Gear position detection circuit and accurate gear position judgment circuit and gas stove using the same

Abstract

The present invention discloses a gear detection circuit and a precise gear judgment circuit and a gas stove using the same, wherein the gear detection circuit includes a mechanical switch module and a resistor network module, the mechanical switch module is electrically connected to the resistor network module, the mechanical switch module is used for contacting and disconnecting the gear, and the resistor network module is used for outputting a corresponding gear voltage for gear detection according to the contact and disconnection of the gear of the mechanical switch module. A gear detection circuit of the present invention first realizes the contact and disconnection of the gear through the mechanical switch module, and then outputs a corresponding gear voltage for gear detection according to the contact and disconnection of the gear of the mechanical switch module through the resistor network module, thereby abandoning the control mode of the mechanical sliding rheostat, eliminating the uncertainty of the voltage during the sliding process of the knob gear, reducing abnormal problems such as gear jumping and hanging, achieving the advantages of low cost, high accuracy, high efficiency, etc., and improving the reliability of the gear detection circuit of the gas stove.

Description

Technical Field

[0001] The present invention belongs to the technical field of gas stoves, and in particular relates to a gear position detection circuit and a precise gear position judgment circuit and a gas stove using the same. Background Art

[0002] In the market, for gear position detection of gas stoves, etc., mechanical sliding rheostats are generally used to determine the gear position voltage.

[0003] However, the existing mechanical sliding rheostat has the disadvantages of high hardware cost, large voltage fluctuation during sliding, and complex structure. At the same time, during the sliding process of the knob gear controlled by the mechanical sliding rheostat, due to mechanical friction, contact oxidation, position deviation and other reasons, it is easy to cause voltage uncertainty, gear jumping, hanging and other abnormal problems. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a gear detection circuit, which abandons the control method of the mechanical sliding rheostat, achieves the advantages of low cost, high accuracy and high efficiency, and improves the reliability of the gear detection circuit of the gas stove.

[0005] Another object of the present invention is to provide a precise gear position determination circuit.

[0006] Another object of the present invention is to provide a gas stove.

[0007] The technical solution adopted by the present invention is:

[0008] A gear position detection circuit includes a mechanical switch module and a resistor network module. The mechanical switch module is electrically connected to the resistor network module. The mechanical switch module is used for contacting and disconnecting the gear position. The resistor network module is used to output a corresponding gear position voltage for gear position detection according to the contact and disconnection of the gear position of the mechanical switch module.

[0009] Preferably, the resistor network module includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6 and an operational amplifier L1, a reference voltage UREF is connected in parallel to one end of the first resistor R1 and one end of the second resistor R2, the other end of the second resistor R2 is connected in parallel to one end of the third resistor R3 and one end of the fourth resistor R4, the other end of the fourth resistor R4 is connected to the fifth pin of the operational amplifier L1, the sixth pin of the operational amplifier L1 is connected in series with the sixth resistor R6 and then connected to the seventh pin of the operational amplifier L1 to form an output voltage Vout, and the fifth pin of the operational amplifier L1 is connected in series with the fifth resistor R5 and then grounded.

[0010] Preferably, the mechanical switch module includes a first switch S1 and a second switch S2, the third pin of the first switch S1 is connected to the third pin of the second switch S2, the second pin of the first switch S1 is connected to the other end of the first resistor R1, the second pin of the second switch S2 is connected to the other end of the third resistor R3, and the first pin of the first switch S1 and the first pin of the second switch S are both connected to the fifth pin of the operational amplifier L1.

[0011] Preferably, the resistance of the fourth resistor R4 is equal to the resistance of the third resistor R3, the resistance of the third resistor R3 is equal to the resistance of the first resistor R1, and the resistance of the first resistor R1 is equal to twice the resistance of the second resistor R2.

[0012] Preferably, the first switch S1 and the second switch S2 are both single-pole double-throw switches.

[0013] Another technical solution of the present invention is achieved in this way:

[0014] A precise gear position judgment circuit comprises the gear position detection circuit and a hysteresis comparator module, wherein the hysteresis comparator module is electrically connected to the gear position detection circuit and is used to accurately judge the gear position according to the gear position voltage output by the gear position detection circuit.

