CN221301392U - Control system for gas cooker and gas cooker - Google Patents

Abstract

Embodiments of the present utility model provide a control system for a gas cooker and a gas cooker. The control system comprises a control device, a first control circuit, a first switch circuit and an electromagnetic valve. The electromagnetic valve is arranged on a gas pipeline of the gas cooker. The first control circuit and the first switch circuit are sequentially connected in series between the control device and the electromagnetic valve. The control device is used for sending a pulse width modulation signal to the first control circuit under the condition that the gas cooker works. The first control circuit is used for controlling the first switching circuit to be switched off based on the pulse width modulation signal so as to maintain the electromagnetic valve to be switched on, and controlling the first switching circuit to be switched on when the pulse width modulation signal is not received so as to switch off the electromagnetic valve. The technical scheme ensures that the electromagnetic valve on the gas pipeline can be automatically and forcedly closed when the control device fails. Therefore, the gas cooker can be automatically and timely turned off, and the use safety of the gas cooker is ensured.

Description

Control system for gas cooker and gas cooker

Technical Field

The utility model relates to the field of kitchen appliances, in particular to a control system for a gas cooker and the gas cooker.

Background

Gas cookers have been widely used as kitchen appliances.

Currently, some gas cookers have an automatic fire-closing function, such as timing automatic fire closing. The control system of the gas cooker comprises an electromagnetic valve for controlling a gas passage of the gas cooker and a singlechip connected with the electromagnetic valve. When the timing is finished, the singlechip in the control system sends out a control signal to close the electromagnetic valve, so that the gas passage of the gas cooker is cut off, and the aim of automatically closing the gas cooker is fulfilled.

However, when the single-chip microcomputer fails, the electromagnetic valve may not be automatically closed in time as desired by a user, thereby causing scorching of food or even causing fire. Therefore, the currently used gas cooker with the automatic fire closing function has a certain potential safety hazard.

Disclosure of utility model

The present utility model has been made in view of the above-described problems.

According to one aspect of the present utility model, there is provided a control system for a gas cooker, comprising: the control device, the first control circuit, the first switch circuit and the electromagnetic valve. The electromagnetic valve is arranged on a gas pipeline of the gas cooker. The first switch circuit is connected with the power supply and the electromagnetic valve and is used for controlling connection of the electromagnetic valve and the power supply. The control device is connected with the first control circuit and is used for sending a pulse width modulation signal to the first control circuit under the condition that the gas cooker works. The first control circuit is also connected with the first switch circuit and is used for controlling the first switch circuit to be disconnected based on the pulse width modulation signal so as to maintain the electromagnetic valve to be opened, and controlling the first switch circuit to be connected when the pulse width modulation signal is not received so as to enable the electromagnetic valve to be disconnected.

In the above technical solution, the control device sends a pulse width modulation signal to the first control circuit to control the first switch circuit to be turned off, so as to maintain the open state of the electromagnetic valve. When the control device fails, the first control circuit controls the first switch circuit to be conducted and forcibly closes the electromagnetic valve. The scheme not only realizes the normal control of the control device in the gas cooker on the on-off of the gas pipeline, but also ensures that the electromagnetic valve on the gas pipeline can be automatically and forcedly closed when the control device fails. Therefore, the gas cooker can be automatically and timely turned off, and the use safety of the gas cooker is ensured.

The first control circuit comprises a charging circuit and a first capacitor, the charging circuit and the first capacitor are sequentially connected in series between the control device and the first switch circuit, the charging circuit is used for charging the first capacitor based on the pulse width modulation signal so as to control the first switch circuit to keep off, and the first switch circuit is turned on when the pulse width modulation signal is not received.

In the technical scheme, on the basis of the pulse width modulation signal sent by the control device, the on-off of the first switch circuit can be accurately controlled through the charging circuit and the first capacitor, so that the gas stove is ensured to be closed in time under the condition of failure of the control device, and the use safety of the gas stove is effectively improved. In addition, the technical scheme effectively utilizes the charge and discharge characteristics of the capacitor, and has the advantages of easy realization, strong reliability and lower cost.

The charging circuit comprises a first resistor and a first switching tube, wherein a control end of the first switching tube is connected with the control device, the other two ends of the first switching tube are respectively connected with a first end of the first resistor and a first capacitor, and a second end of the first resistor is used for being connected with a power supply.

In the technical scheme, the first resistor and the first switch tube which are connected in series are arranged in the charging circuit, so that the on-off of the first switch circuit is further accurately controlled, the kitchen range is further ensured to be closed in time under the condition that the control device fails, and the use safety of the gas stove is effectively improved. Moreover, the implementation cost of the charging circuit is low.

