Method for setting air pressure threshold of electronic air pressure switch, switch, and electronic equipment

Abstract

The present invention provides a method for setting an air pressure threshold of an electronic air pressure switch. By setting a personalized capacitance change threshold module inside the electronic air pressure switch, the production test equipment of the electronic air pressure switch first records the equivalent capacitance value of the electronic air pressure switch when no air pressure is loaded through the personalized capacitance change threshold module according to the process protocol, and then records the equivalent capacitance value of the electronic air pressure switch when the target air pressure is loaded, and then calculates the difference in the equivalent capacitance values. Finally, the difference in the capacitance values ​​is set as the personalized capacitance change threshold in each corresponding electronic air pressure switch, and cooperates with the chip trigger to execute the operation; the present invention also provides a corresponding electronic air pressure switch, an electronic device and a method of using the same. The present invention can achieve the purpose of greatly improving the consistency of the air pressure threshold in mass production; at the same time, it can reduce the development cycle and development cost when the target air pressure value needs to be changed.

Description

Technical Field

[0001] The present invention belongs to the technical field of electronic circuits, and in particular relates to a method for setting an air pressure threshold of an electronic air pressure switch, a switch, and an electronic device. Background Art

[0002] Electronic air pressure switches monitor changes in ambient air pressure and trigger an execution action when the air pressure change reaches a certain threshold. The electronic air pressure switch consists of an air pressure sensor and a control circuit. The air pressure sensor often uses a pressure-capacitive sensor, which has the characteristic that when the air pressure changes, its equivalent capacitance changes accordingly. The control circuit often uses a dedicated integrated circuit, or chip.

[0003] The equivalent capacitance of the pressure sensor is specifically composed of a fixed plate and a diaphragm that deforms when the air pressure changes. Both the plate and the diaphragm are conductors with a certain distance between them, so a capacitor is formed. When the ambient air pressure changes, the diaphragm deforms, the distance between it and the plate changes, and its equivalent capacitance changes accordingly. The chip in the electronic pressure switch is responsible for determining whether to trigger an execution operation by monitoring the capacitance change threshold of the equivalent capacitance of the pressure sensor. The chip in the existing electronic pressure switch first sets a fixed capacitance change threshold internally, for example, the fixed capacitance change threshold is 3%. When the chip in the electronic pressure switch detects that the equivalent capacitance change exceeds 3%, the power switch is turned on and the execution operation is triggered.

[0004] Since the air pressure sensor is assembled from multiple parts, there are assembly tolerances and differences in the parts themselves, such as the thickness and elasticity of the diaphragm, which will cause different electronic air pressure switches to have different pressure thresholds when they reach a fixed capacitance change threshold, and poor consistency during mass production; for example, if a batch of electronic air pressure switches with a target air pressure threshold of 150 Pa need to be produced, the actual air pressure threshold may be lower than 100 Pa or higher than 200 Pa due to assembly tolerance and other issues; poor consistency will lead to inconsistent user experience, and will also lead to loss of production yield, increasing the production cost of the electronic air pressure switch; for electronic air pressure switches that require a target air pressure threshold of 150 Pa, if the acceptable air pressure threshold range is 100 Pa to 200 Pa for good products, then those below 100 Pa or above 200 Pa are defective products, resulting in yield loss.

[0005] In the current production process, if the target pressure threshold of an electronic air pressure switch is changed from 150 Pa to 180 Pa, the design of the air pressure sensor needs to be modified, and the parts need to be re-molded and assembled, or the fixed capacitance change threshold needs to be changed, for example, from the original 3% to 3.6%. Either change requires re-modification and debugging of the production line, increasing the development cycle and development costs. Summary of the invention

[0006] In view of this, the purpose of the present invention is to propose an electronic air pressure switch and a method for setting an air pressure threshold thereof, and to set a corresponding capacitance change threshold according to the difference in equivalent capacitance of each electronic air pressure switch. The inconsistency caused by the difference in components mentioned in the background technology will be compensated by the personalized capacitance change threshold, so as to achieve the purpose of greatly improving the consistency of the air pressure threshold in mass production; how each chip of the electronic air pressure switch obtains the characteristics of the air pressure sensor assembled with it and personalizes the air pressure threshold of each electronic air pressure switch is the key technical problem solved by the present invention; the present invention also solves the shortcoming of the prior art that it is troublesome to modify the design indicators. Modifying the design indicators within a certain range does not require changing the electronic air pressure switch or chip design, thereby reducing the development cycle and development cost.