[0015] Preferably, the hysteresis comparator module includes a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a third switch S3, a fourth switch S4 and a hysteresis comparator L2, a sixth pin of the hysteresis comparator L2 is connected in series with the seventh resistor R7 and then connected to the resistor network module, a fifth pin of the hysteresis comparator L2 is connected in parallel with one end of the eighth resistor R8, one end of the ninth resistor R9, one end of the tenth resistor R10 and one end of the eleventh resistor R11, the other end of the eighth resistor R8 is connected in series with the third switch S3, the other end of the ninth resistor R9 is connected in series with the fourth switch S4 and the other end of the tenth resistor R10 are all connected to the adjustable voltage VR, and the other end of the eleventh resistor R11 is connected to the seventh pin of the hysteresis comparator L2 to form a voltage U0.

[0016] Preferably, the third switch S3 and the fourth switch S4 are both single-pole single-throw switches.

[0017] Another technical solution of the present invention is achieved in this way:

[0018] A gas stove comprises the gear position detection circuit or the precise gear position judgment circuit.

[0019] Compared with the prior art, the gear detection circuit of the present invention first realizes the contact and disconnection of the gear through a mechanical switch module, and then performs gear detection by outputting the corresponding gear voltage through a resistor network module according to the contact and disconnection of the gear of the mechanical switch module, thereby abandoning the control method of a mechanical sliding rheostat, eliminating the voltage uncertainty caused by mechanical friction, contact oxidation, position deviation and other reasons during the sliding process of the knob gear, reducing abnormal problems such as gear jumping and hanging, achieving the advantages of low cost, high accuracy and high efficiency, and improving the reliability of gear detection circuits such as gas stoves. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a circuit diagram of a gear position detection circuit provided in Example 1 of the present invention;

[0021] Figure 2 is a circuit diagram of a precise gear position determination circuit provided in Embodiment 2 of the present invention;

[0022] Figure 3 This is a hysteresis comparison area diagram of the output voltage Vout of a precise gear position judgment circuit following the gear position change provided by Example 2 of the present invention.

[0023] Description of Reference Numerals

[0024] 1- Mechanical switch module, 2- Resistor network module, 3- Hysteresis comparator module. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0026] Example 1

[0027] An embodiment of the present invention provides a gear position detection circuit, such as Figure 1 As shown, it includes a mechanical switch module 1 and a resistor network module 2, the mechanical switch module 1 is electrically connected to the resistor network module 2, the mechanical switch module 1 is used for contacting and disconnecting the gear position, and the resistor network module 2 is used to detect the gear position according to the contact and disconnection of the gear position of the mechanical switch module 1 and the corresponding gear position voltage output.

[0028] In this way, the gear position is firstly contacted and disconnected through the mechanical switch module 1, and then the gear position is detected through the resistance network module 2 according to the gear position voltage corresponding to the contact and disconnection output of the mechanical switch module gear position 1, thereby abandoning the control method of the mechanical sliding rheostat, eliminating the voltage uncertainty caused by mechanical friction, contact oxidation, position deviation and other reasons during the sliding process of the knob gear, reducing abnormal problems such as gear jumping and hanging, achieving the advantages of low cost, high accuracy and high efficiency, and improving the reliability of the gear detection circuit of gas stoves.

[0029] The mechanical switch module 1 includes a first switch S1 and a second switch S2, wherein the third pin of the first switch S1 is connected to the third pin of the second switch S2, the second pin of the first switch S1 is connected to the other end of the first resistor R1, the second pin of the second switch S2 is connected to the other end of the third resistor R3, and the first pin of the first switch S1 and the first pin of the second switch S2 are both connected to the fifth pin of the operational amplifier L1. The first switch S1 and the second switch S2 are both single-pole double-throw switches.

[0030] In this way, the first switch S1 and the second switch S2 are contact switches of the 1st to 2nd gear of the stove knob;

[0031] S1. The gear position is connected and disconnected through the mechanical switch module. The specific steps are as follows:

[0032] S11, when the knob is at gear 0, the first switch S1 and the second switch S2 are both in the initial state and both contact the third pin;

[0033] S12, when the knob is turned from gear 0 to gear 1; the first switch S1 contacts the first pin from the third pin, and the contact switch state of the second switch S2 remains unchanged;

[0034] S13, when the knob is turned to gear 2, the second switch S2 contacts the first pin from the third pin, and gear 1 maintains the state of S12 unchanged;

[0035] S14: When the knob is turned back from position 2 to position 1, the second switch S2 contacts the third pin from the first pin, and position 1 remains in the state of S12 unchanged;

[0036] S15, when the knob is turned back from position 1 to position 0, the first switch S1 contacts the third pin from the first pin, and the position 2 remains unchanged in the state of S14;

[0037] The five steps S11 to S15 are repeated in this way to achieve the gear switching of the stove knob switch.

