1 and one end of the input port of the transformer T1 through a diode D1 and a fuse F1 respectively. A diode D2 is connected in parallel with the diode D1. In this embodiment, the protection diodes D1 and D2 are reversely connected between the 3-pin of the wiring terminal P1 and the fuse, which is used to prevent the harm of high voltage to the electronic components in the power supply circuit and can prevent the circuit from being burned out due to reverse connection of the power supply. The ISENSE terminal of the controller U1 is connected to the source electrode of the power field effect transistor Q1. The drain electrode of the power field effect transistor is connected to the other end of the input port of the transformer T1. The source electrode of the power field effect transistor Q1 is connected to GND through a resistor R9. The RT / CT of the controller U1 is connected to GND through a capacitor C4 and to the VREF terminal of the controller U1 through a resistor R7. The VREF of the controller U1 is connected to GND through a capacitor C6. The VCC terminal of the controller U1 is connected to one end of the input port of the transformer T1 through a resistor R2 and to GND through a capacitor C5. An electrolytic capacitor C3 is connected in parallel with the capacitor C5. An electrolytic capacitor C1 is connected to the circuit between the resistor R9 and the electrolytic capacitor C3. The OUT terminal of the controller U1 is connected to the gate electrode of the power field effect transistor Q1 through a capacitor C17 and to GND through a resistor R5. A resistor R11 is connected in parallel with the capacitor C17.

[0019] It also includes a capacitor C2, an electrolytic capacitor C9, a resistor R4, a resistor R6, a capacitor C7, a resistor R8, a resistor R10, and a resistor R12. One end of the capacitor C2 is connected to the circuit between the fuse F1 and the transformer T1, and the other end is grounded. One end of the electrolytic capacitor C9 is connected to the circuit between the fuse F1 and the resistor R2, and the other end is connected to GND. One end of the resistor R4 is connected to one end of the input port of the transformer T1, and the other end is grounded through a light-emitting diode LED1. The resistor R6 is connected in parallel with the resistor R4. The resistor R10 is connected in parallel at both ends of the input port of the transformer T1. A diode D3 is connected to the circuit between the resistor R10 and the other end of the input port of the transformer T1. The resistor R12 and the capacitor C7 are connected in parallel and then connected in parallel with the resistor R10. The resistor R8 is connected in parallel with the capacitor C8. The output port of the transformer T1 outputs DC high voltage through a diode D. In this embodiment, the transformer T1 is a high-frequency transformer, and a high-voltage rectifying silicon column is provided inside the high-frequency transformer.

[0020] In this embodiment, the controller U1 is a high-performance fixed-frequency current-mode controller, with the model number UC3845B. The UC3845 controller is a high-performance fixed-frequency current-mode controller, which has an oscillator, can perform precise duty cycle control, temperature-compensated reference, high-gain error amplifier, current sampling comparator, and a large-current totem pole output inside, and drives a power field-effect transistor (MOSFET). The UC3845 controller has a low-voltage lockout threshold, that is, when its power supply voltage is less than or equal to 10V, the output stops; when it is greater than 10V, normal output can be enabled (the typical value is on at 16V and off at 10V), and the current mode operates up to 500KHZ. The functions of each port of the UC3845B controller are as follows:

[0021] 1-COMP: Compensation terminal. This pin is the output terminal of the internal error amplifier and can be used for loop compensation.

[0022] 2-VFB: Voltage feedback terminal. This pin is the inverting input terminal of the error amplifier. Usually, it is connected to the output of the switching power supply through a resistor. When the voltage value fed back at this terminal exceeds 2.5V, the output stops.

[0023] 3-ISENSE: Current sampling terminal. The pulse width modulator uses the voltage information fed back at this terminal to abort the conduction of the output switch. Usually, a current sampling resistor is connected to the source of the power field-effect transistor (MOSFET). If the voltage value fed back at this terminal exceeds 1V, the output stops.

[0024] 4-RT / CT: This port is mainly externally connected to a resistor R7 and a capacitor C4 to adjust the output frequency and the maximum output duty cycle, F = 1.72 / (RT*CT).

[0025] 5-VREF: Reference output terminal. This pin provides a charging current for the capacitor at the RT / CT terminal.

[0026] 6-VCC: Power supply terminal. When VCC is less than the threshold of the internal chip of the controller, there is no output.

[0027] 7-OUT: Output terminal. It can directly drive a power field-effect transistor (MOSFET) and output a current of up to 1A. When VCC is less than the threshold of the internal chip of the controller, there is no output. When the duty cycle reaches 50%, the output frequency is half of the oscillator.

[0028] 8-GROUND: Ground terminal.

[0029] In this embodiment, the controller U1 is externally connected with a resistor-capacitor PWM (pulse width modulation) signal through its RT / CT terminal. Specifically, an external resistor R7 and capacitor C4 are connected, and the frequency is F = 1.72 / (RT*CT). The frequency signal is output from the OUT of the controller U1 to control the switching state of the power field effect transistor Q1. It is a pulse signal with duty cycle control generated according to the input reference voltage VREF and feedback voltage VFB.