[0007] Based on the above-mentioned purpose, the present invention provides a method for setting the air pressure threshold of an electronic air pressure switch, a switch, and an electronic device. This method is divided into three parts: the first part is to design a personalized capacitance change threshold acquisition circuit in the chip, the function of which is to obtain the personalized capacitance change threshold required by the electronic air pressure switch and store it in the personalized capacitance change threshold storage circuit; the second part requires the production and testing equipment of the electronic air pressure switch to cooperate with the chip to load a target air pressure to the electronic air pressure switch at a specific time according to the process protocol during its production and testing process, and its value is equal to the target air pressure threshold; the third part is the process protocol, which is used to coordinate the acquisition action of the personalized capacitance change threshold acquisition circuit of the chip and the target air pressure loading action of the production and testing equipment.

[0008] Preferably, the personalized capacitance change threshold in the chip of each of the electronic air pressure switches is obtained and stored by a personalized capacitance change threshold module arranged inside the chip; the personalized capacitance change threshold module of the electronic air pressure switch chip obtains the equivalent capacitance value when the air pressure is not loaded before loading the target air pressure, and obtains the equivalent capacitance value when the air pressure is loaded when loading the target air pressure, and then calculates the difference between the two, and the difference is the personalized capacitance change threshold; different electronic air pressure switches trigger the execution operation when their personalized capacitance change thresholds are reached.

[0009] Production test equipment is not within the scope of the present invention, but production test equipment needs to work in accordance with the requirements of the process protocol.

[0010] Specifically, one of the purposes of the present invention is to provide a method for setting an air pressure threshold of an electronic air pressure switch, comprising:

[0011] Each electronic air pressure switch is provided with a personalized capacitance change threshold module for acquiring and storing the personalized capacitance change threshold of the electronic air pressure switch;

[0012] During the testing process of the production test equipment, each electronic pressure switch coordinates with the personalized capacitance change threshold module corresponding to the electronic pressure switch according to the process protocol to obtain the capacitance change value between the unloaded and loaded target air pressures to set the personalized capacitance change threshold within it; when different electronic pressure switches reach their personalized capacitance change thresholds, the execution operation is triggered.

[0013] Preferably, the process protocol is used to coordinate the loading action of the target air pressure of the production test equipment of the electronic air pressure switch, and coordinate the action of setting the personalized capacitance change threshold in each electronic air pressure switch by the personalized capacitance change threshold module.

[0014] Specifically, the process protocol coordinates the actions of the personalized capacitance change threshold acquisition circuit and the production test equipment by acquiring control signals. More specifically, the acquisition control signal tells the personalized capacitance change threshold acquisition circuit when to acquire the equivalent capacitance value without loading the target air pressure, and when to acquire the equivalent capacitance value with loading the target air pressure. The time points must be consistent with the time points when the production test equipment loads the target air pressure.

[0015] Preferably, the electronic pneumatic pressure switch also has a timing function. According to the process protocol, the timing function is used to send an acquisition control signal to the personalized capacitance change threshold module after the electronic pneumatic pressure switch is powered on for the first time.

[0016] Preferably, according to the process protocol, the production test equipment of the electronic pneumatic switch sends an acquisition control signal to each electronic pneumatic switch through an input pin of the chip of the electronic pneumatic switch.

[0017] Specifically, the present invention shows two specific implementation schemes for obtaining the control signal, one is to generate it using an internal first power-on timing circuit, and the other is to let the test production equipment provide the signal.

[0018] Preferably, the protocol of the internal first power-on timing circuit scheme is as follows: when the production test equipment starts the test, it first powers on the electronic air pressure switch to be tested, then waits for T1 time, and then loads the target air pressure to the electronic air pressure switch to be tested, and then maintains the T2 time length; after completing the power-on and power-on reset but before the end of T1, the first power-on timing circuit first tells the personalized capacitance change threshold acquisition circuit to obtain the equivalent capacitance value without loading the target air pressure through the acquisition control signal; then before the end of T2, it tells the personalized capacitance change threshold acquisition circuit to obtain the equivalent capacitance value when the target air pressure is loaded; calculate the difference between the two and store the personalized capacitance change threshold.