[0038] The resistor network module 2 includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6 and an operational amplifier L1, a reference voltage UREF is connected in parallel to one end of the first resistor R1 and one end of the second resistor R2, the other end of the second resistor R2 is connected in parallel to one end of the third resistor R3 and one end of the fourth resistor R4, the other end of the fourth resistor R4 is connected to the fifth pin of the operational amplifier L1, the sixth pin of the operational amplifier L1 is connected in series to the sixth resistor R6 and then connected to the seventh pin of the operational amplifier L1 to form an output voltage Vout, and the fifth pin of the operational amplifier L1 is connected in series to the fifth resistor R5 and then grounded. The resistance value of the fourth resistor R4 is equal to the resistance value of the third resistor R3, the resistance value of the third resistor R3 is equal to the resistance value of the first resistor R1, and the resistance value of the first resistor R1 is equal to twice the resistance value of the second resistor R2.

[0039] In this way, S2 realizes the differentiation and output of the gear voltage through the resistor network module 2, and provides the steady-state working voltage and positive voltage range output Vout of the in-phase terminal of the operational amplifier L1 through the fifth resistor R5 (bias resistor).

[0040] According to the principle of virtual short and virtual break,

[0041] VN_IC1B=VP_IC1B=UREF*R5 / (((R4 / / R3)+R2) / / R1)), no matter what contact state the first switch S1 and the second switch S2 are in, the current flowing through R4 and R3, R1 and R2 are equal; and R4=R3=2*R2=R1, the current distributed by this resistor network is:

[0042] IR1=IR2=2*IR4=2*IR3=UREF / R.

[0043] The specific steps are:

[0044] S21, refer to S11, when the knob is at gear 0, since the first switch S1 and the second switch S2 are both in contact with the third pin, the voltage at the in-phase input terminal (fifth pin) of the operational amplifier L1 is VP_IC1B=UREF*R5 / (((R4 / / R3)+R2) / / R1)); according to the virtual break principle, the voltage at the inverting input terminal (sixth pin) of the operational amplifier L1 is VN_IC1B=VP_IC1B; according to the virtual short principle, no current flows through the sixth resistor R6 (negative feedback resistor) at this time, so the output voltage of the operational amplifier L1 is: Vout=VN_IC1B=VP_IC1B;

[0045] S22, refer to S12. When the knob is at gear 1, since the first switch S1 contacts the first pin and the second switch S2 contacts the third pin, the current of the sixth resistor R6 (negative feedback resistor) is I_Rf = (UREF-VP_IC1B) / R1 = I_R1, so the output voltage of the op amp is:

[0046] Vout=VN_IC1B-I_Rf*Rf=VN_IC1B-I_R1*R1;

[0047] S23, refer to S13 when the knob is at gear 2; since the first switch S1 and the second switch S2 are both in contact with the first pin, the current of the sixth resistor R6 (negative feedback resistor) is I_Rf=2*I_R1, so the output voltage of the op amp Vout=VN_IC1B-I_Rf*Rf=VN_IC1B-2*I_R1*R1;

[0048] S24, repeating steps S21-S23 again to achieve the output of the range knob position voltage:

[0049] 0 gear: UREF;

[0050] 1st gear----Vout=VN_IC1B-I_Rf*Rf=VN_IC1B-I_R1*R1;

[0051] Level 2----Vout=VN_IC1B-I_Rf*Rf=VN_IC1B-2*I_R1*R1;

[0052] Combining the above steps, the voltage of the stove knob gear position changes between UREF and VN_IC1B-2*I_R*R1, thereby identifying the gear position change.