The first switch circuit includes a second switch tube, a second resistor and a third resistor, wherein a control end of the second switch tube is connected with the first capacitor, the other two ends of the second switch tube are respectively connected with a power supply and a first end of the second resistor, a second end of the second resistor is connected with the electromagnetic valve, a first end of the third resistor is connected with a control end of the second switch tube, and a second end of the third resistor is grounded.

In the technical scheme, the first switching circuit is switched on and off through the first switching tube, so that the electromagnetic valve is automatically controlled as expected, and the stability and safety of a circuit are ensured by the resistor arranged in the first switching circuit. Therefore, when the gas cooker fails, the gas can be timely cut off and fire can be timely turned off.

The control system further includes a fourth resistor connected between the first capacitor and the first switching circuit.

In the above technical solution, a fourth resistor is provided between the first capacitor and the first switching circuit. This can effectively prevent breakdown of the first switching tube in the case of an excessive circuit current, and can effectively filter out signal interference caused when the voltage of the first capacitor fluctuates. Thereby, the safety of the control system and the accuracy of the control operation are ensured.

The control system further includes a first diode having a negative electrode connected to the first terminal, the first terminal being located on a circuit between the charging circuit and the first capacitor, a positive electrode of the first diode being grounded.

In the technical scheme, the circuit between the charging circuit and the first capacitor is connected in series with the grounded diode, so that the first capacitor can be charged smoothly, and high-frequency noise and interference signals in the circuit can be effectively restrained.

The control system further comprises a second control circuit and a driving circuit, wherein the first end of the second control circuit is connected with the control device, the second end of the second control circuit is connected with the electromagnetic valve, the driving circuit is connected with the third end of the second control circuit, and the second control circuit is used for controlling the electromagnetic valve to be opened under the driving of the driving circuit when the gas stove starts to work.

In the technical scheme, under the action of the power supply voltage generated by the driving circuit controlled by the control device, the second control circuit enables the electromagnetic valve to be opened, so that the gas cooker is ignited and continuously burnt. Through above-mentioned second control circuit and drive circuit, can keep the solenoid valve of gas cooking utensils open, and then keep gas cooking utensils in operating condition all the time, improved its user experience.

The second control circuit includes a fifth resistor, a third switching tube, a sixth resistor and a fourth switching tube, wherein the control end of the third switching tube is connected with the control device through the fifth resistor, the other two ends of the third switching tube are respectively connected with the positive voltage power supply and the control end of the fourth switching tube, the control end of the fourth switching tube is also connected with the driving circuit through the sixth resistor, and the other two ends of the fourth switching tube are respectively connected with the electromagnetic valve and the driving circuit.

In the technical scheme, the second control circuit is realized by the switch tube and the resistor, and the circuit has strong reliability and low cost.

The driving circuit includes a fifth switching tube, a first branch, a second diode and a seventh resistor, wherein the control end of the fifth switching tube is connected with the control device, the other two ends of the fifth switching tube are respectively connected with the positive voltage power supply and the negative electrode of the second diode, the positive electrode of the second diode is connected with the second control circuit, the first branch includes a second capacitor and a first inductor which are connected in series, the two ends of the first branch are respectively connected with the positive electrode of the second diode and the negative electrode of the second diode, the two ends of the seventh resistor are respectively connected with the two ends of the second capacitor, and the end, connected with the first inductor, of the second capacitor is also grounded.

In the technical scheme, the second control circuit is provided with negative voltage through the stable voltage output generated by the second capacitor in the driving circuit, so that the switching fire of the gas cooker is accurately controlled, and the stability and safety of the gas cooker are further improved.

According to another aspect of the utility model there is provided a gas cooker comprising a control system for a gas cooker as described above.

The gas cooker adopting the control system sends a pulse width modulation signal to the first control circuit through the control device to control the first switch circuit to be disconnected, so that the opening state of the electromagnetic valve is maintained. When the control device fails, the first control circuit controls the first switch circuit to be conducted and forcibly closes the electromagnetic valve. The scheme not only realizes the normal control of the control device in the gas cooker on the on-off of the gas pipeline, but also ensures that the electromagnetic valve on the gas pipeline can be automatically and forcedly closed when the control device fails. Therefore, the gas cooker can be automatically and timely turned off, and the use safety of the gas cooker is ensured.

The foregoing description is only an overview of the present utility model, and is intended to be implemented in accordance with the teachings of the present utility model in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present utility model more readily apparent.