[0019] Preferably, a binary flag signal is added to the chip in each electronic air pressure switch to determine whether the personalized capacitance change threshold has been successfully written into the personalized capacitance change threshold.

[0020] Preferably, if the flag signal indicates that the personalized capacitance change threshold value has not been successfully written, the first power-on timing circuit scheme will be repeated at the next power-on, that is, the next power-on is still considered to be the first power-on until the flag signal indicates that it has been successfully written.

[0021] Preferably, the solution of having the test production equipment provide the signal requires that the acquisition control signal be led to the outside of the electronic air pressure switch and connected to the production test equipment, and the production test equipment tells the personalized capacitance change threshold acquisition circuit when to obtain the equivalent capacitance values ​​of the loaded and unloaded target air pressures.

[0022] Preferably, the personalized capacitance change threshold module acquires and stores the personalized capacitance change threshold including the following steps:

[0023] S1: After the personalized capacitance change threshold module receives the acquisition control signal, the personalized capacitance change threshold module acquires and records the equivalent capacitance value of the electronic air pressure switch when no air pressure is loaded within T1 time;

[0024] S2: Then the production test equipment loads the target air pressure to each electronic air pressure switch, and the personalized capacitance change threshold module records the equivalent capacitance value of the electronic air pressure switch when the target air pressure is loaded within time T2;

[0025] S3: Calculate the difference between the equivalent capacitance value when the target air pressure is loaded in step S2 and the equivalent capacitance value when the target air pressure is not loaded in step S1, and use the difference as the personalized capacitance change threshold private to each electronic air pressure switch.

[0026] The second purpose of the present invention is to provide an electronic air pressure switch, comprising: a battery, an air pressure sensor and a chip, wherein the chip is provided with a personalized capacitance change threshold module for acquiring and storing the personalized capacitance change threshold of the electronic air pressure switch, a capacitance monitoring circuit, a power switch and a control circuit, wherein the personalized capacitance change threshold module comprises a personalized capacitance change threshold acquisition circuit and a storage circuit, and the capacitance change of the air pressure sensor is monitored by the capacitance monitoring circuit to obtain a real-time capacitance change value, and by comparing the real-time signal change value and the personalized capacitance change threshold, it is determined whether to trigger the execution of the operation by configuring the power switch.

[0027] Preferably, a timing circuit is also provided inside the chip of the electronic air pressure switch, for sending an acquisition control signal to the personalized capacitance change threshold acquisition circuit after the electronic air pressure switch is powered on for the first time.

[0028] The third object of the present invention is to provide an electronic device, wherein the power switch of the electronic air pressure switch is electrically connected to the execution component, and when the external air pressure reaches the target air pressure, the execution component is triggered to work.

[0029] Preferably, the actuator is a heating resistance wire.

[0030] A fourth object of the present invention is to provide a method for using an electronic device, the method comprising the following steps:

[0031] S1: The capacitance monitoring circuit monitors the capacitance change of the air pressure sensor in real time to obtain a real-time capacitance change value; and sends the real-time capacitance change value to the control circuit;

[0032] S2: the control circuit calls the personalized capacitance change threshold stored in the personalized capacitance change threshold storage circuit;

[0033] S3: The control circuit determines whether the real-time capacitance change value reaches the personalized capacitance change threshold value, and if so, sends an on signal to the power switch; otherwise, does not send an on signal;

[0034] S4: After the power switch obtains the start-up signal, the power switch is turned on, and the execution component starts to work accordingly.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] 1. The chip in the electronic air pressure switch of the present invention does not use a fixed capacitance change threshold, but stores the capacitance change threshold required by each individual electronic air pressure switch to reach the target air pressure threshold in the personalized capacitance change threshold storage circuit of the chip. The present invention designs a personalized capacitance change threshold acquisition circuit in the chip, the function of which is to obtain the capacitance change threshold required by the electronic air pressure switch and store it in the personalized capacitance change threshold storage circuit; then, a link is added before the production test process of the electronic air pressure switch, that is, to load a target air pressure to the electronic air pressure switch, and its value is equal to the target The air pressure threshold is the change in equivalent capacitance obtained by the electronic air pressure switch chip at this time compared with when no air pressure is loaded. Its value is also the personalized capacitance change threshold; this ensures high consistency of the air pressure threshold during large-scale mass production of electronic air pressure switches; since the capacitance change threshold in each electronic air pressure switch is set according to the capacitance change of each electronic air pressure switch at the target air pressure, the action is triggered when the air pressure is higher than this value. As long as the air pressure loaded in the production process is accurate and the accuracy and resolution of the personalized capacitance change threshold acquisition circuit are designed to be high enough, the accuracy of the air pressure threshold is also very high, and it is easy to achieve within 10 Pa.

