Electromagnetic valve constant current driving circuit

Abstract

The utility model relates to a circuit driven by constant current of an electromagnetic valve. The circuit comprises a driving circuit, an electromagnetic valve, a constant current circuit and a controller. Wherein the controller is respectively connected with the driving circuit, the constant current circuit and the stove switch, the driving circuit is respectively connected with the constant current circuit and the electromagnetic valve, and the constant current circuit is connected with the electromagnetic valve; the controller is used for inputting a low level to the driving circuit after detecting that a user turns on the stove switch, and controlling the driving circuit to be switched on; the driving circuit is used for being switched on when the low level is received, supplying power to the constant current circuit and the electromagnetic valve when the driving circuit is switched on, and driving the electromagnetic valve to operate; and the constant current circuit is used for adjusting voltage and stabilizing the driving current of the electromagnetic valve when the electromagnetic valve operates. The driving current of the electromagnetic valve can be stabilized.

Description

TECHNICAL FIELD

[0001] The utility model relates to gas -cooker technical field especially, and it is a kind of circuit of solenoid valve constant current drive. BACKGROUND

[0002] At present, the products of thermocouple gas stove on the market will select thermocouple solenoid valve delay technology for better user experience. In the prior art, the thermocouple gas stove is with resistance current limiting as the technical means for opening the thermocouple solenoid valve. However, the resistance current limiting will change with the fluctuation of battery voltage. When the battery voltage is high, the current is large, causing the solenoid valve to consume power quickly. When the battery voltage is low, the current becomes small, and the solenoid valve cannot be maintained, causing the ignition to fail. SUMMARY

[0003] Therefore, it is necessary to provide a circuit of solenoid valve constant current drive in view of the above technical problems.

[0004] In a first aspect, a circuit of solenoid valve constant current drive is provided, which includes a drive circuit, a solenoid valve, a constant current circuit and a controller. Wherein,

[0005] The controller is connected to the drive circuit, the constant current circuit and the stove switch respectively. The drive circuit is connected to the constant current circuit and the solenoid valve respectively. The constant current circuit is connected to the solenoid valve.

[0006] The controller is configured to input a low level to the drive circuit to control the drive circuit to be turned on after detecting that the user turns on the stove switch.

[0007] The drive circuit is configured to be turned on when receiving a low level, and to supply power to the constant current circuit and the solenoid valve when turned on to drive the solenoid valve to operate.

[0008] The constant current circuit is configured to adjust the voltage and stabilize the driving current of the solenoid valve when the solenoid valve operates.

[0009] As an optional implementation, the constant current circuit includes a first resistor, a second resistor, a MOS tube, a reference chip and a capacitor.

[0010] One end of the first resistor is connected to the V-CHK pin of the controller. The other end of the first resistor is connected to one end of the second resistor, the R pole of the reference chip and the S pole of the MOS tube respectively. The other end of the second resistor is connected to the K pole of the reference chip and the negative pole of the capacitor respectively and grounded. The G pole of the MOS tube is connected to the A pole of the reference chip, the positive pole of the capacitor and the drive circuit respectively. The D pole of the MOS tube is connected to the solenoid valve.

[0011] As an optional implementation, the driving circuit comprises a third resistor, a fourth resistor, a fifth resistor, a triode and a power supply.

[0012] One end of the third resistor is connected to the constant current circuit, and the other end of the third resistor is connected to the collector of the triode, respectively. The emitter of the triode is connected to one end of the fourth resistor and the power supply, respectively. The base of the triode is connected to the other end of the fourth resistor and one end of the fifth resistor, respectively. The other end of the fifth resistor is connected to the L-ON pin of the controller.

[0013] As an optional implementation, the driving current of the electromagnetic valve is the ratio of the reference voltage of the reference chip and the resistance value of the second resistor.

[0014] As an optional implementation, the L-ON pin of the controller is used for starting the delay control of the electromagnetic valve.

[0015] As an optional implementation, the V-CHK pin of the controller is used for collecting the driving current of the electromagnetic valve for sampling.

