Online test system for flameout detection circuit of gas stove

Abstract

The utility model provides an online test system for a flameout detection circuit of a gas stove, and belongs to the technical field of gas stoves. The problem that detection can only be carried out when the gas stove is closed in the prior art is solved. The online test system for the flameout detection circuit of the gas stove comprises a power supply voltage VCC, a high-voltage ignition induction module, a controller, an ion high-voltage generation module, a switch tube U31, a voltage comparator U1 and a signal processing module connected with the high-voltage ignition induction module, the switch tube U31 is connected with the controller, the power supply voltage VCC is connected with the ion high-voltage generation module through the switch tube U31, and the voltage comparator U1 is connected with the signal processing module through the voltage comparator U1. The voltage comparator U1 is connected with the signal processing module, the voltage comparator U1 is connected with the controller, and the controller is used for intermittently controlling the switching tube U31 to be switched off in a flame state so as to judge whether the gas stove flameout detection circuit breaks down or not through a signal output by the voltage comparator U1. According to the utility model, the safety detection of the flameout detection circuit during the operation of the gas stove is realized.

Description

Technical Field

[0001] This utility model belongs to the field of gas stove technology and relates to an online testing system for gas stove flameout detection circuit. Background Technology

[0002] In modern life, the safety of gas stoves, as a common kitchen cooking appliance, is of paramount importance. Regarding flame detection, early stoves lacked effective detection methods. If the flame were accidentally extinguished, gas could continue to leak, easily leading to serious safety accidents such as explosions and fires. Later, flame detection technology based on the thermocouple principle emerged. While it could detect flames to some extent, its response speed was slow, it was easily affected by environmental factors, and its detection accuracy was limited.

[0003] In recent years, flame detection technology based on the principle of ion sensing has been widely used. When gas burns, it produces ions, which are detected by an ion sensing needle, forming a weak current signal. This signal is then processed by the circuit to determine the presence of a flame. However, existing flame detection technologies based on the principle of ion sensing still have some problems. For example, if key components fail, the gas stove may misjudge the flame in complex environments, causing the controller to fail to correctly identify the flame status and thus fail to cut off the gas supply in time, greatly increasing safety hazards. To address this safety hazard, existing detection methods involve periodically visually inspecting the various hardware components of the ion sensing flameout protection circuit and using specialized single-component measuring instruments to measure the parameters of key components in the circuit. However, these tests can only be performed when the gas stove is off, resulting in insufficient real-time performance and effectiveness. Summary of the Invention

[0004] The purpose of this utility model is to address the aforementioned problems in the existing technology by proposing an online testing system for the flameout detection circuit of a gas stove. The technical problem it aims to solve is: how to achieve safe testing of the flameout detection circuit during gas stove operation.

[0005] The objective of this utility model can be achieved through the following technical solution: an online testing system for a gas stove flameout detection circuit, comprising a power supply voltage VCC and a high-voltage ignition sensing module for realizing gas ignition and sensing the ion current generated by the flame. The online testing system also includes a controller, an ion high-voltage generating module for connecting with the furnace metal body to generate ion voltage, a switch U31 for controlling the power supply to the ion high-voltage generating module, a signal processing module connected to the high-voltage ignition sensing module for processing the transmitted ion current, and a voltage comparator U1 for judging the flame state of the gas stove. The control terminal of the switch U31 is connected to the output terminal of the controller. The power supply voltage VCC is connected to the ion high-voltage generating module through the switch U31. The positive input terminal of the voltage comparator U1 is connected to the signal processing module. The negative input terminal of the voltage comparator U1 is grounded. The output terminal of the voltage comparator U1 is connected to the input terminal of the controller. The controller is used to determine whether the gas stove flameout detection circuit is faulty by intermittently controlling the switch U31 to disconnect when there is a flame, and then using the signal output from the output terminal of the voltage comparator U1.