Drawings

The above and other objects, features and advantages of the present utility model will become more apparent from the following more particular description of embodiments of the present utility model, as illustrated in the accompanying drawings. The accompanying drawings are included to provide a further understanding of embodiments of the utility model and are incorporated in and constitute a part of this specification, illustrate the utility model and together with the embodiments of the utility model, and not constitute a limitation to the utility model. In the drawings, like reference numerals generally refer to like parts or steps.

FIG. 1 shows a schematic block diagram of a control system for a gas cooker according to an exemplary embodiment of the utility model;

Fig. 2 shows a schematic circuit diagram of a control system for a gas cooker according to an exemplary embodiment of the utility model.

Detailed Description

In order to make the objects, technical solutions and advantages of the present utility model more apparent, exemplary embodiments according to the present utility model will be described in detail with reference to the accompanying drawings. It should be apparent that the described embodiments are only some embodiments of the present utility model and not all embodiments of the present utility model, and it should be understood that the present utility model is not limited by the example embodiments described herein. Based on the embodiments of the utility model described in the present application, all other embodiments that a person skilled in the art would have without inventive effort shall fall within the scope of the utility model.

According to one aspect of the present utility model, a control system for a gas cooker is provided. Fig. 1 shows a schematic block diagram of a control system for a gas hob according to an exemplary embodiment of the present utility model. Fig. 2 shows a schematic circuit diagram of a control system for a gas cooker according to an exemplary embodiment of the utility model. As shown in fig. 1 and 2, the control system for the gas cooker includes a control device 10, a first control circuit 20, a first switching circuit 30, and a solenoid valve 40. The solenoid valve 40 is provided on the gas line of the gas cooker. The first switch circuit 30 is connected to the power supply and the solenoid valve 40, and the first switch circuit 30 is used for controlling connection of the solenoid valve 40 to the power supply. The control device 10 is connected to a first control circuit 20, the control device 10 being adapted to send a Pulse Width Modulation (PWM) signal to the first control circuit 20 in case of operation of the gas hob. The first control circuit 20 is also connected to a first switching circuit 30. The first control circuit 20 is configured to control the first switch circuit 30 to be turned off based on the pwm signal, so as to maintain the solenoid valve 40 to be opened; the first switching circuit 30 is controlled to be turned on when the pwm signal is not received, so that the solenoid valve 40 is turned off.

Illustratively, the solenoid valve 40 may be a two-position, two-way solenoid valve. Alternatively, the solenoid valve 40 may include a spool and a coil for controlling the spool. The first switching circuit 30 may connect the coil and the power source, thereby controlling whether the coil is energized or not. When the first switching circuit 30 is open, the coil and power supply may be disconnected, with the spool in the first position. When the valve element is in the first position, the solenoid valve 40 is opened and the gas line of the gas cooker is in communication. When the first switching circuit 30 is on, the coil may be connected to a power source and the spool is in the second position. When the valve element is in the second position, the solenoid valve 40 is turned off, and the gas line of the gas cooker is also turned off.

In one exemplary embodiment, as shown in fig. 2, the solenoid valve 40 may include a spool and second and third coils L2 and L3 for controlling the spool. The first switching circuit 30 may be connected to the second coil L2 and the power supply, thereby controlling the connection of the second coil L2 and the power supply. The third coil L3 is connected to the thermocouple S1.

When the gas cooker starts to work normally, i.e. ignites its flame, the thermocouple S1 is heated by its flame, generating an electric potential. This potential acts on the third coil L3. The third coil L3 generates a pulling force on the spool. The first switching circuit 30 is disconnected and the second coil L2 is disconnected from the power supply. Thus, the electromagnetic valve 40 is opened, and the combustion line is brought into a communication state, so that the flame is maintained to burn normally. Further, in this embodiment, when the first switching circuit 30 is turned on, the second coil L2 may be connected to a power source, which generates a reverse pulling force greater than that generated by the third coil L3, the solenoid valve 40 is turned off, and the gas line of the gas cooker is also turned off. In addition, once the fire is extinguished by the strong wind or the overflow of the soup, the electric potential generated by the thermocouple S1 is quickly reduced to zero, the third coil L3 is deenergized and the solenoid valve 40 is caused to be turned off. Thereby, the solenoid valve 40 shuts off the gas passage and terminates the gas supply to the gas cooker, thereby securing the gas cooker in use.

In the embodiment of the present application, the control device 10 controls the on and off of the first switch circuit 30 via the first control circuit 20 by using the pulse width modulation signal, and further controls the opening and closing of the solenoid valve 40. The implementation of the control device 10 is not limited in any way, and any device that can be used to perform operations and process tasks is within the scope of the present application, such as a chip. Specifically, the control device 10 may be implemented using any of the following: a programmable gate array (FPGA), a Microprocessor (MPU), a Programmable Logic Controller (PLC), a micro-processing unit (MCU), etc. Taking the control device 10 as a microprocessor for example, each circuit connected with the control device 10 may be respectively connected to each different pin of the microprocessor.