[0030] The pulse signal is coupled to the gate of the power field effect transistor Q1 through a parallel resistor-capacitor. Specifically, the pulse signal is coupled to the gate of the power field effect transistor Q1 through a parallel capacitor C17 and resistor R11. The load of the power field effect transistor Q1 is the input terminal of a high-frequency transformer T1. When the power field effect transistor Q1 is turned on, current passes through the primary coil of the transformer T1. During conduction, the high-frequency current generated by the power field effect transistor Q1 is transmitted to the secondary coil through the mutual inductance of the transformer T1, boosting the input voltage of the secondary coil of the transformer T1 to a high voltage of about 20,000V. There is a high-voltage rectifying silicon column in the high-voltage transformer, so the output is a 20,000V DC voltage, which is the ignition voltage. This voltage is output to the hydrogen furnace burner 1 for ignition through the diode D.

[0031] The 12V DC power supply in this embodiment has a power of 100W. A switching power supply, a storage battery, etc. can be used.

[0032] The igniter of the present utility model can achieve high-voltage ignition of the hydrogen furnace by converting 12V DC to 20,000V DC voltage. The present utility model is small in size and can directly be placed or installed near the ignition element to achieve high-voltage ignition. There is no need to use high-voltage cables to transmit high voltage, shortening the high-voltage path, effectively reducing the radiation interference and the electric shock risk during the ignition process, and having high safety.

[0033] Other components of the DC high-voltage hydrogen furnace igniter according to the embodiment of the present utility model, such as the controller U1 and the power field effect transistor Q1, etc., and the operations are known to those of ordinary skill in the art and will not be described in detail here.

[0034] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of the present utility model. The scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A DC high-voltage hydrogen furnace igniter, characterized in that, It includes a 12V DC power supply unit and a high-voltage generator unit. The power output terminal of the 12V DC power supply unit is connected to the high-voltage generator unit through the terminal block P1. The high-voltage generator unit includes a controller U1. The VFB terminal of the controller U1 is connected to the 1-pin of the terminal block PI through a resistor R3 and to GND through a capacitor C8. The 2-pin of the terminal block P1 is GND. The 3-pin of the terminal block P1 is sequentially connected to the VCC terminal of the controller U1 and one end of the input port of the transformer T1 through a diode D1 and a fuse F1 respectively. A diode D2 is connected in parallel with the diode D1. The ISENSE terminal of the controller U1 is connected to the source electrode of the power field effect transistor Q1. The drain electrode of the power field effect transistor is connected to the other end of the input port of the transformer T1. The source electrode of the power field effect transistor Q1 is connected to GND through a resistor R9. The RT / CT of the controller U1 is connected to GND through a capacitor C4 and to the VREF terminal of the controller U1 through a resistor R7. The VREF of the controller U1 is connected to GND through a capacitor C6. The VCC terminal of the controller U1 is connected to one end of the input port of the transformer T1 through a resistor R2 and to GND through a capacitor C5. An electrolytic capacitor C3 is connected in parallel with the capacitor C5. An electrolytic capacitor C1 is connected to the circuit between the resistor R9 and the electrolytic capacitor C3. The OUT terminal of the controller U1 is connected to the gate electrode of the power field effect transistor Q1 through a capacitor C17 and to GND through a resistor R5. A resistor R11 is connected in parallel with the capacitor C17. It also includes a capacitor C2, an electrolytic capacitor C9, a resistor R4, a resistor R6, a capacitor C7, a resistor R8, a resistor R10 and a resistor R12. One end of the capacitor C2 is connected to the circuit between the fuse F1 and the transformer T1, and the other end is grounded. One end of the electrolytic capacitor C9 is connected to the circuit between the fuse F1 and the resistor R2, and the other end is connected to GND. One end of the resistor R4 is connected to one end of the input port of the transformer T1, and the other end is grounded through a light-emitting diode LED1. The resistor R6 is connected in parallel with the resistor R4. The resistor R10 is connected in parallel across the two ends of the input port of the transformer T1. A diode D3 is connected to the circuit between the resistor R10 and the other end of the input port of the transformer T1. The resistor R12 and the capacitor C7 are connected in parallel and then in parallel with the resistor R10. The resistor R8 is connected in parallel with the capacitor C8. The output port of the transformer T1 outputs DC high voltage through a diode D.

2. The DC high-voltage hydrogen furnace igniter according to claim 1, characterized in that, The controller U1 is a high-performance fixed-frequency current-mode controller, and the model is UC3845B.

3. A DC high-voltage hydrogen furnace igniter according to claim 1, characterized in that, The transformer T1 is a high-frequency transformer, and a high-voltage rectifier silicon column is built in the high-frequency transformer.

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