[0016] As an optional implementation, the cooktop switch comprises a cooktop left switch and a cooktop right switch. The SW-L pin of the controller is connected to the cooktop left switch, and the SW-L pin of the controller is used for detecting whether the cooktop left switch is opened. The SW-R pin of the controller is connected to the cooktop right switch, and the SW-R pin of the controller is used for detecting whether the cooktop right switch is opened.

[0017] As an optional implementation, when the controller detects that the cooktop left switch or the cooktop right switch is opened through the SW-L pin or the SW-R pin, the controller inputs a low level to the driving circuit through the L-ON pin. The driving circuit is turned on, the electromagnetic valve is operated, and the constant current circuit is adjusted.

[0018] The utility model provides a kind of electromagnetic valve constant current drive, the utility model provides the technical scheme of embodiment at least brings following beneficial effects: the controller is connected the driving circuit, the constant current circuit and stove switch respectively, the driving circuit is connected the constant current circuit and the electromagnetic valve respectively, the constant current circuit is connected the electromagnetic valve;The controller is used to detect that user opens the stove switch, low level is input to the driving circuit, controls the driving circuit conduction;The driving circuit is used to receive low level and conduction, and when conduction, the constant current circuit and the electromagnetic valve are powered, drive the electromagnetic valve to operate;The constant current circuit is used to carry out voltage regulation when the electromagnetic valve operates, stabilize the drive current of the electromagnetic valve.This way, through driving circuit and constant current circuit, the electromagnetic valve conduction is driven, and the drive current of electromagnetic valve is stabilized.Electromagnetic valve is avoided with the fluctuation of battery voltage and changes.Through hardware circuit building and software sampling identification, realize thermocouple electromagnetic valve constant current drive and circuit detection.Realize the advantages such as low cost, safe and reliable, energy saving and consumption reduction, satisfy the effect that thermocouple gas stove battery prolongs use.Also can judge electromagnetic valve abnormal alarm through the drive current of electromagnetic valve, realize the detection and abnormal alarm of electromagnetic valve quickly.

[0019] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creating any creative labor.

[0021] Figure 1 The structure diagram of the circuit of the electromagnetic valve constant current drive provided by the embodiment of the utility model is shown. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical scheme and advantages of the utility model more clear, the utility model will be further described in detail below combined with drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, and are not used to limit the utility model.

[0023] Figure 1 The structure diagram of the circuit of the electromagnetic valve constant current drive provided by the embodiment of the utility model is shown. Figure 1 As shown in the figure, the circuit of the electromagnetic valve constant current drive includes driving circuit 101, electromagnetic valve, constant current circuit 102 and controller MCU U1.

[0024] The controller MCU U1 is connected with the driving circuit 101, the constant current circuit 102 and the stove switch respectively. The driving circuit 101 is connected with the constant current circuit 102 and the electromagnetic valve respectively. The constant current circuit 102 is connected with the electromagnetic valve.

[0025] The controller MCU U1 is used to input low level to the driving circuit 101 after detecting that the user opens the stove switch, and control the driving circuit 102 to be turned on.

[0026] The driving circuit 101 is used to be turned on when receiving low level, and supply power to the constant current circuit 102 and the electromagnetic valve when being turned on, and drive the electromagnetic valve to run.

[0027] The constant current circuit 101 is used to adjust voltage and stabilize the driving current of the electromagnetic valve when the electromagnetic valve runs.

[0028] As an optional implementation, the constant current circuit 102 includes a first resistor R1, a second resistor R2, a MOS tube Q2, a reference chip U2 and a capacitor C1.

[0029] The V-CHK pin of the controller MCU U1 is connected with one end of the first resistor R1. The other end of the first resistor R1 is connected with one end of the second resistor R2, the R pole of the reference chip U2 and the S pole of the MOS tube Q2 respectively. The other end of the second resistor R2 is connected with the K pole of the reference chip U2 and the negative pole of the capacitor C1 and grounded respectively. The G pole of the MOS tube Q2 is connected with the A pole of the reference chip U2, the positive pole of the capacitor C1 and the driving circuit 101 respectively. The D pole of the MOS tube Q2 is connected with the electromagnetic valve. The capacitor C1 plays a role of loop compensation, and the stability of the driving current of the electromagnetic valve can be affected by adjusting the capacitance of the capacitor C1.