[0053] The gear detection circuit of the present invention first realizes the contact and disconnection of the gear through a mechanical switch module, and then performs gear detection through a resistor network module according to the gear contact and disconnection output corresponding to the gear voltage of the mechanical switch module, thereby abandoning the control method of the mechanical sliding rheostat, eliminating the voltage uncertainty caused by mechanical friction, contact oxidation, position deviation and other reasons during the sliding process of the knob gear, reducing abnormal problems such as gear jumping and hanging, achieving the advantages of low cost, high accuracy and high efficiency, and improving the reliability of the gear detection circuit of the gas stove.

[0054] Example 2

[0055] like Figure 2 As shown, embodiment 2 of the present invention provides a precise gear position judgment circuit, which includes the gear position detection circuit and a hysteresis comparator module 3. The hysteresis comparator module 3 is electrically connected to the gear position detection circuit, and the hysteresis comparator module 3 is used to accurately judge the gear position according to the gear position voltage output by the gear position detection circuit.

[0056] In this way, the gear position is accurately determined according to the gear position voltage output by the gear position detection circuit through the hysteresis comparator module 3, thereby improving the gear position determination accuracy.

[0057] The hysteresis comparator module 3 includes a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a third switch S3, a fourth switch S4 and a hysteresis comparator L2, the sixth pin of the hysteresis comparator L2 is connected in series with the seventh resistor R7 and then connected to the resistor network module 2, the fifth pin of the hysteresis comparator L2 is connected in parallel with one end of the eighth resistor R8, one end of the ninth resistor R9, one end of the tenth resistor R10 and one end of the eleventh resistor R11, the other end of the eighth resistor R8 is connected in series with the third switch S3, the other end of the ninth resistor R9 is connected in series with the fourth switch S4 and the other end of the tenth resistor R10 are all connected to the adjustable voltage VR, the other end of the eleventh resistor R11 is connected to the seventh pin of the hysteresis comparator L2 to form a voltage U0, the power pin of the hysteresis comparator L2 is connected to the voltage VCC, the ground pin of the hysteresis comparator L2 is grounded, wherein the third switch S3 and the fourth switch S4 are both single-pole single-throw switches.

[0058] In this way, S3, through the hysteresis comparator module 3, the gear position DA is converted and outputted into the mutually exclusive judgment area level, such as Figure 3 As shown, the specific steps include:

[0059] S31. According to S11, when the knob is at gear 0, the first switch S1 and the second switch S2 are both in contact with the third pin in the initial state, and the third switch S3 and the fourth switch S4 are disconnected. According to S24, when the gear is gear 0, UREF>(VCC-VR)*R11 / (R10+R11), U0=0, and it is judged to be gear 0;

[0060] S32, according to S12, when the knob is in gear 1, the first switch S1 contacts the first pin from the third pin, and the gear 2 contact switch state remains unchanged, and the third switch S3 is closed, and the fourth switch S4 is disconnected. According to S24, when the gear is in gear 1,

[0061] When Vout>(VCC-VR)*R11 / ((R10 / / R8)+R11), U0=0, which is judged as level 1;

[0062] S33, according to S13, when the knob is in gear 2, the second switch S2 contacts the first pin from the third pin, and gear 1 maintains the state of S12 unchanged, and the third switch S3 and the fourth switch S4 are closed. According to S24, when the gear is in gear 2, Vout>(VCC-VR)*R11 / ((R10 / / R8 / / R9)+R11), U0=0, and it is judged to be gear 2;

[0063] S34. According to S31-S33, Vout changes with the gear position and three mutually exclusive hysteresis comparison areas appear, thereby determining the switch position as 0, 1, and 2 gears.

[0064] The precise gear position judgment circuit of the present invention first realizes the contact and disconnection of the gear position through a mechanical switch module, and then performs gear position detection through a resistor network module according to the contact and disconnection of the gear position of the mechanical switch module, thereby abandoning the control method of the mechanical sliding rheostat, eliminating the voltage uncertainty caused by mechanical friction, contact oxidation, position deviation and other reasons during the sliding process of the knob gear, reducing abnormal problems such as gear jumping and hanging, achieving the advantages of low cost, high accuracy and high efficiency, improving the reliability of gear position detection circuits such as gas stoves, and achieving higher-precision gear position judgment. At the same time, because the precise gear position judgment circuit directly performs specific gear position judgment through changes in electrical level, the gear position detection accuracy is higher.

[0065] Example 3

[0066] Embodiment 3 of the present invention provides a gas stove, which includes the gear position detection circuit or the precise gear position judgment circuit.