Illustratively, when the gas cooker starts to operate, the control device 10 monitors the ignition signal and starts to send a pulse width modulated signal to the first control circuit 20. When the gas hob is in an operating state, if the control device 10 is operating normally, it always keeps sending the pulse width modulated signal to the first control circuit 20. During receipt of the pwm signal by the first control circuit 20, it controls the first switching circuit 30 to be in an off state. As described above, when the first switching circuit 30 is turned off, the solenoid valve 40 is opened, and the gas range is in a continuous combustion state. When the control device 10 fails, it will not be able to send a pulse width modulated signal, but a high level signal or a low level signal. The first control circuit 20 cannot receive the pwm signal, and at this time, it controls the first switch circuit 30 to be turned on. Thereby, the electromagnetic valve of the gas cooker is turned off, and the flame of the gas cooker is forced to be extinguished.

In the above-described embodiments, the control device 10 sends a pulse width modulation signal to the first control circuit 20 to control the first switch circuit 30 to be turned off, so as to maintain the open state of the solenoid valve 40. When the control device 10 fails, the first control circuit 20 controls the first switching circuit 30 to be turned on and forcibly closes the solenoid valve 40. The scheme not only realizes the normal control of the on-off of the control device 10 in the gas stove on the gas pipeline, but also ensures that the electromagnetic valve on the gas pipeline can be automatically and forcedly closed when the control device 10 fails. Therefore, the gas cooker can be automatically and timely turned off, and the use safety of the gas cooker is ensured.

In some embodiments, the first control circuit 20 may include a charging circuit and a first capacitor C1. The charging circuit and the first capacitor C1 are sequentially connected in series between the control device 10 and the first switch circuit 30, and the charging circuit is configured to charge the first capacitor C1 based on the pulse width modulation signal, so as to control the first switch circuit 30 to keep off, and when the pulse width modulation signal is not received, the first switch circuit 30 is turned on.

The charging circuit continuously charges the first capacitor C1 after receiving the pwm signal sent by the control device 10, so as to ensure that the first capacitor C1 is in a charged state. At this time, the first switching circuit 30 connected to the first capacitor C1 is in an off state. When the charging circuit does not receive the pwm signal sent by the control device 10, the first capacitor C1 cannot be charged, and the first switch circuit 30 connected to the first capacitor C1 is in a conductive state.

In this technical scheme, based on the pulse width modulation signal that controlling means 10 sent, through charging circuit and first electric capacity C1, can control the switching-on and the switching-off of first switch circuit 30 accurately, and then guarantee in time to close gas cooking utensils under controlling means 10 trouble's condition, improve gas cooking utensils's safety in utilization effectively. In addition, the technical scheme effectively utilizes the charge and discharge characteristics of the capacitor, and has the advantages of easy realization, strong reliability and lower cost.

In some embodiments, the charging circuit may include a first resistor R1 and a first switching tube Q1. The control end of the first switching tube Q1 is connected with the control device 10, and the other two ends of the first switching tube Q1 are respectively connected with the first end of the first resistor R1 and the first capacitor C1. The second end of the first resistor R1 is connected with a power supply.

The first switching transistor Q1 may be a semiconductor device such as a triode or a MOS transistor. In the embodiment of the present application, no limitation is made. Any semiconductor device that can control the circuit current between the other two ends by the current of the control end is within the protection scope of the present application.

Taking the first switching tube Q1 as a triode for example, the base electrode of the triode is connected with the control device 10, the emitter electrode of the triode is connected with the first capacitor C1, the collector electrode of the first switching tube Q1 is connected with one end of the first resistor R1, and the other end of the first resistor R1 is connected with a positive voltage power supply. When the pwm signal sent by the control device 10 is sent to the base electrode of the triode, the emitter electrode and the collector electrode of the triode are conducted and the first capacitor C1 is continuously charged, so that a high level can be provided for the first switch circuit 30 connected with the triode, and the first switch circuit 30 is disconnected. When the control device 10 fails, after no pwm signal is sent to the base of the triode, for example, only a high level or low level signal is sent to the base of the triode, the first capacitor C1 cannot be charged, and cannot provide a high level for the first switch circuit 30 connected thereto, so that the first switch circuit 30 is turned on. The first resistor R1 may act as a voltage divider and may also suppress signal disturbances in the circuit.