[0030] As an optional implementation, the driving circuit 101 includes a third resistor R3, a fourth resistor R4, a fifth resistor R5, a triode Q1 and a power supply 3V.

[0031] One end of the third resistor R3 is connected with the constant current circuit 102. The other end of the third resistor R3 is connected with the collector of the triode Q1 respectively. The emitter of the triode Q1 is connected with one end of the fourth resistor R4 and the power supply 3V respectively. The base of the triode Q1 is connected with the other end of the fourth resistor R4 and one end of the fifth resistor R5 respectively. The other end of the fifth resistor R5 is connected with the L-ON pin of the controller MCU U1. The fourth resistor R4 is the bias resistor of the triode Q1, which ensures that the triode Q1 keeps in the off state when not driven by the controller MCU U1. The controller MCU U1 drives the triode Q1 to be turned on and turned off through the fifth resistor R5.

[0032] As an optional embodiment, the drive current of the electromagnetic valve is the ratio of the reference voltage of the reference chip U2 and the resistance value of the second resistor R2.

[0033] As an optional embodiment, the L-ON pin of the controller MCU U1 is used for the delay control of the opening of the electromagnetic valve.

[0034] As an optional embodiment, the V-CHK pin of the controller MCU U1 is used for collecting the drive current of the electromagnetic valve for sampling.

[0035] As an optional embodiment, the stove switch includes a stove left switch and a stove right switch, the SW-L pin of the controller MCU U1 is connected to the stove left switch, and the SW-R pin of the controller MCU U1 is connected to the stove right switch. The SW-L pin of the controller MCU U1 is used for detecting whether the stove left switch is opened, and the SW-R pin of the controller MCU U1 is used for detecting whether the stove right switch is opened.

[0036] As an optional embodiment, when the controller MCU U1 detects that the stove left switch or the stove right switch is opened through the SW-L pin or the SW-R pin, the controller MCU U1 inputs a low level to the drive circuit 101 through the L-ON pin, the drive circuit 101 is turned on, the electromagnetic valve is operated, and the constant current circuit 101 is adjusted.

[0037] In this way, when the controller MCU U1 detects that the stove left switch or the stove right switch is opened through the SW-L pin or the SW-R pin, the controller MCU U1 inputs a low level to the drive circuit 101 through the L-ON pin. At this time, the transistor Q1 in the drive circuit 101 is turned on, the drive circuit 101 is turned on, the electromagnetic valve is operated, and the constant current circuit 102 is turned on. The reference chip U2 in the constant current circuit 102 plays a role of voltage regulation. The reference chip U2 can be selected as a 1.25V reference chip. In this way, the reference chip U2 can make the voltage drop of the second resistor R2 stable to 1.25V. The resistance value of the second resistor R2 is 10Ω, so the electromagnetic valve loop current I=1.25V / 10Ω=125mA. The drive current of the electromagnetic valve is stable at 125mA and is not affected by external voltage. Further, when the controller MCU U1 drives the electromagnetic valve to operate, the first resistor R1 is connected to the V-CHK pin in series, and the voltage drop of the second resistor R2 is continuously detected. If the voltage drop of the second resistor R2 does not meet the design voltage, it is judged that the electromagnetic valve is abnormal and an alarm is given. In this way, loop detection and abnormal alarm can be quickly realized.

[0038] The utility model embodiment provides a kind of circuit of solenoid valve constant current drive, by drive circuit and constant current circuit, solenoid valve is turned on, and the drive current of solenoid valve is stabilized.It avoids the change of solenoid valve along with the fluctuation of battery voltage.By hardware circuit construction, and software sampling identification, realize thermocouple solenoid valve constant current drive and circuit detection.Realize the advantages of low cost, safe and reliable, energy saving, meet the effect of battery extension of thermocouple gas stove.It can also be judged by the drive current of solenoid valve, solenoid valve abnormal alarm, quickly realize the detection and abnormal alarm of solenoid valve.