[0037] 2. In the present invention, it is very easy to modify the air pressure threshold. Since the target air pressure loaded in the solution does not have a specific value, when a different target air pressure is loaded, the corresponding capacitance change will be stored in the personalized capacitance change threshold storage circuit, and the air pressure threshold will also change accordingly. There is no need to make any modifications to the air pressure sensor or chip. If the target air pressure loaded in the production process is 150 Pa, the air pressure threshold of the electronic air pressure switch will be 150 Pa. If 180 Pa is loaded, the air pressure threshold of the electronic air pressure switch will automatically be 180 Pa.

[0038] In summary, the present invention does not need to perform quality inspection on the trigger pressure value of the electronic air pressure switch. It only needs to configure a personalized capacitance change threshold for each electronic air pressure switch after production is completed. The obtained products are all good products except for defective products, which greatly improves the yield rate. At the same time, the user experience is improved, and the product development time and development cost related to the user's modification of the target air pressure threshold can be saved. There are also other beneficial effects, such as no longer relying on the parasitic capacitance of the circuit board. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 is a circuit diagram of Embodiment 1;

[0040] Figure 2 A schematic diagram of a circuit corresponding to sending a control signal to an acquisition circuit when power is first turned on in Embodiment 1;

[0041] Figure 3 This is a circuit diagram corresponding to the production test equipment sending a control signal to the acquisition circuit through the chip pin in Example 1;

[0042] Figure 4 A flowchart for setting a personalized capacitance change threshold for the production test equipment and the electronic air pressure switch in Example 1;

[0043] Figure 5 This is a schematic diagram of the overall structure of the connection between the electronic air pressure switch and the actuator in Example 2;

[0044] Figure 6 This is a circuit diagram of the electronic device in Embodiment 3 in which the actuator is a heating resistor wire;

[0045] Figure 7 This is a flow chart of a method for using an electronic device in Embodiment 4.

[0046] In the figure: 100, battery; 200, air pressure sensor; 300, chip; 400, execution unit; 301, capacitance monitoring circuit; 302, personalized capacitance change threshold storage circuit; 304, personalized capacitance change threshold acquisition circuit; 305, power switch; 306, control circuit; 307, timing circuit. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0049] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0050] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments.

[0051] Embodiment 1:

[0052] like Figure 1-5 As shown, a method for setting a pressure threshold of an electronic pressure switch, a switch, and an electronic device, the method comprising:

[0053] Each electronic air pressure switch is provided with a personalized capacitance change threshold module for acquiring and storing the personalized capacitance change threshold of the electronic air pressure switch;

[0054] During the testing process of the production test equipment, each electronic pressure switch coordinates with the personalized capacitance change threshold module corresponding to the electronic pressure switch according to the process protocol to obtain the capacitance change value between the unloaded and loaded target air pressures to set the personalized capacitance change threshold within it; when different electronic pressure switches reach their personalized capacitance change thresholds, the execution operation is triggered.

[0055] The process protocol is used to coordinate the loading action of the target air pressure of the production test equipment of the electronic air pressure switch, and coordinate the personalized capacitance change threshold module to set the personalized capacitance change threshold in each electronic air pressure switch.

[0056] It should be noted that the present embodiment specifically includes three parts; the first part is to design a personalized capacitance change threshold module in the chip 300, the personalized capacitance change threshold module includes a personalized capacitance change threshold acquisition circuit 304 and a personalized capacitance change threshold storage circuit 302, the function of the module is to use the personalized capacitance change threshold acquisition circuit 304 to obtain the personalized capacitance change threshold required by the electronic air pressure switch and store it in the personalized capacitance change threshold storage circuit 302; Figure 4 As shown, Figure 4 This is a coordination flow chart for setting a personalized capacitance change threshold for the production test equipment and the electronic pressure switch in Example 1. The second part requires the production test equipment of the electronic pressure switch to cooperate with the chip 300, and load a target air pressure equal to the target air pressure threshold to the electronic pressure switch at a specific time during its production test according to the process protocol; the third part is the process protocol, which is used to coordinate the acquisition action of the personalized capacitance change threshold acquisition circuit 304 of the chip 300 and the target air pressure loading action of the production test equipment.