[0067] The gas stove of the present invention first realizes the contact and disconnection of the gear position through a mechanical switch module, and then performs gear position detection through a resistor network module according to the contact and disconnection of the gear position of the mechanical switch module and the output corresponding gear position voltage, thereby abandoning the control method of the mechanical sliding rheostat, eliminating the voltage uncertainty caused by mechanical friction, contact oxidation, position deviation and the like during the sliding process of the knob gear position, reducing abnormal problems such as gear jumping and hanging, achieving the advantages of low cost, high accuracy, high efficiency and the like, and improving the reliability of the gear position detection circuit of the gas stove and the like.

[0068] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A gear position detection circuit, characterized in that: The invention comprises a mechanical switch module (1) and a resistor network module (2), wherein the mechanical switch module (1) is electrically connected to the resistor network module (2), the mechanical switch module (1) is used for contacting and disconnecting the gear position, and the resistor network module (2) is used for outputting a corresponding gear position voltage to detect the gear position according to the contacting and disconnecting of the gear position of the mechanical switch module (1); the resistor network module (2) comprises a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6 and an operational amplifier L1, a reference voltage UREF is connected in parallel to one end of the first resistor R1 and one end of the second resistor R2, the other end of the second resistor R2 is connected in parallel to one end of the third resistor R3 and one end of the fourth resistor R4, the other end of the fourth resistor R4 is connected to the fifth pin of the operational amplifier L1, and the sixth pin of the operational amplifier L1 is connected in series with the sixth resistor R6 and then connected to the operational amplifier L1. The output voltage Vout is formed after the seventh pin of the operational amplifier L1, and the fifth pin of the operational amplifier L1 is connected in series with the fifth resistor R5 and then grounded; the model of the operational amplifier L1 is LM2904; the resistance value of the fourth resistor R4 is equal to the resistance value of the third resistor R3, the resistance value of the third resistor R3 is equal to the resistance value of the first resistor R1, and the resistance value of the first resistor R1 is equal to twice the resistance value of the second resistor R2; the mechanical switch module (1) comprises a first switch S1 and a second switch S2, the third pin of the first switch S1 is connected to the third pin of the second switch S2 and the other end of the fourth resistor R4, the second pin of the first switch S1 is connected to the other end of the first resistor R1, the second pin of the second switch S2 is connected to the other end of the third resistor R3, and the first pin of the first switch S1 and the first pin of the second switch S2 are both connected to the sixth pin of the operational amplifier L1.

2. The gear position detection circuit according to claim 1, characterized in that: The first switch S1 and the second switch S2 are both single-pole double-throw switches.

3. A precise gear position judgment circuit, characterized in that: It comprises the gear position detection circuit and a hysteresis comparator module (3) as claimed in claim 1 or 2, wherein the hysteresis comparator module (3) is electrically connected to the gear position detection circuit, and the hysteresis comparator module (3) is used to accurately determine the gear position according to the gear position voltage output by the gear position detection circuit; The hysteresis comparator module (3) comprises a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a third switch S3, a fourth switch S4 and a hysteresis comparator L2, wherein the model of the hysteresis comparator L2 is ML353; the sixth pin of the hysteresis comparator L2 is connected in series with the seventh resistor R7 and then connected to the resistor network module (2); the fifth pin of the hysteresis comparator L2 is connected in parallel with one end of the eighth resistor R8, one end of the ninth resistor R9, one end of the tenth resistor R10 and one end of the eleventh resistor R11; the other end of the eighth resistor R8 is connected in series with the third switch S3, the other end of the ninth resistor R9 is connected in series with the fourth switch S4 and the other end of the tenth resistor R10 are all connected to an adjustable voltage VR; the other end of the eleventh resistor R11 is connected to the seventh pin of the hysteresis comparator L2 and forms a voltage U0; by controlling the first switch S1, the second switch S2 and the third switch S3 and the fourth switch S4 to cooperate with each other in on and off, accurate judgment of the voltages of different gears is achieved.

4. The precise gear position determination circuit according to claim 3, characterized in that: The third switch S3 and the fourth switch S4 are both single-pole single-throw switches.

5. A gas stove, characterized in that: It includes the gear detection circuit described in claim 1 or 2 or the precise gear judgment circuit described in claim 3 or 4.

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