Through setting up first resistance R1 and first switch tube Q1 of establishing ties in charging circuit, further accurate control first switch circuit 30's break-make, and then guarantee in time to close cooking utensils under the circumstances of controlling means 10 trouble, improve gas stove's safety in utilization effectively. Moreover, the implementation cost of the charging circuit is low.

In some embodiments, as shown in fig. 2, the control system may further include a first diode D1. The negative pole of first diode D1 is connected first terminal, and first terminal is located on the circuit between charging circuit and first electric capacity C1, and the positive pole of first diode D1 is ground.

The diode D1 has unidirectional conductivity. The circuit between the charging circuit and the first capacitor C1 is connected in series with a grounded diode, so that smooth charging of the first capacitor C1 can be ensured, and high-frequency noise and interference signals in the circuit can be effectively restrained.

Alternatively, the grounded diode D1 may be absent from the control system. The circuit between the charging circuit and the first capacitor C1 is no longer grounded. In this way, smooth charging of the first capacitor C1 can also be achieved.

In some embodiments, the first switching circuit 30 may include a second switching tube Q2, a second resistor R2, and a third resistor R3. The control end of the second switch tube Q2 is connected with the first capacitor. The other two ends of the second switching tube Q2 are respectively connected with a power supply and the first end of the second resistor R2. A second end of the second resistor R2 is connected to the solenoid valve 40. The first end of the third resistor R3 is connected with the control end of the second switching tube Q2, and the second end of the third resistor R3 is grounded.

Similar to the first switching transistor Q1, the second switching transistor Q2 may be a semiconductor device such as a transistor or a MOS transistor, and is not limited in any way in the embodiment of the present application. Any semiconductor device that can control the circuit current between the other two ends by the current of the control end is within the protection scope of the present application.

The second resistor R2 may have a value ranging from 5 to 20 ohms (Ω), for example, 5 Ω,10 Ω,15 Ω, 20 Ω, etc., preferably 10 Ω. The second resistor R2 in the above-mentioned resistance value range can ensure that the positive power supply voltage rapidly turns off the solenoid valve 40 when acting on the coil of the solenoid valve 40.

Because of the high conductivity of the ground, large current surges are easily caused when the circuit is directly connected to ground. Causing a safety hazard to the control system. Therefore, in order to protect the safety of the control system, the third resistor R3 added to the ground in the first switch circuit 30 is current-limited. The third resistor R3 has a value in the range of 10 to 100 kiloohms (kΩ), for example, 10kΩ, 30kΩ, 50kΩ,80 kΩ, 100kΩ, etc., preferably 50kΩ.

Referring to fig. 2 again, taking the second switching tube Q2 as an example, the base electrode of the triode is connected with the first capacitor C1, the emitter electrode of the triode is connected with the positive voltage power supply, and the collector electrode of the triode is connected with one end of the second resistor R2. When the first capacitor C1 is in the charging state, the base of the triode is at a high level, so that the triode is in the off state, i.e. the first switch circuit 30 is turned off; when the first capacitor C1 is not in the charging state, the base of the triode is at a low level, so that the triode is in a conducting state, that is, the first switch circuit 30 is turned on, and the positive power voltage acts on the second coil L2 of the electromagnetic valve 40 through the turned-on triode, so that the second coil L2 generates a reverse pulling force greater than that of the third coil L3, and the electromagnetic valve 40 is turned off.

In the above technical solution, the first switching circuit 30 is turned on and off by the first switching tube, so as to automatically control the electromagnetic valve 40 as expected, and the resistor set in the first switching circuit 30 ensures the stability and safety of the circuit. Therefore, when the gas cooker fails, the gas can be timely cut off and fire can be timely turned off.

In some embodiments, the control system may further include a fourth resistor R4, the fourth resistor R4 being connected between the first capacitor C1 and the first switching circuit 30.

In this embodiment, a fourth resistor R4 is provided between the first capacitor C1 and the first switching circuit 30. This can effectively prevent breakdown of the first switching tube Q1 in the case of an excessive circuit current, and can effectively filter out signal interference caused when the voltage of the first capacitor C1 fluctuates. Thereby, the safety of the control system and the accuracy of the control operation are ensured.

In some embodiments, the control system may further include a second control circuit 50 and a drive circuit 60. The first end of the second control circuit 50 is connected with the control device 10, the second end of the second control circuit 50 is connected with the electromagnetic valve 40, and the driving circuit 60 is connected with the third end of the second control circuit 50. The second control circuit 50 is used for controlling the electromagnetic valve 40 to be opened under the driving of the driving circuit 60 when the gas cooker starts to operate.