[0057] Furthermore, after receiving the acquisition control signal, the personalized capacitance change threshold module completes acquisition of the capacitance change value between the unloaded and loaded target air pressures according to the process protocol to set the personalized capacitance change threshold.

[0058] It should be noted that the personalized capacitance change threshold acquisition circuit 304 may acquire the control signal in the following ways, such as using the internal first power-on timing circuit 307 to generate the signal, or allowing the test production equipment to provide the signal.

[0059] As a preferred embodiment:

[0060] like Figure 2As shown, according to the process protocol, the production test equipment of the electronic pressure switch sends an acquisition control signal to each electronic pressure switch through an input pin of the chip of the electronic pressure switch. Specifically, the protocol of the internal first power-on timing circuit 307 scheme is as follows: the production test equipment first powers on the electronic pressure switch to be tested when starting the test, then waits for T1 time, and then loads the target pressure to the electronic pressure switch to be tested, and then maintains the T2 time length. After completing the power-on and power-on reset but before the end of T1, the first power-on timing circuit 307 first tells the personalized capacitance change threshold acquisition circuit 304 to obtain the equivalent capacitance value without loading the target pressure through the acquisition control signal; then before the end of T2, tell the personalized capacitance change threshold acquisition circuit 304 to obtain the equivalent capacitance value when loading the target pressure; calculate the difference between the two as the personalized capacitance change threshold, and store it in the personalized capacitance change threshold storage circuit 302.

[0061] Preferably, a binary flag signal for judging whether the personalized capacitance change threshold value has been successfully written into the personalized capacitance change threshold value is added in the chip 300 in each electronic air pressure switch.

[0062] Preferably, if the flag signal indicates that the personalized capacitance change threshold value has not been successfully written, the first power-on timing circuit 307 scheme will be repeated at the next power-on, that is, the next power-on is still considered as the first power-on, until the flag signal indicates that the writing has been successful.

[0063] As another preferred embodiment:

[0064] like Figure 3 As shown, the electronic air pressure switch also has a timing function. According to the process protocol, the timing function is used to send an acquisition control signal to the personalized capacitance change threshold module after the electronic air pressure switch is powered on for the first time.

[0065] In addition, the personalized capacitance change threshold module acquires and stores the personalized capacitance change threshold, including the following steps:

[0066] S1: After the personalized capacitance change threshold module receives the acquisition control signal, the module acquires and records the equivalent capacitance value of the electronic air pressure switch when no air pressure is loaded within time T1;

[0067] S2: Then, the target air pressure is loaded to each electronic air pressure switch, and the personalized capacitance change threshold module records the equivalent capacitance value when the electronic air pressure switch is loaded with the target air pressure within time T2;

[0068] S3: Calculate the difference between the equivalent capacitance value when the air pressure is applied in step S2 and the equivalent capacitance value when the air pressure is not applied in step S1, and use the difference as the personalized capacitance change threshold private to each electronic air pressure switch.

[0069] Specifically, there is no timing circuit 307 inside the chip 300, and it is impossible to send a control signal to the personalized capacitance change threshold acquisition circuit 304 when it is powered on for the first time. At this time, according to the provisions of the process protocol, the production test equipment can provide the control signal. This solution requires that the acquisition control signal be led to the outside of the electronic air pressure switch and connected to the production test equipment. The production test equipment tells the personalized capacitance change threshold acquisition circuit 304 when to obtain the equivalent capacitance value of the loaded and unloaded target air pressure. The specific production test equipment sends a signal to the personalized capacitance change threshold acquisition circuit 304 through a pin of the chip 300 after the chip 300 is powered on. The specific work is as follows: after the production test equipment powers on the electronic air pressure switch, it first waits for T1 time, and before the end of T1 time, sends an acquisition control signal to the personalized capacitance change threshold acquisition circuit 304 through the pin to obtain the equivalent capacitance value without loading the target air pressure; then the production test equipment loads the target air pressure to the electronic air pressure switch and maintains it for T2 time, and before the end of T2 time, sends an acquisition control signal to the personalized capacitance change threshold acquisition circuit 304 through the pin to obtain the equivalent capacitance value loaded with the target air pressure; calculate the difference between the two as the personalized capacitance change threshold, and store it in the personalized capacitance change threshold storage circuit 302.