[0039] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by a computer program instructing related hardware, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the above-mentioned embodiments. Any reference to memory, storage, databases, or other media in the embodiments provided by the present application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. As an illustration but not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

[0040] It should be noted that, in this paper, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the element defined by the statement "including a" does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0041] It also needs to be explained that the user information (including but not limited to user equipment information, user personal information, etc.) and data (including but not limited to data for display, analyzed data, etc.) involved in the utility model are all information and data authorized by the user or authorized by all parties.

[0042] Each embodiment in the specification is described in a related manner, and the same and similar parts between each embodiment can be referred to each other, and each embodiment focuses on the difference from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the related parts can refer to the part of the method embodiment.

[0043] The technical features of the above embodiments can be combined arbitrarily, in order to make the description simple, not all possible combinations of the technical features in the above embodiments are described, however, as long as the combination of the technical features does not exist contradictory, it should be considered as the scope of the specification.

[0044] The above-described embodiments only express several implementation manners of the utility model, the description is more specific and detailed, but it should not be understood as the limitation of the scope of the invention patent. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the utility model, a number of variations and improvements can be made, which belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent should be subject to the appended claims.

Claims

1. A circuit for constant current driving of a solenoid valve, characterized by comprising: The circuit comprises a driving circuit, a solenoid valve, a constant current circuit and a controller. The controller is connected with the driving circuit, the constant current circuit and a stove switch respectively, the driving circuit is connected with the constant current circuit and the solenoid valve respectively, and the constant current circuit is connected with the solenoid valve. The controller inputs a low level to the driving circuit to control the driving circuit to be turned on after detecting that the user opens the stove switch. The driving circuit is turned on when receiving the low level, and supplies power to the constant current circuit and the solenoid valve to drive the solenoid valve to run when being turned on. The constant current circuit adjusts voltage to stabilize the driving current of the solenoid valve when the solenoid valve runs.

2. The circuit of claim 1, wherein The constant current circuit comprises a first resistor, a second resistor, a MOS tube, a reference chip and a capacitor. One end of the first resistor is connected with a V-CHK pin of the controller, the other end of the first resistor is connected with one end of the second resistor, a R pole of the reference chip and a S pole of the MOS tube respectively, the other end of the second resistor is connected with a K pole of the reference chip and a negative pole of the capacitor respectively and grounded, a G pole of the MOS tube is connected with an A pole of the reference chip, a positive pole of the capacitor and the driving circuit respectively, and a D pole of the MOS tube is connected with the solenoid valve.

3. The circuit of claim 1, wherein The driving circuit comprises a third resistor, a fourth resistor, a fifth resistor, a triode and a power supply. One end of the third resistor is connected with the constant current circuit, the other end of the third resistor is connected with a collector of the triode respectively, an emitter of the triode is connected with one end of the fourth resistor and the power supply respectively, a base of the triode is connected with the other end of the fourth resistor and one end of the fifth resistor respectively, and the other end of the fifth resistor is connected with an L-ON pin of the controller.

4. The circuit of claim 2, wherein The driving current of the solenoid valve is a ratio of a reference voltage of the reference chip and a resistance value of the second resistor.

5. The circuit of claim 1, wherein The L-ON pin of the controller is used for delay control of the solenoid valve.

6. The circuit of claim 1, wherein The V-CHK pin of the controller is used for collecting the driving current of the solenoid valve for sampling.

7. The circuit of claim 5, wherein The stove switch comprises a stove left switch and a stove right switch, a SW-L pin of the controller is connected with the stove left switch, and the SW-L pin of the controller is used for detecting whether the stove left switch is opened or not; a SW-R pin of the controller is connected with the stove right switch, and the SW-R pin of the controller is used for detecting whether the stove right switch is opened or not.

8. The circuit of claim 7, wherein, When the controller detects that the stove left switch or the stove right switch is opened through the SW-L pin or the SW-R pin, the controller inputs a low level to the driving circuit through the L-ON pin, the driving circuit is turned on, the solenoid valve runs, and the constant current circuit adjusts constant current.

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