The second control circuit 50 may be connected to the same port of the solenoid valve 40 as the first switching circuit 30. The second control circuit 50 may control the solenoid valve 40 to open under the driving of the driving circuit 60 controlled by the control device 10. Specifically, after the gas cooker is ignited, the control device 10 sends a start-up instruction to the drive circuit 60, and under the control of the start-up instruction, the drive circuit 60 generates a negative power supply voltage. The negative supply voltage opens the solenoid valve 40 through the second control circuit 50, at which time the gas cooker completes ignition and continues combustion.

In the above technical solution, under the action of the power voltage generated by the driving circuit 60 controlled by the control device 10, the second control circuit 50 opens the electromagnetic valve 40, so that the gas stove is ignited and continuously burnt. Through above-mentioned second control circuit and drive circuit, can keep the solenoid valve of gas cooking utensils open, and then keep gas cooking utensils in operating condition all the time, improved its user experience.

In some embodiments, referring again to fig. 2, the second control circuit 50 may include a fifth resistor R5, a third switching tube Q3, a sixth resistor R6, and a fourth switching tube Q4. The control terminal of the third switching tube Q3 is connected to the control device 10 via a fifth resistor R5. The other two ends of the third switching tube Q3 are respectively connected with a positive voltage power supply and the control end of the fourth switching tube Q4, and the control end of the fourth switching tube Q4 is grounded through a sixth resistor R6. The other two ends of the fourth switching tube Q4 are respectively connected with the electromagnetic valve 40 and the driving circuit 60.

Similarly to the first switching transistor Q1, the third switching transistor Q3 and the fourth switching transistor Q4 may be semiconductor devices such as transistors or MOS transistors, and are not limited in any way in the embodiment of the present application. This is described below as a triode. One end of the fifth resistor R5 is connected to the control device 10. The other end of the fifth resistor R5 is connected to the base of the transistor that is the third switching transistor Q3. An emitter of the transistor as the third switching transistor Q3 is connected to a positive voltage power supply. The collector of the transistor as the third switching transistor Q3 is connected to the base of the transistor as the fourth switching transistor Q4. The base electrode of the triode as the fourth switching tube Q4 is also connected to one end of a sixth resistor R6, and the other end of the sixth resistor R6 is connected to the driving circuit 60. The emitter of the transistor Q4 is also connected to the drive circuit 60, and the collector of the transistor, which is the fourth transistor Q4, is connected to the solenoid valve 40. As shown in fig. 2, the collector of the transistor as the fourth switching transistor Q4 is connected to the same port of the solenoid valve 40 as the first switching circuit 30.

After the ignition of the gas cooker, the control device 10 may output a low level signal to the base of the transistor as the third switching transistor Q3 of the second control circuit 50, and further, the control device 10 may output a pulse width modulation signal to the driving circuit 60 to cause the driving circuit 60 to pull the emitter of the transistor as the fourth switching transistor Q4 to a low level. Thereby, the transistor as the third switching transistor Q3 is turned on, and further the transistor as the fourth switching transistor Q4 is turned on. The low-level voltage output by the driving device acts on the second coil L2 in the electromagnetic valve 40, maintains the opening state of the electromagnetic valve 40, and ensures that the gas pipeline is always in a ventilation state.

The second control circuit 50 is realized by a switch tube and a resistor, and has strong reliability and low cost.

As shown in fig. 2, the second control circuit 50 may further include an eighth resistor R8, a ninth resistor R9, and a tenth resistor R10. Both ends of the eighth resistor R8 are respectively connected to the emitter and the base of the transistor as the third switching transistor Q3, and the eighth resistor R8 is used for determining the switching characteristic of the transistor as the third switching transistor Q3. One end of the ninth resistor R9 is connected to the collector of the transistor as the third switching transistor Q3, and the other end is connected to the base of the transistor as the fourth switching transistor Q4. One end of the tenth resistor R10 is connected to the collector of the fourth switching tube Q4, and the other end is connected to the first switching circuit 30. The ninth resistor R9 and the tenth resistor R10 are used for current limiting. When the current in the circuit is too large, the ninth resistor R9 and the tenth resistor R10 will limit the current to prevent burning out the components of the circuit.

In some embodiments, the driving circuit 60 may include a fifth switching tube Q5, a first branch, a second diode D2, and a seventh resistor R7. The control end of the fifth switching tube Q5 is connected with the control device 10, and the other two ends of the fifth switching tube Q5 are respectively connected with a positive voltage power supply and the cathode of the second diode D2. The anode of the second diode D2 is connected to the second control circuit 50. The first branch comprises a second capacitor C2 and a first inductance L1 connected in series. Both ends of the first branch are respectively connected with the anode of the second diode D2 and the cathode of the second diode D2. Both ends of the seventh resistor R7 are respectively connected with both ends of the second capacitor C2. The end of the second capacitor C2 connected to the first inductor L1 is also grounded.