[0070] After the personalized capacitance change threshold acquisition circuit 304 obtains the control signal, it also waits for T1 time, then loads the target air pressure to the electronic air pressure switch to be tested, and then maintains the T2 time length. Before the end of T1, the personalized capacitance change threshold acquisition circuit 304 is told to obtain the equivalent capacitance value without loading the target air pressure through the obtained control signal; then before the end of T2, the personalized capacitance change threshold acquisition circuit 304 is told to obtain the equivalent capacitance value when the target air pressure is loaded; the difference between the two is calculated as the personalized capacitance change threshold, and it is stored in the personalized capacitance change threshold storage circuit 302.

[0071] It should be noted that compared with the prior art, for example, in the prior art, if the target air pressure threshold is 150 Pa, the chip 300 generally has a fixed capacitance change threshold, such as 3%, and 3% is actually 1 / 32. It is necessary to design the equivalent capacitor as the pressure sensor 200 so that when the air pressure is loaded from no pressure to 150 Pa, the capacitance change is greater than 1 / 32, which triggers the execution operation. However, due to individual differences in the pressure sensors 200, some require a pressure greater than 150 Pa to load, and their capacitance change reaches 1 / 32, while some reach 1 / 32 when the pressure is less than 150 Pa, resulting in poor product consistency. By using the method of the present invention, as long as the external air pressure reaches 150 Pa, the capacitance change of the equivalent capacitor as the pressure sensor 200 just reaches its private personalized capacitance change threshold, and then the chip 300 completes the trigger execution operation, so the product consistency is very high.

[0072] It is worth mentioning that in the present invention, the consistency of the air pressure threshold is high when the electronic air pressure switch is mass-produced; since the capacitance change threshold in each electronic air pressure switch is set according to the capacitance change of each electronic air pressure switch at the target air pressure, the execution action is triggered when the air pressure is higher than this value. As long as the air pressure loaded in the production link is accurate and the precision and resolution of the personalized capacitance change threshold acquisition circuit 304 are designed to be high enough, the accuracy of the air pressure threshold is also very high, and it is easy to achieve within 10 Pa; the present invention does not need to perform quality inspection on the triggering air pressure value of the electronic air pressure switch. It only needs to configure a personalized capacitance change threshold for each electronic air pressure switch after production is completed. The obtained products are all good products except for defective products, which greatly improves the yield rate. At the same time, the user experience is improved.

[0073] It is worth mentioning that in the present invention, it is very easy to modify the air pressure threshold. Since the target air pressure loaded in the solution does not have a specific value, when a different target air pressure is loaded, the corresponding capacitance change will be stored in the personalized capacitance change threshold, and the air pressure threshold will also be changed accordingly, without making any modifications to the air pressure sensor 200 or the chip 300. Using the previous example again, if the target air pressure loaded in the production process is 150 Pa, the air pressure threshold of the electronic air pressure switch is 150 Pa. If 180 Pa is loaded, the air pressure threshold of the electronic air pressure switch will automatically be 180 Pa.

[0074] Embodiment 2:

[0075] like Figure 5As shown, this embodiment discloses an electronic air pressure switch, including: a battery 100, an air pressure sensor 200 and a chip 300. The chip 300 is provided with a personalized capacitance change threshold module for acquiring and storing the personalized capacitance change threshold of the electronic air pressure switch, a capacitance monitoring circuit 301, a power switch 305 and a control circuit 306. The personalized capacitance change threshold module includes a personalized capacitance change threshold acquisition circuit 304 and a personalized capacitance change threshold storage circuit 302. The capacitance change of the air pressure sensor 200 is monitored by the capacitance monitoring circuit 301 to obtain a real-time capacitance change value. By comparing the real-time signal change value and the personalized capacitance change threshold, it is determined whether to trigger the execution operation by configuring the power switch 305.

[0076] Preferably, a timing circuit 307 is further provided inside the chip 300 of the electronic air pressure switch, for sending an acquisition control signal to the personalized capacitance change threshold acquisition circuit 304 after the electronic air pressure switch is powered on for the first time.