[0006] In operation, the online testing system for the gas stove flameout detection circuit supplies power to the ion high-voltage generation module via the switching transistor U31. This allows the ion high-voltage generation module to generate the high voltage required for ion sensing, providing the conditions for the high-voltage ignition sensing module to sense the flame ion current. When the gas stove is burning, the ions in the flame are sensed by the high-voltage ignition sensing module, generating an ion current. This ion current is processed by the signal processing module and then input to the positive input of the voltage comparator U1. The voltage comparator U1 amplifies and identifies the ion current signal, determines the presence of a flame, and transmits the processed signal to the controller. During normal combustion and when the gas stove flameout detection circuit is working properly, the controller receives a signal indicating the presence of a flame, and the gas stove continues to operate normally. If the gas stove flameout detection circuit fails, for example, if the voltage comparator U1 fails, the controller will be unable to identify the flame status. In this case, to detect whether the gas stove flameout detection circuit has failed, the system cuts off the power supply to the ion high-voltage generation module by turning off the switching transistor U31, thereby cutting off the ion voltage and causing the ion current to disappear. This system artificially creates a flameless state when there is originally a flame by intermittently switching off the switch U31. The intermittent switching refers to the controlled interval between turning off and on, without affecting the normal operation of the gas stove. The system then observes whether the voltage comparator U1 outputs when the switch U31 is off, thus determining if the gas stove's flameout detection circuit is faulty. If the voltage comparator U1 outputs abnormally, the controller can issue a warning indicating the fault. Furthermore, the controller can activate flameout protection measures based on this situation, shutting off the gas supply to prevent gas leaks and other hazards. This online testing system enables safe detection of the gas stove during operation, providing more accurate detection and effectively avoiding situations where the flame signal cannot be accurately obtained due to voltage comparator U1 failure or a malfunction in the entire gas stove flameout detection circuit, thus significantly improving the safety of gas stove use.

[0007] In the above-mentioned online testing system for the gas stove flameout detection circuit, the ion high-voltage generating module includes an ion transformer T2, a resistor R32, a capacitor C13, a transistor U24, a Zener diode D9, and a resistor R33. Pin 1 of the ion transformer T2 is connected to the collector of the switching transistor U31 through capacitor C13. Pin 1 of the ion transformer T2 is also connected to the base of the transistor U24. Pin 2 of the ion transformer T2 is connected to the collector of the transistor U24 and the positive terminal of the Zener diode D9, respectively. The emitter of the transistor U24 and the negative terminal of the Zener diode D9 are both connected to the collector of the switching transistor U31. A resistor R32 is connected between pins 3 and 4 of the ion transformer T2. Pin 4 of the ion transformer T2 is grounded through a resistor R80. A capacitor C15 is also connected between pin 4 of the ion transformer T2 and the collector of the switching transistor U31. Pin 6 of the ion transformer T2 is connected to the furnace metal body through resistor R33. The high voltage required for induction is generated by ion transformer T2 and related components, which, together with the high-voltage ignition sensing module, senses the ion current of the flame.

[0008] In the aforementioned online testing system for the gas stove flameout detection circuit, the signal processing module includes resistors R36, R37, R38, R39, R40, and R41, capacitor C16, diode D10, and diode D11. One end of resistor R37 is connected to the high-voltage ignition sensing module, and the other end is connected to resistors R38 and R39 in sequence, and then connected to the positive input terminal of voltage comparator U1. The connection point between resistors R38 and R39 is connected to one end of capacitor C16 and diode D11. The positive terminal of resistor R10 and the negative terminal of diode D11, the other end of capacitor C16, the negative terminal of diode D10, and the positive terminal of diode D11 are all grounded. Capacitor C17 is also connected to the connection point between resistor R39 and the positive input terminal of voltage comparator U1. Resistors R40 and R41 are connected in series, with one end connected to resistor R39 and the other end connected to the supply voltage VCC. The other end of resistor R37 is connected to one end of resistor R36, and the other end of resistor R36 is connected to pin 5 of ion transformer T2 through capacitor C12. The signal processing module processes the ion current generated by the flame combustion and inputs it to voltage comparator U1, which then determines the flame condition.

[0009] In the aforementioned online testing system for the gas stove flameout detection circuit, the online testing system also includes diode U25, resistor R42, and capacitor C18. The positive terminal of diode U25 is connected to the power supply voltage VCC, and the negative terminal of diode U25 is connected to one end of resistor R42. The other end of resistor R42 is connected to the output terminal of voltage comparator U1. One end of capacitor C18 is connected to the output terminal of voltage comparator U1, and the other end is grounded. Diode U25 is a light-emitting diode, which can display the detected flame state by lighting up, making the judgment more intuitive.

[0010] In the aforementioned online testing system for the gas stove flameout detection circuit, the high-voltage ignition sensing module includes a high-voltage transformer T1 and a high-voltage ignition sensing needle. Pins 1 and 2 of the high-voltage transformer T1 are connected to the power supply, pin 4 of the high-voltage transformer T1 is connected to the high-voltage ignition sensing needle, and pin 3 of the high-voltage transformer T1 is connected to the signal processing module. After the high-voltage transformer T1 is connected to the power supply, the voltage is increased through its internal windings, generating a high-voltage spark at the high-voltage ignition sensing needle to ignite the gas.