Similarly to the first switching transistor Q1, the fifth switching transistor Q5 may be a semiconductor device such as a transistor or a MOS transistor, and is not limited in any way in the embodiment of the present application. The fifth switching transistor Q5 is described below as an example. When the gas cooker is ignited, the control device 10 may send a pulse width modulation signal to the base of the triode as the fifth switching tube Q5. The transistor is turned on based on the pulse width modulated signal. The second capacitor C2 may be a polar capacitor. The anode of the second capacitor C2 may be grounded. The negative electrode of the second capacitor C2 may be connected to the second control circuit 50. When the triode is on, the second capacitor C2 charges and generates a negative supply voltage. The negative power supply voltage is applied to the second coil L2 of the solenoid valve 40 through the second control circuit 50 to maintain the solenoid valve 40 in an open state.

In the above technical solution, the second control circuit 50 is provided with a negative voltage through the stable voltage output generated by the second capacitor C2 in the driving circuit 60, so that the on-off fire of the gas stove is accurately controlled, and the stability and safety of the gas stove are further improved.

Optionally, as shown in fig. 2, the driving circuit 60 may further include an eleventh resistor R11. One end of the eleventh resistor R11 is connected to the control device 10, and the other end of the eleventh resistor R11 is connected to the control end of the fifth switching transistor Q5. The eleventh resistor R11 is connected between the control device 10 and the control terminal of the fifth switching tube Q5, and prevents the excessive current flowing through the control terminal of the fifth switching tube Q5, so as to burn out the fifth switching tube Q5, and effectively perform the functions of current limiting and protection.

Optionally, referring again to fig. 2, the control system may further include a third capacitor C3.

One end of the third capacitor C3 is connected to the power supply port of the control device 10, and the other end of the third capacitor C3 is connected to the ground port of the control device 10. The third capacitor C3 may use the stored electric energy to supply power to the control device 10 briefly when the system power supply is not powered. Thereby enabling the control device 10 to complete the necessary processing operations in a short period of time when the system power supply fails to supply power. As the current on the circuit may be noisy, it may cause fluctuations in the supply voltage. By utilizing the characteristic that the capacitor can prevent direct current through alternating current, the third capacitor C3 filters noise, and interference of noise generated by current on the circuit is reduced.

Optionally, referring again to fig. 2, the control system may also include a start-up circuit 70. One end of the start-up circuit 70 is connected to the control device 10, and the other end of the start-up circuit 70 is connected to ground. The start-up circuit 70 is configured to generate an ignition signal and transmit the generated ignition signal to the control device 10 when the gas cooker starts ignition. The start-up circuit 70 may include an ignition switch K1, a twelfth resistor R12, and a fourth capacitor C4. The ignition switch K1 and the twelfth resistor R12 are sequentially connected in series to a circuit between the ground and the control device 10, and two ends of the fourth capacitor C4 are respectively connected with two ends of the twelfth resistor R12. When the ignition switch K1 is closed, for example, by a user turning the firing knob, the start circuit 70 forms a path, at which point an ignition signal is formed. The ignition signal is used to send an ignition command to the control device 10.

In the above solution, the starting circuit 70 is used for starting the gas cooker and forming an ignition signal, and transmitting the ignition signal to the control device 10. By means of the starting circuit 70, ignition of the gas cooker can be controlled with lower calculation cost, and user experience of the gas cooker is improved. And the implementation of the start-up circuit 70 described above ensures a lower economic cost of the control system.

According to another aspect of the utility model there is provided a gas cooker comprising a control system for a gas cooker as described above.

The gas cooker adopting the control system sends a pulse width modulation signal to the first control circuit 20 through the control device 10 to control the first switch circuit 30 to be disconnected, so that the opening state of the electromagnetic valve 40 is maintained, and when the control device 10 fails and cannot send the pulse width modulation signal, the first control circuit 20 controls the first switch circuit 30 to be conducted and forcibly closes the electromagnetic valve 40. The scheme ensures that the gas cooker can automatically and forcedly close the gas valve when the integrated circuit chip in the gas cooker fails, thereby ensuring the use safety of the gas cooker.

Although the illustrative embodiments have been described herein with reference to the accompanying drawings, it is to be understood that the above illustrative embodiments are merely illustrative and are not intended to limit the scope of the present utility model thereto. Various changes and modifications may be made therein by one of ordinary skill in the art without departing from the scope and spirit of the utility model. All such changes and modifications are intended to be included within the scope of the present utility model as set forth in the appended claims.