[0077] It should be noted that the first end of the capacitance monitoring circuit 301 is connected to the equivalent capacitance of the air pressure sensor 200 outside the chip 300 to monitor the value of the equivalent capacitance, and the second end is the output, which is connected to the control circuit 306 and the personalized capacitance change threshold acquisition circuit 304 in the chip 300; the commonly used capacitance monitoring circuit 301 adopts an oscillation circuit, and its output is a frequency signal, and its frequency will change with the change of the input capacitance value; different output values ​​of the capacitance monitoring circuit 301 correspond to different values ​​of the equivalent capacitance it monitors. Since the equivalent capacitance corresponds to the air pressure value loaded by the electronic air pressure switch, the output of the capacitance monitoring circuit 301 corresponds to the air pressure value loaded by the electronic air pressure switch.

[0078] It should be added that, as a preferred embodiment, since the equivalent capacitance change threshold is written during production testing, the personalized capacitance change threshold storage circuit 302 needs to adopt a non-volatile storage circuit, such as a one-time programmable memory OTP (one time programmable), a multiple-time programmable memory MTP (multi-time programmable), an electronic fuse memory eFuse or a flash memory storage circuit; the input end of the personalized capacitance change threshold storage circuit 302 is connected to the output end of the personalized capacitance change threshold acquisition circuit 304, and the output end of the personalized capacitance change threshold storage circuit 302 is connected to the control circuit 306.

[0079] It should be added that, for example, when OTP or eFuse is used as the personalized capacitance change threshold storage circuit 302, the personalized capacitance change threshold is only written once during production. When MTP is used, the personalized capacitance change threshold stored internally in the personalized capacitance change threshold storage circuit 302 can be deleted and a new personalized capacitance change threshold can be rewritten.

[0080] Embodiment three:

[0081] like Figure 6 As shown, this embodiment discloses an electronic device, in which the power switch 305 of the electronic air pressure switch is electrically connected to the execution component 400, and when the external air pressure reaches the air pressure threshold, the execution component 400 is triggered to work.

[0082] Preferably, the actuator 400 is a heating resistance wire.

[0083] It should be noted that in actual use, for example, the execution component 400 can be a heating resistor wire, which is specifically connected in series with the power switch 305. When the external air pressure reaches the air pressure threshold, the heating resistor wire is triggered to start heating. One end of the battery 100 is grounded, and the other end supplies power to the chip 300 and the heating resistor wire serving as the execution component 400.

[0084] Embodiment 4:

[0085] like Figure 7 As shown, this embodiment discloses a method for using an electronic device, and the method specifically includes the following steps:

[0086] S1: The capacitance monitoring circuit 301 monitors the capacitance change of the air pressure sensor 200 in real time to obtain a real-time capacitance change value; and sends the real-time capacitance change value to the control circuit 306;

[0087] S2: the control circuit 306 calls the personalized capacitance change threshold stored in the personalized capacitance change threshold storage circuit 302;

[0088] S3: The control circuit 306 determines whether the real-time capacitance change value reaches the personalized capacitance change threshold value, and if so, sends an opening signal to the power switch 305; otherwise, no opening signal is sent;

[0089] S4: After the power switch 305 obtains the start signal, the power switch 305 is turned on, and the execution component 400 works accordingly.

[0090] In this embodiment, the control circuit 306 has two input signals, which come from the capacitance monitoring circuit 301 and the personalized capacitance change threshold storage circuit 302 respectively. When the control circuit 306 detects that the equivalent capacitance value changes exceeding the personalized capacitance change threshold, it outputs a signal to drive the power switch 305, thereby driving the execution component 400 to work.

[0091] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for setting an air pressure threshold of an electronic air pressure switch, characterized in that: The method comprises: Each electronic air pressure switch is provided with a personalized capacitance change threshold module for acquiring and storing the personalized capacitance change threshold of the electronic air pressure switch; During the test process of the production test equipment, each electronic air pressure switch coordinates with the personalized capacitance change threshold module corresponding to the electronic air pressure switch according to the process protocol to obtain the capacitance change value between not loaded and loaded with the target air pressure to set the personalized capacitance change threshold within it; when different electronic air pressure switches reach their personalized capacitance change thresholds, the execution operation is triggered; The personalized capacitance change threshold module acquires and stores the personalized capacitance change threshold, including the following steps: S1: After the personalized capacitance change threshold module receives the acquisition control signal, the module acquires and records the equivalent capacitance value of the electronic air pressure switch when no air pressure is loaded within time T1; S2: Then, the target air pressure is loaded to each electronic air pressure switch, and the personalized capacitance change threshold module records the equivalent capacitance value when the electronic air pressure switch is loaded with the target air pressure within time T2; S3: Calculate the difference between the equivalent capacitance value when the air pressure is applied in step S2 and the equivalent capacitance value when the air pressure is not applied in step S1, and use the difference as the personalized capacitance change threshold private to each electronic air pressure switch.