[0011] In the aforementioned online testing system for the gas stove flameout detection circuit, the online testing system also includes capacitor C14. The positive terminal of capacitor C14 is connected to the power supply voltage VCC, and the negative terminal of capacitor C14 is grounded. Capacitor C14 is used for filtering.

[0012] In the aforementioned online testing system for the gas stove flameout detection circuit, the online testing system also includes a resistor R81. One end of resistor R81 is connected to the connection point where resistor R80, capacitor C15, and pin 4 of ion transformer T2 are connected, and the other end of resistor R81 is connected to the controller. The controller, connected to resistor R81, can detect the current of the ion high-voltage generating module, determine whether the ion high-voltage generating module is working properly, and further improve the reliability and accuracy of the online testing system.

[0013] Compared with existing technologies, this online testing system for gas stove flameout detection circuits has the following advantages:

[0014] This invention can accurately detect the flame status and then feed the flame status back to the subsequent circuit through the controller, thereby improving the safety of gas stove use.

[0015] This invention, through the setting of the switching tube U31, can artificially create a flameless state when there is a flame. By intermittently cutting off the switching tube U31, the output of the voltage comparator U1 can be used to determine whether the voltage comparator U2 or the entire gas stove flameout detection circuit is faulty, without affecting the normal operation of the gas stove. The circuit detection has better real-time performance, thereby improving the safety of gas stove use. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the circuit structure of this utility model.

[0017] In the diagram, 1. High-voltage ignition sensing module; 11. High-voltage ignition sensing needle; 2. Signal processing module; 3. Ion high-voltage generation module; 4. Furnace metal body; 5. Controller. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0019] like Figure 1 As shown, this online testing system for the gas stove flameout detection circuit includes a controller 5, a power supply voltage VCC, a high-voltage ignition sensing module 1 for realizing gas ignition and sensing the ion current generated by the flame, an ion high-voltage generating module 3 for connecting to the furnace metal body 4 to generate ion voltage, a switch U31 for controlling the power supply to the ion high-voltage generating module 3, a signal processing module 2 connected to the high-voltage ignition sensing module 1 for processing the transmitted current signal, and a voltage comparator U1 for judging the flame state of the gas stove. The control terminal of the switch U31 is connected to the output terminal of the controller 5. The power supply voltage VCC is connected to the ion high-voltage generating module 3 through the switch U31. The positive input terminal of the voltage comparator U1 is connected to the signal processing module 2. The negative input terminal of the voltage comparator U1 is grounded. The output terminal of the voltage comparator U1 is connected to the input terminal of the controller 5. The controller 5 is used to intermittently control the switch U31 to disconnect when there is a flame, and then judge whether the voltage comparator U1 is faulty by the signal output from the output terminal of the voltage comparator U1.

[0020] In this embodiment, the ion high voltage generating module 3 includes an ion transformer T2, a resistor R32, a capacitor C13, a transistor U24, a Zener diode D9, and a resistor R33. Pin 1 of the ion transformer T2 is connected to the collector of the switching transistor U31 through the capacitor C13. The emitter of the switching transistor U31 is connected to the power supply voltage VCC. A capacitor C14 is also connected between the power supply voltage VCC and ground. The base of the switching transistor U31 is connected to the emitter of the switching transistor U31 through the resistor R74. The base of the switching transistor U31 is also connected to the controller 5 through the resistor R75. Pin 1 of ion transformer T2 is also connected to the base of transistor U24. Pin 2 of ion transformer T2 is connected to the collector of transistor U24 and the positive terminal of Zener diode D9, respectively. The emitter of transistor U24 and the negative terminal of Zener diode D9 are both connected to the collector of switching transistor U31. Resistor R32 is connected between pins 3 and 4 of ion transformer T2. Pin 4 of ion transformer T2 is grounded through resistor R80. Capacitor C15 is also connected between pin 4 of ion transformer T2 and the collector of switching transistor U31. The connection point of resistor R80, capacitor C15 and pin 4 of ion transformer T2 is connected to controller 5 through resistor R81. Pin 6 of ion transformer T2 is connected to furnace metal body 4 through resistor R33.