For ease of description, the term "connected" may be used herein to describe one or more elements or features illustrated in the figures in relation to other elements or features. It will be understood that "connected" may include direct connection or indirect connection via other elements or features, and is intended to include all such situations.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, components, assemblies, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the application described herein may be implemented in sequences other than those illustrated or otherwise described herein.

The present utility model has been illustrated by the above-described embodiments, but it should be understood that the above-described embodiments are for purposes of illustration and description only and are not intended to limit the utility model to the embodiments described. In addition, it will be understood by those skilled in the art that the present utility model is not limited to the embodiments described above, and that many variations and modifications are possible in light of the teachings of the utility model, which variations and modifications are within the scope of the utility model as claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims (10)

1. A control system for a gas cooker, characterized by comprising: the control device, the first control circuit, the first switch circuit and the electromagnetic valve;

the electromagnetic valve is arranged on a gas pipeline of the gas cooker;

The first switch circuit is connected with a power supply and the electromagnetic valve and is used for controlling the connection between the electromagnetic valve and the power supply;

The control device is connected with the first control circuit and is used for sending a pulse width modulation signal to the first control circuit under the condition that the gas cooker works;

The first control circuit is further connected with the first switch circuit, and is used for controlling the first switch circuit to be disconnected based on the pulse width modulation signal so as to maintain the electromagnetic valve to be opened, and controlling the first switch circuit to be connected when the pulse width modulation signal is not received so as to enable the electromagnetic valve to be disconnected.

2. The control system for a gas cooker according to claim 1, wherein the first control circuit includes a charging circuit and a first capacitor connected in series in sequence between the control device and the first switching circuit, the charging circuit being configured to charge the first capacitor based on the pulse width modulation signal to control the first switching circuit to remain off, the first switching circuit being turned on when the pulse width modulation signal is not received.

3. The control system for a gas cooker according to claim 2, wherein the charging circuit comprises a first resistor and a first switching tube, a control end of the first switching tube is connected with the control device, the other two ends of the first switching tube are respectively connected with a first end of the first resistor and the first capacitor, and a second end of the first resistor is used for being connected with a power supply.

4. The control system for a gas cooker according to claim 2 or 3, wherein the first switching circuit comprises a second switching tube, a second resistor and a third resistor, a control end of the second switching tube is connected with the first capacitor, the other two ends of the second switching tube are respectively connected with a power supply and a first end of the second resistor, a second end of the second resistor is connected with the electromagnetic valve, a first end of the third resistor is connected with the control end of the second switching tube, and a second end of the third resistor is grounded.

5. The control system for a gas cooker according to claim 2 or 3, characterized in that it further comprises a fourth resistor connected between the first capacitor and the first switching circuit.

6. The control system for a gas cooker according to claim 2 or 3, characterized in that it further comprises a first diode, the cathode of which is connected to a first end point, which is located on the circuit between the charging circuit and the first capacitor, the anode of which is grounded.

7. A control system for a gas cooker according to any one of claims 1 to 3, characterized in that it further comprises a second control circuit, the first end of which is connected to the control device, the second end of which is connected to the solenoid valve, and a driving circuit, which is connected to the third end of the second control circuit, for controlling the solenoid valve to open when the gas cooker is started to operate, driven by the driving circuit.

8. The control system for a gas cooker according to claim 7, wherein the second control circuit includes a fifth resistor, a third switching tube, a sixth resistor and a fourth switching tube, the control end of the third switching tube is connected to the control device via the fifth resistor, the other two ends of the third switching tube are respectively connected to a positive voltage power supply and the control end of the fourth switching tube, the control end of the fourth switching tube is further connected to the driving circuit via the sixth resistor, and the other two ends of the fourth switching tube are respectively connected to the solenoid valve and the driving circuit.

9. The control system for a gas cooker according to claim 8, wherein the driving circuit comprises a fifth switching tube, a first branch, a second diode and a seventh resistor, wherein the control end of the fifth switching tube is connected with the control device, the other two ends of the fifth switching tube are respectively connected with a positive voltage power supply and the cathode of the second diode, the anode of the second diode is connected with the second control circuit, the first branch comprises a second capacitor and a first inductor which are connected in series, the two ends of the first branch are respectively connected with the anode of the second diode and the cathode of the second diode, the two ends of the seventh resistor are respectively connected with the two ends of the second capacitor, and the end, connected with the first inductor, of the second capacitor is further grounded.

10. A gas hob, characterized in, that the gas hob comprises a control system for a gas hob according to any one of the claims 1 to 9.