2. The air pressure threshold setting method according to claim 1, characterized in that: The process protocol is used to coordinate the loading action of the target air pressure of the production test equipment of the electronic air pressure switch, and coordinate the action of setting the personalized capacitance change threshold value in each electronic air pressure switch by the personalized capacitance change threshold value module.

3. The method for setting the air pressure threshold according to claim 2, characterized in that: After receiving the acquisition control signal, the personalized capacitance change threshold module completes acquisition of the capacitance change value between not loaded and loaded with the target air pressure according to the process protocol to set the personalized capacitance change threshold.

4. The method for setting the air pressure threshold according to claim 3, characterized in that: The electronic air pressure switch also has a timing function. According to the process protocol, the timing function is used to send an acquisition control signal to the personalized capacitance change threshold module after the electronic air pressure switch is powered on for the first time.

5. The method for setting the air pressure threshold according to claim 3, characterized in that: According to the process protocol, the production test equipment of the electronic pneumatic switch sends an acquisition control signal to each electronic pneumatic switch through an input pin of the chip of the electronic pneumatic switch.

6. An electronic air pressure switch comprising: A battery (100), an air pressure sensor (200) and a chip (300), characterized in that a personalized capacitance change threshold module for acquiring and storing a personalized capacitance change threshold of an electronic air pressure switch, a capacitance monitoring circuit (301), a power switch (305) and a control circuit (306) are provided inside the chip (300); the personalized capacitance change threshold module comprises a personalized capacitance change threshold acquisition circuit (304) and a personalized capacitance change threshold storage circuit (302); the capacitance change of the air pressure sensor (200) is monitored by the capacitance monitoring circuit (301) to obtain a real-time capacitance change value; and by comparing the real-time signal change value and the personalized capacitance change threshold, it is determined whether to trigger the execution of an operation by configuring the power switch (305); The personalized capacitance change threshold module acquires and stores the personalized capacitance change threshold, including the following steps: S1: After the personalized capacitance change threshold module receives the acquisition control signal, the module acquires and records the equivalent capacitance value of the electronic air pressure switch when no air pressure is loaded within time T1; S2: Then, the target air pressure is loaded to each electronic air pressure switch, and the personalized capacitance change threshold module records the equivalent capacitance value when the electronic air pressure switch is loaded with the target air pressure within time T2; S3: Calculate the difference between the equivalent capacitance value when the air pressure is applied in step S2 and the equivalent capacitance value when the air pressure is not applied in step S1, and use the difference as the personalized capacitance change threshold private to each electronic air pressure switch.

7. The electronic gas pressure switch according to claim 6, characterized in that: A timing circuit (307) is also provided inside the chip (300) of the electronic air pressure switch, which is used to send an acquisition control signal to the personalized capacitance change threshold acquisition circuit (304) after the electronic air pressure switch is powered on for the first time.

8. An electronic device, characterized in that: The electronic air pressure switch comprises the electronic air pressure switch as claimed in any one of claims 6 to 7, wherein the power switch (305) of the electronic air pressure switch is electrically connected to the actuator (400), and when the external air pressure reaches the target air pressure, the actuator (400) is triggered to operate.

9. The electronic device according to claim 8, wherein the execution component (400) is a heating resistance wire.

10. A method for using an electronic device, characterized in that: The electronic device is the electronic device described in claim 8 or 9, and the method of use specifically comprises the following steps: S1: the capacitance monitoring circuit (301) monitors the capacitance change of the air pressure sensor (200) in real time to obtain a real-time capacitance change value; and sends the real-time capacitance change value to the control circuit (306); S2: the control circuit (306) calls the personalized capacitance change threshold stored in the personalized capacitance change threshold storage circuit (302); S3: the control circuit (306) determines whether the real-time capacitance change value reaches the personalized capacitance change threshold value, and if so, sends an on signal to the power switch (305); otherwise, does not send an on signal; S4: After the power switch (305) obtains the start-up signal, the power switch (305) is turned on, and the execution component (400) starts to work accordingly.

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