[0021] Signal processing module 2 includes resistors R36, R37, R38, R39, R40, and R41, capacitor C16, diodes D10 and D11. One end of resistor R37 is connected to pin 3 of high-voltage transformer T1, and the other end is connected to resistors R38 and R39 in sequence, then connected to pin 2 of voltage comparator U1. The connection point between resistors R38 and R39 is connected to one end of capacitor C16, the anode of diode D10, and the cathode of diode D11. The other end of capacitor C16 is connected to the cathode of diode D10 and the anode of diode D11. All terminals are grounded. A capacitor C17 is connected to the connection point between resistor R39 and pin 2 of voltage comparator U1. Resistors R40 and R41 are connected in series, with one end connected to resistor R39 and the other end connected to the supply voltage VCC. The supply voltage VCC is also connected to pin 8 of voltage comparator U1. Pin 3 of voltage comparator U1 is grounded. The other end of resistor R37 is connected to one end of resistor R36. The other end of resistor R36 is connected to pin 5 of ion transformer T2 through capacitor C12. A varistor R34 is connected between pin 3 of high-voltage transformer T1 and pin 6 of ion transformer T2. The online testing system also includes diode U25, resistor R42, and capacitor C18. The anode of diode U25 is connected to the supply voltage VCC, and the cathode of diode U25 is connected to one end of resistor R42. The other end of resistor R42 is connected to the output of voltage comparator U1. One end of capacitor C18 is connected to the output of voltage comparator U1, and the other end is grounded.

[0022] The high-voltage ignition sensing module 1 includes a high-voltage transformer T1 and a high-voltage ignition sensing needle 11. Pins 1 and 2 of the high-voltage transformer T1 are used to connect to the power supply, pin 4 of the high-voltage transformer T1 is connected to the high-voltage ignition sensing needle 11, and pin 3 of the high-voltage transformer T1 is connected to the signal processing module 2.

[0023] In this embodiment, the switching transistor U31 is a transistor; in addition to a transistor, a MOSFET or a relay can also be used. The controller 5 is a microcontroller. The voltage comparator U1 can be an LM393 comparator.

[0024] When this gas stove flameout detection circuit online testing system is in use, the high-voltage transformer is connected to the power supply. After connection, the windings inside the high-voltage transformer T1 boost the voltage, generating an electric spark through the connected high-voltage ignition sensing needle 11 to ignite the gas. Simultaneously, the controller 5 controls the switching transistor U31 to conduct, and the supply voltage VCC supplies power to the ion high-voltage generation module 3 through the switching transistor U31, enabling the ion high-voltage generation module 3 to generate the high voltage required for ion sensing, providing the conditions for sensing the flame ion current. When the gas stove has a flame, the ions in the flame are sensed by the high-voltage ignition sensing needle 11, generating an ion current. This ion current is rectified and filtered by the signal processing module 2 and then input to the positive input terminal of the voltage comparator U1. The voltage comparator U1 amplifies and identifies the ion current signal. When there is a flame, it outputs a flame detection signal to the controller 5. It can also provide a light indication through the diode U25. When there is no flame, it outputs a flame-free detection signal to the controller 5. This signal provides the operation signal for subsequent circuits, such as triggering re-ignition or issuing an alarm signal. When combustion is normal and voltage comparator U1 is working properly, controller 5 receives a signal indicating the presence of a flame, and the gas stove continues to operate normally. If voltage comparator U1 fails, controller 5 will be unable to identify the flame status. In this case, the power supply to the ion high-voltage generating module 3 is cut off by turning off switch U31, thereby cutting off the ion voltage and causing the ion current to disappear. This artificially creates a flameless state when there was originally a flame. By intermittently turning off switch U31, the output of voltage comparator U1 is observed to determine whether voltage comparator U1 or the entire gas stove flameout detection circuit is faulty. If the output of voltage comparator U1 is abnormal, controller 5 can issue a warning indicating the fault. Furthermore, controller 5 can also activate flameout protection measures based on this situation, closing the gas passage to prevent gas leaks and other hazards. The use of this online testing system enables safe detection during gas stove operation, providing more accurate detection and effectively avoiding situations where flame signals cannot be accurately obtained due to voltage comparator U1 failure or gas stove flameout detection circuit malfunction, thus effectively improving the safety of gas stove use.

[0025] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. An online testing system for a gas stove flameout detection circuit, comprising a power supply voltage VCC and a high-voltage ignition sensing module (1) for realizing gas ignition and inducing the ion current generated by the flame, characterized in that, The online testing system also includes a controller (5), an ion high voltage generating module (3) for connecting with the furnace metal body (4) to generate ion voltage, a switch tube U31 for controlling the power supply of the ion high voltage generating module (3), a signal processing module (2) connected to the high voltage ignition sensing module (1) for processing the transmitted ion current, and a voltage comparator U1 for judging the flame status of the gas stove. The control terminal of the switch tube U31 is connected to the output terminal of the controller (5). The power supply voltage VCC is connected to the ion high voltage generating module (3) through the switch tube U31. The positive input terminal of the voltage comparator U1 is connected to the signal processing module (2). The negative input terminal of the voltage comparator U1 is grounded. The output terminal of the voltage comparator U1 is connected to the input terminal of the controller (5). The controller (5) is used to determine whether the gas stove flameout detection circuit is faulty by intermittently controlling the switch tube U31 to disconnect and then outputting the signal through the output terminal of the voltage comparator U1 when there is a flame.

2. The online testing system for gas stove flameout detection circuit according to claim 1, characterized in that, The high-voltage ion generating module (3) includes an ion transformer T2, a resistor R32, a capacitor C13, a transistor U24, a Zener diode D9, and a resistor R33. Pin 1 of the ion transformer T2 is connected to the collector of the switching transistor U31 through the capacitor C13. Pin 1 of the ion transformer T2 is also connected to the base of the transistor U24. Pin 2 of the ion transformer T2 is connected to the collector of the transistor U24 and the positive terminal of the Zener diode D9, respectively. The emitter of the transistor U24 and the negative terminal of the Zener diode D9 are both connected to the collector of the switching transistor U31. A resistor R32 is connected between pins 3 and 4 of the ion transformer T2. Pin 4 of the ion transformer T2 is grounded through a resistor R80. A capacitor C15 is also connected between pin 4 of the ion transformer T2 and the collector of the switching transistor U31. Pin 6 of the ion transformer T2 is connected to the furnace metal body (4) through a resistor R33.

3. The online testing system for the gas stove flameout detection circuit according to claim 2, characterized in that, The signal processing module (2) includes resistors R36, R37, R38, R39, R40, and R41, capacitor C16, diode D10, and diode D11. One end of resistor R37 is connected to the high-voltage ignition sensing module (1), and the other end is connected to resistors R38 and R39 in sequence, and then connected to the positive input terminal of voltage comparator U1. The connection point of resistors R38 and R39 is connected to one end of capacitor C16, the positive terminal of diode D10, and the diode D11. The negative terminal of diode D11, the other end of capacitor C16, the negative terminal of diode D10, and the positive terminal of diode D11 are all grounded. A capacitor C17 is also connected to the connection point of resistor R39 and the positive input terminal of voltage comparator U1. One end of resistors R40 and R41 are connected in series to resistor R39, and the other end is connected to the supply voltage VCC. The other end of resistor R37 is connected to one end of resistor R36. The other end of resistor R36 is connected to pin 5 of ion transformer T2 through capacitor C12.

4. The online testing system for gas stove flameout detection circuit according to claim 1, 2, or 3, characterized in that, The online testing system also includes a diode U25, a resistor R42, and a capacitor C18. The positive terminal of the diode U25 is connected to the power supply voltage VCC, the negative terminal of the diode U25 is connected to one end of the resistor R42, the other end of the resistor R42 is connected to the output terminal of the voltage comparator U1, one end of the capacitor C18 is connected to the output terminal of the voltage comparator U1, and the other end is grounded.

5. The online testing system for gas stove flameout detection circuit according to claim 1, 2, or 3, characterized in that, The high-voltage ignition sensing module (1) includes a high-voltage transformer T1 and a high-voltage ignition sensing needle (11). Pins 1 and 2 of the high-voltage transformer T1 are used to connect to the power supply. Pin 4 of the high-voltage transformer T1 is connected to the high-voltage ignition sensing needle (11). Pin 3 of the high-voltage transformer T1 is connected to the signal processing module (2).

6. The online testing system for gas stove flameout detection circuit according to claim 1, 2, or 3, characterized in that, The online testing system also includes a capacitor C14, the positive terminal of which is connected to the power supply voltage VCC, and the negative terminal of which is grounded.

7. The online testing system for the gas stove flameout detection circuit according to claim 2 or 3, characterized in that, The online testing system also includes a resistor R81, one end of which is connected to the connection point of resistor R80, capacitor C15 and pin 4 of ion transformer T2, and the other end of which is connected to the controller (5).

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